includes/Parser.php

   1 <?php
   2
   3 /**
   4  *
   5  * File for Parser and related classes
   6  *
   7  * @addtogroup Parser
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are four main entry points into the Parser class:
  19  * parse()
  20  *   produces HTML output
  21  * preSaveTransform().
  22  *   produces altered wiki markup.
  23  * transformMsg()
  24  *   performs brace substitution on MediaWiki messages
  25  * preprocess()
  26  *   removes HTML comments and expands templates
  27  *
  28  * Globals used:
  29  *    objects:   $wgLang, $wgContLang
  30  *
  31  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  32  *
  33  * settings:
  34  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  35  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  36  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  37  *  $wgMaxArticleSize*
  38  *
  39  *  * only within ParserOptions
  40  * </pre>
  41  *
  42  * @addtogroup Parser
  43  */
  44 class Parser
  45 {
  46         /**
  47          * Update this version number when the ParserOutput format
  48          * changes in an incompatible way, so the parser cache
  49          * can automatically discard old data.
  50          */
  51         const VERSION = '1.6.2';
  52
  53         # Flags for Parser::setFunctionHook
  54         # Also available as global constants from Defines.php
  55         const SFH_NO_HASH = 1;
  56         const SFH_OBJECT_ARGS = 2;
  57
  58         # Constants needed for external link processing
  59         # Everything except bracket, space, or control characters
  60         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  61         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  62                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  63
  64         // State constants for the definition list colon extraction
  65         const COLON_STATE_TEXT = 0;
  66         const COLON_STATE_TAG = 1;
  67         const COLON_STATE_TAGSTART = 2;
  68         const COLON_STATE_CLOSETAG = 3;
  69         const COLON_STATE_TAGSLASH = 4;
  70         const COLON_STATE_COMMENT = 5;
  71         const COLON_STATE_COMMENTDASH = 6;
  72         const COLON_STATE_COMMENTDASHDASH = 7;
  73
  74         /**#@+
  75          * @private
  76          */
  77         # Persistent:
  78         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  79                 $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerSuffix,
  80                 $mExtLinkBracketedRegex;
  81
  82         # Cleared with clearState():
  83         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
  84         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
  85         var $mInterwikiLinkHolders, $mLinkHolders;
  86         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
  87         var $mTplExpandCache,// empty-frame expansion cache
  88             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
  89                                 // in this path. Used for loop detection.
  90         var $mTplRedirCache, $mTplDomCache, $mHeadings;
  91
  92         # Temporary
  93         # These are variables reset at least once per parse regardless of $clearState
  94         var $mOptions,      // ParserOptions object
  95                 $mTitle,        // Title context, used for self-link rendering and similar things
  96                 $mOutputType,   // Output type, one of the OT_xxx constants
  97                 $ot,            // Shortcut alias, see setOutputType()
  98                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
  99                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 100                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 101
 102         /**#@-*/
 103
 104         /**
 105          * Constructor
 106          *
 107          * @public
 108          */
 109         function __construct( $conf = array() ) {
 110                 $this->mTagHooks = array();
 111                 $this->mTransparentTagHooks = array();
 112                 $this->mFunctionHooks = array();
 113                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 114                 $this->mStripList = array( 'nowiki', 'gallery' );
 115                 $this->mMarkerSuffix = "-QINU\x7f";
 116                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 117                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 118                 $this->mFirstCall = true;
 119         }
 120
 121         /**
 122          * Do various kinds of initialisation on the first call of the parser
 123          */
 124         function firstCallInit() {
 125                 if ( !$this->mFirstCall ) {
 126                         return;
 127                 }
 128
 129                 wfProfileIn( __METHOD__ );
 130                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
 131
 132                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 133
 134                 # Syntax for arguments (see self::setFunctionHook):
 135                 #  "name for lookup in localized magic words array",
 136                 #  function callback,
 137                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}
 138                 #    instead of {{#int:...}})
 139                 $this->setFunctionHook( 'int',              array( 'CoreParserFunctions', 'intFunction'      ), SFH_NO_HASH );
 140                 $this->setFunctionHook( 'ns',               array( 'CoreParserFunctions', 'ns'               ), SFH_NO_HASH );
 141                 $this->setFunctionHook( 'urlencode',        array( 'CoreParserFunctions', 'urlencode'        ), SFH_NO_HASH );
 142                 $this->setFunctionHook( 'lcfirst',          array( 'CoreParserFunctions', 'lcfirst'          ), SFH_NO_HASH );
 143                 $this->setFunctionHook( 'ucfirst',          array( 'CoreParserFunctions', 'ucfirst'          ), SFH_NO_HASH );
 144                 $this->setFunctionHook( 'lc',               array( 'CoreParserFunctions', 'lc'               ), SFH_NO_HASH );
 145                 $this->setFunctionHook( 'uc',               array( 'CoreParserFunctions', 'uc'               ), SFH_NO_HASH );
 146                 $this->setFunctionHook( 'localurl',         array( 'CoreParserFunctions', 'localurl'         ), SFH_NO_HASH );
 147                 $this->setFunctionHook( 'localurle',        array( 'CoreParserFunctions', 'localurle'        ), SFH_NO_HASH );
 148                 $this->setFunctionHook( 'fullurl',          array( 'CoreParserFunctions', 'fullurl'          ), SFH_NO_HASH );
 149                 $this->setFunctionHook( 'fullurle',         array( 'CoreParserFunctions', 'fullurle'         ), SFH_NO_HASH );
 150                 $this->setFunctionHook( 'formatnum',        array( 'CoreParserFunctions', 'formatnum'        ), SFH_NO_HASH );
 151                 $this->setFunctionHook( 'grammar',          array( 'CoreParserFunctions', 'grammar'          ), SFH_NO_HASH );
 152                 $this->setFunctionHook( 'plural',           array( 'CoreParserFunctions', 'plural'           ), SFH_NO_HASH );
 153                 $this->setFunctionHook( 'numberofpages',    array( 'CoreParserFunctions', 'numberofpages'    ), SFH_NO_HASH );
 154                 $this->setFunctionHook( 'numberofusers',    array( 'CoreParserFunctions', 'numberofusers'    ), SFH_NO_HASH );
 155                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 156                 $this->setFunctionHook( 'numberoffiles',    array( 'CoreParserFunctions', 'numberoffiles'    ), SFH_NO_HASH );
 157                 $this->setFunctionHook( 'numberofadmins',   array( 'CoreParserFunctions', 'numberofadmins'   ), SFH_NO_HASH );
 158                 $this->setFunctionHook( 'numberofedits',    array( 'CoreParserFunctions', 'numberofedits'    ), SFH_NO_HASH );
 159                 $this->setFunctionHook( 'language',         array( 'CoreParserFunctions', 'language'         ), SFH_NO_HASH );
 160                 $this->setFunctionHook( 'padleft',          array( 'CoreParserFunctions', 'padleft'          ), SFH_NO_HASH );
 161                 $this->setFunctionHook( 'padright',         array( 'CoreParserFunctions', 'padright'         ), SFH_NO_HASH );
 162                 $this->setFunctionHook( 'anchorencode',     array( 'CoreParserFunctions', 'anchorencode'     ), SFH_NO_HASH );
 163                 $this->setFunctionHook( 'special',          array( 'CoreParserFunctions', 'special'          ) );
 164                 $this->setFunctionHook( 'defaultsort',      array( 'CoreParserFunctions', 'defaultsort'      ), SFH_NO_HASH );
 165                 $this->setFunctionHook( 'filepath',         array( 'CoreParserFunctions', 'filepath'         ), SFH_NO_HASH );
 166
 167                 if ( $wgAllowDisplayTitle ) {
 168                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 169                 }
 170                 if ( $wgAllowSlowParserFunctions ) {
 171                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 172                 }
 173
 174                 $this->initialiseVariables();
 175                 $this->mFirstCall = false;
 176                 wfProfileOut( __METHOD__ );
 177         }
 178
 179         /**
 180          * Clear Parser state
 181          *
 182          * @private
 183          */
 184         function clearState() {
 185                 wfProfileIn( __METHOD__ );
 186                 if ( $this->mFirstCall ) {
 187                         $this->firstCallInit();
 188                 }
 189                 $this->mOutput = new ParserOutput;
 190                 $this->mAutonumber = 0;
 191                 $this->mLastSection = '';
 192                 $this->mDTopen = false;
 193                 $this->mIncludeCount = array();
 194                 $this->mStripState = new StripState;
 195                 $this->mArgStack = false;
 196                 $this->mInPre = false;
 197                 $this->mInterwikiLinkHolders = array(
 198                         'texts' => array(),
 199                         'titles' => array()
 200                 );
 201                 $this->mLinkHolders = array(
 202                         'namespaces' => array(),
 203                         'dbkeys' => array(),
 204                         'queries' => array(),
 205                         'texts' => array(),
 206                         'titles' => array()
 207                 );
 208                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 209
 210                 /**
 211                  * Prefix for temporary replacement strings for the multipass parser.
 212                  * \x07 should never appear in input as it's disallowed in XML.
 213                  * Using it at the front also gives us a little extra robustness
 214                  * since it shouldn't match when butted up against identifier-like
 215                  * string constructs.
 216                  *
 217                  * Must not consist of all title characters, or else it will change
 218                  * the behaviour of <nowiki> in a link.
 219                  */
 220                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 221                 $this->mUniqPrefix = "\x7fUNIQ" . Parser::getRandomString();
 222
 223                 # Clear these on every parse, bug 4549
 224                 $this->mTemplatePath = array();
 225                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 226
 227                 $this->mShowToc = true;
 228                 $this->mForceTocPosition = false;
 229                 $this->mIncludeSizes = array(
 230                         'post-expand' => 0,
 231                         'arg' => 0,
 232                 );
 233                 $this->mPPNodeCount = 0;
 234                 $this->mDefaultSort = false;
 235                 $this->mHeadings = array();
 236
 237                 wfRunHooks( 'ParserClearState', array( &$this ) );
 238                 wfProfileOut( __METHOD__ );
 239         }
 240
 241         function setOutputType( $ot ) {
 242                 $this->mOutputType = $ot;
 243                 // Shortcut alias
 244                 $this->ot = array(
 245                         'html' => $ot == OT_HTML,
 246                         'wiki' => $ot == OT_WIKI,
 247                         'msg' => $ot == OT_MSG,
 248                         'pre' => $ot == OT_PREPROCESS,
 249                 );
 250         }
 251
 252         /**
 253          * Accessor for mUniqPrefix.
 254          *
 255          * @public
 256          */
 257         function uniqPrefix() {
 258                 return $this->mUniqPrefix;
 259         }
 260
 261         /**
 262          * Convert wikitext to HTML
 263          * Do not call this function recursively.
 264          *
 265          * @param string $text Text we want to parse
 266          * @param Title &$title A title object
 267          * @param array $options
 268          * @param boolean $linestart
 269          * @param boolean $clearState
 270          * @param int $revid number to pass in {{REVISIONID}}
 271          * @return ParserOutput a ParserOutput
 272          */
 273         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 274                 /**
 275                  * First pass--just handle <nowiki> sections, pass the rest off
 276                  * to internalParse() which does all the real work.
 277                  */
 278
 279                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 280                 $fname = 'Parser::parse-' . wfGetCaller();
 281                 wfProfileIn( __METHOD__ );
 282                 wfProfileIn( $fname );
 283
 284                 if ( $clearState ) {
 285                         $this->clearState();
 286                 }
 287
 288                 $this->mOptions = $options;
 289                 $this->mTitle =& $title;
 290                 $oldRevisionId = $this->mRevisionId;
 291                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 292                 if( $revid !== null ) {
 293                         $this->mRevisionId = $revid;
 294                         $this->mRevisionTimestamp = null;
 295                 }
 296                 $this->setOutputType( OT_HTML );
 297                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 298                 # No more strip!
 299                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 300                 $text = $this->internalParse( $text );
 301                 $text = $this->mStripState->unstripGeneral( $text );
 302
 303                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 304                 $fixtags = array(
 305                         # french spaces, last one Guillemet-left
 306                         # only if there is something before the space
 307                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 308                         # french spaces, Guillemet-right
 309                         '/(\\302\\253) /' => '\\1&nbsp;',
 310                 );
 311                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 312
 313                 # only once and last
 314                 $text = $this->doBlockLevels( $text, $linestart );
 315
 316                 $this->replaceLinkHolders( $text );
 317
 318                 # the position of the parserConvert() call should not be changed. it
 319                 # assumes that the links are all replaced and the only thing left
 320                 # is the <nowiki> mark.
 321                 # Side-effects: this calls $this->mOutput->setTitleText()
 322                 $text = $wgContLang->parserConvert( $text, $this );
 323
 324                 $text = $this->mStripState->unstripNoWiki( $text );
 325
 326                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 327
 328 //!JF Move to its own function
 329
 330                 $uniq_prefix = $this->mUniqPrefix;
 331                 $matches = array();
 332                 $elements = array_keys( $this->mTransparentTagHooks );
 333                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 334
 335                 foreach( $matches as $marker => $data ) {
 336                         list( $element, $content, $params, $tag ) = $data;
 337                         $tagName = strtolower( $element );
 338                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 339                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 340                                         array( $content, $params, $this ) );
 341                         } else {
 342                                 $output = $tag;
 343                         }
 344                         $this->mStripState->general->setPair( $marker, $output );
 345                 }
 346                 $text = $this->mStripState->unstripGeneral( $text );
 347
 348                 $text = Sanitizer::normalizeCharReferences( $text );
 349
 350                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 351                         $text = Parser::tidy($text);
 352                 } else {
 353                         # attempt to sanitize at least some nesting problems
 354                         # (bug #2702 and quite a few others)
 355                         $tidyregs = array(
 356                                 # ''Something [http://www.cool.com cool''] -->
 357                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 358                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 359                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 360                                 # fix up an anchor inside another anchor, only
 361                                 # at least for a single single nested link (bug 3695)
 362                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 363                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 364                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 365                                 # contains a div, so fix it up here; replace
 366                                 # div with escaped text
 367                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 368                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 369                                 # remove empty italic or bold tag pairs, some
 370                                 # introduced by rules above
 371                                 '/<([bi])><\/\\1>/' => '',
 372                         );
 373
 374                         $text = preg_replace(
 375                                 array_keys( $tidyregs ),
 376                                 array_values( $tidyregs ),
 377                                 $text );
 378                 }
 379
 380                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 381
 382                 # Information on include size limits, for the benefit of users who try to skirt them
 383                 if ( $this->mOptions->getEnableLimitReport() ) {
 384                         $max = $this->mOptions->getMaxIncludeSize();
 385                         $limitReport =
 386                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 387                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 388                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n";
 389                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 390                         $text .= "\n<!-- \n$limitReport-->\n";
 391                 }
 392                 $this->mOutput->setText( $text );
 393                 $this->mRevisionId = $oldRevisionId;
 394                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 395                 wfProfileOut( $fname );
 396                 wfProfileOut( __METHOD__ );
 397
 398                 return $this->mOutput;
 399         }
 400
 401         /**
 402          * Recursive parser entry point that can be called from an extension tag
 403          * hook.
 404          */
 405         function recursiveTagParse( $text ) {
 406                 wfProfileIn( __METHOD__ );
 407                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 408                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 409                 $text = $this->internalParse( $text );
 410                 wfProfileOut( __METHOD__ );
 411                 return $text;
 412         }
 413
 414         /**
 415          * Expand templates and variables in the text, producing valid, static wikitext.
 416          * Also removes comments.
 417          */
 418         function preprocess( $text, $title, $options, $revid = null ) {
 419                 wfProfileIn( __METHOD__ );
 420                 $this->clearState();
 421                 $this->setOutputType( OT_PREPROCESS );
 422                 $this->mOptions = $options;
 423                 $this->mTitle = $title;
 424                 if( $revid !== null ) {
 425                         $this->mRevisionId = $revid;
 426                 }
 427                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 428                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 429                 $text = $this->replaceVariables( $text );
 430                 if ( $this->mOptions->getRemoveComments() ) {
 431                         $text = Sanitizer::removeHTMLcomments( $text );
 432                 }
 433                 $text = $this->mStripState->unstripBoth( $text );
 434                 wfProfileOut( __METHOD__ );
 435                 return $text;
 436         }
 437
 438         /**
 439          * Get a random string
 440          *
 441          * @private
 442          * @static
 443          */
 444         function getRandomString() {
 445                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 446         }
 447
 448         function &getTitle() { return $this->mTitle; }
 449         function getOptions() { return $this->mOptions; }
 450
 451         function getFunctionLang() {
 452                 global $wgLang, $wgContLang;
 453                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 454         }
 455
 456         /**
 457          * Replaces all occurrences of HTML-style comments and the given tags
 458          * in the text with a random marker and returns teh next text. The output
 459          * parameter $matches will be an associative array filled with data in
 460          * the form:
 461          *   'UNIQ-xxxxx' => array(
 462          *     'element',
 463          *     'tag content',
 464          *     array( 'param' => 'x' ),
 465          *     '<element param="x">tag content</element>' ) )
 466          *
 467          * @param $elements list of element names. Comments are always extracted.
 468          * @param $text Source text string.
 469          * @param $uniq_prefix
 470          *
 471          * @public
 472          * @static
 473          */
 474         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 475                 static $n = 1;
 476                 $stripped = '';
 477                 $matches = array();
 478
 479                 $taglist = implode( '|', $elements );
 480                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 481
 482                 while ( '' != $text ) {
 483                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 484                         $stripped .= $p[0];
 485                         if( count( $p ) < 5 ) {
 486                                 break;
 487                         }
 488                         if( count( $p ) > 5 ) {
 489                                 // comment
 490                                 $element    = $p[4];
 491                                 $attributes = '';
 492                                 $close      = '';
 493                                 $inside     = $p[5];
 494                         } else {
 495                                 // tag
 496                                 $element    = $p[1];
 497                                 $attributes = $p[2];
 498                                 $close      = $p[3];
 499                                 $inside     = $p[4];
 500                         }
 501
 502                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . $this->mMarkerSuffix;
 503                         $stripped .= $marker;
 504
 505                         if ( $close === '/>' ) {
 506                                 // Empty element tag, <tag />
 507                                 $content = null;
 508                                 $text = $inside;
 509                                 $tail = null;
 510                         } else {
 511                                 if( $element == '!--' ) {
 512                                         $end = '/(-->)/';
 513                                 } else {
 514                                         $end = "/(<\\/$element\\s*>)/i";
 515                                 }
 516                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 517                                 $content = $q[0];
 518                                 if( count( $q ) < 3 ) {
 519                                         # No end tag -- let it run out to the end of the text.
 520                                         $tail = '';
 521                                         $text = '';
 522                                 } else {
 523                                         $tail = $q[1];
 524                                         $text = $q[2];
 525                                 }
 526                         }
 527
 528                         $matches[$marker] = array( $element,
 529                                 $content,
 530                                 Sanitizer::decodeTagAttributes( $attributes ),
 531                                 "<$element$attributes$close$content$tail" );
 532                 }
 533                 return $stripped;
 534         }
 535
 536         /**
 537          * Get a list of strippable XML-like elements
 538          */
 539         function getStripList() {
 540                 global $wgRawHtml;
 541                 $elements = $this->mStripList;
 542                 if( $wgRawHtml ) {
 543                         $elements[] = 'html';
 544                 }
 545                 if( $this->mOptions->getUseTeX() ) {
 546                         $elements[] = 'math';
 547                 }
 548                 return $elements;
 549         }
 550
 551         /**
 552          * @deprecated use replaceVariables
 553          */
 554         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 555                 return $text;
 556         }
 557
 558         /**
 559          * Restores pre, math, and other extensions removed by strip()
 560          *
 561          * always call unstripNoWiki() after this one
 562          * @private
 563          * @deprecated use $this->mStripState->unstrip()
 564          */
 565         function unstrip( $text, $state ) {
 566                 return $state->unstripGeneral( $text );
 567         }
 568
 569         /**
 570          * Always call this after unstrip() to preserve the order
 571          *
 572          * @private
 573          * @deprecated use $this->mStripState->unstrip()
 574          */
 575         function unstripNoWiki( $text, $state ) {
 576                 return $state->unstripNoWiki( $text );
 577         }
 578
 579         /**
 580          * @deprecated use $this->mStripState->unstripBoth()
 581          */
 582         function unstripForHTML( $text ) {
 583                 return $this->mStripState->unstripBoth( $text );
 584         }
 585
 586         /**
 587          * Add an item to the strip state
 588          * Returns the unique tag which must be inserted into the stripped text
 589          * The tag will be replaced with the original text in unstrip()
 590          *
 591          * @private
 592          */
 593         function insertStripItem( $text ) {
 594                 static $n = 0;
 595                 $rnd = "{$this->mUniqPrefix}-item-$n-{$this->mMarkerSuffix}";
 596                 ++$n;
 597                 $this->mStripState->general->setPair( $rnd, $text );
 598                 return $rnd;
 599         }
 600
 601         /**
 602          * Interface with html tidy, used if $wgUseTidy = true.
 603          * If tidy isn't able to correct the markup, the original will be
 604          * returned in all its glory with a warning comment appended.
 605          *
 606          * Either the external tidy program or the in-process tidy extension
 607          * will be used depending on availability. Override the default
 608          * $wgTidyInternal setting to disable the internal if it's not working.
 609          *
 610          * @param string $text Hideous HTML input
 611          * @return string Corrected HTML output
 612          * @public
 613          * @static
 614          */
 615         function tidy( $text ) {
 616                 global $wgTidyInternal;
 617                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 618 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 619 '<head><title>test</title></head><body>'.$text.'</body></html>';
 620                 if( $wgTidyInternal ) {
 621                         $correctedtext = Parser::internalTidy( $wrappedtext );
 622                 } else {
 623                         $correctedtext = Parser::externalTidy( $wrappedtext );
 624                 }
 625                 if( is_null( $correctedtext ) ) {
 626                         wfDebug( "Tidy error detected!\n" );
 627                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 628                 }
 629                 return $correctedtext;
 630         }
 631
 632         /**
 633          * Spawn an external HTML tidy process and get corrected markup back from it.
 634          *
 635          * @private
 636          * @static
 637          */
 638         function externalTidy( $text ) {
 639                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 640                 $fname = 'Parser::externalTidy';
 641                 wfProfileIn( $fname );
 642
 643                 $cleansource = '';
 644                 $opts = ' -utf8';
 645
 646                 $descriptorspec = array(
 647                         0 => array('pipe', 'r'),
 648                         1 => array('pipe', 'w'),
 649                         2 => array('file', wfGetNull(), 'a')
 650                 );
 651                 $pipes = array();
 652                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 653                 if (is_resource($process)) {
 654                         // Theoretically, this style of communication could cause a deadlock
 655                         // here. If the stdout buffer fills up, then writes to stdin could
 656                         // block. This doesn't appear to happen with tidy, because tidy only
 657                         // writes to stdout after it's finished reading from stdin. Search
 658                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 659                         fwrite($pipes[0], $text);
 660                         fclose($pipes[0]);
 661                         while (!feof($pipes[1])) {
 662                                 $cleansource .= fgets($pipes[1], 1024);
 663                         }
 664                         fclose($pipes[1]);
 665                         proc_close($process);
 666                 }
 667
 668                 wfProfileOut( $fname );
 669
 670                 if( $cleansource == '' && $text != '') {
 671                         // Some kind of error happened, so we couldn't get the corrected text.
 672                         // Just give up; we'll use the source text and append a warning.
 673                         return null;
 674                 } else {
 675                         return $cleansource;
 676                 }
 677         }
 678
 679         /**
 680          * Use the HTML tidy PECL extension to use the tidy library in-process,
 681          * saving the overhead of spawning a new process.
 682          *
 683          * 'pear install tidy' should be able to compile the extension module.
 684          *
 685          * @private
 686          * @static
 687          */
 688         function internalTidy( $text ) {
 689                 global $wgTidyConf, $IP, $wgDebugTidy;
 690                 $fname = 'Parser::internalTidy';
 691                 wfProfileIn( $fname );
 692
 693                 $tidy = new tidy;
 694                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 695                 $tidy->cleanRepair();
 696                 if( $tidy->getStatus() == 2 ) {
 697                         // 2 is magic number for fatal error
 698                         // http://www.php.net/manual/en/function.tidy-get-status.php
 699                         $cleansource = null;
 700                 } else {
 701                         $cleansource = tidy_get_output( $tidy );
 702                 }
 703                 if ( $wgDebugTidy && $tidy->getStatus() > 0 ) {
 704                         $cleansource .= "<!--\nTidy reports:\n" .
 705                                 str_replace( '-->', '--&gt;', $tidy->errorBuffer ) .
 706                                 "\n-->";
 707                 }
 708
 709                 wfProfileOut( $fname );
 710                 return $cleansource;
 711         }
 712
 713         /**
 714          * parse the wiki syntax used to render tables
 715          *
 716          * @private
 717          */
 718         function doTableStuff ( $text ) {
 719                 $fname = 'Parser::doTableStuff';
 720                 wfProfileIn( $fname );
 721
 722                 $lines = explode ( "\n" , $text );
 723                 $td_history = array (); // Is currently a td tag open?
 724                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 725                 $tr_history = array (); // Is currently a tr tag open?
 726                 $tr_attributes = array (); // history of tr attributes
 727                 $has_opened_tr = array(); // Did this table open a <tr> element?
 728                 $indent_level = 0; // indent level of the table
 729                 foreach ( $lines as $key => $line )
 730                 {
 731                         $line = trim ( $line );
 732
 733                         if( $line == '' ) { // empty line, go to next line
 734                                 continue;
 735                         }
 736                         $first_character = $line{0};
 737                         $matches = array();
 738
 739                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 740                                 // First check if we are starting a new table
 741                                 $indent_level = strlen( $matches[1] );
 742
 743                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 744                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 745
 746                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 747                                 array_push ( $td_history , false );
 748                                 array_push ( $last_tag_history , '' );
 749                                 array_push ( $tr_history , false );
 750                                 array_push ( $tr_attributes , '' );
 751                                 array_push ( $has_opened_tr , false );
 752                         } else if ( count ( $td_history ) == 0 ) {
 753                                 // Don't do any of the following
 754                                 continue;
 755                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 756                                 // We are ending a table
 757                                 $line = '</table>' . substr ( $line , 2 );
 758                                 $last_tag = array_pop ( $last_tag_history );
 759
 760                                 if ( !array_pop ( $has_opened_tr ) ) {
 761                                         $line = "<tr><td></td></tr>{$line}";
 762                                 }
 763
 764                                 if ( array_pop ( $tr_history ) ) {
 765                                         $line = "</tr>{$line}";
 766                                 }
 767
 768                                 if ( array_pop ( $td_history ) ) {
 769                                         $line = "</{$last_tag}>{$line}";
 770                                 }
 771                                 array_pop ( $tr_attributes );
 772                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 773                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 774                                 // Now we have a table row
 775                                 $line = preg_replace( '#^\|-+#', '', $line );
 776
 777                                 // Whats after the tag is now only attributes
 778                                 $attributes = $this->mStripState->unstripBoth( $line );
 779                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 780                                 array_pop ( $tr_attributes );
 781                                 array_push ( $tr_attributes , $attributes );
 782
 783                                 $line = '';
 784                                 $last_tag = array_pop ( $last_tag_history );
 785                                 array_pop ( $has_opened_tr );
 786                                 array_push ( $has_opened_tr , true );
 787
 788                                 if ( array_pop ( $tr_history ) ) {
 789                                         $line = '</tr>';
 790                                 }
 791
 792                                 if ( array_pop ( $td_history ) ) {
 793                                         $line = "</{$last_tag}>{$line}";
 794                                 }
 795
 796                                 $lines[$key] = $line;
 797                                 array_push ( $tr_history , false );
 798                                 array_push ( $td_history , false );
 799                                 array_push ( $last_tag_history , '' );
 800                         }
 801                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 802                                 // This might be cell elements, td, th or captions
 803                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 804                                         $first_character = '+';
 805                                         $line = substr ( $line , 1 );
 806                                 }
 807
 808                                 $line = substr ( $line , 1 );
 809
 810                                 if ( $first_character == '!' ) {
 811                                         $line = str_replace ( '!!' , '||' , $line );
 812                                 }
 813
 814                                 // Split up multiple cells on the same line.
 815                                 // FIXME : This can result in improper nesting of tags processed
 816                                 // by earlier parser steps, but should avoid splitting up eg
 817                                 // attribute values containing literal "||".
 818                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 819
 820                                 $lines[$key] = '';
 821
 822                                 // Loop through each table cell
 823                                 foreach ( $cells as $cell )
 824                                 {
 825                                         $previous = '';
 826                                         if ( $first_character != '+' )
 827                                         {
 828                                                 $tr_after = array_pop ( $tr_attributes );
 829                                                 if ( !array_pop ( $tr_history ) ) {
 830                                                         $previous = "<tr{$tr_after}>\n";
 831                                                 }
 832                                                 array_push ( $tr_history , true );
 833                                                 array_push ( $tr_attributes , '' );
 834                                                 array_pop ( $has_opened_tr );
 835                                                 array_push ( $has_opened_tr , true );
 836                                         }
 837
 838                                         $last_tag = array_pop ( $last_tag_history );
 839
 840                                         if ( array_pop ( $td_history ) ) {
 841                                                 $previous = "</{$last_tag}>{$previous}";
 842                                         }
 843
 844                                         if ( $first_character == '|' ) {
 845                                                 $last_tag = 'td';
 846                                         } else if ( $first_character == '!' ) {
 847                                                 $last_tag = 'th';
 848                                         } else if ( $first_character == '+' ) {
 849                                                 $last_tag = 'caption';
 850                                         } else {
 851                                                 $last_tag = '';
 852                                         }
 853
 854                                         array_push ( $last_tag_history , $last_tag );
 855
 856                                         // A cell could contain both parameters and data
 857                                         $cell_data = explode ( '|' , $cell , 2 );
 858
 859                                         // Bug 553: Note that a '|' inside an invalid link should not
 860                                         // be mistaken as delimiting cell parameters
 861                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 862                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 863                                         } else if ( count ( $cell_data ) == 1 )
 864                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 865                                         else {
 866                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 867                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 868                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 869                                         }
 870
 871                                         $lines[$key] .= $cell;
 872                                         array_push ( $td_history , true );
 873                                 }
 874                         }
 875                 }
 876
 877                 // Closing open td, tr && table
 878                 while ( count ( $td_history ) > 0 )
 879                 {
 880                         if ( array_pop ( $td_history ) ) {
 881                                 $lines[] = '</td>' ;
 882                         }
 883                         if ( array_pop ( $tr_history ) ) {
 884                                 $lines[] = '</tr>' ;
 885                         }
 886                         if ( !array_pop ( $has_opened_tr ) ) {
 887                                 $lines[] = "<tr><td></td></tr>" ;
 888                         }
 889
 890                         $lines[] = '</table>' ;
 891                 }
 892
 893                 $output = implode ( "\n" , $lines ) ;
 894
 895                 // special case: don't return empty table
 896                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 897                         $output = '';
 898                 }
 899
 900                 wfProfileOut( $fname );
 901
 902                 return $output;
 903         }
 904
 905         /**
 906          * Helper function for parse() that transforms wiki markup into
 907          * HTML. Only called for $mOutputType == OT_HTML.
 908          *
 909          * @private
 910          */
 911         function internalParse( $text ) {
 912                 $isMain = true;
 913                 $fname = 'Parser::internalParse';
 914                 wfProfileIn( $fname );
 915
 916                 # Hook to suspend the parser in this state
 917                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 918                         wfProfileOut( $fname );
 919                         return $text ;
 920                 }
 921
 922                 # Remove <noinclude> tags and <includeonly> sections
 923                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 924                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 925                 $text = StringUtils::delimiterReplace( '<includeonly>', '</includeonly>', '', $text );
 926
 927                 $text = $this->replaceVariables( $text );
 928                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 929                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 930
 931                 // Tables need to come after variable replacement for things to work
 932                 // properly; putting them before other transformations should keep
 933                 // exciting things like link expansions from showing up in surprising
 934                 // places.
 935                 $text = $this->doTableStuff( $text );
 936
 937                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 938
 939                 $text = $this->stripToc( $text );
 940                 $this->stripNoGallery( $text );
 941                 $text = $this->doHeadings( $text );
 942                 if($this->mOptions->getUseDynamicDates()) {
 943                         $df =& DateFormatter::getInstance();
 944                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 945                 }
 946                 $text = $this->doAllQuotes( $text );
 947                 $text = $this->replaceInternalLinks( $text );
 948                 $text = $this->replaceExternalLinks( $text );
 949
 950                 # replaceInternalLinks may sometimes leave behind
 951                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 952                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 953
 954                 $text = $this->doMagicLinks( $text );
 955                 $text = $this->formatHeadings( $text, $isMain );
 956
 957                 wfProfileOut( $fname );
 958                 return $text;
 959         }
 960
 961         /**
 962          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 963          * magic external links.
 964          *
 965          * @private
 966          */
 967         function doMagicLinks( $text ) {
 968                 wfProfileIn( __METHOD__ );
 969                 $text = preg_replace_callback(
 970                         '!(?:                           # Start cases
 971                             <a.*?</a> |                 # Skip link text
 972                             <.*?> |                     # Skip stuff inside HTML elements
 973                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
 974                             ISBN\s+(\b                  # ISBN, capture number as m[2]
 975                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 976                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 977                                      [0-9Xx]                 # check digit
 978                                    \b)
 979                         )!x', array( &$this, 'magicLinkCallback' ), $text );
 980                 wfProfileOut( __METHOD__ );
 981                 return $text;
 982         }
 983
 984         function magicLinkCallback( $m ) {
 985                 if ( substr( $m[0], 0, 1 ) == '<' ) {
 986                         # Skip HTML element
 987                         return $m[0];
 988                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
 989                         $isbn = $m[2];
 990                         $num = strtr( $isbn, array(
 991                                 '-' => '',
 992                                 ' ' => '',
 993                                 'x' => 'X',
 994                         ));
 995                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
 996                         $text = '<a href="' .
 997                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
 998                                 "\" class=\"internal\">ISBN $isbn</a>";
 999                 } else {
1000                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1001                                 $keyword = 'RFC';
1002                                 $urlmsg = 'rfcurl';
1003                                 $id = $m[1];
1004                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1005                                 $keyword = 'PMID';
1006                                 $urlmsg = 'pubmedurl';
1007                                 $id = $m[1];
1008                         } else {
1009                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1010                                         substr($m[0], 0, 20 ) . '"' );
1011                         }
1012
1013                         $url = wfMsg( $urlmsg, $id);
1014                         $sk = $this->mOptions->getSkin();
1015                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1016                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1017                 }
1018                 return $text;
1019         }
1020
1021         /**
1022          * Parse headers and return html
1023          *
1024          * @private
1025          */
1026         function doHeadings( $text ) {
1027                 $fname = 'Parser::doHeadings';
1028                 wfProfileIn( $fname );
1029                 for ( $i = 6; $i >= 1; --$i ) {
1030                         $h = str_repeat( '=', $i );
1031                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1032                           "<h$i>\\1</h$i>", $text );
1033                 }
1034                 wfProfileOut( $fname );
1035                 return $text;
1036         }
1037
1038         /**
1039          * Replace single quotes with HTML markup
1040          * @private
1041          * @return string the altered text
1042          */
1043         function doAllQuotes( $text ) {
1044                 $fname = 'Parser::doAllQuotes';
1045                 wfProfileIn( $fname );
1046                 $outtext = '';
1047                 $lines = explode( "\n", $text );
1048                 foreach ( $lines as $line ) {
1049                         $outtext .= $this->doQuotes ( $line ) . "\n";
1050                 }
1051                 $outtext = substr($outtext, 0,-1);
1052                 wfProfileOut( $fname );
1053                 return $outtext;
1054         }
1055
1056         /**
1057          * Helper function for doAllQuotes()
1058          */
1059         public function doQuotes( $text ) {
1060                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1061                 if ( count( $arr ) == 1 )
1062                         return $text;
1063                 else
1064                 {
1065                         # First, do some preliminary work. This may shift some apostrophes from
1066                         # being mark-up to being text. It also counts the number of occurrences
1067                         # of bold and italics mark-ups.
1068                         $i = 0;
1069                         $numbold = 0;
1070                         $numitalics = 0;
1071                         foreach ( $arr as $r )
1072                         {
1073                                 if ( ( $i % 2 ) == 1 )
1074                                 {
1075                                         # If there are ever four apostrophes, assume the first is supposed to
1076                                         # be text, and the remaining three constitute mark-up for bold text.
1077                                         if ( strlen( $arr[$i] ) == 4 )
1078                                         {
1079                                                 $arr[$i-1] .= "'";
1080                                                 $arr[$i] = "'''";
1081                                         }
1082                                         # If there are more than 5 apostrophes in a row, assume they're all
1083                                         # text except for the last 5.
1084                                         else if ( strlen( $arr[$i] ) > 5 )
1085                                         {
1086                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1087                                                 $arr[$i] = "'''''";
1088                                         }
1089                                         # Count the number of occurrences of bold and italics mark-ups.
1090                                         # We are not counting sequences of five apostrophes.
1091                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1092                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1093                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1094                                 }
1095                                 $i++;
1096                         }
1097
1098                         # If there is an odd number of both bold and italics, it is likely
1099                         # that one of the bold ones was meant to be an apostrophe followed
1100                         # by italics. Which one we cannot know for certain, but it is more
1101                         # likely to be one that has a single-letter word before it.
1102                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1103                         {
1104                                 $i = 0;
1105                                 $firstsingleletterword = -1;
1106                                 $firstmultiletterword = -1;
1107                                 $firstspace = -1;
1108                                 foreach ( $arr as $r )
1109                                 {
1110                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1111                                         {
1112                                                 $x1 = substr ($arr[$i-1], -1);
1113                                                 $x2 = substr ($arr[$i-1], -2, 1);
1114                                                 if ($x1 == ' ') {
1115                                                         if ($firstspace == -1) $firstspace = $i;
1116                                                 } else if ($x2 == ' ') {
1117                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1118                                                 } else {
1119                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1120                                                 }
1121                                         }
1122                                         $i++;
1123                                 }
1124
1125                                 # If there is a single-letter word, use it!
1126                                 if ($firstsingleletterword > -1)
1127                                 {
1128                                         $arr [ $firstsingleletterword ] = "''";
1129                                         $arr [ $firstsingleletterword-1 ] .= "'";
1130                                 }
1131                                 # If not, but there's a multi-letter word, use that one.
1132                                 else if ($firstmultiletterword > -1)
1133                                 {
1134                                         $arr [ $firstmultiletterword ] = "''";
1135                                         $arr [ $firstmultiletterword-1 ] .= "'";
1136                                 }
1137                                 # ... otherwise use the first one that has neither.
1138                                 # (notice that it is possible for all three to be -1 if, for example,
1139                                 # there is only one pentuple-apostrophe in the line)
1140                                 else if ($firstspace > -1)
1141                                 {
1142                                         $arr [ $firstspace ] = "''";
1143                                         $arr [ $firstspace-1 ] .= "'";
1144                                 }
1145                         }
1146
1147                         # Now let's actually convert our apostrophic mush to HTML!
1148                         $output = '';
1149                         $buffer = '';
1150                         $state = '';
1151                         $i = 0;
1152                         foreach ($arr as $r)
1153                         {
1154                                 if (($i % 2) == 0)
1155                                 {
1156                                         if ($state == 'both')
1157                                                 $buffer .= $r;
1158                                         else
1159                                                 $output .= $r;
1160                                 }
1161                                 else
1162                                 {
1163                                         if (strlen ($r) == 2)
1164                                         {
1165                                                 if ($state == 'i')
1166                                                 { $output .= '</i>'; $state = ''; }
1167                                                 else if ($state == 'bi')
1168                                                 { $output .= '</i>'; $state = 'b'; }
1169                                                 else if ($state == 'ib')
1170                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1171                                                 else if ($state == 'both')
1172                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1173                                                 else # $state can be 'b' or ''
1174                                                 { $output .= '<i>'; $state .= 'i'; }
1175                                         }
1176                                         else if (strlen ($r) == 3)
1177                                         {
1178                                                 if ($state == 'b')
1179                                                 { $output .= '</b>'; $state = ''; }
1180                                                 else if ($state == 'bi')
1181                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1182                                                 else if ($state == 'ib')
1183                                                 { $output .= '</b>'; $state = 'i'; }
1184                                                 else if ($state == 'both')
1185                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1186                                                 else # $state can be 'i' or ''
1187                                                 { $output .= '<b>'; $state .= 'b'; }
1188                                         }
1189                                         else if (strlen ($r) == 5)
1190                                         {
1191                                                 if ($state == 'b')
1192                                                 { $output .= '</b><i>'; $state = 'i'; }
1193                                                 else if ($state == 'i')
1194                                                 { $output .= '</i><b>'; $state = 'b'; }
1195                                                 else if ($state == 'bi')
1196                                                 { $output .= '</i></b>'; $state = ''; }
1197                                                 else if ($state == 'ib')
1198                                                 { $output .= '</b></i>'; $state = ''; }
1199                                                 else if ($state == 'both')
1200                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1201                                                 else # ($state == '')
1202                                                 { $buffer = ''; $state = 'both'; }
1203                                         }
1204                                 }
1205                                 $i++;
1206                         }
1207                         # Now close all remaining tags.  Notice that the order is important.
1208                         if ($state == 'b' || $state == 'ib')
1209                                 $output .= '</b>';
1210                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1211                                 $output .= '</i>';
1212                         if ($state == 'bi')
1213                                 $output .= '</b>';
1214                         # There might be lonely ''''', so make sure we have a buffer
1215                         if ($state == 'both' && $buffer)
1216                                 $output .= '<b><i>'.$buffer.'</i></b>';
1217                         return $output;
1218                 }
1219         }
1220
1221         /**
1222          * Replace external links
1223          *
1224          * Note: this is all very hackish and the order of execution matters a lot.
1225          * Make sure to run maintenance/parserTests.php if you change this code.
1226          *
1227          * @private
1228          */
1229         function replaceExternalLinks( $text ) {
1230                 global $wgContLang;
1231                 $fname = 'Parser::replaceExternalLinks';
1232                 wfProfileIn( $fname );
1233
1234                 $sk = $this->mOptions->getSkin();
1235
1236                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1237
1238                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1239
1240                 $i = 0;
1241                 while ( $i<count( $bits ) ) {
1242                         $url = $bits[$i++];
1243                         $protocol = $bits[$i++];
1244                         $text = $bits[$i++];
1245                         $trail = $bits[$i++];
1246
1247                         # The characters '<' and '>' (which were escaped by
1248                         # removeHTMLtags()) should not be included in
1249                         # URLs, per RFC 2396.
1250                         $m2 = array();
1251                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1252                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1253                                 $url = substr($url, 0, $m2[0][1]);
1254                         }
1255
1256                         # If the link text is an image URL, replace it with an <img> tag
1257                         # This happened by accident in the original parser, but some people used it extensively
1258                         $img = $this->maybeMakeExternalImage( $text );
1259                         if ( $img !== false ) {
1260                                 $text = $img;
1261                         }
1262
1263                         $dtrail = '';
1264
1265                         # Set linktype for CSS - if URL==text, link is essentially free
1266                         $linktype = ($text == $url) ? 'free' : 'text';
1267
1268                         # No link text, e.g. [http://domain.tld/some.link]
1269                         if ( $text == '' ) {
1270                                 # Autonumber if allowed. See bug #5918
1271                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1272                                         $text = '[' . ++$this->mAutonumber . ']';
1273                                         $linktype = 'autonumber';
1274                                 } else {
1275                                         # Otherwise just use the URL
1276                                         $text = htmlspecialchars( $url );
1277                                         $linktype = 'free';
1278                                 }
1279                         } else {
1280                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1281                                 # Check for trail
1282                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1283                         }
1284
1285                         $text = $wgContLang->markNoConversion($text);
1286
1287                         $url = Sanitizer::cleanUrl( $url );
1288
1289                         # Process the trail (i.e. everything after this link up until start of the next link),
1290                         # replacing any non-bracketed links
1291                         $trail = $this->replaceFreeExternalLinks( $trail );
1292
1293                         # Use the encoded URL
1294                         # This means that users can paste URLs directly into the text
1295                         # Funny characters like &ouml; aren't valid in URLs anyway
1296                         # This was changed in August 2004
1297                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1298
1299                         # Register link in the output object.
1300                         # Replace unnecessary URL escape codes with the referenced character
1301                         # This prevents spammers from hiding links from the filters
1302                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1303                         $this->mOutput->addExternalLink( $pasteurized );
1304                 }
1305
1306                 wfProfileOut( $fname );
1307                 return $s;
1308         }
1309
1310         /**
1311          * Replace anything that looks like a URL with a link
1312          * @private
1313          */
1314         function replaceFreeExternalLinks( $text ) {
1315                 global $wgContLang;
1316                 $fname = 'Parser::replaceFreeExternalLinks';
1317                 wfProfileIn( $fname );
1318
1319                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1320                 $s = array_shift( $bits );
1321                 $i = 0;
1322
1323                 $sk = $this->mOptions->getSkin();
1324
1325                 while ( $i < count( $bits ) ){
1326                         $protocol = $bits[$i++];
1327                         $remainder = $bits[$i++];
1328
1329                         $m = array();
1330                         if ( preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1331                                 # Found some characters after the protocol that look promising
1332                                 $url = $protocol . $m[1];
1333                                 $trail = $m[2];
1334
1335                                 # special case: handle urls as url args:
1336                                 # http://www.example.com/foo?=http://www.example.com/bar
1337                                 if(strlen($trail) == 0 &&
1338                                         isset($bits[$i]) &&
1339                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1340                                         preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1341                                 {
1342                                         # add protocol, arg
1343                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1344                                         $i += 2;
1345                                         $trail = $m[2];
1346                                 }
1347
1348                                 # The characters '<' and '>' (which were escaped by
1349                                 # removeHTMLtags()) should not be included in
1350                                 # URLs, per RFC 2396.
1351                                 $m2 = array();
1352                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1353                                         $trail = substr($url, $m2[0][1]) . $trail;
1354                                         $url = substr($url, 0, $m2[0][1]);
1355                                 }
1356
1357                                 # Move trailing punctuation to $trail
1358                                 $sep = ',;\.:!?';
1359                                 # If there is no left bracket, then consider right brackets fair game too
1360                                 if ( strpos( $url, '(' ) === false ) {
1361                                         $sep .= ')';
1362                                 }
1363
1364                                 $numSepChars = strspn( strrev( $url ), $sep );
1365                                 if ( $numSepChars ) {
1366                                         $trail = substr( $url, -$numSepChars ) . $trail;
1367                                         $url = substr( $url, 0, -$numSepChars );
1368                                 }
1369
1370                                 $url = Sanitizer::cleanUrl( $url );
1371
1372                                 # Is this an external image?
1373                                 $text = $this->maybeMakeExternalImage( $url );
1374                                 if ( $text === false ) {
1375                                         # Not an image, make a link
1376                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1377                                         # Register it in the output object...
1378                                         # Replace unnecessary URL escape codes with their equivalent characters
1379                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1380                                         $this->mOutput->addExternalLink( $pasteurized );
1381                                 }
1382                                 $s .= $text . $trail;
1383                         } else {
1384                                 $s .= $protocol . $remainder;
1385                         }
1386                 }
1387                 wfProfileOut( $fname );
1388                 return $s;
1389         }
1390
1391         /**
1392          * Replace unusual URL escape codes with their equivalent characters
1393          * @param string
1394          * @return string
1395          * @static
1396          * @todo  This can merge genuinely required bits in the path or query string,
1397          *        breaking legit URLs. A proper fix would treat the various parts of
1398          *        the URL differently; as a workaround, just use the output for
1399          *        statistical records, not for actual linking/output.
1400          */
1401         static function replaceUnusualEscapes( $url ) {
1402                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1403                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1404         }
1405
1406         /**
1407          * Callback function used in replaceUnusualEscapes().
1408          * Replaces unusual URL escape codes with their equivalent character
1409          * @static
1410          * @private
1411          */
1412         private static function replaceUnusualEscapesCallback( $matches ) {
1413                 $char = urldecode( $matches[0] );
1414                 $ord = ord( $char );
1415                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1416                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1417                         // No, shouldn't be escaped
1418                         return $char;
1419                 } else {
1420                         // Yes, leave it escaped
1421                         return $matches[0];
1422                 }
1423         }
1424
1425         /**
1426          * make an image if it's allowed, either through the global
1427          * option or through the exception
1428          * @private
1429          */
1430         function maybeMakeExternalImage( $url ) {
1431                 $sk = $this->mOptions->getSkin();
1432                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1433                 $imagesexception = !empty($imagesfrom);
1434                 $text = false;
1435                 if ( $this->mOptions->getAllowExternalImages()
1436                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1437                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1438                                 # Image found
1439                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1440                         }
1441                 }
1442                 return $text;
1443         }
1444
1445         /**
1446          * Process [[ ]] wikilinks
1447          *
1448          * @private
1449          */
1450         function replaceInternalLinks( $s ) {
1451                 global $wgContLang;
1452                 static $fname = 'Parser::replaceInternalLinks' ;
1453
1454                 wfProfileIn( $fname );
1455
1456                 wfProfileIn( $fname.'-setup' );
1457                 static $tc = FALSE;
1458                 # the % is needed to support urlencoded titles as well
1459                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1460
1461                 $sk = $this->mOptions->getSkin();
1462
1463                 #split the entire text string on occurences of [[
1464                 $a = explode( '[[', ' ' . $s );
1465                 #get the first element (all text up to first [[), and remove the space we added
1466                 $s = array_shift( $a );
1467                 $s = substr( $s, 1 );
1468
1469                 # Match a link having the form [[namespace:link|alternate]]trail
1470                 static $e1 = FALSE;
1471                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1472                 # Match cases where there is no "]]", which might still be images
1473                 static $e1_img = FALSE;
1474                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1475
1476                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1477                 $e2 = null;
1478                 if ( $useLinkPrefixExtension ) {
1479                         # Match the end of a line for a word that's not followed by whitespace,
1480                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1481                         $e2 = wfMsgForContent( 'linkprefix' );
1482                 }
1483
1484                 if( is_null( $this->mTitle ) ) {
1485                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1486                 }
1487                 $nottalk = !$this->mTitle->isTalkPage();
1488
1489                 if ( $useLinkPrefixExtension ) {
1490                         $m = array();
1491                         if ( preg_match( $e2, $s, $m ) ) {
1492                                 $first_prefix = $m[2];
1493                         } else {
1494                                 $first_prefix = false;
1495                         }
1496                 } else {
1497                         $prefix = '';
1498                 }
1499
1500                 if($wgContLang->hasVariants()) {
1501                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1502                 } else {
1503                         $selflink = array($this->mTitle->getPrefixedText());
1504                 }
1505                 $useSubpages = $this->areSubpagesAllowed();
1506                 wfProfileOut( $fname.'-setup' );
1507
1508                 # Loop for each link
1509                 for ($k = 0; isset( $a[$k] ); $k++) {
1510                         $line = $a[$k];
1511                         if ( $useLinkPrefixExtension ) {
1512                                 wfProfileIn( $fname.'-prefixhandling' );
1513                                 if ( preg_match( $e2, $s, $m ) ) {
1514                                         $prefix = $m[2];
1515                                         $s = $m[1];
1516                                 } else {
1517                                         $prefix='';
1518                                 }
1519                                 # first link
1520                                 if($first_prefix) {
1521                                         $prefix = $first_prefix;
1522                                         $first_prefix = false;
1523                                 }
1524                                 wfProfileOut( $fname.'-prefixhandling' );
1525                         }
1526
1527                         $might_be_img = false;
1528
1529                         wfProfileIn( "$fname-e1" );
1530                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1531                                 $text = $m[2];
1532                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1533                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1534                                 # the real problem is with the $e1 regex
1535                                 # See bug 1300.
1536                                 #
1537                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1538                                 # and no image is in sight. See bug 2095.
1539                                 #
1540                                 if( $text !== '' &&
1541                                         substr( $m[3], 0, 1 ) === ']' &&
1542                                         strpos($text, '[') !== false
1543                                 )
1544                                 {
1545                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1546                                         $m[3] = substr( $m[3], 1 );
1547                                 }
1548                                 # fix up urlencoded title texts
1549                                 if( strpos( $m[1], '%' ) !== false ) {
1550                                         # Should anchors '#' also be rejected?
1551                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1552                                 }
1553                                 $trail = $m[3];
1554                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1555                                 $might_be_img = true;
1556                                 $text = $m[2];
1557                                 if ( strpos( $m[1], '%' ) !== false ) {
1558                                         $m[1] = urldecode($m[1]);
1559                                 }
1560                                 $trail = "";
1561                         } else { # Invalid form; output directly
1562                                 $s .= $prefix . '[[' . $line ;
1563                                 wfProfileOut( "$fname-e1" );
1564                                 continue;
1565                         }
1566                         wfProfileOut( "$fname-e1" );
1567                         wfProfileIn( "$fname-misc" );
1568
1569                         # Don't allow internal links to pages containing
1570                         # PROTO: where PROTO is a valid URL protocol; these
1571                         # should be external links.
1572                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1573                                 $s .= $prefix . '[[' . $line ;
1574                                 continue;
1575                         }
1576
1577                         # Make subpage if necessary
1578                         if( $useSubpages ) {
1579                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1580                         } else {
1581                                 $link = $m[1];
1582                         }
1583
1584                         $noforce = (substr($m[1], 0, 1) != ':');
1585                         if (!$noforce) {
1586                                 # Strip off leading ':'
1587                                 $link = substr($link, 1);
1588                         }
1589
1590                         wfProfileOut( "$fname-misc" );
1591                         wfProfileIn( "$fname-title" );
1592                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1593                         if( !$nt ) {
1594                                 $s .= $prefix . '[[' . $line;
1595                                 wfProfileOut( "$fname-title" );
1596                                 continue;
1597                         }
1598
1599                         $ns = $nt->getNamespace();
1600                         $iw = $nt->getInterWiki();
1601                         wfProfileOut( "$fname-title" );
1602
1603                         if ($might_be_img) { # if this is actually an invalid link
1604                                 wfProfileIn( "$fname-might_be_img" );
1605                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1606                                         $found = false;
1607                                         while (isset ($a[$k+1]) ) {
1608                                                 #look at the next 'line' to see if we can close it there
1609                                                 $spliced = array_splice( $a, $k + 1, 1 );
1610                                                 $next_line = array_shift( $spliced );
1611                                                 $m = explode( ']]', $next_line, 3 );
1612                                                 if ( count( $m ) == 3 ) {
1613                                                         # the first ]] closes the inner link, the second the image
1614                                                         $found = true;
1615                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1616                                                         $trail = $m[2];
1617                                                         break;
1618                                                 } elseif ( count( $m ) == 2 ) {
1619                                                         #if there's exactly one ]] that's fine, we'll keep looking
1620                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1621                                                 } else {
1622                                                         #if $next_line is invalid too, we need look no further
1623                                                         $text .= '[[' . $next_line;
1624                                                         break;
1625                                                 }
1626                                         }
1627                                         if ( !$found ) {
1628                                                 # we couldn't find the end of this imageLink, so output it raw
1629                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1630                                                 $text = $this->replaceInternalLinks($text);
1631                                                 $s .= "{$prefix}[[$link|$text";
1632                                                 # note: no $trail, because without an end, there *is* no trail
1633                                                 wfProfileOut( "$fname-might_be_img" );
1634                                                 continue;
1635                                         }
1636                                 } else { #it's not an image, so output it raw
1637                                         $s .= "{$prefix}[[$link|$text";
1638                                         # note: no $trail, because without an end, there *is* no trail
1639                                         wfProfileOut( "$fname-might_be_img" );
1640                                         continue;
1641                                 }
1642                                 wfProfileOut( "$fname-might_be_img" );
1643                         }
1644
1645                         $wasblank = ( '' == $text );
1646                         if( $wasblank ) $text = $link;
1647
1648                         # Link not escaped by : , create the various objects
1649                         if( $noforce ) {
1650
1651                                 # Interwikis
1652                                 wfProfileIn( "$fname-interwiki" );
1653                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1654                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1655                                         $s = rtrim($s . $prefix);
1656                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1657                                         wfProfileOut( "$fname-interwiki" );
1658                                         continue;
1659                                 }
1660                                 wfProfileOut( "$fname-interwiki" );
1661
1662                                 if ( $ns == NS_IMAGE ) {
1663                                         wfProfileIn( "$fname-image" );
1664                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1665                                                 # recursively parse links inside the image caption
1666                                                 # actually, this will parse them in any other parameters, too,
1667                                                 # but it might be hard to fix that, and it doesn't matter ATM
1668                                                 $text = $this->replaceExternalLinks($text);
1669                                                 $text = $this->replaceInternalLinks($text);
1670
1671                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1672                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1673                                                 $this->mOutput->addImage( $nt->getDBkey() );
1674
1675                                                 wfProfileOut( "$fname-image" );
1676                                                 continue;
1677                                         } else {
1678                                                 # We still need to record the image's presence on the page
1679                                                 $this->mOutput->addImage( $nt->getDBkey() );
1680                                         }
1681                                         wfProfileOut( "$fname-image" );
1682
1683                                 }
1684
1685                                 if ( $ns == NS_CATEGORY ) {
1686                                         wfProfileIn( "$fname-category" );
1687                                         $s = rtrim($s . "\n"); # bug 87
1688
1689                                         if ( $wasblank ) {
1690                                                 $sortkey = $this->getDefaultSort();
1691                                         } else {
1692                                                 $sortkey = $text;
1693                                         }
1694                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1695                                         $sortkey = str_replace( "\n", '', $sortkey );
1696                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1697                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1698
1699                                         /**
1700                                          * Strip the whitespace Category links produce, see bug 87
1701                                          * @todo We might want to use trim($tmp, "\n") here.
1702                                          */
1703                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1704
1705                                         wfProfileOut( "$fname-category" );
1706                                         continue;
1707                                 }
1708                         }
1709
1710                         # Self-link checking
1711                         if( $nt->getFragment() === '' ) {
1712                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1713                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1714                                         continue;
1715                                 }
1716                         }
1717
1718                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1719                         if( $ns == NS_MEDIA ) {
1720                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1721                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1722                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1723                                 $this->mOutput->addImage( $nt->getDBkey() );
1724                                 continue;
1725                         } elseif( $ns == NS_SPECIAL ) {
1726                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1727                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1728                                 } else {
1729                                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1730                                 }
1731                                 continue;
1732                         } elseif( $ns == NS_IMAGE ) {
1733                                 $img = wfFindFile( $nt );
1734                                 if( $img ) {
1735                                         // Force a blue link if the file exists; may be a remote
1736                                         // upload on the shared repository, and we want to see its
1737                                         // auto-generated page.
1738                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1739                                         $this->mOutput->addLink( $nt );
1740                                         continue;
1741                                 }
1742                         }
1743                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1744                 }
1745                 wfProfileOut( $fname );
1746                 return $s;
1747         }
1748
1749         /**
1750          * Make a link placeholder. The text returned can be later resolved to a real link with
1751          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1752          * parsing of interwiki links, and secondly to allow all existence checks and
1753          * article length checks (for stub links) to be bundled into a single query.
1754          *
1755          */
1756         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1757                 wfProfileIn( __METHOD__ );
1758                 if ( ! is_object($nt) ) {
1759                         # Fail gracefully
1760                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1761                 } else {
1762                         # Separate the link trail from the rest of the link
1763                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1764
1765                         if ( $nt->isExternal() ) {
1766                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1767                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1768                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1769                         } else {
1770                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1771                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1772                                 $this->mLinkHolders['queries'][] = $query;
1773                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1774                                 $this->mLinkHolders['titles'][] = $nt;
1775
1776                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1777                         }
1778                 }
1779                 wfProfileOut( __METHOD__ );
1780                 return $retVal;
1781         }
1782
1783         /**
1784          * Render a forced-blue link inline; protect against double expansion of
1785          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1786          * Since this little disaster has to split off the trail text to avoid
1787          * breaking URLs in the following text without breaking trails on the
1788          * wiki links, it's been made into a horrible function.
1789          *
1790          * @param Title $nt
1791          * @param string $text
1792          * @param string $query
1793          * @param string $trail
1794          * @param string $prefix
1795          * @return string HTML-wikitext mix oh yuck
1796          */
1797         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1798                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1799                 $sk = $this->mOptions->getSkin();
1800                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1801                 return $this->armorLinks( $link ) . $trail;
1802         }
1803
1804         /**
1805          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1806          * going to go through further parsing steps before inline URL expansion.
1807          *
1808          * In particular this is important when using action=render, which causes
1809          * full URLs to be included.
1810          *
1811          * Oh man I hate our multi-layer parser!
1812          *
1813          * @param string more-or-less HTML
1814          * @return string less-or-more HTML with NOPARSE bits
1815          */
1816         function armorLinks( $text ) {
1817                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1818                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1819         }
1820
1821         /**
1822          * Return true if subpage links should be expanded on this page.
1823          * @return bool
1824          */
1825         function areSubpagesAllowed() {
1826                 # Some namespaces don't allow subpages
1827                 global $wgNamespacesWithSubpages;
1828                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1829         }
1830
1831         /**
1832          * Handle link to subpage if necessary
1833          * @param string $target the source of the link
1834          * @param string &$text the link text, modified as necessary
1835          * @return string the full name of the link
1836          * @private
1837          */
1838         function maybeDoSubpageLink($target, &$text) {
1839                 # Valid link forms:
1840                 # Foobar -- normal
1841                 # :Foobar -- override special treatment of prefix (images, language links)
1842                 # /Foobar -- convert to CurrentPage/Foobar
1843                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1844                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1845                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1846
1847                 $fname = 'Parser::maybeDoSubpageLink';
1848                 wfProfileIn( $fname );
1849                 $ret = $target; # default return value is no change
1850
1851                 # Some namespaces don't allow subpages,
1852                 # so only perform processing if subpages are allowed
1853                 if( $this->areSubpagesAllowed() ) {
1854                         $hash = strpos( $target, '#' );
1855                         if( $hash !== false ) {
1856                                 $suffix = substr( $target, $hash );
1857                                 $target = substr( $target, 0, $hash );
1858                         } else {
1859                                 $suffix = '';
1860                         }
1861                         # bug 7425
1862                         $target = trim( $target );
1863                         # Look at the first character
1864                         if( $target != '' && $target{0} == '/' ) {
1865                                 # / at end means we don't want the slash to be shown
1866                                 $m = array();
1867                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1868                                 if( $trailingSlashes ) {
1869                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1870                                 } else {
1871                                         $noslash = substr( $target, 1 );
1872                                 }
1873
1874                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1875                                 if( '' === $text ) {
1876                                         $text = $target . $suffix;
1877                                 } # this might be changed for ugliness reasons
1878                         } else {
1879                                 # check for .. subpage backlinks
1880                                 $dotdotcount = 0;
1881                                 $nodotdot = $target;
1882                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1883                                         ++$dotdotcount;
1884                                         $nodotdot = substr( $nodotdot, 3 );
1885                                 }
1886                                 if($dotdotcount > 0) {
1887                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1888                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1889                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1890                                                 # / at the end means don't show full path
1891                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1892                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1893                                                         if( '' === $text ) {
1894                                                                 $text = $nodotdot . $suffix;
1895                                                         }
1896                                                 }
1897                                                 $nodotdot = trim( $nodotdot );
1898                                                 if( $nodotdot != '' ) {
1899                                                         $ret .= '/' . $nodotdot;
1900                                                 }
1901                                                 $ret .= $suffix;
1902                                         }
1903                                 }
1904                         }
1905                 }
1906
1907                 wfProfileOut( $fname );
1908                 return $ret;
1909         }
1910
1911         /**#@+
1912          * Used by doBlockLevels()
1913          * @private
1914          */
1915         /* private */ function closeParagraph() {
1916                 $result = '';
1917                 if ( '' != $this->mLastSection ) {
1918                         $result = '</' . $this->mLastSection  . ">\n";
1919                 }
1920                 $this->mInPre = false;
1921                 $this->mLastSection = '';
1922                 return $result;
1923         }
1924         # getCommon() returns the length of the longest common substring
1925         # of both arguments, starting at the beginning of both.
1926         #
1927         /* private */ function getCommon( $st1, $st2 ) {
1928                 $fl = strlen( $st1 );
1929                 $shorter = strlen( $st2 );
1930                 if ( $fl < $shorter ) { $shorter = $fl; }
1931
1932                 for ( $i = 0; $i < $shorter; ++$i ) {
1933                         if ( $st1{$i} != $st2{$i} ) { break; }
1934                 }
1935                 return $i;
1936         }
1937         # These next three functions open, continue, and close the list
1938         # element appropriate to the prefix character passed into them.
1939         #
1940         /* private */ function openList( $char ) {
1941                 $result = $this->closeParagraph();
1942
1943                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1944                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1945                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1946                 else if ( ';' == $char ) {
1947                         $result .= '<dl><dt>';
1948                         $this->mDTopen = true;
1949                 }
1950                 else { $result = '<!-- ERR 1 -->'; }
1951
1952                 return $result;
1953         }
1954
1955         /* private */ function nextItem( $char ) {
1956                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1957                 else if ( ':' == $char || ';' == $char ) {
1958                         $close = '</dd>';
1959                         if ( $this->mDTopen ) { $close = '</dt>'; }
1960                         if ( ';' == $char ) {
1961                                 $this->mDTopen = true;
1962                                 return $close . '<dt>';
1963                         } else {
1964                                 $this->mDTopen = false;
1965                                 return $close . '<dd>';
1966                         }
1967                 }
1968                 return '<!-- ERR 2 -->';
1969         }
1970
1971         /* private */ function closeList( $char ) {
1972                 if ( '*' == $char ) { $text = '</li></ul>'; }
1973                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1974                 else if ( ':' == $char ) {
1975                         if ( $this->mDTopen ) {
1976                                 $this->mDTopen = false;
1977                                 $text = '</dt></dl>';
1978                         } else {
1979                                 $text = '</dd></dl>';
1980                         }
1981                 }
1982                 else {  return '<!-- ERR 3 -->'; }
1983                 return $text."\n";
1984         }
1985         /**#@-*/
1986
1987         /**
1988          * Make lists from lines starting with ':', '*', '#', etc.
1989          *
1990          * @private
1991          * @return string the lists rendered as HTML
1992          */
1993         function doBlockLevels( $text, $linestart ) {
1994                 $fname = 'Parser::doBlockLevels';
1995                 wfProfileIn( $fname );
1996
1997                 # Parsing through the text line by line.  The main thing
1998                 # happening here is handling of block-level elements p, pre,
1999                 # and making lists from lines starting with * # : etc.
2000                 #
2001                 $textLines = explode( "\n", $text );
2002
2003                 $lastPrefix = $output = '';
2004                 $this->mDTopen = $inBlockElem = false;
2005                 $prefixLength = 0;
2006                 $paragraphStack = false;
2007
2008                 if ( !$linestart ) {
2009                         $output .= array_shift( $textLines );
2010                 }
2011                 foreach ( $textLines as $oLine ) {
2012                         $lastPrefixLength = strlen( $lastPrefix );
2013                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2014                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2015                         if ( !$this->mInPre ) {
2016                                 # Multiple prefixes may abut each other for nested lists.
2017                                 $prefixLength = strspn( $oLine, '*#:;' );
2018                                 $pref = substr( $oLine, 0, $prefixLength );
2019
2020                                 # eh?
2021                                 $pref2 = str_replace( ';', ':', $pref );
2022                                 $t = substr( $oLine, $prefixLength );
2023                                 $this->mInPre = !empty($preOpenMatch);
2024                         } else {
2025                                 # Don't interpret any other prefixes in preformatted text
2026                                 $prefixLength = 0;
2027                                 $pref = $pref2 = '';
2028                                 $t = $oLine;
2029                         }
2030
2031                         # List generation
2032                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2033                                 # Same as the last item, so no need to deal with nesting or opening stuff
2034                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2035                                 $paragraphStack = false;
2036
2037                                 if ( substr( $pref, -1 ) == ';') {
2038                                         # The one nasty exception: definition lists work like this:
2039                                         # ; title : definition text
2040                                         # So we check for : in the remainder text to split up the
2041                                         # title and definition, without b0rking links.
2042                                         $term = $t2 = '';
2043                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2044                                                 $t = $t2;
2045                                                 $output .= $term . $this->nextItem( ':' );
2046                                         }
2047                                 }
2048                         } elseif( $prefixLength || $lastPrefixLength ) {
2049                                 # Either open or close a level...
2050                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2051                                 $paragraphStack = false;
2052
2053                                 while( $commonPrefixLength < $lastPrefixLength ) {
2054                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2055                                         --$lastPrefixLength;
2056                                 }
2057                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2058                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2059                                 }
2060                                 while ( $prefixLength > $commonPrefixLength ) {
2061                                         $char = substr( $pref, $commonPrefixLength, 1 );
2062                                         $output .= $this->openList( $char );
2063
2064                                         if ( ';' == $char ) {
2065                                                 # FIXME: This is dupe of code above
2066                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2067                                                         $t = $t2;
2068                                                         $output .= $term . $this->nextItem( ':' );
2069                                                 }
2070                                         }
2071                                         ++$commonPrefixLength;
2072                                 }
2073                                 $lastPrefix = $pref2;
2074                         }
2075                         if( 0 == $prefixLength ) {
2076                                 wfProfileIn( "$fname-paragraph" );
2077                                 # No prefix (not in list)--go to paragraph mode
2078                                 // XXX: use a stack for nestable elements like span, table and div
2079                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2080                                 $closematch = preg_match(
2081                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2082                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2083                                 if ( $openmatch or $closematch ) {
2084                                         $paragraphStack = false;
2085                                         # TODO bug 5718: paragraph closed
2086                                         $output .= $this->closeParagraph();
2087                                         if ( $preOpenMatch and !$preCloseMatch ) {
2088                                                 $this->mInPre = true;
2089                                         }
2090                                         if ( $closematch ) {
2091                                                 $inBlockElem = false;
2092                                         } else {
2093                                                 $inBlockElem = true;
2094                                         }
2095                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2096                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2097                                                 // pre
2098                                                 if ($this->mLastSection != 'pre') {
2099                                                         $paragraphStack = false;
2100                                                         $output .= $this->closeParagraph().'<pre>';
2101                                                         $this->mLastSection = 'pre';
2102                                                 }
2103                                                 $t = substr( $t, 1 );
2104                                         } else {
2105                                                 // paragraph
2106                                                 if ( '' == trim($t) ) {
2107                                                         if ( $paragraphStack ) {
2108                                                                 $output .= $paragraphStack.'<br />';
2109                                                                 $paragraphStack = false;
2110                                                                 $this->mLastSection = 'p';
2111                                                         } else {
2112                                                                 if ($this->mLastSection != 'p' ) {
2113                                                                         $output .= $this->closeParagraph();
2114                                                                         $this->mLastSection = '';
2115                                                                         $paragraphStack = '<p>';
2116                                                                 } else {
2117                                                                         $paragraphStack = '</p><p>';
2118                                                                 }
2119                                                         }
2120                                                 } else {
2121                                                         if ( $paragraphStack ) {
2122                                                                 $output .= $paragraphStack;
2123                                                                 $paragraphStack = false;
2124                                                                 $this->mLastSection = 'p';
2125                                                         } else if ($this->mLastSection != 'p') {
2126                                                                 $output .= $this->closeParagraph().'<p>';
2127                                                                 $this->mLastSection = 'p';
2128                                                         }
2129                                                 }
2130                                         }
2131                                 }
2132                                 wfProfileOut( "$fname-paragraph" );
2133                         }
2134                         // somewhere above we forget to get out of pre block (bug 785)
2135                         if($preCloseMatch && $this->mInPre) {
2136                                 $this->mInPre = false;
2137                         }
2138                         if ($paragraphStack === false) {
2139                                 $output .= $t."\n";
2140                         }
2141                 }
2142                 while ( $prefixLength ) {
2143                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2144                         --$prefixLength;
2145                 }
2146                 if ( '' != $this->mLastSection ) {
2147                         $output .= '</' . $this->mLastSection . '>';
2148                         $this->mLastSection = '';
2149                 }
2150
2151                 wfProfileOut( $fname );
2152                 return $output;
2153         }
2154
2155         /**
2156          * Split up a string on ':', ignoring any occurences inside tags
2157          * to prevent illegal overlapping.
2158          * @param string $str the string to split
2159          * @param string &$before set to everything before the ':'
2160          * @param string &$after set to everything after the ':'
2161          * return string the position of the ':', or false if none found
2162          */
2163         function findColonNoLinks($str, &$before, &$after) {
2164                 $fname = 'Parser::findColonNoLinks';
2165                 wfProfileIn( $fname );
2166
2167                 $pos = strpos( $str, ':' );
2168                 if( $pos === false ) {
2169                         // Nothing to find!
2170                         wfProfileOut( $fname );
2171                         return false;
2172                 }
2173
2174                 $lt = strpos( $str, '<' );
2175                 if( $lt === false || $lt > $pos ) {
2176                         // Easy; no tag nesting to worry about
2177                         $before = substr( $str, 0, $pos );
2178                         $after = substr( $str, $pos+1 );
2179                         wfProfileOut( $fname );
2180                         return $pos;
2181                 }
2182
2183                 // Ugly state machine to walk through avoiding tags.
2184                 $state = self::COLON_STATE_TEXT;
2185                 $stack = 0;
2186                 $len = strlen( $str );
2187                 for( $i = 0; $i < $len; $i++ ) {
2188                         $c = $str{$i};
2189
2190                         switch( $state ) {
2191                         // (Using the number is a performance hack for common cases)
2192                         case 0: // self::COLON_STATE_TEXT:
2193                                 switch( $c ) {
2194                                 case "<":
2195                                         // Could be either a <start> tag or an </end> tag
2196                                         $state = self::COLON_STATE_TAGSTART;
2197                                         break;
2198                                 case ":":
2199                                         if( $stack == 0 ) {
2200                                                 // We found it!
2201                                                 $before = substr( $str, 0, $i );
2202                                                 $after = substr( $str, $i + 1 );
2203                                                 wfProfileOut( $fname );
2204                                                 return $i;
2205                                         }
2206                                         // Embedded in a tag; don't break it.
2207                                         break;
2208                                 default:
2209                                         // Skip ahead looking for something interesting
2210                                         $colon = strpos( $str, ':', $i );
2211                                         if( $colon === false ) {
2212                                                 // Nothing else interesting
2213                                                 wfProfileOut( $fname );
2214                                                 return false;
2215                                         }
2216                                         $lt = strpos( $str, '<', $i );
2217                                         if( $stack === 0 ) {
2218                                                 if( $lt === false || $colon < $lt ) {
2219                                                         // We found it!
2220                                                         $before = substr( $str, 0, $colon );
2221                                                         $after = substr( $str, $colon + 1 );
2222                                                         wfProfileOut( $fname );
2223                                                         return $i;
2224                                                 }
2225                                         }
2226                                         if( $lt === false ) {
2227                                                 // Nothing else interesting to find; abort!
2228                                                 // We're nested, but there's no close tags left. Abort!
2229                                                 break 2;
2230                                         }
2231                                         // Skip ahead to next tag start
2232                                         $i = $lt;
2233                                         $state = self::COLON_STATE_TAGSTART;
2234                                 }
2235                                 break;
2236                         case 1: // self::COLON_STATE_TAG:
2237                                 // In a <tag>
2238                                 switch( $c ) {
2239                                 case ">":
2240                                         $stack++;
2241                                         $state = self::COLON_STATE_TEXT;
2242                                         break;
2243                                 case "/":
2244                                         // Slash may be followed by >?
2245                                         $state = self::COLON_STATE_TAGSLASH;
2246                                         break;
2247                                 default:
2248                                         // ignore
2249                                 }
2250                                 break;
2251                         case 2: // self::COLON_STATE_TAGSTART:
2252                                 switch( $c ) {
2253                                 case "/":
2254                                         $state = self::COLON_STATE_CLOSETAG;
2255                                         break;
2256                                 case "!":
2257                                         $state = self::COLON_STATE_COMMENT;
2258                                         break;
2259                                 case ">":
2260                                         // Illegal early close? This shouldn't happen D:
2261                                         $state = self::COLON_STATE_TEXT;
2262                                         break;
2263                                 default:
2264                                         $state = self::COLON_STATE_TAG;
2265                                 }
2266                                 break;
2267                         case 3: // self::COLON_STATE_CLOSETAG:
2268                                 // In a </tag>
2269                                 if( $c == ">" ) {
2270                                         $stack--;
2271                                         if( $stack < 0 ) {
2272                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2273                                                 wfProfileOut( $fname );
2274                                                 return false;
2275                                         }
2276                                         $state = self::COLON_STATE_TEXT;
2277                                 }
2278                                 break;
2279                         case self::COLON_STATE_TAGSLASH:
2280                                 if( $c == ">" ) {
2281                                         // Yes, a self-closed tag <blah/>
2282                                         $state = self::COLON_STATE_TEXT;
2283                                 } else {
2284                                         // Probably we're jumping the gun, and this is an attribute
2285                                         $state = self::COLON_STATE_TAG;
2286                                 }
2287                                 break;
2288                         case 5: // self::COLON_STATE_COMMENT:
2289                                 if( $c == "-" ) {
2290                                         $state = self::COLON_STATE_COMMENTDASH;
2291                                 }
2292                                 break;
2293                         case self::COLON_STATE_COMMENTDASH:
2294                                 if( $c == "-" ) {
2295                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2296                                 } else {
2297                                         $state = self::COLON_STATE_COMMENT;
2298                                 }
2299                                 break;
2300                         case self::COLON_STATE_COMMENTDASHDASH:
2301                                 if( $c == ">" ) {
2302                                         $state = self::COLON_STATE_TEXT;
2303                                 } else {
2304                                         $state = self::COLON_STATE_COMMENT;
2305                                 }
2306                                 break;
2307                         default:
2308                                 throw new MWException( "State machine error in $fname" );
2309                         }
2310                 }
2311                 if( $stack > 0 ) {
2312                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2313                         return false;
2314                 }
2315                 wfProfileOut( $fname );
2316                 return false;
2317         }
2318
2319         /**
2320          * Return value of a magic variable (like PAGENAME)
2321          *
2322          * @private
2323          */
2324         function getVariableValue( $index ) {
2325                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2326
2327                 /**
2328                  * Some of these require message or data lookups and can be
2329                  * expensive to check many times.
2330                  */
2331                 static $varCache = array();
2332                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2333                         if ( isset( $varCache[$index] ) ) {
2334                                 return $varCache[$index];
2335                         }
2336                 }
2337
2338                 $ts = time();
2339                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2340
2341                 # Use the time zone
2342                 global $wgLocaltimezone;
2343                 if ( isset( $wgLocaltimezone ) ) {
2344                         $oldtz = getenv( 'TZ' );
2345                         putenv( 'TZ='.$wgLocaltimezone );
2346                 }
2347
2348                 wfSuppressWarnings(); // E_STRICT system time bitching
2349                 $localTimestamp = date( 'YmdHis', $ts );
2350                 $localMonth = date( 'm', $ts );
2351                 $localMonthName = date( 'n', $ts );
2352                 $localDay = date( 'j', $ts );
2353                 $localDay2 = date( 'd', $ts );
2354                 $localDayOfWeek = date( 'w', $ts );
2355                 $localWeek = date( 'W', $ts );
2356                 $localYear = date( 'Y', $ts );
2357                 $localHour = date( 'H', $ts );
2358                 if ( isset( $wgLocaltimezone ) ) {
2359                         putenv( 'TZ='.$oldtz );
2360                 }
2361                 wfRestoreWarnings();
2362
2363                 switch ( $index ) {
2364                         case 'currentmonth':
2365                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2366                         case 'currentmonthname':
2367                                 return $varCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2368                         case 'currentmonthnamegen':
2369                                 return $varCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2370                         case 'currentmonthabbrev':
2371                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2372                         case 'currentday':
2373                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2374                         case 'currentday2':
2375                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2376                         case 'localmonth':
2377                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2378                         case 'localmonthname':
2379                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2380                         case 'localmonthnamegen':
2381                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2382                         case 'localmonthabbrev':
2383                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2384                         case 'localday':
2385                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2386                         case 'localday2':
2387                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2388                         case 'pagename':
2389                                 return wfEscapeWikiText( $this->mTitle->getText() );
2390                         case 'pagenamee':
2391                                 return $this->mTitle->getPartialURL();
2392                         case 'fullpagename':
2393                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2394                         case 'fullpagenamee':
2395                                 return $this->mTitle->getPrefixedURL();
2396                         case 'subpagename':
2397                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2398                         case 'subpagenamee':
2399                                 return $this->mTitle->getSubpageUrlForm();
2400                         case 'basepagename':
2401                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2402                         case 'basepagenamee':
2403                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2404                         case 'talkpagename':
2405                                 if( $this->mTitle->canTalk() ) {
2406                                         $talkPage = $this->mTitle->getTalkPage();
2407                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2408                                 } else {
2409                                         return '';
2410                                 }
2411                         case 'talkpagenamee':
2412                                 if( $this->mTitle->canTalk() ) {
2413                                         $talkPage = $this->mTitle->getTalkPage();
2414                                         return $talkPage->getPrefixedUrl();
2415                                 } else {
2416                                         return '';
2417                                 }
2418                         case 'subjectpagename':
2419                                 $subjPage = $this->mTitle->getSubjectPage();
2420                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2421                         case 'subjectpagenamee':
2422                                 $subjPage = $this->mTitle->getSubjectPage();
2423                                 return $subjPage->getPrefixedUrl();
2424                         case 'revisionid':
2425                                 // Let the edit saving system know we should parse the page
2426                                 // *after* a revision ID has been assigned.
2427                                 $this->mOutput->setFlag( 'vary-revision' );
2428                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2429                                 return $this->mRevisionId;
2430                         case 'revisionday':
2431                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2432                         case 'revisionday2':
2433                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2434                         case 'revisionmonth':
2435                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2436                         case 'revisionyear':
2437                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2438                         case 'revisiontimestamp':
2439                                 return $this->getRevisionTimestamp();
2440                         case 'namespace':
2441                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2442                         case 'namespacee':
2443                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2444                         case 'talkspace':
2445                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2446                         case 'talkspacee':
2447                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2448                         case 'subjectspace':
2449                                 return $this->mTitle->getSubjectNsText();
2450                         case 'subjectspacee':
2451                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2452                         case 'currentdayname':
2453                                 return $varCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2454                         case 'currentyear':
2455                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2456                         case 'currenttime':
2457                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2458                         case 'currenthour':
2459                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2460                         case 'currentweek':
2461                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2462                                 // int to remove the padding
2463                                 return $varCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2464                         case 'currentdow':
2465                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2466                         case 'localdayname':
2467                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2468                         case 'localyear':
2469                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2470                         case 'localtime':
2471                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2472                         case 'localhour':
2473                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2474                         case 'localweek':
2475                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2476                                 // int to remove the padding
2477                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2478                         case 'localdow':
2479                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2480                         case 'numberofarticles':
2481                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2482                         case 'numberoffiles':
2483                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2484                         case 'numberofusers':
2485                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2486                         case 'numberofpages':
2487                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2488                         case 'numberofadmins':
2489                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::admins() );
2490                         case 'numberofedits':
2491                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::edits() );
2492                         case 'currenttimestamp':
2493                                 return $varCache[$index] = wfTimestampNow();
2494                         case 'localtimestamp':
2495                                 return $varCache[$index] = $localTimestamp;
2496                         case 'currentversion':
2497                                 return $varCache[$index] = SpecialVersion::getVersion();
2498                         case 'sitename':
2499                                 return $wgSitename;
2500                         case 'server':
2501                                 return $wgServer;
2502                         case 'servername':
2503                                 return $wgServerName;
2504                         case 'scriptpath':
2505                                 return $wgScriptPath;
2506                         case 'directionmark':
2507                                 return $wgContLang->getDirMark();
2508                         case 'contentlanguage':
2509                                 global $wgContLanguageCode;
2510                                 return $wgContLanguageCode;
2511                         default:
2512                                 $ret = null;
2513                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2514                                         return $ret;
2515                                 else
2516                                         return null;
2517                 }
2518         }
2519
2520         /**
2521          * initialise the magic variables (like CURRENTMONTHNAME)
2522          *
2523          * @private
2524          */
2525         function initialiseVariables() {
2526                 $fname = 'Parser::initialiseVariables';
2527                 wfProfileIn( $fname );
2528                 $variableIDs = MagicWord::getVariableIDs();
2529
2530                 $this->mVariables = new MagicWordArray( $variableIDs );
2531                 wfProfileOut( $fname );
2532         }
2533
2534         /**
2535          * Parse any parentheses in format ((title|part|part)} and return the document tree
2536          * This is the ghost of replace_variables().
2537          *
2538          * @param string $text The text to parse
2539          * @private
2540          */
2541         function preprocessToDom ( $text ) {
2542                 wfProfileIn( __METHOD__ );
2543                 wfProfileIn( __METHOD__.'-makexml' );
2544
2545                 static $msgRules, $normalRules;
2546                 if ( !$msgRules ) {
2547                         $msgRules = array(
2548                                 '{' => array(
2549                                         'end' => '}',
2550                                         'names' => array(
2551                                                 2 => 'template',
2552                                         ),
2553                                         'min' => 2,
2554                                         'max' => 2,
2555                                 ),
2556                                 '[' => array(
2557                                         'end' => ']',
2558                                         'names' => array( 2 => null ),
2559                                         'min' => 2,
2560                                         'max' => 2,
2561                                 )
2562                         );
2563                         $normalRules = array(
2564                                 '{' => array(
2565                                         'end' => '}',
2566                                         'names' => array(
2567                                                 2 => 'template',
2568                                                 3 => 'tplarg',
2569                                         ),
2570                                         'min' => 2,
2571                                         'max' => 3,
2572                                 ),
2573                                 '[' => array(
2574                                         'end' => ']',
2575                                         'names' => array( 2 => null ),
2576                                         'min' => 2,
2577                                         'max' => 2,
2578                                 )
2579                         );
2580                 }
2581                 if ( $this->ot['msg'] ) {
2582                         $rules = $msgRules;
2583                 } else {
2584                         $rules = $normalRules;
2585                 }
2586
2587                 $extElements = implode( '|', $this->getStripList() );
2588                 // Use "A" modifier (anchored) instead of "^", because ^ doesn't work with an offset
2589                 $extElementsRegex = "/($extElements)(?:\s|\/>|>)|(!--)/iA";
2590
2591                 $stack = array();      # Stack of unclosed parentheses
2592                 $stackIndex = -1;      # Stack read pointer
2593
2594                 $searchBase = implode( '', array_keys( $rules ) ) . '<';
2595
2596                 $i = -1; # Input pointer, starts out pointing to a pseudo-newline before the start
2597                 $topAccum = '<root>';      # Top level text accumulator
2598                 $accum =& $topAccum;            # Current text accumulator
2599                 $findEquals = false;            # True to find equals signs in arguments
2600                 $findHeading = false;           # True to look at LF characters for possible headings
2601                 $findPipe = false;              # True to take notice of pipe characters
2602                 $headingIndex = 1;
2603                 $noMoreGT = false;         # True if there are no more greater-than (>) signs right of $i
2604
2605                 while ( $i < strlen( $text ) ) {
2606                         if ( $i == -1 ) {
2607                                 $found = 'line-start';
2608                                 $curChar = '';
2609                         } else {
2610                                 # Find next opening brace, closing brace or pipe
2611                                 $search = $searchBase;
2612                                 if ( $stackIndex == -1 ) {
2613                                         $currentClosing = '';
2614                                         // Look for headings only at the top stack level
2615                                         // Among other things, this resolves the ambiguity between =
2616                                         // for headings and = for template arguments
2617                                         $search .= "\n";
2618                                 } else {
2619                                         $currentClosing = $stack[$stackIndex]['close'];
2620                                         $search .= $currentClosing;
2621                                 }
2622                                 if ( $findPipe ) {
2623                                         $search .= '|';
2624                                 }
2625                                 if ( $findEquals ) {
2626                                         $search .= '=';
2627                                 }
2628                                 $rule = null;
2629                                 # Output literal section, advance input counter
2630                                 $literalLength = strcspn( $text, $search, $i );
2631                                 if ( $literalLength > 0 ) {
2632                                         $accum .= htmlspecialchars( substr( $text, $i, $literalLength ) );
2633                                         $i += $literalLength;
2634                                 }
2635                                 if ( $i >= strlen( $text ) ) {
2636                                         if ( $currentClosing == "\n" ) {
2637                                                 // Do a past-the-end run to finish off the heading
2638                                                 $curChar = '';
2639                                                 $found = 'line-end';
2640                                         } else {
2641                                                 # All done
2642                                                 break;
2643                                         }
2644                                 } else {
2645                                         $curChar = $text[$i];
2646                                         if ( $curChar == '|' ) {
2647                                                 $found = 'pipe';
2648                                         } elseif ( $curChar == '=' ) {
2649                                                 $found = 'equals';
2650                                         } elseif ( $curChar == '<' ) {
2651                                                 $found = 'angle';
2652                                         } elseif ( $curChar == "\n" ) {
2653                                                 if ( $stackIndex == -1 ) {
2654                                                         $found = 'line-start';
2655                                                 } else {
2656                                                         $found = 'line-end';
2657                                                 }
2658                                         } elseif ( $curChar == $currentClosing ) {
2659                                                 $found = 'close';
2660                                         } elseif ( isset( $rules[$curChar] ) ) {
2661                                                 $found = 'open';
2662                                                 $rule = $rules[$curChar];
2663                                         } else {
2664                                                 # Some versions of PHP have a strcspn which stops on null characters
2665                                                 # Ignore and continue
2666                                                 ++$i;
2667                                                 continue;
2668                                         }
2669                                 }
2670                         }
2671
2672                         if ( $found == 'angle' ) {
2673                                 $matches = false;
2674                                 // Determine element name
2675                                 if ( !preg_match( $extElementsRegex, $text, $matches, 0, $i + 1 ) ) {
2676                                         // Element name missing or not listed
2677                                         $accum .= '&lt;';
2678                                         ++$i;
2679                                         continue;
2680                                 }
2681                                 // Handle comments
2682                                 if ( isset( $matches[2] ) && $matches[2] == '!--' ) {
2683                                         // HTML comment, scan to end
2684                                         $endpos = strpos( $text, '-->', $i + 4 );
2685                                         if ( $endpos === false ) {
2686                                                 // Unclosed comment in input, runs to end
2687                                                 $accum .= htmlspecialchars( substr( $text, $i ) );
2688                                                 if ( $this->ot['html'] ) {
2689                                                         // Close it so later stripping can remove it
2690                                                         $accum .= htmlspecialchars( '-->' );
2691                                                 }
2692                                                 $i = strlen( $text );
2693                                                 continue;
2694                                         }
2695                                         $accum .= htmlspecialchars( substr( $text, $i, $endpos - $i + 3 ) );
2696                                         #$inner = substr( $text, $i + 4, $endpos - $i - 4 );
2697                                         #$accum .= '<ext><name>!--</name><inner>' . htmlspecialchars( $inner ) . '</inner></ext>';
2698                                         $i = $endpos + 3;
2699                                         continue;
2700                                 }
2701                                 $name = $matches[1];
2702                                 $attrStart = $i + strlen( $name ) + 1;
2703
2704                                 // Find end of tag
2705                                 $tagEndPos = $noMoreGT ? false : strpos( $text, '>', $attrStart );
2706                                 if ( $tagEndPos === false ) {
2707                                         // Infinite backtrack
2708                                         // Disable tag search to prevent worst-case O(N^2) performance
2709                                         $noMoreGT = true;
2710                                         $accum .= '&lt;';
2711                                         ++$i;
2712                                         continue;
2713                                 }
2714                                 if ( $text[$tagEndPos-1] == '/' ) {
2715                                         $attrEnd = $tagEndPos - 1;
2716                                         $inner = null;
2717                                         $i = $tagEndPos + 1;
2718                                         $close = '';
2719                                 } else {
2720                                         $attrEnd = $tagEndPos;
2721                                         // Find closing tag
2722                                         if ( preg_match( "/<\/$name\s*>/i", $text, $matches, PREG_OFFSET_CAPTURE, $tagEndPos + 1 ) ) {
2723                                                 $inner = substr( $text, $tagEndPos + 1, $matches[0][1] - $tagEndPos - 1 );
2724                                                 $i = $matches[0][1] + strlen( $matches[0][0] );
2725                                                 $close = '<close>' . htmlspecialchars( $matches[0][0] ) . '</close>';
2726                                         } else {
2727                                                 // No end tag -- let it run out to the end of the text.
2728                                                 $inner = substr( $text, $tagEndPos + 1 );
2729                                                 $i = strlen( $text );
2730                                                 $close = '';
2731                                         }
2732                                 }
2733                                 $accum .= '<ext>';
2734                                 if ( $attrEnd <= $attrStart ) {
2735                                         $attr = '';
2736                                 } else {
2737                                         $attr = substr( $text, $attrStart, $attrEnd - $attrStart );
2738                                 }
2739                                 $accum .= '<name>' . htmlspecialchars( $name ) . '</name>' .
2740                                         // Note that the attr element contains the whitespace between name and attribute,
2741                                         // this is necessary for precise reconstruction during pre-save transform.
2742                                         '<attr>' . htmlspecialchars( $attr ) . '</attr>';
2743                                 if ( $inner !== null ) {
2744                                         $accum .= '<inner>' . htmlspecialchars( $inner ) . '</inner>';
2745                                 }
2746                                 $accum .= $close . '</ext>';
2747                         }
2748
2749                         elseif ( $found == 'line-start' ) {
2750                                 // Is this the start of a heading?
2751                                 // Line break belongs before the heading element in any case
2752                                 $accum .= $curChar;
2753                                 $i++;
2754
2755                                 $count = strspn( $text, '=', $i, 6 );
2756                                 if ( $count > 0 ) {
2757                                         $piece = array(
2758                                                 'open' => "\n",
2759                                                 'close' => "\n",
2760                                                 'parts' => array( str_repeat( '=', $count ) ),
2761                                                 'count' => $count );
2762                                         $stack[++$stackIndex] = $piece;
2763                                         $i += $count;
2764                                         $accum =& $stack[$stackIndex]['parts'][0];
2765                                         $findPipe = false;
2766                                 }
2767                         }
2768
2769                         elseif ( $found == 'line-end' ) {
2770                                 $piece = $stack[$stackIndex];
2771                                 // A heading must be open, otherwise \n wouldn't have been in the search list
2772                                 assert( $piece['open'] == "\n" );
2773                                 assert( $stackIndex == 0 );
2774                                 // Search back through the accumulator to see if it has a proper close
2775                                 // No efficient way to do this in PHP AFAICT: strrev, PCRE search with $ anchor
2776                                 // and rtrim are all O(N) in total size. Optimal would be O(N) in trailing
2777                                 // whitespace size only.
2778                                 $m = false;
2779                                 $count = $piece['count'];
2780                                 if ( preg_match( "/(={{$count}})\s*$/", $accum, $m, 0, $count ) ) {
2781                                         // Found match, output <h>
2782                                         $count = min( strlen( $m[1] ), $count );
2783                                         $element = "<h level=\"$count\" i=\"$headingIndex\">$accum</h>";
2784                                         $headingIndex++;
2785                                 } else {
2786                                         // No match, no <h>, just pass down the inner text
2787                                         $element = $accum;
2788                                 }
2789                                 // Unwind the stack
2790                                 // Headings can only occur on the top level, so this is a bit simpler than the
2791                                 // generic stack unwind operation in the close case
2792                                 unset( $stack[$stackIndex--] );
2793                                 $accum =& $topAccum;
2794                                 $findEquals = false;
2795                                 $findPipe = false;
2796
2797                                 // Append the result to the enclosing accumulator
2798                                 $accum .= $element;
2799                                 // Note that we do NOT increment the input pointer.
2800                                 // This is because the closing linebreak could be the opening linebreak of
2801                                 // another heading. Infinite loops are avoided because the next iteration MUST
2802                                 // hit the heading open case above, which unconditionally increments the
2803                                 // input pointer.
2804                         }
2805
2806                         elseif ( $found == 'open' ) {
2807                                 # count opening brace characters
2808                                 $count = strspn( $text, $curChar, $i );
2809
2810                                 # we need to add to stack only if opening brace count is enough for one of the rules
2811                                 if ( $count >= $rule['min'] ) {
2812                                         # Add it to the stack
2813                                         $piece = array(
2814                                                 'open' => $curChar,
2815                                                 'close' => $rule['end'],
2816                                                 'count' => $count,
2817                                                 'parts' => array( '' ),
2818                                                 'eqpos' => array(),
2819                                                 'lineStart' => ($i > 0 && $text[$i-1] == "\n"),
2820                                         );
2821
2822                                         $stackIndex ++;
2823                                         $stack[$stackIndex] = $piece;
2824                                         $accum =& $stack[$stackIndex]['parts'][0];
2825                                         $findEquals = false;
2826                                         $findPipe = true;
2827                                 } else {
2828                                         # Add literal brace(s)
2829                                         $accum .= htmlspecialchars( str_repeat( $curChar, $count ) );
2830                                 }
2831                                 $i += $count;
2832                         }
2833
2834                         elseif ( $found == 'close' ) {
2835                                 $piece = $stack[$stackIndex];
2836                                 # lets check if there are enough characters for closing brace
2837                                 $maxCount = $piece['count'];
2838                                 $count = strspn( $text, $curChar, $i, $maxCount );
2839
2840                                 # check for maximum matching characters (if there are 5 closing
2841                                 # characters, we will probably need only 3 - depending on the rules)
2842                                 $matchingCount = 0;
2843                                 $rule = $rules[$piece['open']];
2844                                 if ( $count > $rule['max'] ) {
2845                                         # The specified maximum exists in the callback array, unless the caller
2846                                         # has made an error
2847                                         $matchingCount = $rule['max'];
2848                                 } else {
2849                                         # Count is less than the maximum
2850                                         # Skip any gaps in the callback array to find the true largest match
2851                                         # Need to use array_key_exists not isset because the callback can be null
2852                                         $matchingCount = $count;
2853                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $rule['names'] ) ) {
2854                                                 --$matchingCount;
2855                                         }
2856                                 }
2857
2858                                 if ($matchingCount <= 0) {
2859                                         # No matching element found in callback array
2860                                         # Output a literal closing brace and continue
2861                                         $accum .= htmlspecialchars( str_repeat( $curChar, $count ) );
2862                                         $i += $count;
2863                                         continue;
2864                                 }
2865                                 $name = $rule['names'][$matchingCount];
2866                                 if ( $name === null ) {
2867                                         // No element, just literal text
2868                                         $element = str_repeat( $piece['open'], $matchingCount ) .
2869                                                 implode( '|', $piece['parts'] ) .
2870                                                 str_repeat( $rule['end'], $matchingCount );
2871                                 } else {
2872                                         # Create XML element
2873                                         # Note: $parts is already XML, does not need to be encoded further
2874                                         $parts = $piece['parts'];
2875                                         $title = $parts[0];
2876                                         unset( $parts[0] );
2877
2878                                         # The invocation is at the start of the line if lineStart is set in
2879                                         # the stack, and all opening brackets are used up.
2880                                         if ( $maxCount == $matchingCount && !empty( $piece['lineStart'] ) ) {
2881                                                 $attr = ' lineStart="1"';
2882                                         } else {
2883                                                 $attr = '';
2884                                         }
2885
2886                                         $element = "<$name$attr>";
2887                                         $element .= "<title>$title</title>";
2888                                         $argIndex = 1;
2889                                         foreach ( $parts as $partIndex => $part ) {
2890                                                 if ( isset( $piece['eqpos'][$partIndex] ) ) {
2891                                                         $eqpos = $piece['eqpos'][$partIndex];
2892                                                         list( $ws1, $argName, $ws2 ) = self::splitWhitespace( substr( $part, 0, $eqpos ) );
2893                                                         list( $ws3, $argValue, $ws4 ) = self::splitWhitespace( substr( $part, $eqpos + 1 ) );
2894                                                         $element .= "<part>$ws1<name>$argName</name>$ws2=$ws3<value>$argValue</value>$ws4</part>";
2895                                                 } else {
2896                                                         list( $ws1, $value, $ws2 ) = self::splitWhitespace( $part );
2897                                                         $element .= "<part>$ws1<name index=\"$argIndex\" /><value>$value</value>$ws2</part>";
2898                                                         $argIndex++;
2899                                                 }
2900                                         }
2901                                         $element .= "</$name>";
2902                                 }
2903
2904                                 # Advance input pointer
2905                                 $i += $matchingCount;
2906
2907                                 # Unwind the stack
2908                                 unset( $stack[$stackIndex--] );
2909                                 if ( $stackIndex == -1 ) {
2910                                         $accum =& $topAccum;
2911                                         $findEquals = false;
2912                                         $findPipe = false;
2913                                 } else {
2914                                         $partCount = count( $stack[$stackIndex]['parts'] );
2915                                         $accum =& $stack[$stackIndex]['parts'][$partCount - 1];
2916                                         $findPipe = $stack[$stackIndex]['open'] != "\n";
2917                                         $findEquals = $findPipe && $partCount > 1
2918                                                 && !isset( $stack[$stackIndex]['eqpos'][$partCount - 1] );
2919                                 }
2920
2921                                 # Re-add the old stack element if it still has unmatched opening characters remaining
2922                                 if ($matchingCount < $piece['count']) {
2923                                         $piece['parts'] = array( '' );
2924                                         $piece['count'] -= $matchingCount;
2925                                         $piece['eqpos'] = array();
2926                                         # do we still qualify for any callback with remaining count?
2927                                         $names = $rules[$piece['open']]['names'];
2928                                         $skippedBraces = 0;
2929                                         $enclosingAccum =& $accum;
2930                                         while ( $piece['count'] ) {
2931                                                 if ( array_key_exists( $piece['count'], $names ) ) {
2932                                                         $stackIndex++;
2933                                                         $stack[$stackIndex] = $piece;
2934                                                         $accum =& $stack[$stackIndex]['parts'][0];
2935                                                         $findEquals = true;
2936                                                         $findPipe = true;
2937                                                         break;
2938                                                 }
2939                                                 --$piece['count'];
2940                                                 $skippedBraces ++;
2941                                         }
2942                                         $enclosingAccum .= str_repeat( $piece['open'], $skippedBraces );
2943                                 }
2944
2945                                 # Add XML element to the enclosing accumulator
2946                                 $accum .= $element;
2947                         }
2948
2949                         elseif ( $found == 'pipe' ) {
2950                                 $stack[$stackIndex]['parts'][] = '';
2951                                 $partsCount = count( $stack[$stackIndex]['parts'] );
2952                                 $accum =& $stack[$stackIndex]['parts'][$partsCount - 1];
2953                                 $findEquals = true;
2954                                 ++$i;
2955                         }
2956
2957                         elseif ( $found == 'equals' ) {
2958                                 $findEquals = false;
2959                                 $partsCount = count( $stack[$stackIndex]['parts'] );
2960                                 $stack[$stackIndex]['eqpos'][$partsCount - 1] = strlen( $accum );
2961                                 $accum .= '=';
2962                                 ++$i;
2963                         }
2964                 }
2965
2966                 # Output any remaining unclosed brackets
2967                 foreach ( $stack as $piece ) {
2968                         if ( $piece['open'] == "\n" ) {
2969                                 $topAccum .= $piece['parts'][0];
2970                         } else {
2971                                 $topAccum .= str_repeat( $piece['open'], $piece['count'] ) . implode( '|', $piece['parts'] );
2972                         }
2973                 }
2974                 $topAccum .= '</root>';
2975
2976                 wfProfileOut( __METHOD__.'-makexml' );
2977                 wfProfileIn( __METHOD__.'-loadXML' );
2978                 $dom = new DOMDocument;
2979                 if ( !$dom->loadXML( $topAccum ) ) {
2980                         throw new MWException( __METHOD__.' generated invalid XML' );
2981                 }
2982                 wfProfileOut( __METHOD__.'-loadXML' );
2983                 wfProfileOut( __METHOD__ );
2984                 return $dom;
2985         }
2986
2987         /*
2988          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2989          */
2990         public static function splitWhitespace( $s ) {
2991                 $ltrimmed = ltrim( $s );
2992                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2993                 $trimmed = rtrim( $ltrimmed );
2994                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2995                 if ( $diff > 0 ) {
2996                         $w2 = substr( $ltrimmed, -$diff );
2997                 } else {
2998                         $w2 = '';
2999                 }
3000                 return array( $w1, $trimmed, $w2 );
3001         }
3002
3003         /**
3004          * Replace magic variables, templates, and template arguments
3005          * with the appropriate text. Templates are substituted recursively,
3006          * taking care to avoid infinite loops.
3007          *
3008          * Note that the substitution depends on value of $mOutputType:
3009          *  OT_WIKI: only {{subst:}} templates
3010          *  OT_MSG: only magic variables
3011          *  OT_HTML: all templates and magic variables
3012          *
3013          * @param string $tex The text to transform
3014          * @param PPFrame $frame Object describing the arguments passed to the template
3015          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
3016          * @private
3017          */
3018         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
3019                 # Prevent too big inclusions
3020                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
3021                         return $text;
3022                 }
3023
3024                 $fname = __METHOD__;
3025                 wfProfileIn( $fname );
3026
3027                 if ( $frame === false ) {
3028                         $frame = new PPFrame( $this );
3029                 } elseif ( !( $frame instanceof PPFrame ) ) {
3030                         throw new MWException( __METHOD__ . ' called using the old argument format' );
3031                 }
3032
3033                 $dom = $this->preprocessToDom( $text );
3034                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
3035                 $text = $frame->expand( $dom, 0, $flags );
3036
3037                 wfProfileOut( $fname );
3038                 return $text;
3039         }
3040
3041         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
3042         static function createAssocArgs( $args ) {
3043                 $assocArgs = array();
3044                 $index = 1;
3045                 foreach( $args as $arg ) {
3046                         $eqpos = strpos( $arg, '=' );
3047                         if ( $eqpos === false ) {
3048                                 $assocArgs[$index++] = $arg;
3049                         } else {
3050                                 $name = trim( substr( $arg, 0, $eqpos ) );
3051                                 $value = trim( substr( $arg, $eqpos+1 ) );
3052                                 if ( $value === false ) {
3053                                         $value = '';
3054                                 }
3055                                 if ( $name !== false ) {
3056                                         $assocArgs[$name] = $value;
3057                                 }
3058                         }
3059                 }
3060
3061                 return $assocArgs;
3062         }
3063
3064         /**
3065          * Return the text of a template, after recursively
3066          * replacing any variables or templates within the template.
3067          *
3068          * @param array $piece The parts of the template
3069          *  $piece['text']: matched text
3070          *  $piece['title']: the title, i.e. the part before the |
3071          *  $piece['parts']: the parameter array
3072          * @param PPFrame The current frame, contains template arguments
3073          * @return string the text of the template
3074          * @private
3075          */
3076         function braceSubstitution( $piece, $frame ) {
3077                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
3078                 $fname = __METHOD__;
3079                 wfProfileIn( $fname );
3080                 wfProfileIn( __METHOD__.'-setup' );
3081
3082                 # Flags
3083                 $found = false;             # $text has been filled
3084                 $nowiki = false;            # wiki markup in $text should be escaped
3085                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
3086                 $noargs = false;            # Don't replace triple-brace arguments in $text
3087                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
3088                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
3089                 $isDOM = false;             # $text is a DOM node needing expansion
3090
3091                 # Title object, where $text came from
3092                 $title = NULL;
3093
3094                 # $part1 is the bit before the first |, and must contain only title characters.
3095                 # Various prefixes will be stripped from it later.
3096                 $titleWithSpaces = $frame->expand( $piece['title'] );
3097                 $part1 = trim( $titleWithSpaces );
3098                 $titleText = false;
3099
3100                 # Original title text preserved for various purposes
3101                 $originalTitle = $part1;
3102
3103                 # $args is a list of argument nodes, starting from index 0, not including $part1
3104                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
3105                 wfProfileOut( __METHOD__.'-setup' );
3106
3107                 # SUBST
3108                 wfProfileIn( __METHOD__.'-modifiers' );
3109                 if ( !$found ) {
3110                         $mwSubst =& MagicWord::get( 'subst' );
3111                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
3112                                 # One of two possibilities is true:
3113                                 # 1) Found SUBST but not in the PST phase
3114                                 # 2) Didn't find SUBST and in the PST phase
3115                                 # In either case, return without further processing
3116                                 $text = '{{' . $frame->implode( '|', $titleWithSpaces, $args ) . '}}';
3117                                 $found = true;
3118                                 $noparse = true;
3119                                 $noargs = true;
3120                         }
3121                 }
3122
3123                 # Variables
3124                 if ( !$found && $args->length == 0 ) {
3125                         $id = $this->mVariables->matchStartToEnd( $part1 );
3126                         if ( $id !== false ) {
3127                                 $text = $this->getVariableValue( $id );
3128                                 $this->mOutput->mContainsOldMagic = true;
3129                                 $found = true;
3130                                 $noparse = true;
3131                                 $noargs = true;
3132                         }
3133                 }
3134
3135                 # MSG, MSGNW and RAW
3136                 if ( !$found ) {
3137                         # Check for MSGNW:
3138                         $mwMsgnw =& MagicWord::get( 'msgnw' );
3139                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
3140                                 $nowiki = true;
3141                         } else {
3142                                 # Remove obsolete MSG:
3143                                 $mwMsg =& MagicWord::get( 'msg' );
3144                                 $mwMsg->matchStartAndRemove( $part1 );
3145                         }
3146
3147                         # Check for RAW:
3148                         $mwRaw =& MagicWord::get( 'raw' );
3149                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
3150                                 $forceRawInterwiki = true;
3151                         }
3152                 }
3153                 wfProfileOut( __METHOD__.'-modifiers' );
3154
3155                 # Save path level before recursing into functions & templates.
3156                 $lastPathLevel = $this->mTemplatePath;
3157
3158                 # Parser functions
3159                 if ( !$found ) {
3160                         wfProfileIn( __METHOD__ . '-pfunc' );
3161
3162                         $colonPos = strpos( $part1, ':' );
3163                         if ( $colonPos !== false ) {
3164                                 # Case sensitive functions
3165                                 $function = substr( $part1, 0, $colonPos );
3166                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
3167                                         $function = $this->mFunctionSynonyms[1][$function];
3168                                 } else {
3169                                         # Case insensitive functions
3170                                         $function = strtolower( $function );
3171                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
3172                                                 $function = $this->mFunctionSynonyms[0][$function];
3173                                         } else {
3174                                                 $function = false;
3175                                         }
3176                                 }
3177                                 if ( $function ) {
3178                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
3179                                         $initialArgs = array( &$this );
3180                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
3181                                         if ( $flags & SFH_OBJECT_ARGS ) {
3182                                                 # Add a frame parameter, and pass the arguments as an array
3183                                                 $allArgs = $initialArgs;
3184                                                 $allArgs[] = $frame;
3185                                                 foreach ( $args as $arg ) {
3186                                                         $funcArgs[] = $arg;
3187                                                 }
3188                                                 $allArgs[] = $funcArgs;
3189                                         } else {
3190                                                 # Convert arguments to plain text
3191                                                 foreach ( $args as $arg ) {
3192                                                         $funcArgs[] = trim( $frame->expand( $arg ) );
3193                                                 }
3194                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
3195                                         }
3196
3197                                         $result = call_user_func_array( $callback, $allArgs );
3198                                         $found = true;
3199
3200                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
3201                                         $noargs = true;
3202                                         $noparse = true;
3203
3204                                         if ( is_array( $result ) ) {
3205                                                 if ( isset( $result[0] ) ) {
3206                                                         $text = $result[0];
3207                                                         unset( $result[0] );
3208                                                 }
3209
3210                                                 // Extract flags into the local scope
3211                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
3212                                                 extract( $result );
3213                                         } else {
3214                                                 $text = $result;
3215                                         }
3216                                 }
3217                         }
3218                         wfProfileOut( __METHOD__ . '-pfunc' );
3219                 }
3220
3221                 # Finish mangling title and then check for loops.
3222                 # Set $title to a Title object and $titleText to the PDBK
3223                 if ( !$found ) {
3224                         $ns = NS_TEMPLATE;
3225                         # Split the title into page and subpage
3226                         $subpage = '';
3227                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3228                         if ($subpage !== '') {
3229                                 $ns = $this->mTitle->getNamespace();
3230                         }
3231                         $title = Title::newFromText( $part1, $ns );
3232                         if ( $title ) {
3233                                 $titleText = $title->getPrefixedText();
3234                                 # Check for language variants if the template is not found
3235                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
3236                                         $wgContLang->findVariantLink($part1, $title);
3237                                 }
3238                                 # Do infinite loop check
3239                                 if ( isset( $this->mTemplatePath[$titleText] ) ) {
3240                                         $noparse = true;
3241                                         $noargs = true;
3242                                         $found = true;
3243                                         $text = "[[$part1]]" . $this->insertStripItem( '<!-- WARNING: template loop detected -->' );
3244                                         wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
3245                                 }
3246                         }
3247                 }
3248
3249                 # Load from database
3250                 if ( !$found && $title ) {
3251                         wfProfileIn( __METHOD__ . '-loadtpl' );
3252                         if ( !$title->isExternal() ) {
3253                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
3254                                         $text = SpecialPage::capturePath( $title );
3255                                         if ( is_string( $text ) ) {
3256                                                 $found = true;
3257                                                 $noparse = true;
3258                                                 $noargs = true;
3259                                                 $isHTML = true;
3260                                                 $this->disableCache();
3261                                         }
3262                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3263                                         $found = false; //access denied
3264                                         wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
3265                                 } else {
3266                                         list( $text, $title ) = $this->getTemplateDom( $title );
3267                                         if ( $text !== false ) {
3268                                                 $found = true;
3269                                                 $isDOM = true;
3270                                         }
3271                                 }
3272
3273                                 # If the title is valid but undisplayable, make a link to it
3274                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3275                                         $text = "[[:$titleText]]";
3276                                         $found = true;
3277                                 }
3278                         } elseif ( $title->isTrans() ) {
3279                                 // Interwiki transclusion
3280                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
3281                                         $text = $this->interwikiTransclude( $title, 'render' );
3282                                         $isHTML = true;
3283                                         $noparse = true;
3284                                 } else {
3285                                         $text = $this->interwikiTransclude( $title, 'raw' );
3286                                 }
3287                                 $found = true;
3288                         }
3289                         wfProfileOut( __METHOD__ . '-loadtpl' );
3290                 }
3291
3292                 # Recursive parsing, escaping and link table handling
3293                 # Only for HTML output
3294                 if ( $nowiki && $found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3295                         if ( $isDOM ) {
3296                                 $text = $frame->expand( $text );
3297                         }
3298                         $text = wfEscapeWikiText( $text );
3299                 } elseif ( !$this->ot['msg'] && $found ) {
3300                         if ( $noargs ) {
3301                                 $newFrame = $frame->newChild();
3302                         } else {
3303                                 # Clean up argument array
3304                                 $newFrame = $frame->newChild( $args, $title );
3305                                 # Add a new element to the templace recursion path
3306                                 $this->mTemplatePath[$titleText] = 1;
3307                         }
3308
3309                         if ( !$noparse ) {
3310                                 if ( $isDOM ) {
3311                                         if ( $titleText !== false && count( $newFrame->args ) == 0 ) {
3312                                                 # Expansion is eligible for the empty-frame cache
3313                                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3314                                                         $text = $this->mTplExpandCache[$titleText];
3315                                                 } else {
3316                                                         $text = $newFrame->expand( $text );
3317                                                         $this->mTplExpandCache[$titleText] = $text;
3318                                                 }
3319                                         } else {
3320                                                 $text = $newFrame->expand( $text );
3321                                         }
3322                                 } else {
3323                                         $text = $this->replaceVariables( $text, $newFrame );
3324                                 }
3325
3326                                 # strip woz 'ere 2004-07
3327
3328                                 # Bug 529: if the template begins with a table or block-level
3329                                 # element, it should be treated as beginning a new line.
3330                                 # This behaviour is somewhat controversial.
3331                                 if (!$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3332                                         $text = "\n" . $text;
3333                                 }
3334                         } elseif ( !$noargs ) {
3335                                 # $noparse and !$noargs
3336                                 # Just replace the arguments, not any double-brace items
3337                                 # This is used for rendered interwiki transclusion
3338                                 if ( $isDOM ) {
3339                                         $text = $newFrame->expand( $text, 0, PPFrame::NO_TEMPLATES );
3340                                 } else {
3341                                         $text = $this->replaceVariables( $text, $newFrame, true );
3342                                 }
3343                         } elseif ( $isDOM ) {
3344                                 $text = $frame->expand( $text );
3345                         }
3346                 } elseif ( $isDOM ) {
3347                         $text = $frame->expand( $text, 0, PPFrame::NO_TEMPLATES | PPFrame::NO_ARGS );
3348                 }
3349
3350                 # Prune lower levels off the recursion check path
3351                 $this->mTemplatePath = $lastPathLevel;
3352
3353                 if ( $found && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3354                         # Error, oversize inclusion
3355                         $text = "[[$originalTitle]]" .
3356                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3357                         $noparse = true;
3358                         $noargs = true;
3359                 }
3360
3361                 if ( !$found ) {
3362                         wfProfileOut( $fname );
3363                         return '{{' . $frame->implode( '|', $titleWithSpaces, $args ) . '}}';
3364                 } else {
3365                         wfProfileIn( __METHOD__ . '-placeholders' );
3366                         if ( $isHTML ) {
3367                                 # Replace raw HTML by a placeholder
3368                                 # Add a blank line preceding, to prevent it from mucking up
3369                                 # immediately preceding headings
3370                                 $text = "\n\n" . $this->insertStripItem( $text );
3371                         }
3372                         wfProfileOut( __METHOD__ . '-placeholders' );
3373                 }
3374
3375                 # Prune lower levels off the recursion check path
3376                 $this->mTemplatePath = $lastPathLevel;
3377
3378                 if ( !$found ) {
3379                         wfProfileOut( $fname );
3380                         return '{{' . $frame->implode( '|', $titleWithSpaces, $args ) . '}}';
3381                 } else {
3382                         wfProfileOut( $fname );
3383                         return $text;
3384                 }
3385         }
3386
3387         /**
3388          * Get the semi-parsed DOM representation of a template with a given title,
3389          * and its redirect destination title. Cached.
3390          */
3391         function getTemplateDom( $title ) {
3392                 $cacheTitle = $title;
3393                 $titleText = $title->getPrefixedDBkey();
3394
3395                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3396                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3397                         $title = Title::makeTitle( $ns, $dbk );
3398                         $titleText = $title->getPrefixedDBkey();
3399                 }
3400                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3401                         return array( $this->mTplDomCache[$titleText], $title );
3402                 }
3403
3404                 // Cache miss, go to the database
3405                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3406
3407                 if ( $text === false ) {
3408                         $this->mTplDomCache[$titleText] = false;
3409                         return array( false, $title );
3410                 }
3411
3412                 # If there are any <onlyinclude> tags, only include them
3413                 if ( !$this->ot['msg'] ) {
3414                         if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
3415                                 $replacer = new OnlyIncludeReplacer;
3416                                 StringUtils::delimiterReplaceCallback( '<onlyinclude>', '</onlyinclude>',
3417                                         array( &$replacer, 'replace' ), $text );
3418                                 $text = $replacer->output;
3419                         }
3420                         # Remove <noinclude> sections and <includeonly> tags
3421                         $text = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $text );
3422                         $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
3423                 }
3424
3425                 $dom = $this->preprocessToDom( $text );
3426
3427                 $this->mTplDomCache[ $titleText ] = $dom;
3428
3429                 if (! $title->equals($cacheTitle)) {
3430                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3431                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3432                 }
3433
3434                 return array( $dom, $title );
3435         }
3436
3437         /**
3438          * Fetch the unparsed text of a template and register a reference to it.
3439          */
3440         function fetchTemplateAndTitle( $title ) {
3441                 $templateCb = $this->mOptions->getTemplateCallback();
3442                 $stuff = call_user_func( $templateCb, $title );
3443                 $text = $stuff['text'];
3444                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3445                 if ( isset( $stuff['deps'] ) ) {
3446                         foreach ( $stuff['deps'] as $dep ) {
3447                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3448                         }
3449                 }
3450                 return array($text,$finalTitle);
3451         }
3452
3453         function fetchTemplate( $title ) {
3454                 $rv = $this->fetchTemplateAndTitle($title);
3455                 return $rv[0];
3456         }
3457
3458         /**
3459          * Static function to get a template
3460          * Can be overridden via ParserOptions::setTemplateCallback().
3461          */
3462         static function statelessFetchTemplate( $title ) {
3463                 $text = $skip = false;
3464                 $finalTitle = $title;
3465                 $deps = array();
3466
3467                 // Loop to fetch the article, with up to 1 redirect
3468                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3469                         # Give extensions a chance to select the revision instead
3470                         $id = false; // Assume current
3471                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( false, &$title, &$skip, &$id ) );
3472
3473                         if( $skip ) {
3474                                 $text = false;
3475                                 $deps[] = array(
3476                                         'title' => $title,
3477                                         'page_id' => $title->getArticleID(),
3478                                         'rev_id' => null );
3479                                 break;
3480                         }
3481                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3482                         $rev_id = $rev ? $rev->getId() : 0;
3483
3484                         $deps[] = array(
3485                                 'title' => $title,
3486                                 'page_id' => $title->getArticleID(),
3487                                 'rev_id' => $rev_id );
3488
3489                         if( $rev ) {
3490                                 $text = $rev->getText();
3491                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3492                                 global $wgLang;
3493                                 $message = $wgLang->lcfirst( $title->getText() );
3494                                 $text = wfMsgForContentNoTrans( $message );
3495                                 if( wfEmptyMsg( $message, $text ) ) {
3496                                         $text = false;
3497                                         break;
3498                                 }
3499                         } else {
3500                                 break;
3501                         }
3502                         if ( $text === false ) {
3503                                 break;
3504                         }
3505                         // Redirect?
3506                         $finalTitle = $title;
3507                         $title = Title::newFromRedirect( $text );
3508                 }
3509                 return array(
3510                         'text' => $text,
3511                         'finalTitle' => $finalTitle,
3512                         'deps' => $deps );
3513         }
3514
3515         /**
3516          * Transclude an interwiki link.
3517          */
3518         function interwikiTransclude( $title, $action ) {
3519                 global $wgEnableScaryTranscluding;
3520
3521                 if (!$wgEnableScaryTranscluding)
3522                         return wfMsg('scarytranscludedisabled');
3523
3524                 $url = $title->getFullUrl( "action=$action" );
3525
3526                 if (strlen($url) > 255)
3527                         return wfMsg('scarytranscludetoolong');
3528                 return $this->fetchScaryTemplateMaybeFromCache($url);
3529         }
3530
3531         function fetchScaryTemplateMaybeFromCache($url) {
3532                 global $wgTranscludeCacheExpiry;
3533                 $dbr = wfGetDB(DB_SLAVE);
3534                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3535                                 array('tc_url' => $url));
3536                 if ($obj) {
3537                         $time = $obj->tc_time;
3538                         $text = $obj->tc_contents;
3539                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3540                                 return $text;
3541                         }
3542                 }
3543
3544                 $text = Http::get($url);
3545                 if (!$text)
3546                         return wfMsg('scarytranscludefailed', $url);
3547
3548                 $dbw = wfGetDB(DB_MASTER);
3549                 $dbw->replace('transcache', array('tc_url'), array(
3550                         'tc_url' => $url,
3551                         'tc_time' => time(),
3552                         'tc_contents' => $text));
3553                 return $text;
3554         }
3555
3556
3557         /**
3558          * Triple brace replacement -- used for template arguments
3559          * @private
3560          */
3561         function argSubstitution( $piece, $frame ) {
3562                 wfProfileIn( __METHOD__ );
3563
3564                 $text = false;
3565                 $error = false;
3566                 $parts = $piece['parts'];
3567                 $argWithSpaces = $frame->expand( $piece['title'] );
3568                 $arg = trim( $argWithSpaces );
3569
3570                 if ( isset( $frame->args[$arg] ) ) {
3571                         $text = $frame->parent->expand( $frame->args[$arg] );
3572                 } else if ( ( $this->ot['html'] || $this->ot['pre'] ) && $parts->length > 0 ) {
3573                         $text = $frame->expand( $parts->item( 0 ) );
3574                 }
3575                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3576                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3577                 }
3578
3579                 if ( $text === false ) {
3580                         $text = '{{{' . $frame->implode( '|', $argWithSpaces, $parts ) . '}}}';
3581                 }
3582                 if ( $error !== false ) {
3583                         $text .= $error;
3584                 }
3585
3586                 wfProfileOut( __METHOD__ );
3587                 return $text;
3588         }
3589
3590         /**
3591          * Return the text to be used for a given extension tag.
3592          * This is the ghost of strip().
3593          *
3594          * @param array $params Associative array of parameters:
3595          *     name       DOMNode for the tag name
3596          *     attrText   DOMNode for unparsed text where tag attributes are thought to be
3597          *     inner      Contents of extension element
3598          *     noClose    Original text did not have a close tag
3599          * @param PPFrame $frame
3600          */
3601         function extensionSubstitution( $params, $frame ) {
3602                 global $wgRawHtml, $wgContLang;
3603                 static $n = 1;
3604
3605                 $name = $frame->expand( $params['name'] );
3606                 $attrText = is_null( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3607                 $content = is_null( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3608
3609                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $n++) . $this->mMarkerSuffix;
3610
3611                 if ( $this->ot['html'] ) {
3612                         if ( $name == '!--' ) {
3613                                 return '';
3614                         }
3615                         $name = strtolower( $name );
3616
3617                         $params = Sanitizer::decodeTagAttributes( $attrText );
3618                         switch ( $name ) {
3619                                 case 'html':
3620                                         if( $wgRawHtml ) {
3621                                                 $output = $content;
3622                                                 break;
3623                                         } else {
3624                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3625                                         }
3626                                 case 'nowiki':
3627                                         $output = Xml::escapeTagsOnly( $content );
3628                                         break;
3629                                 case 'math':
3630                                         $output = $wgContLang->armourMath(
3631                                                 MathRenderer::renderMath( $content, $params ) );
3632                                         break;
3633                                 case 'gallery':
3634                                         $output = $this->renderImageGallery( $content, $params );
3635                                         break;
3636                                 default:
3637                                         if( isset( $this->mTagHooks[$name] ) ) {
3638                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3639                                                         array( $content, $params, $this ) );
3640                                         } else {
3641                                                 throw new MWException( "Invalid call hook $name" );
3642                                         }
3643                         }
3644                 } else {
3645                         if ( $name == '!--' ) {
3646                                 $output = '<!--' . $content . '-->';
3647                         } else {
3648                                 if ( $content === null ) {
3649                                         $output = "<$name$attrText/>";
3650                                 } else {
3651                                         $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3652                                         $output = "<$name$attrText>$content$close";
3653                                 }
3654                         }
3655                 }
3656
3657                 if ( $name == 'html' || $name == 'nowiki' ) {
3658                         $this->mStripState->nowiki->setPair( $marker, $output );
3659                 } else {
3660                         $this->mStripState->general->setPair( $marker, $output );
3661                 }
3662                 return $marker;
3663         }
3664
3665         /**
3666          * Increment an include size counter
3667          *
3668          * @param string $type The type of expansion
3669          * @param integer $size The size of the text
3670          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3671          */
3672         function incrementIncludeSize( $type, $size ) {
3673                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3674                         return false;
3675                 } else {
3676                         $this->mIncludeSizes[$type] += $size;
3677                         return true;
3678                 }
3679         }
3680
3681         /**
3682          * Detect __NOGALLERY__ magic word and set a placeholder
3683          */
3684         function stripNoGallery( &$text ) {
3685                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3686                 # do not add TOC
3687                 $mw = MagicWord::get( 'nogallery' );
3688                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3689         }
3690
3691         /**
3692          * Find the first __TOC__ magic word and set a <!--MWTOC-->
3693          * placeholder that will then be replaced by the real TOC in
3694          * ->formatHeadings, this works because at this points real
3695          * comments will have already been discarded by the sanitizer.
3696          *
3697          * Any additional __TOC__ magic words left over will be discarded
3698          * as there can only be one TOC on the page.
3699          */
3700         function stripToc( $text ) {
3701                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3702                 # do not add TOC
3703                 $mw = MagicWord::get( 'notoc' );
3704                 if( $mw->matchAndRemove( $text ) ) {
3705                         $this->mShowToc = false;
3706                 }
3707
3708                 $mw = MagicWord::get( 'toc' );
3709                 if( $mw->match( $text ) ) {
3710                         $this->mShowToc = true;
3711                         $this->mForceTocPosition = true;
3712
3713                         // Set a placeholder. At the end we'll fill it in with the TOC.
3714                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3715
3716                         // Only keep the first one.
3717                         $text = $mw->replace( '', $text );
3718                 }
3719                 return $text;
3720         }
3721
3722         /**
3723          * This function accomplishes several tasks:
3724          * 1) Auto-number headings if that option is enabled
3725          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3726          * 3) Add a Table of contents on the top for users who have enabled the option
3727          * 4) Auto-anchor headings
3728          *
3729          * It loops through all headlines, collects the necessary data, then splits up the
3730          * string and re-inserts the newly formatted headlines.
3731          *
3732          * @param string $text
3733          * @param boolean $isMain
3734          * @private
3735          */
3736         function formatHeadings( $text, $isMain=true ) {
3737                 global $wgMaxTocLevel, $wgContLang;
3738
3739                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3740                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3741                         $showEditLink = 0;
3742                 } else {
3743                         $showEditLink = $this->mOptions->getEditSection();
3744                 }
3745
3746                 # Inhibit editsection links if requested in the page
3747                 $esw =& MagicWord::get( 'noeditsection' );
3748                 if( $esw->matchAndRemove( $text ) ) {
3749                         $showEditLink = 0;
3750                 }
3751
3752                 # Get all headlines for numbering them and adding funky stuff like [edit]
3753                 # links - this is for later, but we need the number of headlines right now
3754                 $matches = array();
3755                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3756
3757                 # if there are fewer than 4 headlines in the article, do not show TOC
3758                 # unless it's been explicitly enabled.
3759                 $enoughToc = $this->mShowToc &&
3760                         (($numMatches >= 4) || $this->mForceTocPosition);
3761
3762                 # Allow user to stipulate that a page should have a "new section"
3763                 # link added via __NEWSECTIONLINK__
3764                 $mw =& MagicWord::get( 'newsectionlink' );
3765                 if( $mw->matchAndRemove( $text ) )
3766                         $this->mOutput->setNewSection( true );
3767
3768                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3769                 # override above conditions and always show TOC above first header
3770                 $mw =& MagicWord::get( 'forcetoc' );
3771                 if ($mw->matchAndRemove( $text ) ) {
3772                         $this->mShowToc = true;
3773                         $enoughToc = true;
3774                 }
3775
3776                 # We need this to perform operations on the HTML
3777                 $sk = $this->mOptions->getSkin();
3778
3779                 # headline counter
3780                 $headlineCount = 0;
3781                 $numVisible = 0;
3782
3783                 # Ugh .. the TOC should have neat indentation levels which can be
3784                 # passed to the skin functions. These are determined here
3785                 $toc = '';
3786                 $full = '';
3787                 $head = array();
3788                 $sublevelCount = array();
3789                 $levelCount = array();
3790                 $toclevel = 0;
3791                 $level = 0;
3792                 $prevlevel = 0;
3793                 $toclevel = 0;
3794                 $prevtoclevel = 0;
3795                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-{$this->mMarkerSuffix}";
3796                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3797
3798                 foreach( $matches[3] as $headline ) {
3799                         $isTemplate = false;
3800                         $titleText = false;
3801                         $sectionIndex = false;
3802                         $numbering = '';
3803                         $markerMatches = array();
3804                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3805                                 $serial = $markerMatches[1];
3806                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3807                                 $isTemplate = ($titleText != $baseTitleText);
3808                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3809                         }
3810
3811                         if( $toclevel ) {
3812                                 $prevlevel = $level;
3813                                 $prevtoclevel = $toclevel;
3814                         }
3815                         $level = $matches[1][$headlineCount];
3816
3817                         if( $doNumberHeadings || $enoughToc ) {
3818
3819                                 if ( $level > $prevlevel ) {
3820                                         # Increase TOC level
3821                                         $toclevel++;
3822                                         $sublevelCount[$toclevel] = 0;
3823                                         if( $toclevel<$wgMaxTocLevel ) {
3824                                                 $prevtoclevel = $toclevel;
3825                                                 $toc .= $sk->tocIndent();
3826                                                 $numVisible++;
3827                                         }
3828                                 }
3829                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3830                                         # Decrease TOC level, find level to jump to
3831
3832                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3833                                                 # Can only go down to level 1
3834                                                 $toclevel = 1;
3835                                         } else {
3836                                                 for ($i = $toclevel; $i > 0; $i--) {
3837                                                         if ( $levelCount[$i] == $level ) {
3838                                                                 # Found last matching level
3839                                                                 $toclevel = $i;
3840                                                                 break;
3841                                                         }
3842                                                         elseif ( $levelCount[$i] < $level ) {
3843                                                                 # Found first matching level below current level
3844                                                                 $toclevel = $i + 1;
3845                                                                 break;
3846                                                         }
3847                                                 }
3848                                         }
3849                                         if( $toclevel<$wgMaxTocLevel ) {
3850                                                 if($prevtoclevel < $wgMaxTocLevel) {
3851                                                         # Unindent only if the previous toc level was shown :p
3852                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3853                                                 } else {
3854                                                         $toc .= $sk->tocLineEnd();
3855                                                 }
3856                                         }
3857                                 }
3858                                 else {
3859                                         # No change in level, end TOC line
3860                                         if( $toclevel<$wgMaxTocLevel ) {
3861                                                 $toc .= $sk->tocLineEnd();
3862                                         }
3863                                 }
3864
3865                                 $levelCount[$toclevel] = $level;
3866
3867                                 # count number of headlines for each level
3868                                 @$sublevelCount[$toclevel]++;
3869                                 $dot = 0;
3870                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3871                                         if( !empty( $sublevelCount[$i] ) ) {
3872                                                 if( $dot ) {
3873                                                         $numbering .= '.';
3874                                                 }
3875                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3876                                                 $dot = 1;
3877                                         }
3878                                 }
3879                         }
3880
3881                         # The safe header is a version of the header text safe to use for links
3882                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3883                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3884
3885                         # Remove link placeholders by the link text.
3886                         #     <!--LINK number-->
3887                         # turns into
3888                         #     link text with suffix
3889                         $safeHeadline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3890                                                             "\$this->mLinkHolders['texts'][\$1]",
3891                                                             $safeHeadline );
3892                         $safeHeadline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3893                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3894                                                             $safeHeadline );
3895
3896                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3897                         $tocline = preg_replace(
3898                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3899                                 array( '',                          '<$1>'),
3900                                 $safeHeadline
3901                         );
3902                         $tocline = trim( $tocline );
3903
3904                         # For the anchor, strip out HTML-y stuff period
3905                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3906                         $safeHeadline = trim( $safeHeadline );
3907
3908                         # Save headline for section edit hint before it's escaped
3909                         $headlineHint = $safeHeadline;
3910                         $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3911                         $refers[$headlineCount] = $safeHeadline;
3912
3913                         # count how many in assoc. array so we can track dupes in anchors
3914                         isset( $refers[$safeHeadline] ) ? $refers[$safeHeadline]++ : $refers[$safeHeadline] = 1;
3915                         $refcount[$headlineCount] = $refers[$safeHeadline];
3916
3917                         # Don't number the heading if it is the only one (looks silly)
3918                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3919                                 # the two are different if the line contains a link
3920                                 $headline=$numbering . ' ' . $headline;
3921                         }
3922
3923                         # Create the anchor for linking from the TOC to the section
3924                         $anchor = $safeHeadline;
3925                         if($refcount[$headlineCount] > 1 ) {
3926                                 $anchor .= '_' . $refcount[$headlineCount];
3927                         }
3928                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3929                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3930                         }
3931                         # give headline the correct <h#> tag
3932                         if( $showEditLink && $sectionIndex !== false ) {
3933                                 if( $isTemplate )
3934                                         $editlink = $sk->editSectionLinkForOther($titleText, $sectionIndex);
3935                                 else
3936                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3937                         } else {
3938                                 $editlink = '';
3939                         }
3940                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3941
3942                         $headlineCount++;
3943                 }
3944
3945                 # Never ever show TOC if no headers
3946                 if( $numVisible < 1 ) {
3947                         $enoughToc = false;
3948                 }
3949
3950                 if( $enoughToc ) {
3951                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3952                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3953                         }
3954                         $toc = $sk->tocList( $toc );
3955                 }
3956
3957                 # split up and insert constructed headlines
3958
3959                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3960                 $i = 0;
3961
3962                 foreach( $blocks as $block ) {
3963                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3964                                 # This is the [edit] link that appears for the top block of text when
3965                                 # section editing is enabled
3966
3967                                 # Disabled because it broke block formatting
3968                                 # For example, a bullet point in the top line
3969                                 # $full .= $sk->editSectionLink(0);
3970                         }
3971                         $full .= $block;
3972                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3973                                 # Top anchor now in skin
3974                                 $full = $full.$toc;
3975                         }
3976
3977                         if( !empty( $head[$i] ) ) {
3978                                 $full .= $head[$i];
3979                         }
3980                         $i++;
3981                 }
3982                 if( $this->mForceTocPosition ) {
3983                         return str_replace( '<!--MWTOC-->', $toc, $full );
3984                 } else {
3985                         return $full;
3986                 }
3987         }
3988
3989         /**
3990          * Transform wiki markup when saving a page by doing \r\n -> \n
3991          * conversion, substitting signatures, {{subst:}} templates, etc.
3992          *
3993          * @param string $text the text to transform
3994          * @param Title &$title the Title object for the current article
3995          * @param User &$user the User object describing the current user
3996          * @param ParserOptions $options parsing options
3997          * @param bool $clearState whether to clear the parser state first
3998          * @return string the altered wiki markup
3999          * @public
4000          */
4001         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
4002                 $this->mOptions = $options;
4003                 $this->mTitle =& $title;
4004                 $this->setOutputType( OT_WIKI );
4005
4006                 if ( $clearState ) {
4007                         $this->clearState();
4008                 }
4009
4010                 $pairs = array(
4011                         "\r\n" => "\n",
4012                 );
4013                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
4014                 $text = $this->pstPass2( $text, $user );
4015                 $text = $this->mStripState->unstripBoth( $text );
4016                 return $text;
4017         }
4018
4019         /**
4020          * Pre-save transform helper function
4021          * @private
4022          */
4023         function pstPass2( $text, $user ) {
4024                 global $wgContLang, $wgLocaltimezone;
4025
4026                 /* Note: This is the timestamp saved as hardcoded wikitext to
4027                  * the database, we use $wgContLang here in order to give
4028                  * everyone the same signature and use the default one rather
4029                  * than the one selected in each user's preferences.
4030                  */
4031                 if ( isset( $wgLocaltimezone ) ) {
4032                         $oldtz = getenv( 'TZ' );
4033                         putenv( 'TZ='.$wgLocaltimezone );
4034                 }
4035                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
4036                   ' (' . date( 'T' ) . ')';
4037                 if ( isset( $wgLocaltimezone ) ) {
4038                         putenv( 'TZ='.$oldtz );
4039                 }
4040
4041                 # Variable replacement
4042                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4043                 $text = $this->replaceVariables( $text );
4044
4045                 # Strip out <nowiki> etc. added via replaceVariables
4046                 #$text = $this->strip( $text, $this->mStripState, false, array( 'gallery' ) );
4047
4048                 # Signatures
4049                 $sigText = $this->getUserSig( $user );
4050                 $text = strtr( $text, array(
4051                         '~~~~~' => $d,
4052                         '~~~~' => "$sigText $d",
4053                         '~~~' => $sigText
4054                 ) );
4055
4056                 # Context links: [[|name]] and [[name (context)|]]
4057                 #
4058                 global $wgLegalTitleChars;
4059                 $tc = "[$wgLegalTitleChars]";
4060                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
4061
4062                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
4063                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
4064                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
4065
4066                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4067                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4068                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4069
4070                 $t = $this->mTitle->getText();
4071                 $m = array();
4072                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4073                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4074                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
4075                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4076                 } else {
4077                         # if there's no context, don't bother duplicating the title
4078                         $text = preg_replace( $p2, '[[\\1]]', $text );
4079                 }
4080
4081                 # Trim trailing whitespace
4082                 $text = rtrim( $text );
4083
4084                 return $text;
4085         }
4086
4087         /**
4088          * Fetch the user's signature text, if any, and normalize to
4089          * validated, ready-to-insert wikitext.
4090          *
4091          * @param User $user
4092          * @return string
4093          * @private
4094          */
4095         function getUserSig( &$user ) {
4096                 global $wgMaxSigChars;
4097
4098                 $username = $user->getName();
4099                 $nickname = $user->getOption( 'nickname' );
4100                 $nickname = $nickname === '' ? $username : $nickname;
4101
4102                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4103                         $nickname = $username;
4104                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4105                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
4106                         # Sig. might contain markup; validate this
4107                         if( $this->validateSig( $nickname ) !== false ) {
4108                                 # Validated; clean up (if needed) and return it
4109                                 return $this->cleanSig( $nickname, true );
4110                         } else {
4111                                 # Failed to validate; fall back to the default
4112                                 $nickname = $username;
4113                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
4114                         }
4115                 }
4116
4117                 // Make sure nickname doesnt get a sig in a sig
4118                 $nickname = $this->cleanSigInSig( $nickname );
4119
4120                 # If we're still here, make it a link to the user page
4121                 $userText = wfEscapeWikiText( $username );
4122                 $nickText = wfEscapeWikiText( $nickname );
4123                 if ( $user->isAnon() )  {
4124                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4125                 } else {
4126                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4127                 }
4128         }
4129
4130         /**
4131          * Check that the user's signature contains no bad XML
4132          *
4133          * @param string $text
4134          * @return mixed An expanded string, or false if invalid.
4135          */
4136         function validateSig( $text ) {
4137                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
4138         }
4139
4140         /**
4141          * Clean up signature text
4142          *
4143          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4144          * 2) Substitute all transclusions
4145          *
4146          * @param string $text
4147          * @param $parsing Whether we're cleaning (preferences save) or parsing
4148          * @return string Signature text
4149          */
4150         function cleanSig( $text, $parsing = false ) {
4151                 if ( !$parsing ) {
4152                         global $wgTitle;
4153                         $this->startExternalParse( $wgTitle, new ParserOptions(), OT_MSG );
4154                 }
4155
4156                 # FIXME: regex doesn't respect extension tags or nowiki
4157                 #  => Move this logic to braceSubstitution()
4158                 $substWord = MagicWord::get( 'subst' );
4159                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4160                 $substText = '{{' . $substWord->getSynonym( 0 );
4161
4162                 $text = preg_replace( $substRegex, $substText, $text );
4163                 $text = $this->cleanSigInSig( $text );
4164                 $dom = $this->preprocessToDom( $text );
4165                 $frame = new PPFrame( $this );
4166                 $text = $frame->expand( $dom->documentElement );
4167
4168                 if ( !$parsing ) {
4169                         $text = $this->mStripState->unstripBoth( $text );
4170                 }
4171
4172                 return $text;
4173         }
4174
4175         /**
4176          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4177          * @param string $text
4178          * @return string Signature text with /~{3,5}/ removed
4179          */
4180         function cleanSigInSig( $text ) {
4181                 $text = preg_replace( '/~{3,5}/', '', $text );
4182                 return $text;
4183         }
4184
4185         /**
4186          * Set up some variables which are usually set up in parse()
4187          * so that an external function can call some class members with confidence
4188          * @public
4189          */
4190         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4191                 $this->mTitle =& $title;
4192                 $this->mOptions = $options;
4193                 $this->setOutputType( $outputType );
4194                 if ( $clearState ) {
4195                         $this->clearState();
4196                 }
4197         }
4198
4199         /**
4200          * Transform a MediaWiki message by replacing magic variables.
4201          *
4202          * For some unknown reason, it also expands templates, but only to the
4203          * first recursion level. This is wrong and broken, probably introduced
4204          * accidentally during refactoring, but probably relied upon by thousands
4205          * of users.
4206          *
4207          * @param string $text the text to transform
4208          * @param ParserOptions $options  options
4209          * @return string the text with variables substituted
4210          * @public
4211          */
4212         function transformMsg( $text, $options ) {
4213                 global $wgTitle;
4214                 static $executing = false;
4215
4216                 $fname = "Parser::transformMsg";
4217
4218                 # Guard against infinite recursion
4219                 if ( $executing ) {
4220                         return $text;
4221                 }
4222                 $executing = true;
4223
4224                 wfProfileIn($fname);
4225
4226                 if ( $wgTitle && !( $wgTitle instanceof FakeTitle ) ) {
4227                         $this->mTitle = $wgTitle;
4228                 } else {
4229                         $this->mTitle = Title::newFromText('msg');
4230                 }
4231                 $this->mOptions = $options;
4232                 $this->setOutputType( OT_MSG );
4233                 $this->clearState();
4234                 $text = $this->replaceVariables( $text );
4235                 $text = $this->mStripState->unstripBoth( $text );
4236
4237                 $executing = false;
4238                 wfProfileOut($fname);
4239                 return $text;
4240         }
4241
4242         /**
4243          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4244          * The callback should have the following form:
4245          *    function myParserHook( $text, $params, &$parser ) { ... }
4246          *
4247          * Transform and return $text. Use $parser for any required context, e.g. use
4248          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4249          *
4250          * @public
4251          *
4252          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4253          * @param mixed $callback The callback function (and object) to use for the tag
4254          *
4255          * @return The old value of the mTagHooks array associated with the hook
4256          */
4257         function setHook( $tag, $callback ) {
4258                 $tag = strtolower( $tag );
4259                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4260                 $this->mTagHooks[$tag] = $callback;
4261                 $this->mStripList[] = $tag;
4262
4263                 return $oldVal;
4264         }
4265
4266         function setTransparentTagHook( $tag, $callback ) {
4267                 $tag = strtolower( $tag );
4268                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4269                 $this->mTransparentTagHooks[$tag] = $callback;
4270
4271                 return $oldVal;
4272         }
4273
4274         /**
4275          * Create a function, e.g. {{sum:1|2|3}}
4276          * The callback function should have the form:
4277          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4278          *
4279          * The callback may either return the text result of the function, or an array with the text
4280          * in element 0, and a number of flags in the other elements. The names of the flags are
4281          * specified in the keys. Valid flags are:
4282          *   found                     The text returned is valid, stop processing the template. This
4283          *                             is on by default.
4284          *   nowiki                    Wiki markup in the return value should be escaped
4285          *   noparse                   Unsafe HTML tags should not be stripped, etc.
4286          *   noargs                    Don't replace triple-brace arguments in the return value
4287          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4288          *
4289          * @public
4290          *
4291          * @param string $id The magic word ID
4292          * @param mixed $callback The callback function (and object) to use
4293          * @param integer $flags a combination of the following flags:
4294          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4295          *
4296          * @return The old callback function for this name, if any
4297          */
4298         function setFunctionHook( $id, $callback, $flags = 0 ) {
4299                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4300                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4301
4302                 # Add to function cache
4303                 $mw = MagicWord::get( $id );
4304                 if( !$mw )
4305                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
4306
4307                 $synonyms = $mw->getSynonyms();
4308                 $sensitive = intval( $mw->isCaseSensitive() );
4309
4310                 foreach ( $synonyms as $syn ) {
4311                         # Case
4312                         if ( !$sensitive ) {
4313                                 $syn = strtolower( $syn );
4314                         }
4315                         # Add leading hash
4316                         if ( !( $flags & SFH_NO_HASH ) ) {
4317                                 $syn = '#' . $syn;
4318                         }
4319                         # Remove trailing colon
4320                         if ( substr( $syn, -1, 1 ) == ':' ) {
4321                                 $syn = substr( $syn, 0, -1 );
4322                         }
4323                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4324                 }
4325                 return $oldVal;
4326         }
4327
4328         /**
4329          * Get all registered function hook identifiers
4330          *
4331          * @return array
4332          */
4333         function getFunctionHooks() {
4334                 return array_keys( $this->mFunctionHooks );
4335         }
4336
4337         /**
4338          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4339          * Placeholders created in Skin::makeLinkObj()
4340          * Returns an array of link CSS classes, indexed by PDBK.
4341          * $options is a bit field, RLH_FOR_UPDATE to select for update
4342          */
4343         function replaceLinkHolders( &$text, $options = 0 ) {
4344                 global $wgUser;
4345                 global $wgContLang;
4346
4347                 $fname = 'Parser::replaceLinkHolders';
4348                 wfProfileIn( $fname );
4349
4350                 $pdbks = array();
4351                 $colours = array();
4352                 $linkcolour_ids = array();
4353                 $sk = $this->mOptions->getSkin();
4354                 $linkCache =& LinkCache::singleton();
4355
4356                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
4357                         wfProfileIn( $fname.'-check' );
4358                         $dbr = wfGetDB( DB_SLAVE );
4359                         $page = $dbr->tableName( 'page' );
4360                         $threshold = $wgUser->getOption('stubthreshold');
4361
4362                         # Sort by namespace
4363                         asort( $this->mLinkHolders['namespaces'] );
4364
4365                         # Generate query
4366                         $query = false;
4367                         $current = null;
4368                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4369                                 # Make title object
4370                                 $title = $this->mLinkHolders['titles'][$key];
4371
4372                                 # Skip invalid entries.
4373                                 # Result will be ugly, but prevents crash.
4374                                 if ( is_null( $title ) ) {
4375                                         continue;
4376                                 }
4377                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
4378
4379                                 # Check if it's a static known link, e.g. interwiki
4380                                 if ( $title->isAlwaysKnown() ) {
4381                                         $colours[$pdbk] = '';
4382                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
4383                                         $colours[$pdbk] = '';
4384                                         $this->mOutput->addLink( $title, $id );
4385                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
4386                                         $colours[$pdbk] = 'new';
4387                                 } elseif ( $title->getNamespace() == NS_SPECIAL && !SpecialPage::exists( $pdbk ) ) {
4388                                         $colours[$pdbk] = 'new';
4389                                 } else {
4390                                         # Not in the link cache, add it to the query
4391                                         if ( !isset( $current ) ) {
4392                                                 $current = $ns;
4393                                                 $query =  "SELECT page_id, page_namespace, page_title";
4394                                                 if ( $threshold > 0 ) {
4395                                                         $query .= ', page_len, page_is_redirect';
4396                                                 }
4397                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
4398                                         } elseif ( $current != $ns ) {
4399                                                 $current = $ns;
4400                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4401                                         } else {
4402                                                 $query .= ', ';
4403                                         }
4404
4405                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4406                                 }
4407                         }
4408                         if ( $query ) {
4409                                 $query .= '))';
4410                                 if ( $options & RLH_FOR_UPDATE ) {
4411                                         $query .= ' FOR UPDATE';
4412                                 }
4413
4414                                 $res = $dbr->query( $query, $fname );
4415
4416                                 # Fetch data and form into an associative array
4417                                 # non-existent = broken
4418                                 while ( $s = $dbr->fetchObject($res) ) {
4419                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4420                                         $pdbk = $title->getPrefixedDBkey();
4421                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4422                                         $this->mOutput->addLink( $title, $s->page_id );
4423                                         $colours[$pdbk] = $sk->getLinkColour( $s, $threshold );
4424                                         //add id to the extension todolist
4425                                         $linkcolour_ids[$s->page_id] = $pdbk;
4426                                 }
4427                                 //pass an array of page_ids to an extension
4428                                 wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4429                         }
4430                         wfProfileOut( $fname.'-check' );
4431
4432                         # Do a second query for different language variants of links and categories
4433                         if($wgContLang->hasVariants()){
4434                                 $linkBatch = new LinkBatch();
4435                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4436                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4437                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4438
4439                                 $categories = $this->mOutput->getCategoryLinks();
4440
4441                                 // Add variants of links to link batch
4442                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4443                                         $title = $this->mLinkHolders['titles'][$key];
4444                                         if ( is_null( $title ) )
4445                                                 continue;
4446
4447                                         $pdbk = $title->getPrefixedDBkey();
4448                                         $titleText = $title->getText();
4449
4450                                         // generate all variants of the link title text
4451                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4452
4453                                         // if link was not found (in first query), add all variants to query
4454                                         if ( !isset($colours[$pdbk]) ){
4455                                                 foreach($allTextVariants as $textVariant){
4456                                                         if($textVariant != $titleText){
4457                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4458                                                                 if(is_null($variantTitle)) continue;
4459                                                                 $linkBatch->addObj( $variantTitle );
4460                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4461                                                         }
4462                                                 }
4463                                         }
4464                                 }
4465
4466                                 // process categories, check if a category exists in some variant
4467                                 foreach( $categories as $category ){
4468                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4469                                         foreach($variants as $variant){
4470                                                 if($variant != $category){
4471                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4472                                                         if(is_null($variantTitle)) continue;
4473                                                         $linkBatch->addObj( $variantTitle );
4474                                                         $categoryMap[$variant] = $category;
4475                                                 }
4476                                         }
4477                                 }
4478
4479
4480                                 if(!$linkBatch->isEmpty()){
4481                                         // construct query
4482                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4483
4484                                         $variantQuery =  "SELECT page_id, page_namespace, page_title";
4485                                         if ( $threshold > 0 ) {
4486                                                 $variantQuery .= ', page_len, page_is_redirect';
4487                                         }
4488
4489                                         $variantQuery .= " FROM $page WHERE $titleClause";
4490                                         if ( $options & RLH_FOR_UPDATE ) {
4491                                                 $variantQuery .= ' FOR UPDATE';
4492                                         }
4493
4494                                         $varRes = $dbr->query( $variantQuery, $fname );
4495
4496                                         // for each found variants, figure out link holders and replace
4497                                         while ( $s = $dbr->fetchObject($varRes) ) {
4498
4499                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4500                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4501                                                 $vardbk = $variantTitle->getDBkey();
4502
4503                                                 $holderKeys = array();
4504                                                 if(isset($variantMap[$varPdbk])){
4505                                                         $holderKeys = $variantMap[$varPdbk];
4506                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4507                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4508                                                 }
4509
4510                                                 // loop over link holders
4511                                                 foreach($holderKeys as $key){
4512                                                         $title = $this->mLinkHolders['titles'][$key];
4513                                                         if ( is_null( $title ) ) continue;
4514
4515                                                         $pdbk = $title->getPrefixedDBkey();
4516
4517                                                         if(!isset($colours[$pdbk])){
4518                                                                 // found link in some of the variants, replace the link holder data
4519                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4520                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4521
4522                                                                 // set pdbk and colour
4523                                                                 $pdbks[$key] = $varPdbk;
4524                                                                 $colours[$varPdbk] = $sk->getLinkColour( $s, $threshold );
4525                                                                 $linkcolour_ids[$s->page_id] = $pdbk;
4526                                                         }
4527                                                         wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4528                                                 }
4529
4530                                                 // check if the object is a variant of a category
4531                                                 if(isset($categoryMap[$vardbk])){
4532                                                         $oldkey = $categoryMap[$vardbk];
4533                                                         if($oldkey != $vardbk)
4534                                                                 $varCategories[$oldkey]=$vardbk;
4535                                                 }
4536                                         }
4537
4538                                         // rebuild the categories in original order (if there are replacements)
4539                                         if(count($varCategories)>0){
4540                                                 $newCats = array();
4541                                                 $originalCats = $this->mOutput->getCategories();
4542                                                 foreach($originalCats as $cat => $sortkey){
4543                                                         // make the replacement
4544                                                         if( array_key_exists($cat,$varCategories) )
4545                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4546                                                         else $newCats[$cat] = $sortkey;
4547                                                 }
4548                                                 $this->mOutput->setCategoryLinks($newCats);
4549                                         }
4550                                 }
4551                         }
4552
4553                         # Construct search and replace arrays
4554                         wfProfileIn( $fname.'-construct' );
4555                         $replacePairs = array();
4556                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4557                                 $pdbk = $pdbks[$key];
4558                                 $searchkey = "<!--LINK $key-->";
4559                                 $title = $this->mLinkHolders['titles'][$key];
4560                                 if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] == 'new' ) {
4561                                         $linkCache->addBadLinkObj( $title );
4562                                         $colours[$pdbk] = 'new';
4563                                         $this->mOutput->addLink( $title, 0 );
4564                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4565                                                                         $this->mLinkHolders['texts'][$key],
4566                                                                         $this->mLinkHolders['queries'][$key] );
4567                                 } else {
4568                                         $replacePairs[$searchkey] = $sk->makeColouredLinkObj( $title, $colours[$pdbk],
4569                                                                         $this->mLinkHolders['texts'][$key],
4570                                                                         $this->mLinkHolders['queries'][$key] );
4571                                 }
4572                         }
4573                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4574                         wfProfileOut( $fname.'-construct' );
4575
4576                         # Do the thing
4577                         wfProfileIn( $fname.'-replace' );
4578                         $text = preg_replace_callback(
4579                                 '/(<!--LINK .*?-->)/',
4580                                 $replacer->cb(),
4581                                 $text);
4582
4583                         wfProfileOut( $fname.'-replace' );
4584                 }
4585
4586                 # Now process interwiki link holders
4587                 # This is quite a bit simpler than internal links
4588                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4589                         wfProfileIn( $fname.'-interwiki' );
4590                         # Make interwiki link HTML
4591                         $replacePairs = array();
4592                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4593                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4594                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4595                         }
4596                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4597
4598                         $text = preg_replace_callback(
4599                                 '/<!--IWLINK (.*?)-->/',
4600                                 $replacer->cb(),
4601                                 $text );
4602                         wfProfileOut( $fname.'-interwiki' );
4603                 }
4604
4605                 wfProfileOut( $fname );
4606                 return $colours;
4607         }
4608
4609         /**
4610          * Replace <!--LINK--> link placeholders with plain text of links
4611          * (not HTML-formatted).
4612          * @param string $text
4613          * @return string
4614          */
4615         function replaceLinkHoldersText( $text ) {
4616                 $fname = 'Parser::replaceLinkHoldersText';
4617                 wfProfileIn( $fname );
4618
4619                 $text = preg_replace_callback(
4620                         '/<!--(LINK|IWLINK) (.*?)-->/',
4621                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4622                         $text );
4623
4624                 wfProfileOut( $fname );
4625                 return $text;
4626         }
4627
4628         /**
4629          * @param array $matches
4630          * @return string
4631          * @private
4632          */
4633         function replaceLinkHoldersTextCallback( $matches ) {
4634                 $type = $matches[1];
4635                 $key  = $matches[2];
4636                 if( $type == 'LINK' ) {
4637                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4638                                 return $this->mLinkHolders['texts'][$key];
4639                         }
4640                 } elseif( $type == 'IWLINK' ) {
4641                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4642                                 return $this->mInterwikiLinkHolders['texts'][$key];
4643                         }
4644                 }
4645                 return $matches[0];
4646         }
4647
4648         /**
4649          * Tag hook handler for 'pre'.
4650          */
4651         function renderPreTag( $text, $attribs ) {
4652                 // Backwards-compatibility hack
4653                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4654
4655                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4656                 return wfOpenElement( 'pre', $attribs ) .
4657                         Xml::escapeTagsOnly( $content ) .
4658                         '</pre>';
4659         }
4660
4661         /**
4662          * Renders an image gallery from a text with one line per image.
4663          * text labels may be given by using |-style alternative text. E.g.
4664          *   Image:one.jpg|The number "1"
4665          *   Image:tree.jpg|A tree
4666          * given as text will return the HTML of a gallery with two images,
4667          * labeled 'The number "1"' and
4668          * 'A tree'.
4669          */
4670         function renderImageGallery( $text, $params ) {
4671                 $ig = new ImageGallery();
4672                 $ig->setContextTitle( $this->mTitle );
4673                 $ig->setShowBytes( false );
4674                 $ig->setShowFilename( false );
4675                 $ig->setParser( $this );
4676                 $ig->setHideBadImages();
4677                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4678                 $ig->useSkin( $this->mOptions->getSkin() );
4679                 $ig->mRevisionId = $this->mRevisionId;
4680
4681                 if( isset( $params['caption'] ) ) {
4682                         $caption = $params['caption'];
4683                         $caption = htmlspecialchars( $caption );
4684                         $caption = $this->replaceInternalLinks( $caption );
4685                         $ig->setCaptionHtml( $caption );
4686                 }
4687                 if( isset( $params['perrow'] ) ) {
4688                         $ig->setPerRow( $params['perrow'] );
4689                 }
4690                 if( isset( $params['widths'] ) ) {
4691                         $ig->setWidths( $params['widths'] );
4692                 }
4693                 if( isset( $params['heights'] ) ) {
4694                         $ig->setHeights( $params['heights'] );
4695                 }
4696
4697                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4698
4699                 $lines = explode( "\n", $text );
4700                 foreach ( $lines as $line ) {
4701                         # match lines like these:
4702                         # Image:someimage.jpg|This is some image
4703                         $matches = array();
4704                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4705                         # Skip empty lines
4706                         if ( count( $matches ) == 0 ) {
4707                                 continue;
4708                         }
4709                         $tp = Title::newFromText( $matches[1] );
4710                         $nt =& $tp;
4711                         if( is_null( $nt ) ) {
4712                                 # Bogus title. Ignore these so we don't bomb out later.
4713                                 continue;
4714                         }
4715                         if ( isset( $matches[3] ) ) {
4716                                 $label = $matches[3];
4717                         } else {
4718                                 $label = '';
4719                         }
4720
4721                         $pout = $this->parse( $label,
4722                                 $this->mTitle,
4723                                 $this->mOptions,
4724                                 false, // Strip whitespace...?
4725                                 false  // Don't clear state!
4726                         );
4727                         $html = $pout->getText();
4728
4729                         $ig->add( $nt, $html );
4730
4731                         # Only add real images (bug #5586)
4732                         if ( $nt->getNamespace() == NS_IMAGE ) {
4733                                 $this->mOutput->addImage( $nt->getDBkey() );
4734                         }
4735                 }
4736                 return $ig->toHTML();
4737         }
4738
4739         function getImageParams( $handler ) {
4740                 if ( $handler ) {
4741                         $handlerClass = get_class( $handler );
4742                 } else {
4743                         $handlerClass = '';
4744                 }
4745                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4746                         // Initialise static lists
4747                         static $internalParamNames = array(
4748                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4749                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4750                                         'bottom', 'text-bottom' ),
4751                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4752                                         'upright', 'border' ),
4753                         );
4754                         static $internalParamMap;
4755                         if ( !$internalParamMap ) {
4756                                 $internalParamMap = array();
4757                                 foreach ( $internalParamNames as $type => $names ) {
4758                                         foreach ( $names as $name ) {
4759                                                 $magicName = str_replace( '-', '_', "img_$name" );
4760                                                 $internalParamMap[$magicName] = array( $type, $name );
4761                                         }
4762                                 }
4763                         }
4764
4765                         // Add handler params
4766                         $paramMap = $internalParamMap;
4767                         if ( $handler ) {
4768                                 $handlerParamMap = $handler->getParamMap();
4769                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4770                                         $paramMap[$magic] = array( 'handler', $paramName );
4771                                 }
4772                         }
4773                         $this->mImageParams[$handlerClass] = $paramMap;
4774                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4775                 }
4776                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4777         }
4778
4779         /**
4780          * Parse image options text and use it to make an image
4781          */
4782         function makeImage( $title, $options ) {
4783                 # @TODO: let the MediaHandler specify its transform parameters
4784                 #
4785                 # Check if the options text is of the form "options|alt text"
4786                 # Options are:
4787                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4788                 #  * left               no resizing, just left align. label is used for alt= only
4789                 #  * right              same, but right aligned
4790                 #  * none               same, but not aligned
4791                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4792                 #  * center             center the image
4793                 #  * framed             Keep original image size, no magnify-button.
4794                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4795                 #  * upright            reduce width for upright images, rounded to full __0 px
4796                 #  * border             draw a 1px border around the image
4797                 # vertical-align values (no % or length right now):
4798                 #  * baseline
4799                 #  * sub
4800                 #  * super
4801                 #  * top
4802                 #  * text-top
4803                 #  * middle
4804                 #  * bottom
4805                 #  * text-bottom
4806
4807                 $parts = array_map( 'trim', explode( '|', $options) );
4808                 $sk = $this->mOptions->getSkin();
4809
4810                 # Give extensions a chance to select the file revision for us
4811                 $skip = $time = false;
4812                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time ) );
4813
4814                 if ( $skip ) {
4815                         return $sk->makeLinkObj( $title );
4816                 }
4817
4818                 # Get parameter map
4819                 $file = wfFindFile( $title, $time );
4820                 $handler = $file ? $file->getHandler() : false;
4821
4822                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4823
4824                 # Process the input parameters
4825                 $caption = '';
4826                 $params = array( 'frame' => array(), 'handler' => array(),
4827                         'horizAlign' => array(), 'vertAlign' => array() );
4828                 foreach( $parts as $part ) {
4829                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4830                         if ( isset( $paramMap[$magicName] ) ) {
4831                                 list( $type, $paramName ) = $paramMap[$magicName];
4832                                 $params[$type][$paramName] = $value;
4833
4834                                 // Special case; width and height come in one variable together
4835                                 if( $type == 'handler' && $paramName == 'width' ) {
4836                                         $m = array();
4837                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $value, $m ) ) {
4838                                                 $params[$type]['width'] = intval( $m[1] );
4839                                                 $params[$type]['height'] = intval( $m[2] );
4840                                         } else {
4841                                                 $params[$type]['width'] = intval( $value );
4842                                         }
4843                                 }
4844                         } else {
4845                                 $caption = $part;
4846                         }
4847                 }
4848
4849                 # Process alignment parameters
4850                 if ( $params['horizAlign'] ) {
4851                         $params['frame']['align'] = key( $params['horizAlign'] );
4852                 }
4853                 if ( $params['vertAlign'] ) {
4854                         $params['frame']['valign'] = key( $params['vertAlign'] );
4855                 }
4856
4857                 # Validate the handler parameters
4858                 if ( $handler ) {
4859                         foreach ( $params['handler'] as $name => $value ) {
4860                                 if ( !$handler->validateParam( $name, $value ) ) {
4861                                         unset( $params['handler'][$name] );
4862                                 }
4863                         }
4864                 }
4865
4866                 # Strip bad stuff out of the alt text
4867                 $alt = $this->replaceLinkHoldersText( $caption );
4868
4869                 # make sure there are no placeholders in thumbnail attributes
4870                 # that are later expanded to html- so expand them now and
4871                 # remove the tags
4872                 $alt = $this->mStripState->unstripBoth( $alt );
4873                 $alt = Sanitizer::stripAllTags( $alt );
4874
4875                 $params['frame']['alt'] = $alt;
4876                 $params['frame']['caption'] = $caption;
4877
4878                 # Linker does the rest
4879                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'] );
4880
4881                 # Give the handler a chance to modify the parser object
4882                 if ( $handler ) {
4883                         $handler->parserTransformHook( $this, $file );
4884                 }
4885
4886                 return $ret;
4887         }
4888
4889         /**
4890          * Set a flag in the output object indicating that the content is dynamic and
4891          * shouldn't be cached.
4892          */
4893         function disableCache() {
4894                 wfDebug( "Parser output marked as uncacheable.\n" );
4895                 $this->mOutput->mCacheTime = -1;
4896         }
4897
4898         /**#@+
4899          * Callback from the Sanitizer for expanding items found in HTML attribute
4900          * values, so they can be safely tested and escaped.
4901          * @param string $text
4902          * @param PPFrame $frame
4903          * @return string
4904          * @private
4905          */
4906         function attributeStripCallback( &$text, $frame = false ) {
4907                 $text = $this->replaceVariables( $text, $frame );
4908                 $text = $this->mStripState->unstripBoth( $text );
4909                 return $text;
4910         }
4911
4912         /**#@-*/
4913
4914         /**#@+
4915          * Accessor/mutator
4916          */
4917         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4918         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4919         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4920         /**#@-*/
4921
4922         /**#@+
4923          * Accessor
4924          */
4925         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4926         /**#@-*/
4927
4928
4929         /**
4930          * Break wikitext input into sections, and either pull or replace
4931          * some particular section's text.
4932          *
4933          * External callers should use the getSection and replaceSection methods.
4934          *
4935          * @param $text Page wikitext
4936          * @param $section Numbered section. 0 pulls the text before the first
4937          *                 heading; other numbers will pull the given section
4938          *                 along with its lower-level subsections. If the section is
4939          *                 not found, $mode=get will return $newtext, and
4940          *                 $mode=replace will return $text.
4941          * @param $mode One of "get" or "replace"
4942          * @param $newText Replacement text for section data.
4943          * @return string for "get", the extracted section text.
4944          *                for "replace", the whole page with the section replaced.
4945          */
4946         private function extractSections( $text, $section, $mode, $newText='' ) {
4947                 $this->clearState();
4948                 $this->mOptions = new ParserOptions;
4949                 $this->setOutputType( OT_WIKI );
4950                 $curIndex = 0;
4951                 $outText = '';
4952                 $frame = new PPFrame( $this );
4953
4954                 // Preprocess the text
4955                 $dom = $this->preprocessToDom( $text );
4956                 $root = $dom->documentElement;
4957
4958                 // <h> nodes indicate section breaks
4959                 // They can only occur at the top level, so we can find them by iterating the root's children
4960                 $node = $root->firstChild;
4961
4962                 // Find the target section
4963                 if ( $section == 0 ) {
4964                         // Section zero doesn't nest, level=big
4965                         $targetLevel = 1000;
4966                 } else {
4967                         while ( $node ) {
4968                                 if ( $node->nodeName == 'h' ) {
4969                                         if ( $curIndex + 1 == $section ) {
4970                                                 break;
4971                                         }
4972                                         $curIndex++;
4973                                 }
4974                                 if ( $mode == 'replace' ) {
4975                                         $outText .= $frame->expand( $node, 0, PPFrame::RECOVER_ORIG );
4976                                 }
4977                                 $node = $node->nextSibling;
4978                         }
4979                         if ( $node ) {
4980                                 $targetLevel = $node->getAttribute( 'level' );
4981                         }
4982                 }
4983
4984                 if ( !$node ) {
4985                         // Not found
4986                         if ( $mode == 'get' ) {
4987                                 return $newText;
4988                         } else {
4989                                 return $text;
4990                         }
4991                 }
4992
4993                 // Find the end of the section, including nested sections
4994                 do {
4995                         if ( $node->nodeName == 'h' ) {
4996                                 $curIndex++;
4997                                 $curLevel = $node->getAttribute( 'level' );
4998                                 if ( $curIndex != $section && $curLevel <= $targetLevel ) {
4999                                         break;
5000                                 }
5001                         }
5002                         if ( $mode == 'get' ) {
5003                                 $outText .= $frame->expand( $node, 0, PPFrame::RECOVER_ORIG );
5004                         }
5005                         $node = $node->nextSibling;
5006                 } while ( $node );
5007
5008                 // Write out the remainder (in replace mode only)
5009                 if ( $mode == 'replace' ) {
5010                         // Output the replacement text
5011                         // Add two newlines on -- trailing whitespace in $newText is conventionally
5012                         // stripped by the editor, so we need both newlines to restore the paragraph gap
5013                         $outText .= $newText . "\n\n";
5014                         while ( $node ) {
5015                                 $outText .= $frame->expand( $node, 0, PPFrame::RECOVER_ORIG );
5016                                 $node = $node->nextSibling;
5017                         }
5018                 }
5019
5020                 if ( is_string( $outText ) ) {
5021                         // Re-insert stripped tags
5022                         $outText = trim( $this->mStripState->unstripBoth( $outText ) );
5023                 }
5024
5025                 return $outText;
5026         }
5027
5028         /**
5029          * This function returns the text of a section, specified by a number ($section).
5030          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
5031          * the first section before any such heading (section 0).
5032          *
5033          * If a section contains subsections, these are also returned.
5034          *
5035          * @param $text String: text to look in
5036          * @param $section Integer: section number
5037          * @param $deftext: default to return if section is not found
5038          * @return string text of the requested section
5039          */
5040         public function getSection( $text, $section, $deftext='' ) {
5041                 return $this->extractSections( $text, $section, "get", $deftext );
5042         }
5043
5044         public function replaceSection( $oldtext, $section, $text ) {
5045                 return $this->extractSections( $oldtext, $section, "replace", $text );
5046         }
5047
5048         /**
5049          * Get the timestamp associated with the current revision, adjusted for
5050          * the default server-local timestamp
5051          */
5052         function getRevisionTimestamp() {
5053                 if ( is_null( $this->mRevisionTimestamp ) ) {
5054                         wfProfileIn( __METHOD__ );
5055                         global $wgContLang;
5056                         $dbr = wfGetDB( DB_SLAVE );
5057                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
5058                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
5059
5060                         // Normalize timestamp to internal MW format for timezone processing.
5061                         // This has the added side-effect of replacing a null value with
5062                         // the current time, which gives us more sensible behavior for
5063                         // previews.
5064                         $timestamp = wfTimestamp( TS_MW, $timestamp );
5065
5066                         // The cryptic '' timezone parameter tells to use the site-default
5067                         // timezone offset instead of the user settings.
5068                         //
5069                         // Since this value will be saved into the parser cache, served
5070                         // to other users, and potentially even used inside links and such,
5071                         // it needs to be consistent for all visitors.
5072                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
5073
5074                         wfProfileOut( __METHOD__ );
5075                 }
5076                 return $this->mRevisionTimestamp;
5077         }
5078
5079         /**
5080          * Mutator for $mDefaultSort
5081          *
5082          * @param $sort New value
5083          */
5084         public function setDefaultSort( $sort ) {
5085                 $this->mDefaultSort = $sort;
5086         }
5087
5088         /**
5089          * Accessor for $mDefaultSort
5090          * Will use the title/prefixed title if none is set
5091          *
5092          * @return string
5093          */
5094         public function getDefaultSort() {
5095                 if( $this->mDefaultSort !== false ) {
5096                         return $this->mDefaultSort;
5097                 } else {
5098                         return $this->mTitle->getNamespace() == NS_CATEGORY
5099                                         ? $this->mTitle->getText()
5100                                         : $this->mTitle->getPrefixedText();
5101                 }
5102         }
5103
5104         /**
5105          * Try to guess the section anchor name based on a wikitext fragment
5106          * presumably extracted from a heading, for example "Header" from
5107          * "== Header ==".
5108          */
5109         public function guessSectionNameFromWikiText( $text ) {
5110                 # Strip out wikitext links(they break the anchor)
5111                 $text = $this->stripSectionName( $text );
5112                 $headline = Sanitizer::decodeCharReferences( $text );
5113                 # strip out HTML
5114                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
5115                 $headline = trim( $headline );
5116                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
5117                 $replacearray = array(
5118                         '%3A' => ':',
5119                         '%' => '.'
5120                 );
5121                 return str_replace(
5122                         array_keys( $replacearray ),
5123                         array_values( $replacearray ),
5124                         $sectionanchor );
5125         }
5126
5127         /**
5128          * Strips a text string of wikitext for use in a section anchor
5129          *
5130          * Accepts a text string and then removes all wikitext from the
5131          * string and leaves only the resultant text (i.e. the result of
5132          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5133          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5134          * to create valid section anchors by mimicing the output of the
5135          * parser when headings are parsed.
5136          *
5137          * @param $text string Text string to be stripped of wikitext
5138          * for use in a Section anchor
5139          * @return Filtered text string
5140          */
5141         public function stripSectionName( $text ) {
5142                 # Strip internal link markup
5143                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
5144                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
5145
5146                 # Strip external link markup (FIXME: Not Tolerant to blank link text
5147                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
5148                 # on how many empty links there are on the page - need to figure that out.
5149                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
5150
5151                 # Parse wikitext quotes (italics & bold)
5152                 $text = $this->doQuotes($text);
5153
5154                 # Strip HTML tags
5155                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5156                 return $text;
5157         }
5158
5159         /**
5160          * strip/replaceVariables/unstrip for preprocessor regression testing
5161          */
5162         function srvus( $text ) {
5163                 $text = $this->replaceVariables( $text );
5164                 $text = $this->mStripState->unstripBoth( $text );
5165                 return $text;
5166         }
5167 }
5168
5169 /**
5170  * @todo document, briefly.
5171  * @addtogroup Parser
5172  */
5173 class OnlyIncludeReplacer {
5174         var $output = '';
5175
5176         function replace( $matches ) {
5177                 if ( substr( $matches[1], -1 ) == "\n" ) {
5178                         $this->output .= substr( $matches[1], 0, -1 );
5179                 } else {
5180                         $this->output .= $matches[1];
5181                 }
5182         }
5183 }
5184
5185 /**
5186  * @todo document, briefly.
5187  * @addtogroup Parser
5188  */
5189 class StripState {
5190         var $general, $nowiki;
5191
5192         function __construct() {
5193                 $this->general = new ReplacementArray;
5194                 $this->nowiki = new ReplacementArray;
5195         }
5196
5197         function unstripGeneral( $text ) {
5198                 wfProfileIn( __METHOD__ );
5199                 do {
5200                         $oldText = $text;
5201                         $text = $this->general->replace( $text );
5202                 } while ( $text != $oldText );
5203                 wfProfileOut( __METHOD__ );
5204                 return $text;
5205         }
5206
5207         function unstripNoWiki( $text ) {
5208                 wfProfileIn( __METHOD__ );
5209                 do {
5210                         $oldText = $text;
5211                         $text = $this->nowiki->replace( $text );
5212                 } while ( $text != $oldText );
5213                 wfProfileOut( __METHOD__ );
5214                 return $text;
5215         }
5216
5217         function unstripBoth( $text ) {
5218                 wfProfileIn( __METHOD__ );
5219                 do {
5220                         $oldText = $text;
5221                         $text = $this->general->replace( $text );
5222                         $text = $this->nowiki->replace( $text );
5223                 } while ( $text != $oldText );
5224                 wfProfileOut( __METHOD__ );
5225                 return $text;
5226         }
5227 }
5228
5229 /**
5230  * An expansion frame, used as a context to expand the result of preprocessToDom()
5231  */
5232 class PPFrame {
5233         var $parser, $title;
5234
5235         const NO_ARGS = 1;
5236         const NO_TEMPLATES = 2;
5237         const RECOVER_ORIG = 3;
5238
5239         /**
5240          * Construct a new preprocessor frame.
5241          * @param Parser $parser The parent parser
5242          * @param Title $title The context title, or false if there isn't one
5243          */
5244         function __construct( $parser ) {
5245                 $this->parser = $parser;
5246                 $this->title = $parser->mTitle;
5247         }
5248
5249         /**
5250          * Create a new child frame
5251          * $args is optionally a DOMNodeList containing the template arguments
5252          */
5253         function newChild( $args = false, $title = false ) {
5254                 $assocArgs = array();
5255                 if ( $title === false ) {
5256                         $title = $this->title;
5257                 }
5258                 if ( $args !== false ) {
5259                         $xpath = false;
5260                         foreach ( $args as $arg ) {
5261                                 if ( !$xpath ) {
5262                                         $xpath = new DOMXPath( $arg->ownerDocument );
5263                                 }
5264
5265                                 $nameNodes = $xpath->query( 'name', $arg );
5266                                 if ( $nameNodes->item( 0 )->hasAttributes() ) {
5267                                         // Numbered parameter
5268                                         $name = $nameNodes->item( 0 )->attributes->getNamedItem( 'index' )->textContent;
5269                                 } else {
5270                                         // Named parameter
5271                                         $name = $this->expand( $nameNodes->item( 0 ) );
5272                                 }
5273
5274                                 $value = $xpath->query( 'value', $arg );
5275                                 $assocArgs[$name] = $value->item( 0 );
5276                         }
5277                 }
5278                 return new PPTemplateFrame( $this->parser, $this, $assocArgs, $title );
5279         }
5280
5281         /**
5282          * Expand a DOMNode describing a preprocessed document into plain wikitext,
5283          * using the current context
5284          * @param $root the node
5285          */
5286         function expand( $root, $shallowFlags = 0, $deepFlags = 0 ) {
5287                 if ( is_string( $root ) ) {
5288                         return $root;
5289                 }
5290
5291                 if ( $this->parser->ot['html']
5292                         && ++$this->parser->mPPNodeCount > $this->parser->mOptions->mMaxPPNodeCount )
5293                 {
5294                         return $this->parser->insertStripItem( '<!-- node-count limit exceeded -->' );
5295                 }
5296                 $flags = $shallowFlags | $deepFlags;
5297
5298                 if ( is_array( $root ) ) {
5299                         $s = '';
5300                         foreach ( $root as $node ) {
5301                                 $s .= $this->expand( $node, 0, $deepFlags );
5302                         }
5303                 } elseif ( $root instanceof DOMNodeList ) {
5304                         $s = '';
5305                         foreach ( $root as $node ) {
5306                                 $s .= $this->expand( $node, 0, $deepFlags );
5307                         }
5308                 } elseif ( $root instanceof DOMNode ) {
5309                         if ( $root->nodeType == XML_TEXT_NODE ) {
5310                                 $s = $root->nodeValue;
5311                         } elseif ( $root->nodeName == 'template' ) {
5312                                 # Double-brace expansion
5313                                 $xpath = new DOMXPath( $root->ownerDocument );
5314                                 $titles = $xpath->query( 'title', $root );
5315                                 $title = $titles->item( 0 );
5316                                 $parts = $xpath->query( 'part', $root );
5317                                 if ( $flags & self::NO_TEMPLATES ) {
5318                                         $s = '{{' . $this->implodeWithFlags( '|', 0, $deepFlags, $title, $parts ) . '}}';
5319                                 } else {
5320                                         $lineStart = $root->getAttribute( 'lineStart' );
5321                                         $params = array(
5322                                                 'title' => $title,
5323                                                 'parts' => $parts,
5324                                                 'lineStart' => $lineStart,
5325                                                 'text' => 'FIXME' );
5326                                         $s = $this->parser->braceSubstitution( $params, $this );
5327                                 }
5328                         } elseif ( $root->nodeName == 'tplarg' ) {
5329                                 # Triple-brace expansion
5330                                 $xpath = new DOMXPath( $root->ownerDocument );
5331                                 $titles = $xpath->query( 'title', $root );
5332                                 $title = $titles->item( 0 );
5333                                 $parts = $xpath->query( 'part', $root );
5334                                 if ( $flags & self::NO_ARGS || $this->parser->ot['msg'] ) {
5335                                         $s = '{{{' . $this->implode( '|', 0, $deepFlags, $title, $parts ) . '}}}';
5336                                 } else {
5337                                         $params = array( 'title' => $title, 'parts' => $parts, 'text' => 'FIXME' );
5338                                         $s = $this->parser->argSubstitution( $params, $this );
5339                                 }
5340                         } elseif ( $root->nodeName == 'ext' ) {
5341                                 # Extension tag
5342                                 $xpath = new DOMXPath( $root->ownerDocument );
5343                                 $names = $xpath->query( 'name', $root );
5344                                 $attrs = $xpath->query( 'attr', $root );
5345                                 $inners = $xpath->query( 'inner', $root );
5346                                 $closes = $xpath->query( 'close', $root );
5347                                 $params = array(
5348                                         'name' => $names->item( 0 ),
5349                                         'attr' => $attrs->length > 0 ? $attrs->item( 0 ) : null,
5350                                         'inner' => $inners->length > 0 ? $inners->item( 0 ) : null,
5351                                         'close' => $closes->length > 0 ? $closes->item( 0 ) : null,
5352                                 );
5353                                 $s = $this->parser->extensionSubstitution( $params, $this );
5354                         } elseif ( $root->nodeName == 'h' ) {
5355                                 # Heading
5356                                 $s = $this->expand( $root->childNodes, 0, $deepFlags );
5357
5358                                 if ( $this->parser->ot['html'] ) {
5359                                         # Insert heading index marker
5360                                         $headingIndex = $root->getAttribute( 'i' );
5361                                         $titleText = $this->title->getPrefixedDBkey();
5362                                         $this->parser->mHeadings[] = array( $titleText, $headingIndex );
5363                                         $serial = count( $this->parser->mHeadings ) - 1;
5364                                         $marker = "{$this->parser->mUniqPrefix}-h-$serial-{$this->parser->mMarkerSuffix}";
5365                                         $count = $root->getAttribute( 'level' );
5366
5367                                         // FIXME: bug-for-bug with old parser
5368                                         // Lose whitespace for no apparent reason
5369                                         // Remove this after differential testing is done
5370                                         if ( true ) {
5371                                                 // Good version
5372                                                 $s = substr( $s, 0, $count ) . $marker . substr( $s, $count );
5373                                         } else {
5374                                                 // Bad version
5375                                                 if ( preg_match( '/^(={1,6})(.*?)(={1,6})\s*?$/', $s, $m ) ) {
5376                                                         if ( $m[2] != '' ) {
5377                                                                 $s = $m[1] . $marker . $m[2] . $m[3];
5378                                                         }
5379                                                 }
5380                                         }
5381                                         $this->parser->mStripState->general->setPair( $marker, '' );
5382                                 }
5383                         } else {
5384                                 # Generic recursive expansion
5385                                 $s = '';
5386                                 for ( $node = $root->firstChild; $node; $node = $node->nextSibling ) {
5387                                         if ( $node->nodeType == XML_TEXT_NODE ) {
5388                                                 $s .= $node->nodeValue;
5389                                         } elseif ( $node->nodeType == XML_ELEMENT_NODE ) {
5390                                                 $s .= $this->expand( $node, 0, $deepFlags );
5391                                         }
5392                                 }
5393                         }
5394                 } else {
5395                         throw new MWException( __METHOD__.': Invalid parameter type' );
5396                 }
5397                 return $s;
5398         }
5399
5400         function implodeWithFlags( $sep, $shallowFlags, $deepFlags /*, ... */ ) {
5401                 $args = array_slice( func_get_args(), 3 );
5402
5403                 $first = true;
5404                 $s = '';
5405                 foreach ( $args as $root ) {
5406                         if ( !is_array( $root ) && !( $root instanceof DOMNodeList ) ) {
5407                                 $root = array( $root );
5408                         }
5409                         foreach ( $root as $node ) {
5410                                 if ( $first ) {
5411                                         $first = false;
5412                                 } else {
5413                                         $s .= $sep;
5414                                 }
5415                                 $s .= $this->expand( $node, $shallowFlags, $deepFlags );
5416                         }
5417                 }
5418                 return $s;
5419         }
5420
5421         function implode( $sep /*, ... */ ) {
5422                 $args = func_get_args();
5423                 $args = array_merge( array_slice( $args, 0, 1 ), array( 0, 0 ), array_slice( $args, 1 ) );
5424                 return call_user_func_array( array( $this, 'implodeWithFlags' ), $args );
5425         }
5426
5427         function __toString() {
5428                 return 'frame{}';
5429         }
5430 }
5431
5432 /**
5433  * Expansion frame with template arguments
5434  */
5435 class PPTemplateFrame extends PPFrame {
5436         public $parser, $args, $parent, $serial;
5437
5438         function __construct( $parser, $parent = false, $args = array(), $title = false ) {
5439                 $this->parser = $parser;
5440                 $this->parent = $parent;
5441                 $this->args = $args;
5442                 $this->title = $title;
5443         }
5444
5445         function __toString() {
5446                 $s = 'tplframe{';
5447                 $first = true;
5448                 foreach ( $this->args as $name => $value ) {
5449                         if ( $first ) {
5450                                 $first = false;
5451                         } else {
5452                                 $s .= ', ';
5453                         }
5454                         $s .= "\"$name\":\"" .
5455                                 str_replace( '"', '\\"', $value->ownerDocument->saveXML( $value ) ) . '"';
5456                 }
5457                 $s .= '}';
5458                 return $s;
5459         }
5460 }
5461