includes/Parser_OldPP.php

   1 <?php
   2 /**
   3  * Parser with old preprocessor
   4  */
   5 class Parser_OldPP
   6 {
   7         /**
   8          * Update this version number when the ParserOutput format
   9          * changes in an incompatible way, so the parser cache
  10          * can automatically discard old data.
  11          */
  12         const VERSION = '1.6.4';
  13
  14         # Flags for Parser::setFunctionHook
  15         # Also available as global constants from Defines.php
  16         const SFH_NO_HASH = 1;
  17
  18         # Constants needed for external link processing
  19         # Everything except bracket, space, or control characters
  20         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  21         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)\\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/S';
  22
  23         // State constants for the definition list colon extraction
  24         const COLON_STATE_TEXT = 0;
  25         const COLON_STATE_TAG = 1;
  26         const COLON_STATE_TAGSTART = 2;
  27         const COLON_STATE_CLOSETAG = 3;
  28         const COLON_STATE_TAGSLASH = 4;
  29         const COLON_STATE_COMMENT = 5;
  30         const COLON_STATE_COMMENTDASH = 6;
  31         const COLON_STATE_COMMENTDASHDASH = 7;
  32
  33         /**#@+
  34          * @private
  35          */
  36         # Persistent:
  37         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  38                 $mImageParams, $mImageParamsMagicArray, $mExtLinkBracketedRegex;
  39
  40         # Cleared with clearState():
  41         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
  42         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
  43         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
  44         var $mIncludeSizes, $mDefaultSort;
  45         var $mTemplates,        // cache of already loaded templates, avoids
  46                                 // multiple SQL queries for the same string
  47             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
  48                                 // in this path. Used for loop detection.
  49
  50         # Temporary
  51         # These are variables reset at least once per parse regardless of $clearState
  52         var $mOptions,      // ParserOptions object
  53                 $mTitle,        // Title context, used for self-link rendering and similar things
  54                 $mOutputType,   // Output type, one of the OT_xxx constants
  55                 $ot,            // Shortcut alias, see setOutputType()
  56                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
  57                 $mRevisionTimestamp, // The timestamp of the specified revision ID
  58                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
  59
  60         /**#@-*/
  61
  62         /**
  63          * Constructor
  64          *
  65          * @public
  66          */
  67         function __construct( $conf = array() ) {
  68                 $this->mTagHooks = array();
  69                 $this->mTransparentTagHooks = array();
  70                 $this->mFunctionHooks = array();
  71                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
  72                 $this->mFirstCall = true;
  73                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
  74                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
  75         }
  76
  77         /**
  78          * Do various kinds of initialisation on the first call of the parser
  79          */
  80         function firstCallInit() {
  81                 if ( !$this->mFirstCall ) {
  82                         return;
  83                 }
  84                 $this->mFirstCall = false;
  85
  86                 wfProfileIn( __METHOD__ );
  87                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  88
  89                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
  90
  91                 # Syntax for arguments (see self::setFunctionHook):
  92                 #  "name for lookup in localized magic words array",
  93                 #  function callback,
  94                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}
  95                 #    instead of {{#int:...}})
  96                 $this->setFunctionHook( 'int',              array( 'CoreParserFunctions', 'intFunction'      ), SFH_NO_HASH );
  97                 $this->setFunctionHook( 'ns',               array( 'CoreParserFunctions', 'ns'               ), SFH_NO_HASH );
  98                 $this->setFunctionHook( 'urlencode',        array( 'CoreParserFunctions', 'urlencode'        ), SFH_NO_HASH );
  99                 $this->setFunctionHook( 'lcfirst',          array( 'CoreParserFunctions', 'lcfirst'          ), SFH_NO_HASH );
 100                 $this->setFunctionHook( 'ucfirst',          array( 'CoreParserFunctions', 'ucfirst'          ), SFH_NO_HASH );
 101                 $this->setFunctionHook( 'lc',               array( 'CoreParserFunctions', 'lc'               ), SFH_NO_HASH );
 102                 $this->setFunctionHook( 'uc',               array( 'CoreParserFunctions', 'uc'               ), SFH_NO_HASH );
 103                 $this->setFunctionHook( 'localurl',         array( 'CoreParserFunctions', 'localurl'         ), SFH_NO_HASH );
 104                 $this->setFunctionHook( 'localurle',        array( 'CoreParserFunctions', 'localurle'        ), SFH_NO_HASH );
 105                 $this->setFunctionHook( 'fullurl',          array( 'CoreParserFunctions', 'fullurl'          ), SFH_NO_HASH );
 106                 $this->setFunctionHook( 'fullurle',         array( 'CoreParserFunctions', 'fullurle'         ), SFH_NO_HASH );
 107                 $this->setFunctionHook( 'formatnum',        array( 'CoreParserFunctions', 'formatnum'        ), SFH_NO_HASH );
 108                 $this->setFunctionHook( 'grammar',          array( 'CoreParserFunctions', 'grammar'          ), SFH_NO_HASH );
 109                 $this->setFunctionHook( 'plural',           array( 'CoreParserFunctions', 'plural'           ), SFH_NO_HASH );
 110                 $this->setFunctionHook( 'numberofpages',    array( 'CoreParserFunctions', 'numberofpages'    ), SFH_NO_HASH );
 111                 $this->setFunctionHook( 'numberofusers',    array( 'CoreParserFunctions', 'numberofusers'    ), SFH_NO_HASH );
 112                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 113                 $this->setFunctionHook( 'numberoffiles',    array( 'CoreParserFunctions', 'numberoffiles'    ), SFH_NO_HASH );
 114                 $this->setFunctionHook( 'numberofadmins',   array( 'CoreParserFunctions', 'numberofadmins'   ), SFH_NO_HASH );
 115                 $this->setFunctionHook( 'numberofedits',    array( 'CoreParserFunctions', 'numberofedits'    ), SFH_NO_HASH );
 116                 $this->setFunctionHook( 'language',         array( 'CoreParserFunctions', 'language'         ), SFH_NO_HASH );
 117                 $this->setFunctionHook( 'padleft',          array( 'CoreParserFunctions', 'padleft'          ), SFH_NO_HASH );
 118                 $this->setFunctionHook( 'padright',         array( 'CoreParserFunctions', 'padright'         ), SFH_NO_HASH );
 119                 $this->setFunctionHook( 'anchorencode',     array( 'CoreParserFunctions', 'anchorencode'     ), SFH_NO_HASH );
 120                 $this->setFunctionHook( 'special',          array( 'CoreParserFunctions', 'special'          ) );
 121                 $this->setFunctionHook( 'defaultsort',      array( 'CoreParserFunctions', 'defaultsort'      ), SFH_NO_HASH );
 122                 $this->setFunctionHook( 'filepath',         array( 'CoreParserFunctions', 'filepath'         ), SFH_NO_HASH );
 123
 124                 if ( $wgAllowDisplayTitle ) {
 125                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 126                 }
 127                 if ( $wgAllowSlowParserFunctions ) {
 128                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 129                 }
 130
 131                 $this->initialiseVariables();
 132
 133                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 134                 wfProfileOut( __METHOD__ );
 135         }
 136
 137         /**
 138          * Clear Parser state
 139          *
 140          * @private
 141          */
 142         function clearState() {
 143                 wfProfileIn( __METHOD__ );
 144                 if ( $this->mFirstCall ) {
 145                         $this->firstCallInit();
 146                 }
 147                 $this->mOutput = new ParserOutput;
 148                 $this->mAutonumber = 0;
 149                 $this->mLastSection = '';
 150                 $this->mDTopen = false;
 151                 $this->mIncludeCount = array();
 152                 $this->mStripState = new StripState;
 153                 $this->mArgStack = array();
 154                 $this->mInPre = false;
 155                 $this->mInterwikiLinkHolders = array(
 156                         'texts' => array(),
 157                         'titles' => array()
 158                 );
 159                 $this->mLinkHolders = array(
 160                         'namespaces' => array(),
 161                         'dbkeys' => array(),
 162                         'queries' => array(),
 163                         'texts' => array(),
 164                         'titles' => array()
 165                 );
 166                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 167
 168                 /**
 169                  * Prefix for temporary replacement strings for the multipass parser.
 170                  * \x07 should never appear in input as it's disallowed in XML.
 171                  * Using it at the front also gives us a little extra robustness
 172                  * since it shouldn't match when butted up against identifier-like
 173                  * string constructs.
 174                  */
 175                 $this->mUniqPrefix = "\x07UNIQ" . self::getRandomString();
 176
 177                 # Clear these on every parse, bug 4549
 178                 $this->mTemplates = array();
 179                 $this->mTemplatePath = array();
 180
 181                 $this->mShowToc = true;
 182                 $this->mForceTocPosition = false;
 183                 $this->mIncludeSizes = array(
 184                         'pre-expand' => 0,
 185                         'post-expand' => 0,
 186                         'arg' => 0
 187                 );
 188                 $this->mDefaultSort = false;
 189
 190                 wfRunHooks( 'ParserClearState', array( &$this ) );
 191                 wfProfileOut( __METHOD__ );
 192         }
 193
 194         function setOutputType( $ot ) {
 195                 $this->mOutputType = $ot;
 196                 // Shortcut alias
 197                 $this->ot = array(
 198                         'html' => $ot == OT_HTML,
 199                         'wiki' => $ot == OT_WIKI,
 200                         'msg' => $ot == OT_MSG,
 201                         'pre' => $ot == OT_PREPROCESS,
 202                 );
 203         }
 204
 205         /**
 206          * Accessor for mUniqPrefix.
 207          *
 208          * @public
 209          */
 210         function uniqPrefix() {
 211                 return $this->mUniqPrefix;
 212         }
 213
 214         /**
 215          * Convert wikitext to HTML
 216          * Do not call this function recursively.
 217          *
 218          * @param string $text Text we want to parse
 219          * @param Title &$title A title object
 220          * @param array $options
 221          * @param boolean $linestart
 222          * @param boolean $clearState
 223          * @param int $revid number to pass in {{REVISIONID}}
 224          * @return ParserOutput a ParserOutput
 225          */
 226         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 227                 /**
 228                  * First pass--just handle <nowiki> sections, pass the rest off
 229                  * to internalParse() which does all the real work.
 230                  */
 231
 232                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 233                 $fname = 'Parser::parse-' . wfGetCaller();
 234                 wfProfileIn( __METHOD__ );
 235                 wfProfileIn( $fname );
 236
 237                 if ( $clearState ) {
 238                         $this->clearState();
 239                 }
 240
 241                 $this->mOptions = $options;
 242                 $this->mTitle =& $title;
 243                 $oldRevisionId = $this->mRevisionId;
 244                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 245                 if( $revid !== null ) {
 246                         $this->mRevisionId = $revid;
 247                         $this->mRevisionTimestamp = null;
 248                 }
 249                 $this->setOutputType( OT_HTML );
 250                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 251                 $text = $this->strip( $text, $this->mStripState );
 252                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 253                 $text = $this->internalParse( $text );
 254                 $text = $this->mStripState->unstripGeneral( $text );
 255
 256                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 257                 $fixtags = array(
 258                         # french spaces, last one Guillemet-left
 259                         # only if there is something before the space
 260                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 261                         # french spaces, Guillemet-right
 262                         '/(\\302\\253) /' => '\\1&nbsp;',
 263                 );
 264                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 265
 266                 # only once and last
 267                 $text = $this->doBlockLevels( $text, $linestart );
 268
 269                 $this->replaceLinkHolders( $text );
 270
 271                 # the position of the parserConvert() call should not be changed. it
 272                 # assumes that the links are all replaced and the only thing left
 273                 # is the <nowiki> mark.
 274                 # Side-effects: this calls $this->mOutput->setTitleText()
 275                 $text = $wgContLang->parserConvert( $text, $this );
 276
 277                 $text = $this->mStripState->unstripNoWiki( $text );
 278
 279                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 280
 281 //!JF Move to its own function
 282
 283                 $uniq_prefix = $this->mUniqPrefix;
 284                 $matches = array();
 285                 $elements = array_keys( $this->mTransparentTagHooks );
 286                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 287
 288                 foreach( $matches as $marker => $data ) {
 289                         list( $element, $content, $params, $tag ) = $data;
 290                         $tagName = strtolower( $element );
 291                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 292                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 293                                         array( $content, $params, $this ) );
 294                         } else {
 295                                 $output = $tag;
 296                         }
 297                         $this->mStripState->general->setPair( $marker, $output );
 298                 }
 299                 $text = $this->mStripState->unstripGeneral( $text );
 300
 301                 $text = Sanitizer::normalizeCharReferences( $text );
 302
 303                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 304                         $text = self::tidy($text);
 305                 } else {
 306                         # attempt to sanitize at least some nesting problems
 307                         # (bug #2702 and quite a few others)
 308                         $tidyregs = array(
 309                                 # ''Something [http://www.cool.com cool''] -->
 310                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 311                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 312                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 313                                 # fix up an anchor inside another anchor, only
 314                                 # at least for a single single nested link (bug 3695)
 315                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 316                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 317                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 318                                 # contains a div, so fix it up here; replace
 319                                 # div with escaped text
 320                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 321                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 322                                 # remove empty italic or bold tag pairs, some
 323                                 # introduced by rules above
 324                                 '/<([bi])><\/\\1>/' => '',
 325                         );
 326
 327                         $text = preg_replace(
 328                                 array_keys( $tidyregs ),
 329                                 array_values( $tidyregs ),
 330                                 $text );
 331                 }
 332
 333                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 334
 335                 # Information on include size limits, for the benefit of users who try to skirt them
 336                 if ( $this->mOptions->getEnableLimitReport() ) {
 337                         $max = $this->mOptions->getMaxIncludeSize();
 338                         $limitReport =
 339                                 "Pre-expand include size: {$this->mIncludeSizes['pre-expand']}/$max bytes\n" .
 340                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 341                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n";
 342                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 343                         $text .= "<!-- \n$limitReport-->\n";
 344                 }
 345                 $this->mOutput->setText( $text );
 346                 $this->mRevisionId = $oldRevisionId;
 347                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 348                 wfProfileOut( $fname );
 349                 wfProfileOut( __METHOD__ );
 350
 351                 return $this->mOutput;
 352         }
 353
 354         /**
 355          * Recursive parser entry point that can be called from an extension tag
 356          * hook.
 357          */
 358         function recursiveTagParse( $text ) {
 359                 wfProfileIn( __METHOD__ );
 360                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 361                 $text = $this->strip( $text, $this->mStripState );
 362                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 363                 $text = $this->internalParse( $text );
 364                 wfProfileOut( __METHOD__ );
 365                 return $text;
 366         }
 367
 368         /**
 369          * Expand templates and variables in the text, producing valid, static wikitext.
 370          * Also removes comments.
 371          */
 372         function preprocess( $text, $title, $options, $revid = null ) {
 373                 wfProfileIn( __METHOD__ );
 374                 $this->clearState();
 375                 $this->setOutputType( OT_PREPROCESS );
 376                 $this->mOptions = $options;
 377                 $this->mTitle = $title;
 378                 if( $revid !== null ) {
 379                         $this->mRevisionId = $revid;
 380                 }
 381                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 382                 $text = $this->strip( $text, $this->mStripState );
 383                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 384                 if ( $this->mOptions->getRemoveComments() ) {
 385                         $text = Sanitizer::removeHTMLcomments( $text );
 386                 }
 387                 $text = $this->replaceVariables( $text );
 388                 $text = $this->mStripState->unstripBoth( $text );
 389                 wfProfileOut( __METHOD__ );
 390                 return $text;
 391         }
 392
 393         /**
 394          * Get a random string
 395          *
 396          * @private
 397          * @static
 398          */
 399         function getRandomString() {
 400                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 401         }
 402
 403         function &getTitle() { return $this->mTitle; }
 404         function getOptions() { return $this->mOptions; }
 405
 406         function getFunctionLang() {
 407                 global $wgLang, $wgContLang;
 408                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 409         }
 410
 411         /**
 412          * Replaces all occurrences of HTML-style comments and the given tags
 413          * in the text with a random marker and returns teh next text. The output
 414          * parameter $matches will be an associative array filled with data in
 415          * the form:
 416          *   'UNIQ-xxxxx' => array(
 417          *     'element',
 418          *     'tag content',
 419          *     array( 'param' => 'x' ),
 420          *     '<element param="x">tag content</element>' ) )
 421          *
 422          * @param $elements list of element names. Comments are always extracted.
 423          * @param $text Source text string.
 424          * @param $uniq_prefix
 425          *
 426          * @public
 427          * @static
 428          */
 429         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 430                 static $n = 1;
 431                 $stripped = '';
 432                 $matches = array();
 433
 434                 $taglist = implode( '|', $elements );
 435                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 436
 437                 while ( '' != $text ) {
 438                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 439                         $stripped .= $p[0];
 440                         if( count( $p ) < 5 ) {
 441                                 break;
 442                         }
 443                         if( count( $p ) > 5 ) {
 444                                 // comment
 445                                 $element    = $p[4];
 446                                 $attributes = '';
 447                                 $close      = '';
 448                                 $inside     = $p[5];
 449                         } else {
 450                                 // tag
 451                                 $element    = $p[1];
 452                                 $attributes = $p[2];
 453                                 $close      = $p[3];
 454                                 $inside     = $p[4];
 455                         }
 456
 457                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . "-QINU\x07";
 458                         $stripped .= $marker;
 459
 460                         if ( $close === '/>' ) {
 461                                 // Empty element tag, <tag />
 462                                 $content = null;
 463                                 $text = $inside;
 464                                 $tail = null;
 465                         } else {
 466                                 if( $element == '!--' ) {
 467                                         $end = '/(-->)/';
 468                                 } else {
 469                                         $end = "/(<\\/$element\\s*>)/i";
 470                                 }
 471                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 472                                 $content = $q[0];
 473                                 if( count( $q ) < 3 ) {
 474                                         # No end tag -- let it run out to the end of the text.
 475                                         $tail = '';
 476                                         $text = '';
 477                                 } else {
 478                                         $tail = $q[1];
 479                                         $text = $q[2];
 480                                 }
 481                         }
 482
 483                         $matches[$marker] = array( $element,
 484                                 $content,
 485                                 Sanitizer::decodeTagAttributes( $attributes ),
 486                                 "<$element$attributes$close$content$tail" );
 487                 }
 488                 return $stripped;
 489         }
 490
 491         /**
 492          * Strips and renders nowiki, pre, math, hiero
 493          * If $render is set, performs necessary rendering operations on plugins
 494          * Returns the text, and fills an array with data needed in unstrip()
 495          *
 496          * @param StripState $state
 497          *
 498          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 499          *  will be stripped in addition to other tags. This is important
 500          *  for section editing, where these comments cause confusion when
 501          *  counting the sections in the wikisource
 502          *
 503          * @param array dontstrip contains tags which should not be stripped;
 504          *  used to prevent stipping of <gallery> when saving (fixes bug 2700)
 505          *
 506          * @private
 507          */
 508         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 509                 global $wgContLang;
 510                 wfProfileIn( __METHOD__ );
 511                 $render = ($this->mOutputType == OT_HTML);
 512
 513                 $uniq_prefix = $this->mUniqPrefix;
 514                 $commentState = new ReplacementArray;
 515                 $nowikiItems = array();
 516                 $generalItems = array();
 517
 518                 $elements = array_merge(
 519                         array( 'nowiki', 'gallery' ),
 520                         array_keys( $this->mTagHooks ) );
 521                 global $wgRawHtml;
 522                 if( $wgRawHtml ) {
 523                         $elements[] = 'html';
 524                 }
 525                 if( $this->mOptions->getUseTeX() ) {
 526                         $elements[] = 'math';
 527                 }
 528
 529                 # Removing $dontstrip tags from $elements list (currently only 'gallery', fixing bug 2700)
 530                 foreach ( $elements AS $k => $v ) {
 531                         if ( !in_array ( $v , $dontstrip ) ) continue;
 532                         unset ( $elements[$k] );
 533                 }
 534
 535                 $matches = array();
 536                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 537
 538                 foreach( $matches as $marker => $data ) {
 539                         list( $element, $content, $params, $tag ) = $data;
 540                         if( $render ) {
 541                                 $tagName = strtolower( $element );
 542                                 wfProfileIn( __METHOD__."-render-$tagName" );
 543                                 switch( $tagName ) {
 544                                 case '!--':
 545                                         // Comment
 546                                         if( substr( $tag, -3 ) == '-->' ) {
 547                                                 $output = $tag;
 548                                         } else {
 549                                                 // Unclosed comment in input.
 550                                                 // Close it so later stripping can remove it
 551                                                 $output = "$tag-->";
 552                                         }
 553                                         break;
 554                                 case 'html':
 555                                         if( $wgRawHtml ) {
 556                                                 $output = $content;
 557                                                 break;
 558                                         }
 559                                         // Shouldn't happen otherwise. :)
 560                                 case 'nowiki':
 561                                         $output = Xml::escapeTagsOnly( $content );
 562                                         break;
 563                                 case 'math':
 564                                         $output = $wgContLang->armourMath(
 565                                                 MathRenderer::renderMath( $content, $params ) );
 566                                         break;
 567                                 case 'gallery':
 568                                         $output = $this->renderImageGallery( $content, $params );
 569                                         break;
 570                                 default:
 571                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 572                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 573                                                         array( $content, $params, $this ) );
 574                                         } else {
 575                                                 throw new MWException( "Invalid call hook $element" );
 576                                         }
 577                                 }
 578                                 wfProfileOut( __METHOD__."-render-$tagName" );
 579                         } else {
 580                                 // Just stripping tags; keep the source
 581                                 $output = $tag;
 582                         }
 583
 584                         // Unstrip the output, to support recursive strip() calls
 585                         $output = $state->unstripBoth( $output );
 586
 587                         if( !$stripcomments && $element == '!--' ) {
 588                                 $commentState->setPair( $marker, $output );
 589                         } elseif ( $element == 'html' || $element == 'nowiki' ) {
 590                                 $nowikiItems[$marker] = $output;
 591                         } else {
 592                                 $generalItems[$marker] = $output;
 593                         }
 594                 }
 595                 # Add the new items to the state
 596                 # We do this after the loop instead of during it to avoid slowing
 597                 # down the recursive unstrip
 598                 $state->nowiki->mergeArray( $nowikiItems );
 599                 $state->general->mergeArray( $generalItems );
 600
 601                 # Unstrip comments unless explicitly told otherwise.
 602                 # (The comments are always stripped prior to this point, so as to
 603                 # not invoke any extension tags / parser hooks contained within
 604                 # a comment.)
 605                 if ( !$stripcomments ) {
 606                         // Put them all back and forget them
 607                         $text = $commentState->replace( $text );
 608                 }
 609
 610                 wfProfileOut( __METHOD__ );
 611                 return $text;
 612         }
 613
 614         /**
 615          * Restores pre, math, and other extensions removed by strip()
 616          *
 617          * always call unstripNoWiki() after this one
 618          * @private
 619          * @deprecated use $this->mStripState->unstrip()
 620          */
 621         function unstrip( $text, $state ) {
 622                 return $state->unstripGeneral( $text );
 623         }
 624
 625         /**
 626          * Always call this after unstrip() to preserve the order
 627          *
 628          * @private
 629          * @deprecated use $this->mStripState->unstrip()
 630          */
 631         function unstripNoWiki( $text, $state ) {
 632                 return $state->unstripNoWiki( $text );
 633         }
 634
 635         /**
 636          * @deprecated use $this->mStripState->unstripBoth()
 637          */
 638         function unstripForHTML( $text ) {
 639                 return $this->mStripState->unstripBoth( $text );
 640         }
 641
 642         /**
 643          * Add an item to the strip state
 644          * Returns the unique tag which must be inserted into the stripped text
 645          * The tag will be replaced with the original text in unstrip()
 646          *
 647          * @private
 648          */
 649         function insertStripItem( $text, &$state ) {
 650                 $rnd = $this->mUniqPrefix . '-item' . self::getRandomString();
 651                 $state->general->setPair( $rnd, $text );
 652                 return $rnd;
 653         }
 654
 655         /**
 656          * Interface with html tidy, used if $wgUseTidy = true.
 657          * If tidy isn't able to correct the markup, the original will be
 658          * returned in all its glory with a warning comment appended.
 659          *
 660          * Either the external tidy program or the in-process tidy extension
 661          * will be used depending on availability. Override the default
 662          * $wgTidyInternal setting to disable the internal if it's not working.
 663          *
 664          * @param string $text Hideous HTML input
 665          * @return string Corrected HTML output
 666          * @public
 667          * @static
 668          */
 669         function tidy( $text ) {
 670                 global $wgTidyInternal;
 671                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 672 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 673 '<head><title>test</title></head><body>'.$text.'</body></html>';
 674                 if( $wgTidyInternal ) {
 675                         $correctedtext = self::internalTidy( $wrappedtext );
 676                 } else {
 677                         $correctedtext = self::externalTidy( $wrappedtext );
 678                 }
 679                 if( is_null( $correctedtext ) ) {
 680                         wfDebug( "Tidy error detected!\n" );
 681                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 682                 }
 683                 return $correctedtext;
 684         }
 685
 686         /**
 687          * Spawn an external HTML tidy process and get corrected markup back from it.
 688          *
 689          * @private
 690          * @static
 691          */
 692         function externalTidy( $text ) {
 693                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 694                 $fname = 'Parser::externalTidy';
 695                 wfProfileIn( $fname );
 696
 697                 $cleansource = '';
 698                 $opts = ' -utf8';
 699
 700                 $descriptorspec = array(
 701                         0 => array('pipe', 'r'),
 702                         1 => array('pipe', 'w'),
 703                         2 => array('file', wfGetNull(), 'a')
 704                 );
 705                 $pipes = array();
 706                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 707                 if (is_resource($process)) {
 708                         // Theoretically, this style of communication could cause a deadlock
 709                         // here. If the stdout buffer fills up, then writes to stdin could
 710                         // block. This doesn't appear to happen with tidy, because tidy only
 711                         // writes to stdout after it's finished reading from stdin. Search
 712                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 713                         fwrite($pipes[0], $text);
 714                         fclose($pipes[0]);
 715                         while (!feof($pipes[1])) {
 716                                 $cleansource .= fgets($pipes[1], 1024);
 717                         }
 718                         fclose($pipes[1]);
 719                         proc_close($process);
 720                 }
 721
 722                 wfProfileOut( $fname );
 723
 724                 if( $cleansource == '' && $text != '') {
 725                         // Some kind of error happened, so we couldn't get the corrected text.
 726                         // Just give up; we'll use the source text and append a warning.
 727                         return null;
 728                 } else {
 729                         return $cleansource;
 730                 }
 731         }
 732
 733         /**
 734          * Use the HTML tidy PECL extension to use the tidy library in-process,
 735          * saving the overhead of spawning a new process.
 736          *
 737          * 'pear install tidy' should be able to compile the extension module.
 738          *
 739          * @private
 740          * @static
 741          */
 742         function internalTidy( $text ) {
 743                 global $wgTidyConf, $IP;
 744                 $fname = 'Parser::internalTidy';
 745                 wfProfileIn( $fname );
 746
 747                 $tidy = new tidy;
 748                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 749                 $tidy->cleanRepair();
 750                 if( $tidy->getStatus() == 2 ) {
 751                         // 2 is magic number for fatal error
 752                         // http://www.php.net/manual/en/function.tidy-get-status.php
 753                         $cleansource = null;
 754                 } else {
 755                         $cleansource = tidy_get_output( $tidy );
 756                 }
 757                 wfProfileOut( $fname );
 758                 return $cleansource;
 759         }
 760
 761         /**
 762          * parse the wiki syntax used to render tables
 763          *
 764          * @private
 765          */
 766         function doTableStuff ( $text ) {
 767                 $fname = 'Parser::doTableStuff';
 768                 wfProfileIn( $fname );
 769
 770                 $lines = explode ( "\n" , $text );
 771                 $td_history = array (); // Is currently a td tag open?
 772                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 773                 $tr_history = array (); // Is currently a tr tag open?
 774                 $tr_attributes = array (); // history of tr attributes
 775                 $has_opened_tr = array(); // Did this table open a <tr> element?
 776                 $indent_level = 0; // indent level of the table
 777                 foreach ( $lines as $key => $line )
 778                 {
 779                         $line = trim ( $line );
 780
 781                         if( $line == '' ) { // empty line, go to next line
 782                                 continue;
 783                         }
 784                         $first_character = $line{0};
 785                         $matches = array();
 786
 787                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 788                                 // First check if we are starting a new table
 789                                 $indent_level = strlen( $matches[1] );
 790
 791                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 792                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 793
 794                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 795                                 array_push ( $td_history , false );
 796                                 array_push ( $last_tag_history , '' );
 797                                 array_push ( $tr_history , false );
 798                                 array_push ( $tr_attributes , '' );
 799                                 array_push ( $has_opened_tr , false );
 800                         } else if ( count ( $td_history ) == 0 ) {
 801                                 // Don't do any of the following
 802                                 continue;
 803                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 804                                 // We are ending a table
 805                                 $line = '</table>' . substr ( $line , 2 );
 806                                 $last_tag = array_pop ( $last_tag_history );
 807
 808                                 if ( !array_pop ( $has_opened_tr ) ) {
 809                                         $line = "<tr><td></td></tr>{$line}";
 810                                 }
 811
 812                                 if ( array_pop ( $tr_history ) ) {
 813                                         $line = "</tr>{$line}";
 814                                 }
 815
 816                                 if ( array_pop ( $td_history ) ) {
 817                                         $line = "</{$last_tag}>{$line}";
 818                                 }
 819                                 array_pop ( $tr_attributes );
 820                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 821                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 822                                 // Now we have a table row
 823                                 $line = preg_replace( '#^\|-+#', '', $line );
 824
 825                                 // Whats after the tag is now only attributes
 826                                 $attributes = $this->mStripState->unstripBoth( $line );
 827                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 828                                 array_pop ( $tr_attributes );
 829                                 array_push ( $tr_attributes , $attributes );
 830
 831                                 $line = '';
 832                                 $last_tag = array_pop ( $last_tag_history );
 833                                 array_pop ( $has_opened_tr );
 834                                 array_push ( $has_opened_tr , true );
 835
 836                                 if ( array_pop ( $tr_history ) ) {
 837                                         $line = '</tr>';
 838                                 }
 839
 840                                 if ( array_pop ( $td_history ) ) {
 841                                         $line = "</{$last_tag}>{$line}";
 842                                 }
 843
 844                                 $lines[$key] = $line;
 845                                 array_push ( $tr_history , false );
 846                                 array_push ( $td_history , false );
 847                                 array_push ( $last_tag_history , '' );
 848                         }
 849                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 850                                 // This might be cell elements, td, th or captions
 851                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 852                                         $first_character = '+';
 853                                         $line = substr ( $line , 1 );
 854                                 }
 855
 856                                 $line = substr ( $line , 1 );
 857
 858                                 if ( $first_character == '!' ) {
 859                                         $line = str_replace ( '!!' , '||' , $line );
 860                                 }
 861
 862                                 // Split up multiple cells on the same line.
 863                                 // FIXME : This can result in improper nesting of tags processed
 864                                 // by earlier parser steps, but should avoid splitting up eg
 865                                 // attribute values containing literal "||".
 866                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 867
 868                                 $lines[$key] = '';
 869
 870                                 // Loop through each table cell
 871                                 foreach ( $cells as $cell )
 872                                 {
 873                                         $previous = '';
 874                                         if ( $first_character != '+' )
 875                                         {
 876                                                 $tr_after = array_pop ( $tr_attributes );
 877                                                 if ( !array_pop ( $tr_history ) ) {
 878                                                         $previous = "<tr{$tr_after}>\n";
 879                                                 }
 880                                                 array_push ( $tr_history , true );
 881                                                 array_push ( $tr_attributes , '' );
 882                                                 array_pop ( $has_opened_tr );
 883                                                 array_push ( $has_opened_tr , true );
 884                                         }
 885
 886                                         $last_tag = array_pop ( $last_tag_history );
 887
 888                                         if ( array_pop ( $td_history ) ) {
 889                                                 $previous = "</{$last_tag}>{$previous}";
 890                                         }
 891
 892                                         if ( $first_character == '|' ) {
 893                                                 $last_tag = 'td';
 894                                         } else if ( $first_character == '!' ) {
 895                                                 $last_tag = 'th';
 896                                         } else if ( $first_character == '+' ) {
 897                                                 $last_tag = 'caption';
 898                                         } else {
 899                                                 $last_tag = '';
 900                                         }
 901
 902                                         array_push ( $last_tag_history , $last_tag );
 903
 904                                         // A cell could contain both parameters and data
 905                                         $cell_data = explode ( '|' , $cell , 2 );
 906
 907                                         // Bug 553: Note that a '|' inside an invalid link should not
 908                                         // be mistaken as delimiting cell parameters
 909                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 910                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 911                                         } else if ( count ( $cell_data ) == 1 )
 912                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 913                                         else {
 914                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 915                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 916                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 917                                         }
 918
 919                                         $lines[$key] .= $cell;
 920                                         array_push ( $td_history , true );
 921                                 }
 922                         }
 923                 }
 924
 925                 // Closing open td, tr && table
 926                 while ( count ( $td_history ) > 0 )
 927                 {
 928                         if ( array_pop ( $td_history ) ) {
 929                                 $lines[] = '</td>' ;
 930                         }
 931                         if ( array_pop ( $tr_history ) ) {
 932                                 $lines[] = '</tr>' ;
 933                         }
 934                         if ( !array_pop ( $has_opened_tr ) ) {
 935                                 $lines[] = "<tr><td></td></tr>" ;
 936                         }
 937
 938                         $lines[] = '</table>' ;
 939                 }
 940
 941                 $output = implode ( "\n" , $lines ) ;
 942
 943                 // special case: don't return empty table
 944                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 945                         $output = '';
 946                 }
 947
 948                 wfProfileOut( $fname );
 949
 950                 return $output;
 951         }
 952
 953         /**
 954          * Helper function for parse() that transforms wiki markup into
 955          * HTML. Only called for $mOutputType == OT_HTML.
 956          *
 957          * @private
 958          */
 959         function internalParse( $text ) {
 960                 $args = array();
 961                 $isMain = true;
 962                 $fname = 'Parser::internalParse';
 963                 wfProfileIn( $fname );
 964
 965                 # Hook to suspend the parser in this state
 966                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 967                         wfProfileOut( $fname );
 968                         return $text ;
 969                 }
 970
 971                 # Remove <noinclude> tags and <includeonly> sections
 972                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 973                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 974                 $text = StringUtils::delimiterReplace( '<includeonly>', '</includeonly>', '', $text );
 975
 976                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), array(), array_keys( $this->mTransparentTagHooks ) );
 977
 978                 $text = $this->replaceVariables( $text, $args );
 979                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 980
 981                 // Tables need to come after variable replacement for things to work
 982                 // properly; putting them before other transformations should keep
 983                 // exciting things like link expansions from showing up in surprising
 984                 // places.
 985                 $text = $this->doTableStuff( $text );
 986
 987                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 988
 989                 $text = $this->stripToc( $text );
 990                 $this->stripNoGallery( $text );
 991                 $text = $this->doHeadings( $text );
 992                 if($this->mOptions->getUseDynamicDates()) {
 993                         $df =& DateFormatter::getInstance();
 994                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 995                 }
 996                 $text = $this->doAllQuotes( $text );
 997                 $text = $this->replaceInternalLinks( $text );
 998                 $text = $this->replaceExternalLinks( $text );
 999
1000                 # replaceInternalLinks may sometimes leave behind
1001                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1002                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
1003
1004                 $text = $this->doMagicLinks( $text );
1005                 $text = $this->formatHeadings( $text, $isMain );
1006
1007                 wfProfileOut( $fname );
1008                 return $text;
1009         }
1010
1011         /**
1012          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1013          * magic external links.
1014          *
1015          * @private
1016          */
1017         function &doMagicLinks( &$text ) {
1018                 wfProfileIn( __METHOD__ );
1019                 $text = preg_replace_callback(
1020                         '!(?:                           # Start cases
1021                             <a.*?</a> |                 # Skip link text
1022                             <.*?> |                     # Skip stuff inside HTML elements
1023                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
1024                             ISBN\s+(\b                  # ISBN, capture number as m[2]
1025                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1026                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1027                                      [0-9Xx]                 # check digit
1028                                    \b)
1029                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1030                 wfProfileOut( __METHOD__ );
1031                 return $text;
1032         }
1033
1034         function magicLinkCallback( $m ) {
1035                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1036                         # Skip HTML element
1037                         return $m[0];
1038                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1039                         $isbn = $m[2];
1040                         $num = strtr( $isbn, array(
1041                                 '-' => '',
1042                                 ' ' => '',
1043                                 'x' => 'X',
1044                         ));
1045                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
1046                         $text = '<a href="' .
1047                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
1048                                 "\" class=\"internal\">ISBN $isbn</a>";
1049                 } else {
1050                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1051                                 $keyword = 'RFC';
1052                                 $urlmsg = 'rfcurl';
1053                                 $id = $m[1];
1054                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1055                                 $keyword = 'PMID';
1056                                 $urlmsg = 'pubmedurl';
1057                                 $id = $m[1];
1058                         } else {
1059                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1060                                         substr($m[0], 0, 20 ) . '"' );
1061                         }
1062
1063                         $url = wfMsg( $urlmsg, $id);
1064                         $sk = $this->mOptions->getSkin();
1065                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1066                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1067                 }
1068                 return $text;
1069         }
1070
1071         /**
1072          * Parse headers and return html
1073          *
1074          * @private
1075          */
1076         function doHeadings( $text ) {
1077                 $fname = 'Parser::doHeadings';
1078                 wfProfileIn( $fname );
1079                 for ( $i = 6; $i >= 1; --$i ) {
1080                         $h = str_repeat( '=', $i );
1081                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
1082                           "<h{$i}>\\1</h{$i}>\\2", $text );
1083                 }
1084                 wfProfileOut( $fname );
1085                 return $text;
1086         }
1087
1088         /**
1089          * Replace single quotes with HTML markup
1090          * @private
1091          * @return string the altered text
1092          */
1093         function doAllQuotes( $text ) {
1094                 $fname = 'Parser::doAllQuotes';
1095                 wfProfileIn( $fname );
1096                 $outtext = '';
1097                 $lines = explode( "\n", $text );
1098                 foreach ( $lines as $line ) {
1099                         $outtext .= $this->doQuotes ( $line ) . "\n";
1100                 }
1101                 $outtext = substr($outtext, 0,-1);
1102                 wfProfileOut( $fname );
1103                 return $outtext;
1104         }
1105
1106         /**
1107          * Helper function for doAllQuotes()
1108          */
1109         public function doQuotes( $text ) {
1110                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1111                 if ( count( $arr ) == 1 )
1112                         return $text;
1113                 else
1114                 {
1115                         # First, do some preliminary work. This may shift some apostrophes from
1116                         # being mark-up to being text. It also counts the number of occurrences
1117                         # of bold and italics mark-ups.
1118                         $i = 0;
1119                         $numbold = 0;
1120                         $numitalics = 0;
1121                         foreach ( $arr as $r )
1122                         {
1123                                 if ( ( $i % 2 ) == 1 )
1124                                 {
1125                                         # If there are ever four apostrophes, assume the first is supposed to
1126                                         # be text, and the remaining three constitute mark-up for bold text.
1127                                         if ( strlen( $arr[$i] ) == 4 )
1128                                         {
1129                                                 $arr[$i-1] .= "'";
1130                                                 $arr[$i] = "'''";
1131                                         }
1132                                         # If there are more than 5 apostrophes in a row, assume they're all
1133                                         # text except for the last 5.
1134                                         else if ( strlen( $arr[$i] ) > 5 )
1135                                         {
1136                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1137                                                 $arr[$i] = "'''''";
1138                                         }
1139                                         # Count the number of occurrences of bold and italics mark-ups.
1140                                         # We are not counting sequences of five apostrophes.
1141                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1142                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1143                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1144                                 }
1145                                 $i++;
1146                         }
1147
1148                         # If there is an odd number of both bold and italics, it is likely
1149                         # that one of the bold ones was meant to be an apostrophe followed
1150                         # by italics. Which one we cannot know for certain, but it is more
1151                         # likely to be one that has a single-letter word before it.
1152                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1153                         {
1154                                 $i = 0;
1155                                 $firstsingleletterword = -1;
1156                                 $firstmultiletterword = -1;
1157                                 $firstspace = -1;
1158                                 foreach ( $arr as $r )
1159                                 {
1160                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1161                                         {
1162                                                 $x1 = substr ($arr[$i-1], -1);
1163                                                 $x2 = substr ($arr[$i-1], -2, 1);
1164                                                 if ($x1 == ' ') {
1165                                                         if ($firstspace == -1) $firstspace = $i;
1166                                                 } else if ($x2 == ' ') {
1167                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1168                                                 } else {
1169                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1170                                                 }
1171                                         }
1172                                         $i++;
1173                                 }
1174
1175                                 # If there is a single-letter word, use it!
1176                                 if ($firstsingleletterword > -1)
1177                                 {
1178                                         $arr [ $firstsingleletterword ] = "''";
1179                                         $arr [ $firstsingleletterword-1 ] .= "'";
1180                                 }
1181                                 # If not, but there's a multi-letter word, use that one.
1182                                 else if ($firstmultiletterword > -1)
1183                                 {
1184                                         $arr [ $firstmultiletterword ] = "''";
1185                                         $arr [ $firstmultiletterword-1 ] .= "'";
1186                                 }
1187                                 # ... otherwise use the first one that has neither.
1188                                 # (notice that it is possible for all three to be -1 if, for example,
1189                                 # there is only one pentuple-apostrophe in the line)
1190                                 else if ($firstspace > -1)
1191                                 {
1192                                         $arr [ $firstspace ] = "''";
1193                                         $arr [ $firstspace-1 ] .= "'";
1194                                 }
1195                         }
1196
1197                         # Now let's actually convert our apostrophic mush to HTML!
1198                         $output = '';
1199                         $buffer = '';
1200                         $state = '';
1201                         $i = 0;
1202                         foreach ($arr as $r)
1203                         {
1204                                 if (($i % 2) == 0)
1205                                 {
1206                                         if ($state == 'both')
1207                                                 $buffer .= $r;
1208                                         else
1209                                                 $output .= $r;
1210                                 }
1211                                 else
1212                                 {
1213                                         if (strlen ($r) == 2)
1214                                         {
1215                                                 if ($state == 'i')
1216                                                 { $output .= '</i>'; $state = ''; }
1217                                                 else if ($state == 'bi')
1218                                                 { $output .= '</i>'; $state = 'b'; }
1219                                                 else if ($state == 'ib')
1220                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1221                                                 else if ($state == 'both')
1222                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1223                                                 else # $state can be 'b' or ''
1224                                                 { $output .= '<i>'; $state .= 'i'; }
1225                                         }
1226                                         else if (strlen ($r) == 3)
1227                                         {
1228                                                 if ($state == 'b')
1229                                                 { $output .= '</b>'; $state = ''; }
1230                                                 else if ($state == 'bi')
1231                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1232                                                 else if ($state == 'ib')
1233                                                 { $output .= '</b>'; $state = 'i'; }
1234                                                 else if ($state == 'both')
1235                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1236                                                 else # $state can be 'i' or ''
1237                                                 { $output .= '<b>'; $state .= 'b'; }
1238                                         }
1239                                         else if (strlen ($r) == 5)
1240                                         {
1241                                                 if ($state == 'b')
1242                                                 { $output .= '</b><i>'; $state = 'i'; }
1243                                                 else if ($state == 'i')
1244                                                 { $output .= '</i><b>'; $state = 'b'; }
1245                                                 else if ($state == 'bi')
1246                                                 { $output .= '</i></b>'; $state = ''; }
1247                                                 else if ($state == 'ib')
1248                                                 { $output .= '</b></i>'; $state = ''; }
1249                                                 else if ($state == 'both')
1250                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1251                                                 else # ($state == '')
1252                                                 { $buffer = ''; $state = 'both'; }
1253                                         }
1254                                 }
1255                                 $i++;
1256                         }
1257                         # Now close all remaining tags.  Notice that the order is important.
1258                         if ($state == 'b' || $state == 'ib')
1259                                 $output .= '</b>';
1260                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1261                                 $output .= '</i>';
1262                         if ($state == 'bi')
1263                                 $output .= '</b>';
1264                         # There might be lonely ''''', so make sure we have a buffer
1265                         if ($state == 'both' && $buffer)
1266                                 $output .= '<b><i>'.$buffer.'</i></b>';
1267                         return $output;
1268                 }
1269         }
1270
1271         /**
1272          * Replace external links
1273          *
1274          * Note: this is all very hackish and the order of execution matters a lot.
1275          * Make sure to run maintenance/parserTests.php if you change this code.
1276          *
1277          * @private
1278          */
1279         function replaceExternalLinks( $text ) {
1280                 global $wgContLang;
1281                 $fname = 'Parser::replaceExternalLinks';
1282                 wfProfileIn( $fname );
1283
1284                 $sk = $this->mOptions->getSkin();
1285
1286                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1287
1288                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1289
1290                 $i = 0;
1291                 while ( $i<count( $bits ) ) {
1292                         $url = $bits[$i++];
1293                         $protocol = $bits[$i++];
1294                         $text = $bits[$i++];
1295                         $trail = $bits[$i++];
1296
1297                         # The characters '<' and '>' (which were escaped by
1298                         # removeHTMLtags()) should not be included in
1299                         # URLs, per RFC 2396.
1300                         $m2 = array();
1301                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1302                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1303                                 $url = substr($url, 0, $m2[0][1]);
1304                         }
1305
1306                         # If the link text is an image URL, replace it with an <img> tag
1307                         # This happened by accident in the original parser, but some people used it extensively
1308                         $img = $this->maybeMakeExternalImage( $text );
1309                         if ( $img !== false ) {
1310                                 $text = $img;
1311                         }
1312
1313                         $dtrail = '';
1314
1315                         # Set linktype for CSS - if URL==text, link is essentially free
1316                         $linktype = ($text == $url) ? 'free' : 'text';
1317
1318                         # No link text, e.g. [http://domain.tld/some.link]
1319                         if ( $text == '' ) {
1320                                 # Autonumber if allowed. See bug #5918
1321                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1322                                         $text = '[' . ++$this->mAutonumber . ']';
1323                                         $linktype = 'autonumber';
1324                                 } else {
1325                                         # Otherwise just use the URL
1326                                         $text = htmlspecialchars( $url );
1327                                         $linktype = 'free';
1328                                 }
1329                         } else {
1330                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1331                                 # Check for trail
1332                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1333                         }
1334
1335                         $text = $wgContLang->markNoConversion($text);
1336
1337                         $url = Sanitizer::cleanUrl( $url );
1338
1339                         # Process the trail (i.e. everything after this link up until start of the next link),
1340                         # replacing any non-bracketed links
1341                         $trail = $this->replaceFreeExternalLinks( $trail );
1342
1343                         # Use the encoded URL
1344                         # This means that users can paste URLs directly into the text
1345                         # Funny characters like &ouml; aren't valid in URLs anyway
1346                         # This was changed in August 2004
1347                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1348
1349                         # Register link in the output object.
1350                         # Replace unnecessary URL escape codes with the referenced character
1351                         # This prevents spammers from hiding links from the filters
1352                         $pasteurized = self::replaceUnusualEscapes( $url );
1353                         $this->mOutput->addExternalLink( $pasteurized );
1354                 }
1355
1356                 wfProfileOut( $fname );
1357                 return $s;
1358         }
1359
1360         /**
1361          * Replace anything that looks like a URL with a link
1362          * @private
1363          */
1364         function replaceFreeExternalLinks( $text ) {
1365                 global $wgContLang;
1366                 $fname = 'Parser::replaceFreeExternalLinks';
1367                 wfProfileIn( $fname );
1368
1369                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1370                 $s = array_shift( $bits );
1371                 $i = 0;
1372
1373                 $sk = $this->mOptions->getSkin();
1374
1375                 while ( $i < count( $bits ) ){
1376                         $protocol = $bits[$i++];
1377                         $remainder = $bits[$i++];
1378
1379                         $m = array();
1380                         if ( preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1381                                 # Found some characters after the protocol that look promising
1382                                 $url = $protocol . $m[1];
1383                                 $trail = $m[2];
1384
1385                                 # special case: handle urls as url args:
1386                                 # http://www.example.com/foo?=http://www.example.com/bar
1387                                 if(strlen($trail) == 0 &&
1388                                         isset($bits[$i]) &&
1389                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1390                                         preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1391                                 {
1392                                         # add protocol, arg
1393                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1394                                         $i += 2;
1395                                         $trail = $m[2];
1396                                 }
1397
1398                                 # The characters '<' and '>' (which were escaped by
1399                                 # removeHTMLtags()) should not be included in
1400                                 # URLs, per RFC 2396.
1401                                 $m2 = array();
1402                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1403                                         $trail = substr($url, $m2[0][1]) . $trail;
1404                                         $url = substr($url, 0, $m2[0][1]);
1405                                 }
1406
1407                                 # Move trailing punctuation to $trail
1408                                 $sep = ',;\.:!?';
1409                                 # If there is no left bracket, then consider right brackets fair game too
1410                                 if ( strpos( $url, '(' ) === false ) {
1411                                         $sep .= ')';
1412                                 }
1413
1414                                 $numSepChars = strspn( strrev( $url ), $sep );
1415                                 if ( $numSepChars ) {
1416                                         $trail = substr( $url, -$numSepChars ) . $trail;
1417                                         $url = substr( $url, 0, -$numSepChars );
1418                                 }
1419
1420                                 $url = Sanitizer::cleanUrl( $url );
1421
1422                                 # Is this an external image?
1423                                 $text = $this->maybeMakeExternalImage( $url );
1424                                 if ( $text === false ) {
1425                                         # Not an image, make a link
1426                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1427                                         # Register it in the output object...
1428                                         # Replace unnecessary URL escape codes with their equivalent characters
1429                                         $pasteurized = self::replaceUnusualEscapes( $url );
1430                                         $this->mOutput->addExternalLink( $pasteurized );
1431                                 }
1432                                 $s .= $text . $trail;
1433                         } else {
1434                                 $s .= $protocol . $remainder;
1435                         }
1436                 }
1437                 wfProfileOut( $fname );
1438                 return $s;
1439         }
1440
1441         /**
1442          * Replace unusual URL escape codes with their equivalent characters
1443          * @param string
1444          * @return string
1445          * @static
1446          * @todo  This can merge genuinely required bits in the path or query string,
1447          *        breaking legit URLs. A proper fix would treat the various parts of
1448          *        the URL differently; as a workaround, just use the output for
1449          *        statistical records, not for actual linking/output.
1450          */
1451         static function replaceUnusualEscapes( $url ) {
1452                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1453                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1454         }
1455
1456         /**
1457          * Callback function used in replaceUnusualEscapes().
1458          * Replaces unusual URL escape codes with their equivalent character
1459          * @static
1460          * @private
1461          */
1462         private static function replaceUnusualEscapesCallback( $matches ) {
1463                 $char = urldecode( $matches[0] );
1464                 $ord = ord( $char );
1465                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1466                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1467                         // No, shouldn't be escaped
1468                         return $char;
1469                 } else {
1470                         // Yes, leave it escaped
1471                         return $matches[0];
1472                 }
1473         }
1474
1475         /**
1476          * make an image if it's allowed, either through the global
1477          * option or through the exception
1478          * @private
1479          */
1480         function maybeMakeExternalImage( $url ) {
1481                 $sk = $this->mOptions->getSkin();
1482                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1483                 $imagesexception = !empty($imagesfrom);
1484                 $text = false;
1485                 if ( $this->mOptions->getAllowExternalImages()
1486                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1487                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1488                                 # Image found
1489                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1490                         }
1491                 }
1492                 return $text;
1493         }
1494
1495         /**
1496          * Process [[ ]] wikilinks
1497          *
1498          * @private
1499          */
1500         function replaceInternalLinks( $s ) {
1501                 global $wgContLang;
1502                 static $fname = 'Parser::replaceInternalLinks' ;
1503
1504                 wfProfileIn( $fname );
1505
1506                 wfProfileIn( $fname.'-setup' );
1507                 static $tc = FALSE;
1508                 # the % is needed to support urlencoded titles as well
1509                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1510
1511                 $sk = $this->mOptions->getSkin();
1512
1513                 #split the entire text string on occurences of [[
1514                 $a = explode( '[[', ' ' . $s );
1515                 #get the first element (all text up to first [[), and remove the space we added
1516                 $s = array_shift( $a );
1517                 $s = substr( $s, 1 );
1518
1519                 # Match a link having the form [[namespace:link|alternate]]trail
1520                 static $e1 = FALSE;
1521                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1522                 # Match cases where there is no "]]", which might still be images
1523                 static $e1_img = FALSE;
1524                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1525                 # Match the end of a line for a word that's not followed by whitespace,
1526                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1527                 $e2 = wfMsgForContent( 'linkprefix' );
1528
1529                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1530                 if( is_null( $this->mTitle ) ) {
1531                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1532                 }
1533                 $nottalk = !$this->mTitle->isTalkPage();
1534
1535                 if ( $useLinkPrefixExtension ) {
1536                         $m = array();
1537                         if ( preg_match( $e2, $s, $m ) ) {
1538                                 $first_prefix = $m[2];
1539                         } else {
1540                                 $first_prefix = false;
1541                         }
1542                 } else {
1543                         $prefix = '';
1544                 }
1545
1546                 if($wgContLang->hasVariants()) {
1547                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1548                 } else {
1549                         $selflink = array($this->mTitle->getPrefixedText());
1550                 }
1551                 $useSubpages = $this->areSubpagesAllowed();
1552                 wfProfileOut( $fname.'-setup' );
1553
1554                 # Loop for each link
1555                 for ($k = 0; isset( $a[$k] ); $k++) {
1556                         $line = $a[$k];
1557                         if ( $useLinkPrefixExtension ) {
1558                                 wfProfileIn( $fname.'-prefixhandling' );
1559                                 if ( preg_match( $e2, $s, $m ) ) {
1560                                         $prefix = $m[2];
1561                                         $s = $m[1];
1562                                 } else {
1563                                         $prefix='';
1564                                 }
1565                                 # first link
1566                                 if($first_prefix) {
1567                                         $prefix = $first_prefix;
1568                                         $first_prefix = false;
1569                                 }
1570                                 wfProfileOut( $fname.'-prefixhandling' );
1571                         }
1572
1573                         $might_be_img = false;
1574
1575                         wfProfileIn( "$fname-e1" );
1576                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1577                                 $text = $m[2];
1578                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1579                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1580                                 # the real problem is with the $e1 regex
1581                                 # See bug 1300.
1582                                 #
1583                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1584                                 # and no image is in sight. See bug 2095.
1585                                 #
1586                                 if( $text !== '' &&
1587                                         substr( $m[3], 0, 1 ) === ']' &&
1588                                         strpos($text, '[') !== false
1589                                 )
1590                                 {
1591                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1592                                         $m[3] = substr( $m[3], 1 );
1593                                 }
1594                                 # fix up urlencoded title texts
1595                                 if( strpos( $m[1], '%' ) !== false ) {
1596                                         # Should anchors '#' also be rejected?
1597                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1598                                 }
1599                                 $trail = $m[3];
1600                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1601                                 $might_be_img = true;
1602                                 $text = $m[2];
1603                                 if ( strpos( $m[1], '%' ) !== false ) {
1604                                         $m[1] = urldecode($m[1]);
1605                                 }
1606                                 $trail = "";
1607                         } else { # Invalid form; output directly
1608                                 $s .= $prefix . '[[' . $line ;
1609                                 wfProfileOut( "$fname-e1" );
1610                                 continue;
1611                         }
1612                         wfProfileOut( "$fname-e1" );
1613                         wfProfileIn( "$fname-misc" );
1614
1615                         # Don't allow internal links to pages containing
1616                         # PROTO: where PROTO is a valid URL protocol; these
1617                         # should be external links.
1618                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1619                                 $s .= $prefix . '[[' . $line ;
1620                                 continue;
1621                         }
1622
1623                         # Make subpage if necessary
1624                         if( $useSubpages ) {
1625                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1626                         } else {
1627                                 $link = $m[1];
1628                         }
1629
1630                         $noforce = (substr($m[1], 0, 1) != ':');
1631                         if (!$noforce) {
1632                                 # Strip off leading ':'
1633                                 $link = substr($link, 1);
1634                         }
1635
1636                         wfProfileOut( "$fname-misc" );
1637                         wfProfileIn( "$fname-title" );
1638                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1639                         if( !$nt ) {
1640                                 $s .= $prefix . '[[' . $line;
1641                                 wfProfileOut( "$fname-title" );
1642                                 continue;
1643                         }
1644
1645                         $ns = $nt->getNamespace();
1646                         $iw = $nt->getInterWiki();
1647                         wfProfileOut( "$fname-title" );
1648
1649                         if ($might_be_img) { # if this is actually an invalid link
1650                                 wfProfileIn( "$fname-might_be_img" );
1651                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1652                                         $found = false;
1653                                         while (isset ($a[$k+1]) ) {
1654                                                 #look at the next 'line' to see if we can close it there
1655                                                 $spliced = array_splice( $a, $k + 1, 1 );
1656                                                 $next_line = array_shift( $spliced );
1657                                                 $m = explode( ']]', $next_line, 3 );
1658                                                 if ( count( $m ) == 3 ) {
1659                                                         # the first ]] closes the inner link, the second the image
1660                                                         $found = true;
1661                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1662                                                         $trail = $m[2];
1663                                                         break;
1664                                                 } elseif ( count( $m ) == 2 ) {
1665                                                         #if there's exactly one ]] that's fine, we'll keep looking
1666                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1667                                                 } else {
1668                                                         #if $next_line is invalid too, we need look no further
1669                                                         $text .= '[[' . $next_line;
1670                                                         break;
1671                                                 }
1672                                         }
1673                                         if ( !$found ) {
1674                                                 # we couldn't find the end of this imageLink, so output it raw
1675                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1676                                                 $text = $this->replaceInternalLinks($text);
1677                                                 $s .= "{$prefix}[[$link|$text";
1678                                                 # note: no $trail, because without an end, there *is* no trail
1679                                                 wfProfileOut( "$fname-might_be_img" );
1680                                                 continue;
1681                                         }
1682                                 } else { #it's not an image, so output it raw
1683                                         $s .= "{$prefix}[[$link|$text";
1684                                         # note: no $trail, because without an end, there *is* no trail
1685                                         wfProfileOut( "$fname-might_be_img" );
1686                                         continue;
1687                                 }
1688                                 wfProfileOut( "$fname-might_be_img" );
1689                         }
1690
1691                         $wasblank = ( '' == $text );
1692                         if( $wasblank ) $text = $link;
1693
1694                         # Link not escaped by : , create the various objects
1695                         if( $noforce ) {
1696
1697                                 # Interwikis
1698                                 wfProfileIn( "$fname-interwiki" );
1699                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1700                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1701                                         $s = rtrim($s . $prefix);
1702                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1703                                         wfProfileOut( "$fname-interwiki" );
1704                                         continue;
1705                                 }
1706                                 wfProfileOut( "$fname-interwiki" );
1707
1708                                 if ( $ns == NS_IMAGE ) {
1709                                         wfProfileIn( "$fname-image" );
1710                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1711                                                 # recursively parse links inside the image caption
1712                                                 # actually, this will parse them in any other parameters, too,
1713                                                 # but it might be hard to fix that, and it doesn't matter ATM
1714                                                 $text = $this->replaceExternalLinks($text);
1715                                                 $text = $this->replaceInternalLinks($text);
1716
1717                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1718                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1719                                                 $this->mOutput->addImage( $nt->getDBkey() );
1720
1721                                                 wfProfileOut( "$fname-image" );
1722                                                 continue;
1723                                         } else {
1724                                                 # We still need to record the image's presence on the page
1725                                                 $this->mOutput->addImage( $nt->getDBkey() );
1726                                         }
1727                                         wfProfileOut( "$fname-image" );
1728
1729                                 }
1730
1731                                 if ( $ns == NS_CATEGORY ) {
1732                                         wfProfileIn( "$fname-category" );
1733                                         $s = rtrim($s . "\n"); # bug 87
1734
1735                                         if ( $wasblank ) {
1736                                                 $sortkey = $this->getDefaultSort();
1737                                         } else {
1738                                                 $sortkey = $text;
1739                                         }
1740                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1741                                         $sortkey = str_replace( "\n", '', $sortkey );
1742                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1743                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1744
1745                                         /**
1746                                          * Strip the whitespace Category links produce, see bug 87
1747                                          * @todo We might want to use trim($tmp, "\n") here.
1748                                          */
1749                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1750
1751                                         wfProfileOut( "$fname-category" );
1752                                         continue;
1753                                 }
1754                         }
1755
1756                         # Self-link checking
1757                         if( $nt->getFragment() === '' ) {
1758                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1759                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1760                                         continue;
1761                                 }
1762                         }
1763
1764                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1765                         if( $ns == NS_MEDIA ) {
1766                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1767                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1768                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1769                                 $this->mOutput->addImage( $nt->getDBkey() );
1770                                 continue;
1771                         } elseif( $ns == NS_SPECIAL ) {
1772                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1773                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1774                                 } else {
1775                                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1776                                 }
1777                                 continue;
1778                         } elseif( $ns == NS_IMAGE ) {
1779                                 $img = wfFindFile( $nt );
1780                                 if( $img ) {
1781                                         // Force a blue link if the file exists; may be a remote
1782                                         // upload on the shared repository, and we want to see its
1783                                         // auto-generated page.
1784                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1785                                         $this->mOutput->addLink( $nt );
1786                                         continue;
1787                                 }
1788                         }
1789                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1790                 }
1791                 wfProfileOut( $fname );
1792                 return $s;
1793         }
1794
1795         /**
1796          * Make a link placeholder. The text returned can be later resolved to a real link with
1797          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1798          * parsing of interwiki links, and secondly to allow all existence checks and
1799          * article length checks (for stub links) to be bundled into a single query.
1800          *
1801          */
1802         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1803                 wfProfileIn( __METHOD__ );
1804                 if ( ! is_object($nt) ) {
1805                         # Fail gracefully
1806                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1807                 } else {
1808                         # Separate the link trail from the rest of the link
1809                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1810
1811                         if ( $nt->isExternal() ) {
1812                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1813                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1814                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1815                         } else {
1816                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1817                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1818                                 $this->mLinkHolders['queries'][] = $query;
1819                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1820                                 $this->mLinkHolders['titles'][] = $nt;
1821
1822                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1823                         }
1824                 }
1825                 wfProfileOut( __METHOD__ );
1826                 return $retVal;
1827         }
1828
1829         /**
1830          * Render a forced-blue link inline; protect against double expansion of
1831          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1832          * Since this little disaster has to split off the trail text to avoid
1833          * breaking URLs in the following text without breaking trails on the
1834          * wiki links, it's been made into a horrible function.
1835          *
1836          * @param Title $nt
1837          * @param string $text
1838          * @param string $query
1839          * @param string $trail
1840          * @param string $prefix
1841          * @return string HTML-wikitext mix oh yuck
1842          */
1843         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1844                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1845                 $sk = $this->mOptions->getSkin();
1846                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1847                 return $this->armorLinks( $link ) . $trail;
1848         }
1849
1850         /**
1851          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1852          * going to go through further parsing steps before inline URL expansion.
1853          *
1854          * In particular this is important when using action=render, which causes
1855          * full URLs to be included.
1856          *
1857          * Oh man I hate our multi-layer parser!
1858          *
1859          * @param string more-or-less HTML
1860          * @return string less-or-more HTML with NOPARSE bits
1861          */
1862         function armorLinks( $text ) {
1863                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1864                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1865         }
1866
1867         /**
1868          * Return true if subpage links should be expanded on this page.
1869          * @return bool
1870          */
1871         function areSubpagesAllowed() {
1872                 # Some namespaces don't allow subpages
1873                 global $wgNamespacesWithSubpages;
1874                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1875         }
1876
1877         /**
1878          * Handle link to subpage if necessary
1879          * @param string $target the source of the link
1880          * @param string &$text the link text, modified as necessary
1881          * @return string the full name of the link
1882          * @private
1883          */
1884         function maybeDoSubpageLink($target, &$text) {
1885                 # Valid link forms:
1886                 # Foobar -- normal
1887                 # :Foobar -- override special treatment of prefix (images, language links)
1888                 # /Foobar -- convert to CurrentPage/Foobar
1889                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1890                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1891                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1892
1893                 $fname = 'Parser::maybeDoSubpageLink';
1894                 wfProfileIn( $fname );
1895                 $ret = $target; # default return value is no change
1896
1897                 # Some namespaces don't allow subpages,
1898                 # so only perform processing if subpages are allowed
1899                 if( $this->areSubpagesAllowed() ) {
1900                         $hash = strpos( $target, '#' );
1901                         if( $hash !== false ) {
1902                                 $suffix = substr( $target, $hash );
1903                                 $target = substr( $target, 0, $hash );
1904                         } else {
1905                                 $suffix = '';
1906                         }
1907                         # bug 7425
1908                         $target = trim( $target );
1909                         # Look at the first character
1910                         if( $target != '' && $target{0} == '/' ) {
1911                                 # / at end means we don't want the slash to be shown
1912                                 $m = array();
1913                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1914                                 if( $trailingSlashes ) {
1915                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1916                                 } else {
1917                                         $noslash = substr( $target, 1 );
1918                                 }
1919
1920                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1921                                 if( '' === $text ) {
1922                                         $text = $target . $suffix;
1923                                 } # this might be changed for ugliness reasons
1924                         } else {
1925                                 # check for .. subpage backlinks
1926                                 $dotdotcount = 0;
1927                                 $nodotdot = $target;
1928                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1929                                         ++$dotdotcount;
1930                                         $nodotdot = substr( $nodotdot, 3 );
1931                                 }
1932                                 if($dotdotcount > 0) {
1933                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1934                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1935                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1936                                                 # / at the end means don't show full path
1937                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1938                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1939                                                         if( '' === $text ) {
1940                                                                 $text = $nodotdot . $suffix;
1941                                                         }
1942                                                 }
1943                                                 $nodotdot = trim( $nodotdot );
1944                                                 if( $nodotdot != '' ) {
1945                                                         $ret .= '/' . $nodotdot;
1946                                                 }
1947                                                 $ret .= $suffix;
1948                                         }
1949                                 }
1950                         }
1951                 }
1952
1953                 wfProfileOut( $fname );
1954                 return $ret;
1955         }
1956
1957         /**#@+
1958          * Used by doBlockLevels()
1959          * @private
1960          */
1961         /* private */ function closeParagraph() {
1962                 $result = '';
1963                 if ( '' != $this->mLastSection ) {
1964                         $result = '</' . $this->mLastSection  . ">\n";
1965                 }
1966                 $this->mInPre = false;
1967                 $this->mLastSection = '';
1968                 return $result;
1969         }
1970         # getCommon() returns the length of the longest common substring
1971         # of both arguments, starting at the beginning of both.
1972         #
1973         /* private */ function getCommon( $st1, $st2 ) {
1974                 $fl = strlen( $st1 );
1975                 $shorter = strlen( $st2 );
1976                 if ( $fl < $shorter ) { $shorter = $fl; }
1977
1978                 for ( $i = 0; $i < $shorter; ++$i ) {
1979                         if ( $st1{$i} != $st2{$i} ) { break; }
1980                 }
1981                 return $i;
1982         }
1983         # These next three functions open, continue, and close the list
1984         # element appropriate to the prefix character passed into them.
1985         #
1986         /* private */ function openList( $char ) {
1987                 $result = $this->closeParagraph();
1988
1989                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1990                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1991                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1992                 else if ( ';' == $char ) {
1993                         $result .= '<dl><dt>';
1994                         $this->mDTopen = true;
1995                 }
1996                 else { $result = '<!-- ERR 1 -->'; }
1997
1998                 return $result;
1999         }
2000
2001         /* private */ function nextItem( $char ) {
2002                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
2003                 else if ( ':' == $char || ';' == $char ) {
2004                         $close = '</dd>';
2005                         if ( $this->mDTopen ) { $close = '</dt>'; }
2006                         if ( ';' == $char ) {
2007                                 $this->mDTopen = true;
2008                                 return $close . '<dt>';
2009                         } else {
2010                                 $this->mDTopen = false;
2011                                 return $close . '<dd>';
2012                         }
2013                 }
2014                 return '<!-- ERR 2 -->';
2015         }
2016
2017         /* private */ function closeList( $char ) {
2018                 if ( '*' == $char ) { $text = '</li></ul>'; }
2019                 else if ( '#' == $char ) { $text = '</li></ol>'; }
2020                 else if ( ':' == $char ) {
2021                         if ( $this->mDTopen ) {
2022                                 $this->mDTopen = false;
2023                                 $text = '</dt></dl>';
2024                         } else {
2025                                 $text = '</dd></dl>';
2026                         }
2027                 }
2028                 else {  return '<!-- ERR 3 -->'; }
2029                 return $text."\n";
2030         }
2031         /**#@-*/
2032
2033         /**
2034          * Make lists from lines starting with ':', '*', '#', etc.
2035          *
2036          * @private
2037          * @return string the lists rendered as HTML
2038          */
2039         function doBlockLevels( $text, $linestart ) {
2040                 $fname = 'Parser::doBlockLevels';
2041                 wfProfileIn( $fname );
2042
2043                 # Parsing through the text line by line.  The main thing
2044                 # happening here is handling of block-level elements p, pre,
2045                 # and making lists from lines starting with * # : etc.
2046                 #
2047                 $textLines = explode( "\n", $text );
2048
2049                 $lastPrefix = $output = '';
2050                 $this->mDTopen = $inBlockElem = false;
2051                 $prefixLength = 0;
2052                 $paragraphStack = false;
2053
2054                 if ( !$linestart ) {
2055                         $output .= array_shift( $textLines );
2056                 }
2057                 foreach ( $textLines as $oLine ) {
2058                         $lastPrefixLength = strlen( $lastPrefix );
2059                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2060                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2061                         if ( !$this->mInPre ) {
2062                                 # Multiple prefixes may abut each other for nested lists.
2063                                 $prefixLength = strspn( $oLine, '*#:;' );
2064                                 $pref = substr( $oLine, 0, $prefixLength );
2065
2066                                 # eh?
2067                                 $pref2 = str_replace( ';', ':', $pref );
2068                                 $t = substr( $oLine, $prefixLength );
2069                                 $this->mInPre = !empty($preOpenMatch);
2070                         } else {
2071                                 # Don't interpret any other prefixes in preformatted text
2072                                 $prefixLength = 0;
2073                                 $pref = $pref2 = '';
2074                                 $t = $oLine;
2075                         }
2076
2077                         # List generation
2078                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2079                                 # Same as the last item, so no need to deal with nesting or opening stuff
2080                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2081                                 $paragraphStack = false;
2082
2083                                 if ( substr( $pref, -1 ) == ';') {
2084                                         # The one nasty exception: definition lists work like this:
2085                                         # ; title : definition text
2086                                         # So we check for : in the remainder text to split up the
2087                                         # title and definition, without b0rking links.
2088                                         $term = $t2 = '';
2089                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2090                                                 $t = $t2;
2091                                                 $output .= $term . $this->nextItem( ':' );
2092                                         }
2093                                 }
2094                         } elseif( $prefixLength || $lastPrefixLength ) {
2095                                 # Either open or close a level...
2096                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2097                                 $paragraphStack = false;
2098
2099                                 while( $commonPrefixLength < $lastPrefixLength ) {
2100                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2101                                         --$lastPrefixLength;
2102                                 }
2103                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2104                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2105                                 }
2106                                 while ( $prefixLength > $commonPrefixLength ) {
2107                                         $char = substr( $pref, $commonPrefixLength, 1 );
2108                                         $output .= $this->openList( $char );
2109
2110                                         if ( ';' == $char ) {
2111                                                 # FIXME: This is dupe of code above
2112                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2113                                                         $t = $t2;
2114                                                         $output .= $term . $this->nextItem( ':' );
2115                                                 }
2116                                         }
2117                                         ++$commonPrefixLength;
2118                                 }
2119                                 $lastPrefix = $pref2;
2120                         }
2121                         if( 0 == $prefixLength ) {
2122                                 wfProfileIn( "$fname-paragraph" );
2123                                 # No prefix (not in list)--go to paragraph mode
2124                                 // XXX: use a stack for nestable elements like span, table and div
2125                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2126                                 $closematch = preg_match(
2127                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2128                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2129                                 if ( $openmatch or $closematch ) {
2130                                         $paragraphStack = false;
2131                                         # TODO bug 5718: paragraph closed
2132                                         $output .= $this->closeParagraph();
2133                                         if ( $preOpenMatch and !$preCloseMatch ) {
2134                                                 $this->mInPre = true;
2135                                         }
2136                                         if ( $closematch ) {
2137                                                 $inBlockElem = false;
2138                                         } else {
2139                                                 $inBlockElem = true;
2140                                         }
2141                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2142                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2143                                                 // pre
2144                                                 if ($this->mLastSection != 'pre') {
2145                                                         $paragraphStack = false;
2146                                                         $output .= $this->closeParagraph().'<pre>';
2147                                                         $this->mLastSection = 'pre';
2148                                                 }
2149                                                 $t = substr( $t, 1 );
2150                                         } else {
2151                                                 // paragraph
2152                                                 if ( '' == trim($t) ) {
2153                                                         if ( $paragraphStack ) {
2154                                                                 $output .= $paragraphStack.'<br />';
2155                                                                 $paragraphStack = false;
2156                                                                 $this->mLastSection = 'p';
2157                                                         } else {
2158                                                                 if ($this->mLastSection != 'p' ) {
2159                                                                         $output .= $this->closeParagraph();
2160                                                                         $this->mLastSection = '';
2161                                                                         $paragraphStack = '<p>';
2162                                                                 } else {
2163                                                                         $paragraphStack = '</p><p>';
2164                                                                 }
2165                                                         }
2166                                                 } else {
2167                                                         if ( $paragraphStack ) {
2168                                                                 $output .= $paragraphStack;
2169                                                                 $paragraphStack = false;
2170                                                                 $this->mLastSection = 'p';
2171                                                         } else if ($this->mLastSection != 'p') {
2172                                                                 $output .= $this->closeParagraph().'<p>';
2173                                                                 $this->mLastSection = 'p';
2174                                                         }
2175                                                 }
2176                                         }
2177                                 }
2178                                 wfProfileOut( "$fname-paragraph" );
2179                         }
2180                         // somewhere above we forget to get out of pre block (bug 785)
2181                         if($preCloseMatch && $this->mInPre) {
2182                                 $this->mInPre = false;
2183                         }
2184                         if ($paragraphStack === false) {
2185                                 $output .= $t."\n";
2186                         }
2187                 }
2188                 while ( $prefixLength ) {
2189                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2190                         --$prefixLength;
2191                 }
2192                 if ( '' != $this->mLastSection ) {
2193                         $output .= '</' . $this->mLastSection . '>';
2194                         $this->mLastSection = '';
2195                 }
2196
2197                 wfProfileOut( $fname );
2198                 return $output;
2199         }
2200
2201         /**
2202          * Split up a string on ':', ignoring any occurences inside tags
2203          * to prevent illegal overlapping.
2204          * @param string $str the string to split
2205          * @param string &$before set to everything before the ':'
2206          * @param string &$after set to everything after the ':'
2207          * return string the position of the ':', or false if none found
2208          */
2209         function findColonNoLinks($str, &$before, &$after) {
2210                 $fname = 'Parser::findColonNoLinks';
2211                 wfProfileIn( $fname );
2212
2213                 $pos = strpos( $str, ':' );
2214                 if( $pos === false ) {
2215                         // Nothing to find!
2216                         wfProfileOut( $fname );
2217                         return false;
2218                 }
2219
2220                 $lt = strpos( $str, '<' );
2221                 if( $lt === false || $lt > $pos ) {
2222                         // Easy; no tag nesting to worry about
2223                         $before = substr( $str, 0, $pos );
2224                         $after = substr( $str, $pos+1 );
2225                         wfProfileOut( $fname );
2226                         return $pos;
2227                 }
2228
2229                 // Ugly state machine to walk through avoiding tags.
2230                 $state = self::COLON_STATE_TEXT;
2231                 $stack = 0;
2232                 $len = strlen( $str );
2233                 for( $i = 0; $i < $len; $i++ ) {
2234                         $c = $str{$i};
2235
2236                         switch( $state ) {
2237                         // (Using the number is a performance hack for common cases)
2238                         case 0: // self::COLON_STATE_TEXT:
2239                                 switch( $c ) {
2240                                 case "<":
2241                                         // Could be either a <start> tag or an </end> tag
2242                                         $state = self::COLON_STATE_TAGSTART;
2243                                         break;
2244                                 case ":":
2245                                         if( $stack == 0 ) {
2246                                                 // We found it!
2247                                                 $before = substr( $str, 0, $i );
2248                                                 $after = substr( $str, $i + 1 );
2249                                                 wfProfileOut( $fname );
2250                                                 return $i;
2251                                         }
2252                                         // Embedded in a tag; don't break it.
2253                                         break;
2254                                 default:
2255                                         // Skip ahead looking for something interesting
2256                                         $colon = strpos( $str, ':', $i );
2257                                         if( $colon === false ) {
2258                                                 // Nothing else interesting
2259                                                 wfProfileOut( $fname );
2260                                                 return false;
2261                                         }
2262                                         $lt = strpos( $str, '<', $i );
2263                                         if( $stack === 0 ) {
2264                                                 if( $lt === false || $colon < $lt ) {
2265                                                         // We found it!
2266                                                         $before = substr( $str, 0, $colon );
2267                                                         $after = substr( $str, $colon + 1 );
2268                                                         wfProfileOut( $fname );
2269                                                         return $i;
2270                                                 }
2271                                         }
2272                                         if( $lt === false ) {
2273                                                 // Nothing else interesting to find; abort!
2274                                                 // We're nested, but there's no close tags left. Abort!
2275                                                 break 2;
2276                                         }
2277                                         // Skip ahead to next tag start
2278                                         $i = $lt;
2279                                         $state = self::COLON_STATE_TAGSTART;
2280                                 }
2281                                 break;
2282                         case 1: // self::COLON_STATE_TAG:
2283                                 // In a <tag>
2284                                 switch( $c ) {
2285                                 case ">":
2286                                         $stack++;
2287                                         $state = self::COLON_STATE_TEXT;
2288                                         break;
2289                                 case "/":
2290                                         // Slash may be followed by >?
2291                                         $state = self::COLON_STATE_TAGSLASH;
2292                                         break;
2293                                 default:
2294                                         // ignore
2295                                 }
2296                                 break;
2297                         case 2: // self::COLON_STATE_TAGSTART:
2298                                 switch( $c ) {
2299                                 case "/":
2300                                         $state = self::COLON_STATE_CLOSETAG;
2301                                         break;
2302                                 case "!":
2303                                         $state = self::COLON_STATE_COMMENT;
2304                                         break;
2305                                 case ">":
2306                                         // Illegal early close? This shouldn't happen D:
2307                                         $state = self::COLON_STATE_TEXT;
2308                                         break;
2309                                 default:
2310                                         $state = self::COLON_STATE_TAG;
2311                                 }
2312                                 break;
2313                         case 3: // self::COLON_STATE_CLOSETAG:
2314                                 // In a </tag>
2315                                 if( $c == ">" ) {
2316                                         $stack--;
2317                                         if( $stack < 0 ) {
2318                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2319                                                 wfProfileOut( $fname );
2320                                                 return false;
2321                                         }
2322                                         $state = self::COLON_STATE_TEXT;
2323                                 }
2324                                 break;
2325                         case self::COLON_STATE_TAGSLASH:
2326                                 if( $c == ">" ) {
2327                                         // Yes, a self-closed tag <blah/>
2328                                         $state = self::COLON_STATE_TEXT;
2329                                 } else {
2330                                         // Probably we're jumping the gun, and this is an attribute
2331                                         $state = self::COLON_STATE_TAG;
2332                                 }
2333                                 break;
2334                         case 5: // self::COLON_STATE_COMMENT:
2335                                 if( $c == "-" ) {
2336                                         $state = self::COLON_STATE_COMMENTDASH;
2337                                 }
2338                                 break;
2339                         case self::COLON_STATE_COMMENTDASH:
2340                                 if( $c == "-" ) {
2341                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2342                                 } else {
2343                                         $state = self::COLON_STATE_COMMENT;
2344                                 }
2345                                 break;
2346                         case self::COLON_STATE_COMMENTDASHDASH:
2347                                 if( $c == ">" ) {
2348                                         $state = self::COLON_STATE_TEXT;
2349                                 } else {
2350                                         $state = self::COLON_STATE_COMMENT;
2351                                 }
2352                                 break;
2353                         default:
2354                                 throw new MWException( "State machine error in $fname" );
2355                         }
2356                 }
2357                 if( $stack > 0 ) {
2358                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2359                         return false;
2360                 }
2361                 wfProfileOut( $fname );
2362                 return false;
2363         }
2364
2365         /**
2366          * Return value of a magic variable (like PAGENAME)
2367          *
2368          * @private
2369          */
2370         function getVariableValue( $index ) {
2371                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2372
2373                 /**
2374                  * Some of these require message or data lookups and can be
2375                  * expensive to check many times.
2376                  */
2377                 static $varCache = array();
2378                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2379                         if ( isset( $varCache[$index] ) ) {
2380                                 return $varCache[$index];
2381                         }
2382                 }
2383
2384                 $ts = time();
2385                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2386
2387                 # Use the time zone
2388                 global $wgLocaltimezone;
2389                 if ( isset( $wgLocaltimezone ) ) {
2390                         $oldtz = getenv( 'TZ' );
2391                         putenv( 'TZ='.$wgLocaltimezone );
2392                 }
2393
2394                 wfSuppressWarnings(); // E_STRICT system time bitching
2395                 $localTimestamp = date( 'YmdHis', $ts );
2396                 $localMonth = date( 'm', $ts );
2397                 $localMonthName = date( 'n', $ts );
2398                 $localDay = date( 'j', $ts );
2399                 $localDay2 = date( 'd', $ts );
2400                 $localDayOfWeek = date( 'w', $ts );
2401                 $localWeek = date( 'W', $ts );
2402                 $localYear = date( 'Y', $ts );
2403                 $localHour = date( 'H', $ts );
2404                 if ( isset( $wgLocaltimezone ) ) {
2405                         putenv( 'TZ='.$oldtz );
2406                 }
2407                 wfRestoreWarnings();
2408
2409                 switch ( $index ) {
2410                         case 'currentmonth':
2411                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2412                         case 'currentmonthname':
2413                                 return $varCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2414                         case 'currentmonthnamegen':
2415                                 return $varCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2416                         case 'currentmonthabbrev':
2417                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2418                         case 'currentday':
2419                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2420                         case 'currentday2':
2421                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2422                         case 'localmonth':
2423                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2424                         case 'localmonthname':
2425                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2426                         case 'localmonthnamegen':
2427                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2428                         case 'localmonthabbrev':
2429                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2430                         case 'localday':
2431                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2432                         case 'localday2':
2433                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2434                         case 'pagename':
2435                                 return wfEscapeWikiText( $this->mTitle->getText() );
2436                         case 'pagenamee':
2437                                 return $this->mTitle->getPartialURL();
2438                         case 'fullpagename':
2439                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2440                         case 'fullpagenamee':
2441                                 return $this->mTitle->getPrefixedURL();
2442                         case 'subpagename':
2443                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2444                         case 'subpagenamee':
2445                                 return $this->mTitle->getSubpageUrlForm();
2446                         case 'basepagename':
2447                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2448                         case 'basepagenamee':
2449                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2450                         case 'talkpagename':
2451                                 if( $this->mTitle->canTalk() ) {
2452                                         $talkPage = $this->mTitle->getTalkPage();
2453                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2454                                 } else {
2455                                         return '';
2456                                 }
2457                         case 'talkpagenamee':
2458                                 if( $this->mTitle->canTalk() ) {
2459                                         $talkPage = $this->mTitle->getTalkPage();
2460                                         return $talkPage->getPrefixedUrl();
2461                                 } else {
2462                                         return '';
2463                                 }
2464                         case 'subjectpagename':
2465                                 $subjPage = $this->mTitle->getSubjectPage();
2466                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2467                         case 'subjectpagenamee':
2468                                 $subjPage = $this->mTitle->getSubjectPage();
2469                                 return $subjPage->getPrefixedUrl();
2470                         case 'revisionid':
2471                                 return $this->mRevisionId;
2472                         case 'revisionday':
2473                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2474                         case 'revisionday2':
2475                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2476                         case 'revisionmonth':
2477                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2478                         case 'revisionyear':
2479                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2480                         case 'revisiontimestamp':
2481                                 return $this->getRevisionTimestamp();
2482                         case 'namespace':
2483                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2484                         case 'namespacee':
2485                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2486                         case 'talkspace':
2487                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2488                         case 'talkspacee':
2489                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2490                         case 'subjectspace':
2491                                 return $this->mTitle->getSubjectNsText();
2492                         case 'subjectspacee':
2493                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2494                         case 'currentdayname':
2495                                 return $varCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2496                         case 'currentyear':
2497                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2498                         case 'currenttime':
2499                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2500                         case 'currenthour':
2501                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2502                         case 'currentweek':
2503                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2504                                 // int to remove the padding
2505                                 return $varCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2506                         case 'currentdow':
2507                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2508                         case 'localdayname':
2509                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2510                         case 'localyear':
2511                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2512                         case 'localtime':
2513                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2514                         case 'localhour':
2515                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2516                         case 'localweek':
2517                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2518                                 // int to remove the padding
2519                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2520                         case 'localdow':
2521                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2522                         case 'numberofarticles':
2523                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2524                         case 'numberoffiles':
2525                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2526                         case 'numberofusers':
2527                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2528                         case 'numberofpages':
2529                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2530                         case 'numberofadmins':
2531                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::admins() );
2532                         case 'numberofedits':
2533                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::edits() );
2534                         case 'currenttimestamp':
2535                                 return $varCache[$index] = wfTimestampNow();
2536                         case 'localtimestamp':
2537                                 return $varCache[$index] = $localTimestamp;
2538                         case 'currentversion':
2539                                 return $varCache[$index] = SpecialVersion::getVersion();
2540                         case 'sitename':
2541                                 return $wgSitename;
2542                         case 'server':
2543                                 return $wgServer;
2544                         case 'servername':
2545                                 return $wgServerName;
2546                         case 'scriptpath':
2547                                 return $wgScriptPath;
2548                         case 'directionmark':
2549                                 return $wgContLang->getDirMark();
2550                         case 'contentlanguage':
2551                                 global $wgContLanguageCode;
2552                                 return $wgContLanguageCode;
2553                         default:
2554                                 $ret = null;
2555                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2556                                         return $ret;
2557                                 else
2558                                         return null;
2559                 }
2560         }
2561
2562         /**
2563          * initialise the magic variables (like CURRENTMONTHNAME)
2564          *
2565          * @private
2566          */
2567         function initialiseVariables() {
2568                 $fname = 'Parser::initialiseVariables';
2569                 wfProfileIn( $fname );
2570                 $variableIDs = MagicWord::getVariableIDs();
2571
2572                 $this->mVariables = array();
2573                 foreach ( $variableIDs as $id ) {
2574                         $mw =& MagicWord::get( $id );
2575                         $mw->addToArray( $this->mVariables, $id );
2576                 }
2577                 wfProfileOut( $fname );
2578         }
2579
2580         /**
2581          * parse any parentheses in format ((title|part|part))
2582          * and call callbacks to get a replacement text for any found piece
2583          *
2584          * @param string $text The text to parse
2585          * @param array $callbacks rules in form:
2586          *     '{' => array(                            # opening parentheses
2587          *                                      'end' => '}',   # closing parentheses
2588          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2589          *                                                                3 => callback         # replacement callback to call if {{{..}}} is found
2590          *                                                                )
2591          *                                      )
2592          *                                      'min' => 2,     # Minimum parenthesis count in cb
2593          *                                      'max' => 3,     # Maximum parenthesis count in cb
2594          * @private
2595          */
2596         function replace_callback ($text, $callbacks) {
2597                 wfProfileIn( __METHOD__ );
2598                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2599                 $lastOpeningBrace = -1;                 # last not closed parentheses
2600
2601                 $validOpeningBraces = implode( '', array_keys( $callbacks ) );
2602
2603                 $i = 0;
2604                 while ( $i < strlen( $text ) ) {
2605                         # Find next opening brace, closing brace or pipe
2606                         if ( $lastOpeningBrace == -1 ) {
2607                                 $currentClosing = '';
2608                                 $search = $validOpeningBraces;
2609                         } else {
2610                                 $currentClosing = $openingBraceStack[$lastOpeningBrace]['braceEnd'];
2611                                 $search = $validOpeningBraces . '|' . $currentClosing;
2612                         }
2613                         $rule = null;
2614                         $i += strcspn( $text, $search, $i );
2615                         if ( $i < strlen( $text ) ) {
2616                                 if ( $text[$i] == '|' ) {
2617                                         $found = 'pipe';
2618                                 } elseif ( $text[$i] == $currentClosing ) {
2619                                         $found = 'close';
2620                                 } elseif ( isset( $callbacks[$text[$i]] ) ) {
2621                                         $found = 'open';
2622                                         $rule = $callbacks[$text[$i]];
2623                                 } else {
2624                                         # Some versions of PHP have a strcspn which stops on null characters
2625                                         # Ignore and continue
2626                                         ++$i;
2627                                         continue;
2628                                 }
2629                         } else {
2630                                 # All done
2631                                 break;
2632                         }
2633
2634                         if ( $found == 'open' ) {
2635                                 # found opening brace, let's add it to parentheses stack
2636                                 $piece = array('brace' => $text[$i],
2637                                                            'braceEnd' => $rule['end'],
2638                                                            'title' => '',
2639                                                            'parts' => null);
2640
2641                                 # count opening brace characters
2642                                 $piece['count'] = strspn( $text, $piece['brace'], $i );
2643                                 $piece['startAt'] = $piece['partStart'] = $i + $piece['count'];
2644                                 $i += $piece['count'];
2645
2646                                 # we need to add to stack only if opening brace count is enough for one of the rules
2647                                 if ( $piece['count'] >= $rule['min'] ) {
2648                                         $lastOpeningBrace ++;
2649                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2650                                 }
2651                         } elseif ( $found == 'close' ) {
2652                                 # lets check if it is enough characters for closing brace
2653                                 $maxCount = $openingBraceStack[$lastOpeningBrace]['count'];
2654                                 $count = strspn( $text, $text[$i], $i, $maxCount );
2655
2656                                 # check for maximum matching characters (if there are 5 closing
2657                                 # characters, we will probably need only 3 - depending on the rules)
2658                                 $matchingCount = 0;
2659                                 $matchingCallback = null;
2660                                 $cbType = $callbacks[$openingBraceStack[$lastOpeningBrace]['brace']];
2661                                 if ( $count > $cbType['max'] ) {
2662                                         # The specified maximum exists in the callback array, unless the caller
2663                                         # has made an error
2664                                         $matchingCount = $cbType['max'];
2665                                 } else {
2666                                         # Count is less than the maximum
2667                                         # Skip any gaps in the callback array to find the true largest match
2668                                         # Need to use array_key_exists not isset because the callback can be null
2669                                         $matchingCount = $count;
2670                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $cbType['cb'] ) ) {
2671                                                 --$matchingCount;
2672                                         }
2673                                 }
2674
2675                                 if ($matchingCount <= 0) {
2676                                         $i += $count;
2677                                         continue;
2678                                 }
2679                                 $matchingCallback = $cbType['cb'][$matchingCount];
2680
2681                                 # let's set a title or last part (if '|' was found)
2682                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2683                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2684                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2685                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2686                                 } else {
2687                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2688                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2689                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2690                                 }
2691
2692                                 $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2693                                 $pieceEnd = $i + $matchingCount;
2694
2695                                 if( is_callable( $matchingCallback ) ) {
2696                                         $cbArgs = array (
2697                                                                          'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2698                                                                          'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2699                                                                          'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2700                                                                          'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == "\n")),
2701                                                                          );
2702                                         # finally we can call a user callback and replace piece of text
2703                                         $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2704                                         $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2705                                         $i = $pieceStart + strlen($replaceWith);
2706                                 } else {
2707                                         # null value for callback means that parentheses should be parsed, but not replaced
2708                                         $i += $matchingCount;
2709                                 }
2710
2711                                 # reset last opening parentheses, but keep it in case there are unused characters
2712                                 $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2713                                                            'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2714                                                            'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2715                                                            'title' => '',
2716                                                            'parts' => null,
2717                                                            'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2718                                 $openingBraceStack[$lastOpeningBrace--] = null;
2719
2720                                 if ($matchingCount < $piece['count']) {
2721                                         $piece['count'] -= $matchingCount;
2722                                         $piece['startAt'] -= $matchingCount;
2723                                         $piece['partStart'] = $piece['startAt'];
2724                                         # do we still qualify for any callback with remaining count?
2725                                         $currentCbList = $callbacks[$piece['brace']]['cb'];
2726                                         while ( $piece['count'] ) {
2727                                                 if ( array_key_exists( $piece['count'], $currentCbList ) ) {
2728                                                         $lastOpeningBrace++;
2729                                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2730                                                         break;
2731                                                 }
2732                                                 --$piece['count'];
2733                                         }
2734                                 }
2735                         } elseif ( $found == 'pipe' ) {
2736                                 # lets set a title if it is a first separator, or next part otherwise
2737                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2738                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2739                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2740                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2741                                         $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2742                                 } else {
2743                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2744                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2745                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2746                                 }
2747                                 $openingBraceStack[$lastOpeningBrace]['partStart'] = ++$i;
2748                         }
2749                 }
2750
2751                 wfProfileOut( __METHOD__ );
2752                 return $text;
2753         }
2754
2755         /**
2756          * Replace magic variables, templates, and template arguments
2757          * with the appropriate text. Templates are substituted recursively,
2758          * taking care to avoid infinite loops.
2759          *
2760          * Note that the substitution depends on value of $mOutputType:
2761          *  OT_WIKI: only {{subst:}} templates
2762          *  OT_MSG: only magic variables
2763          *  OT_HTML: all templates and magic variables
2764          *
2765          * @param string $tex The text to transform
2766          * @param array $args Key-value pairs representing template parameters to substitute
2767          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2768          * @private
2769          */
2770         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2771                 # Prevent too big inclusions
2772                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2773                         return $text;
2774                 }
2775
2776                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2777                 wfProfileIn( $fname );
2778
2779                 # This function is called recursively. To keep track of arguments we need a stack:
2780                 array_push( $this->mArgStack, $args );
2781
2782                 $braceCallbacks = array();
2783                 if ( !$argsOnly ) {
2784                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2785                 }
2786                 if ( $this->mOutputType != OT_MSG ) {
2787                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2788                 }
2789                 if ( $braceCallbacks ) {
2790                         $callbacks = array(
2791                                 '{' => array(
2792                                         'end' => '}',
2793                                         'cb' => $braceCallbacks,
2794                                         'min' => $argsOnly ? 3 : 2,
2795                                         'max' => isset( $braceCallbacks[3] ) ? 3 : 2,
2796                                 ),
2797                                 '[' => array(
2798                                         'end' => ']',
2799                                         'cb' => array(2=>null),
2800                                         'min' => 2,
2801                                         'max' => 2,
2802                                 )
2803                         );
2804                         $text = $this->replace_callback ($text, $callbacks);
2805
2806                         array_pop( $this->mArgStack );
2807                 }
2808                 wfProfileOut( $fname );
2809                 return $text;
2810         }
2811
2812         /**
2813          * Replace magic variables
2814          * @private
2815          */
2816         function variableSubstitution( $matches ) {
2817                 global $wgContLang;
2818                 $fname = 'Parser::variableSubstitution';
2819                 $varname = $wgContLang->lc($matches[1]);
2820                 wfProfileIn( $fname );
2821                 $skip = false;
2822                 if ( $this->mOutputType == OT_WIKI ) {
2823                         # Do only magic variables prefixed by SUBST
2824                         $mwSubst =& MagicWord::get( 'subst' );
2825                         if (!$mwSubst->matchStartAndRemove( $varname ))
2826                                 $skip = true;
2827                         # Note that if we don't substitute the variable below,
2828                         # we don't remove the {{subst:}} magic word, in case
2829                         # it is a template rather than a magic variable.
2830                 }
2831                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2832                         $id = $this->mVariables[$varname];
2833                         # Now check if we did really match, case sensitive or not
2834                         $mw =& MagicWord::get( $id );
2835                         if ($mw->match($matches[1])) {
2836                                 $text = $this->getVariableValue( $id );
2837                                 if (MagicWord::getCacheTTL($id)>-1)
2838                                         $this->mOutput->mContainsOldMagic = true;
2839                         } else {
2840                                 $text = $matches[0];
2841                         }
2842                 } else {
2843                         $text = $matches[0];
2844                 }
2845                 wfProfileOut( $fname );
2846                 return $text;
2847         }
2848
2849
2850         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2851         static function createAssocArgs( $args ) {
2852                 $assocArgs = array();
2853                 $index = 1;
2854                 foreach( $args as $arg ) {
2855                         $eqpos = strpos( $arg, '=' );
2856                         if ( $eqpos === false ) {
2857                                 $assocArgs[$index++] = $arg;
2858                         } else {
2859                                 $name = trim( substr( $arg, 0, $eqpos ) );
2860                                 $value = trim( substr( $arg, $eqpos+1 ) );
2861                                 if ( $value === false ) {
2862                                         $value = '';
2863                                 }
2864                                 if ( $name !== false ) {
2865                                         $assocArgs[$name] = $value;
2866                                 }
2867                         }
2868                 }
2869
2870                 return $assocArgs;
2871         }
2872
2873         /**
2874          * Return the text of a template, after recursively
2875          * replacing any variables or templates within the template.
2876          *
2877          * @param array $piece The parts of the template
2878          *  $piece['text']: matched text
2879          *  $piece['title']: the title, i.e. the part before the |
2880          *  $piece['parts']: the parameter array
2881          * @return string the text of the template
2882          * @private
2883          */
2884         function braceSubstitution( $piece ) {
2885                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2886                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2887                 wfProfileIn( $fname );
2888                 wfProfileIn( __METHOD__.'-setup' );
2889
2890                 # Flags
2891                 $found = false;             # $text has been filled
2892                 $nowiki = false;            # wiki markup in $text should be escaped
2893                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2894                 $noargs = false;            # Don't replace triple-brace arguments in $text
2895                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2896                 $headingOffset = 0;         # Skip headings when number, to account for those that weren't transcluded.
2897                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2898                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2899
2900                 # Title object, where $text came from
2901                 $title = NULL;
2902
2903                 $linestart = '';
2904
2905
2906                 # $part1 is the bit before the first |, and must contain only title characters
2907                 # $args is a list of arguments, starting from index 0, not including $part1
2908
2909                 $titleText = $part1 = $piece['title'];
2910                 # If the third subpattern matched anything, it will start with |
2911
2912                 if (null == $piece['parts']) {
2913                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2914                         if ($replaceWith != $piece['text']) {
2915                                 $text = $replaceWith;
2916                                 $found = true;
2917                                 $noparse = true;
2918                                 $noargs = true;
2919                         }
2920                 }
2921
2922                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2923                 wfProfileOut( __METHOD__.'-setup' );
2924
2925                 # SUBST
2926                 wfProfileIn( __METHOD__.'-modifiers' );
2927                 if ( !$found ) {
2928                         $mwSubst =& MagicWord::get( 'subst' );
2929                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2930                                 # One of two possibilities is true:
2931                                 # 1) Found SUBST but not in the PST phase
2932                                 # 2) Didn't find SUBST and in the PST phase
2933                                 # In either case, return without further processing
2934                                 $text = $piece['text'];
2935                                 $found = true;
2936                                 $noparse = true;
2937                                 $noargs = true;
2938                         }
2939                 }
2940
2941                 # MSG, MSGNW and RAW
2942                 if ( !$found ) {
2943                         # Check for MSGNW:
2944                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2945                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2946                                 $nowiki = true;
2947                         } else {
2948                                 # Remove obsolete MSG:
2949                                 $mwMsg =& MagicWord::get( 'msg' );
2950                                 $mwMsg->matchStartAndRemove( $part1 );
2951                         }
2952
2953                         # Check for RAW:
2954                         $mwRaw =& MagicWord::get( 'raw' );
2955                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2956                                 $forceRawInterwiki = true;
2957                         }
2958                 }
2959                 wfProfileOut( __METHOD__.'-modifiers' );
2960
2961                 //save path level before recursing into functions & templates.
2962                 $lastPathLevel = $this->mTemplatePath;
2963
2964                 # Parser functions
2965                 if ( !$found ) {
2966                         wfProfileIn( __METHOD__ . '-pfunc' );
2967
2968                         $colonPos = strpos( $part1, ':' );
2969                         if ( $colonPos !== false ) {
2970                                 # Case sensitive functions
2971                                 $function = substr( $part1, 0, $colonPos );
2972                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2973                                         $function = $this->mFunctionSynonyms[1][$function];
2974                                 } else {
2975                                         # Case insensitive functions
2976                                         $function = strtolower( $function );
2977                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2978                                                 $function = $this->mFunctionSynonyms[0][$function];
2979                                         } else {
2980                                                 $function = false;
2981                                         }
2982                                 }
2983                                 if ( $function ) {
2984                                         $funcArgs = array_map( 'trim', $args );
2985                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2986                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2987                                         $found = true;
2988
2989                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2990                                         //$noargs = true;
2991                                         //$noparse = true;
2992
2993                                         if ( is_array( $result ) ) {
2994                                                 if ( isset( $result[0] ) ) {
2995                                                         $text = $linestart . $result[0];
2996                                                         unset( $result[0] );
2997                                                 }
2998
2999                                                 // Extract flags into the local scope
3000                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
3001                                                 extract( $result );
3002                                         } else {
3003                                                 $text = $linestart . $result;
3004                                         }
3005                                 }
3006                         }
3007                         wfProfileOut( __METHOD__ . '-pfunc' );
3008                 }
3009
3010                 # Template table test
3011
3012                 # Did we encounter this template already? If yes, it is in the cache
3013                 # and we need to check for loops.
3014                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
3015                         $found = true;
3016
3017                         # Infinite loop test
3018                         if ( isset( $this->mTemplatePath[$part1] ) ) {
3019                                 $noparse = true;
3020                                 $noargs = true;
3021                                 $found = true;
3022                                 $text = $linestart .
3023                                         "[[$part1]]<!-- WARNING: template loop detected -->";
3024                                 wfDebug( __METHOD__.": template loop broken at '$part1'\n" );
3025                         } else {
3026                                 # set $text to cached message.
3027                                 $text = $linestart . $this->mTemplates[$piece['title']];
3028                                 #treat title for cached page the same as others
3029                                 $ns = NS_TEMPLATE;
3030                                 $subpage = '';
3031                                 $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3032                                 if ($subpage !== '') {
3033                                   $ns = $this->mTitle->getNamespace();
3034                                 }
3035                                 $title = Title::newFromText( $part1, $ns );
3036                                 //used by include size checking
3037                                 $titleText = $title->getPrefixedText();
3038                                 //used by edit section links
3039                                 $replaceHeadings = true;
3040
3041                         }
3042                 }
3043
3044                 # Load from database
3045                 if ( !$found ) {
3046                         wfProfileIn( __METHOD__ . '-loadtpl' );
3047                         $ns = NS_TEMPLATE;
3048                         # declaring $subpage directly in the function call
3049                         # does not work correctly with references and breaks
3050                         # {{/subpage}}-style inclusions
3051                         $subpage = '';
3052                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3053                         if ($subpage !== '') {
3054                                 $ns = $this->mTitle->getNamespace();
3055                         }
3056                         $title = Title::newFromText( $part1, $ns );
3057
3058
3059                         if ( !is_null( $title ) ) {
3060                                 $titleText = $title->getPrefixedText();
3061                                 # Check for language variants if the template is not found
3062                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
3063                                         $wgContLang->findVariantLink($part1, $title);
3064                                 }
3065
3066                                 if ( !$title->isExternal() ) {
3067                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
3068                                                 $text = SpecialPage::capturePath( $title );
3069                                                 if ( is_string( $text ) ) {
3070                                                         $found = true;
3071                                                         $noparse = true;
3072                                                         $noargs = true;
3073                                                         $isHTML = true;
3074                                                         $this->disableCache();
3075                                                 }
3076                                         } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3077                                                 $found = false; //access denied
3078                                                 wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
3079                                         } else {
3080                                                 list($articleContent,$title) = $this->fetchTemplateAndtitle( $title );
3081                                                 if ( $articleContent !== false ) {
3082                                                         $found = true;
3083                                                         $text = $articleContent;
3084                                                         $replaceHeadings = true;
3085                                                 }
3086                                         }
3087
3088                                         # If the title is valid but undisplayable, make a link to it
3089                                         if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3090                                                 $text = "[[:$titleText]]";
3091                                                 $found = true;
3092                                         }
3093                                 } elseif ( $title->isTrans() ) {
3094                                         // Interwiki transclusion
3095                                         if ( $this->ot['html'] && !$forceRawInterwiki ) {
3096                                                 $text = $this->interwikiTransclude( $title, 'render' );
3097                                                 $isHTML = true;
3098                                                 $noparse = true;
3099                                         } else {
3100                                                 $text = $this->interwikiTransclude( $title, 'raw' );
3101                                                 $replaceHeadings = true;
3102                                         }
3103                                         $found = true;
3104                                 }
3105
3106                                 # Template cache array insertion
3107                                 # Use the original $piece['title'] not the mangled $part1, so that
3108                                 # modifiers such as RAW: produce separate cache entries
3109                                 if( $found ) {
3110                                         if( $isHTML ) {
3111                                                 // A special page; don't store it in the template cache.
3112                                         } else {
3113                                                 $this->mTemplates[$piece['title']] = $text;
3114                                         }
3115                                         $text = $linestart . $text;
3116                                 }
3117                         }
3118                         wfProfileOut( __METHOD__ . '-loadtpl' );
3119                 }
3120
3121                 if ( $found && !$this->incrementIncludeSize( 'pre-expand', strlen( $text ) ) ) {
3122                         # Error, oversize inclusion
3123                         $text = $linestart .
3124                                 "[[$titleText]]<!-- WARNING: template omitted, pre-expand include size too large -->";
3125                         $noparse = true;
3126                         $noargs = true;
3127                 }
3128
3129                 # Recursive parsing, escaping and link table handling
3130                 # Only for HTML output
3131                 if ( $nowiki && $found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3132                         $text = wfEscapeWikiText( $text );
3133                 } elseif ( !$this->ot['msg'] && $found ) {
3134                         if ( $noargs ) {
3135                                 $assocArgs = array();
3136                         } else {
3137                                 # Clean up argument array
3138                                 $assocArgs = self::createAssocArgs($args);
3139                                 # Add a new element to the templace recursion path
3140                                 $this->mTemplatePath[$part1] = 1;
3141                         }
3142
3143                         if ( !$noparse ) {
3144                                 # If there are any <onlyinclude> tags, only include them
3145                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
3146                                         $replacer = new OnlyIncludeReplacer;
3147                                         StringUtils::delimiterReplaceCallback( '<onlyinclude>', '</onlyinclude>',
3148                                                 array( &$replacer, 'replace' ), $text );
3149                                         $text = $replacer->output;
3150                                 }
3151                                 # Remove <noinclude> sections and <includeonly> tags
3152                                 $text = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $text );
3153                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
3154
3155                                 if( $this->ot['html'] || $this->ot['pre'] ) {
3156                                         # Strip <nowiki>, <pre>, etc.
3157                                         $text = $this->strip( $text, $this->mStripState );
3158                                         if ( $this->ot['html'] ) {
3159                                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
3160                                         } elseif ( $this->ot['pre'] && $this->mOptions->getRemoveComments() ) {
3161                                                 $text = Sanitizer::removeHTMLcomments( $text );
3162                                         }
3163                                 }
3164                                 $text = $this->replaceVariables( $text, $assocArgs );
3165
3166                                 # If the template begins with a table or block-level
3167                                 # element, it should be treated as beginning a new line.
3168                                 if (!$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3169                                         $text = "\n" . $text;
3170                                 }
3171                         } elseif ( !$noargs ) {
3172                                 # $noparse and !$noargs
3173                                 # Just replace the arguments, not any double-brace items
3174                                 # This is used for rendered interwiki transclusion
3175                                 $text = $this->replaceVariables( $text, $assocArgs, true );
3176                         }
3177                 }
3178                 # Prune lower levels off the recursion check path
3179                 $this->mTemplatePath = $lastPathLevel;
3180
3181                 if ( $found && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3182                         # Error, oversize inclusion
3183                         $text = $linestart .
3184                                 "[[$titleText]]<!-- WARNING: template omitted, post-expand include size too large -->";
3185                         $noparse = true;
3186                         $noargs = true;
3187                 }
3188
3189                 if ( !$found ) {
3190                         wfProfileOut( $fname );
3191                         return $piece['text'];
3192                 } else {
3193                         wfProfileIn( __METHOD__ . '-placeholders' );
3194                         if ( $isHTML ) {
3195                                 # Replace raw HTML by a placeholder
3196                                 # Add a blank line preceding, to prevent it from mucking up
3197                                 # immediately preceding headings
3198                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
3199                         } else {
3200                                 # replace ==section headers==
3201                                 # XXX this needs to go away once we have a better parser.
3202                                 if ( !$this->ot['wiki'] && !$this->ot['pre'] && $replaceHeadings ) {
3203                                         if( !is_null( $title ) )
3204                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3205                                         else
3206                                                 $encodedname = base64_encode("");
3207                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3208                                                 PREG_SPLIT_DELIM_CAPTURE);
3209                                         $text = '';
3210                                         $nsec = $headingOffset;
3211
3212                                         for( $i = 0; $i < count($m); $i += 2 ) {
3213                                                 $text .= $m[$i];
3214                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3215                                                 $hl = $m[$i + 1];
3216                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3217                                                         $text .= $hl;
3218                                                         continue;
3219                                                 }
3220                                                 $m2 = array();
3221                                                 preg_match('/^(={1,6})(.*?)(={1,6}\s*?)$/m', $hl, $m2);
3222                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3223                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3224
3225                                                 $nsec++;
3226                                         }
3227                                 }
3228                         }
3229                         wfProfileOut( __METHOD__ . '-placeholders' );
3230                 }
3231
3232                 # Prune lower levels off the recursion check path
3233                 $this->mTemplatePath = $lastPathLevel;
3234
3235                 if ( !$found ) {
3236                         wfProfileOut( $fname );
3237                         return $piece['text'];
3238                 } else {
3239                         wfProfileOut( $fname );
3240                         return $text;
3241                 }
3242         }
3243
3244         /**
3245          * Fetch the unparsed text of a template and register a reference to it.
3246          */
3247         function fetchTemplateAndTitle( $title ) {
3248                 $templateCb = $this->mOptions->getTemplateCallback();
3249                 $stuff = call_user_func( $templateCb, $title );
3250                 $text = $stuff['text'];
3251                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3252                 if ( isset( $stuff['deps'] ) ) {
3253                         foreach ( $stuff['deps'] as $dep ) {
3254                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3255                         }
3256                 }
3257                 return array($text,$finalTitle);
3258         }
3259
3260         function fetchTemplate( $title ) {
3261                 $rv = $this->fetchTemplateAndtitle($title);
3262                 return $rv[0];
3263         }
3264
3265         /**
3266          * Static function to get a template
3267          * Can be overridden via ParserOptions::setTemplateCallback().
3268          *
3269          * Returns an associative array:
3270          *    text          The unparsed template text
3271          *    finalTitle    (Optional) The title after following redirects
3272          *    deps          (Optional) An array of associative array dependencies:
3273          *                       title:    The dependency title, to be registered in templatelinks
3274          *                       page_id:  The page_id of the title
3275          *                       rev_id:   The revision ID loaded
3276          */
3277         static function statelessFetchTemplate( $title ) {
3278                 $text = $skip = false;
3279                 $finalTitle = $title;
3280                 $deps = array();
3281
3282                 // Loop to fetch the article, with up to 1 redirect
3283                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3284                         # Give extensions a chance to select the revision instead
3285                         $id = false; // Assume current
3286                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( false, &$title, &$skip, &$id ) );
3287
3288                         if( $skip ) {
3289                                 $text = false;
3290                                 $deps[] = array(
3291                                         'title' => $title,
3292                                         'page_id' => $title->getArticleID(),
3293                                         'rev_id' => null );
3294                                 break;
3295                         }
3296                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3297                         $rev_id = $rev ? $rev->getId() : 0;
3298
3299                         $deps[] = array(
3300                                 'title' => $title,
3301                                 'page_id' => $title->getArticleID(),
3302                                 'rev_id' => $rev_id );
3303
3304                         if( $rev ) {
3305                                 $text = $rev->getText();
3306                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3307                                 global $wgLang;
3308                                 $message = $wgLang->lcfirst( $title->getText() );
3309                                 $text = wfMsgForContentNoTrans( $message );
3310                                 if( wfEmptyMsg( $message, $text ) ) {
3311                                         $text = false;
3312                                         break;
3313                                 }
3314                         } else {
3315                                 break;
3316                         }
3317                         if ( $text === false ) {
3318                                 break;
3319                         }
3320                         // Redirect?
3321                         $finalTitle = $title;
3322                         $title = Title::newFromRedirect( $text );
3323                 }
3324                 return array(
3325                         'text' => $text,
3326                         'finalTitle' => $finalTitle,
3327                         'deps' => $deps );
3328         }
3329
3330         /**
3331          * Transclude an interwiki link.
3332          */
3333         function interwikiTransclude( $title, $action ) {
3334                 global $wgEnableScaryTranscluding;
3335
3336                 if (!$wgEnableScaryTranscluding)
3337                         return wfMsg('scarytranscludedisabled');
3338
3339                 $url = $title->getFullUrl( "action=$action" );
3340
3341                 if (strlen($url) > 255)
3342                         return wfMsg('scarytranscludetoolong');
3343                 return $this->fetchScaryTemplateMaybeFromCache($url);
3344         }
3345
3346         function fetchScaryTemplateMaybeFromCache($url) {
3347                 global $wgTranscludeCacheExpiry;
3348                 $dbr = wfGetDB(DB_SLAVE);
3349                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3350                                 array('tc_url' => $url));
3351                 if ($obj) {
3352                         $time = $obj->tc_time;
3353                         $text = $obj->tc_contents;
3354                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3355                                 return $text;
3356                         }
3357                 }
3358
3359                 $text = Http::get($url);
3360                 if (!$text)
3361                         return wfMsg('scarytranscludefailed', $url);
3362
3363                 $dbw = wfGetDB(DB_MASTER);
3364                 $dbw->replace('transcache', array('tc_url'), array(
3365                         'tc_url' => $url,
3366                         'tc_time' => time(),
3367                         'tc_contents' => $text));
3368                 return $text;
3369         }
3370
3371
3372         /**
3373          * Triple brace replacement -- used for template arguments
3374          * @private
3375          */
3376         function argSubstitution( $matches ) {
3377                 $arg = trim( $matches['title'] );
3378                 $text = $matches['text'];
3379                 $inputArgs = end( $this->mArgStack );
3380
3381                 if ( array_key_exists( $arg, $inputArgs ) ) {
3382                         $text = $inputArgs[$arg];
3383                 } else if (($this->mOutputType == OT_HTML || $this->mOutputType == OT_PREPROCESS ) &&
3384                 null != $matches['parts'] && count($matches['parts']) > 0) {
3385                         $text = $matches['parts'][0];
3386                 }
3387                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3388                         $text = $matches['text'] .
3389                                 '<!-- WARNING: argument omitted, expansion size too large -->';
3390                 }
3391
3392                 return $text;
3393         }
3394
3395         /**
3396          * Increment an include size counter
3397          *
3398          * @param string $type The type of expansion
3399          * @param integer $size The size of the text
3400          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3401          */
3402         function incrementIncludeSize( $type, $size ) {
3403                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3404                         return false;
3405                 } else {
3406                         $this->mIncludeSizes[$type] += $size;
3407                         return true;
3408                 }
3409         }
3410
3411         /**
3412          * Detect __NOGALLERY__ magic word and set a placeholder
3413          */
3414         function stripNoGallery( &$text ) {
3415                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3416                 # do not add TOC
3417                 $mw = MagicWord::get( 'nogallery' );
3418                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3419         }
3420
3421         /**
3422          * Find the first __TOC__ magic word and set a <!--MWTOC-->
3423          * placeholder that will then be replaced by the real TOC in
3424          * ->formatHeadings, this works because at this points real
3425          * comments will have already been discarded by the sanitizer.
3426          *
3427          * Any additional __TOC__ magic words left over will be discarded
3428          * as there can only be one TOC on the page.
3429          */
3430         function stripToc( $text ) {
3431                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3432                 # do not add TOC
3433                 $mw = MagicWord::get( 'notoc' );
3434                 if( $mw->matchAndRemove( $text ) ) {
3435                         $this->mShowToc = false;
3436                 }
3437
3438                 $mw = MagicWord::get( 'toc' );
3439                 if( $mw->match( $text ) ) {
3440                         $this->mShowToc = true;
3441                         $this->mForceTocPosition = true;
3442
3443                         // Set a placeholder. At the end we'll fill it in with the TOC.
3444                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3445
3446                         // Only keep the first one.
3447                         $text = $mw->replace( '', $text );
3448                 }
3449                 return $text;
3450         }
3451
3452         /**
3453          * This function accomplishes several tasks:
3454          * 1) Auto-number headings if that option is enabled
3455          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3456          * 3) Add a Table of contents on the top for users who have enabled the option
3457          * 4) Auto-anchor headings
3458          *
3459          * It loops through all headlines, collects the necessary data, then splits up the
3460          * string and re-inserts the newly formatted headlines.
3461          *
3462          * @param string $text
3463          * @param boolean $isMain
3464          * @private
3465          */
3466         function formatHeadings( $text, $isMain=true ) {
3467                 global $wgMaxTocLevel, $wgContLang;
3468
3469                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3470                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3471                         $showEditLink = 0;
3472                 } else {
3473                         $showEditLink = $this->mOptions->getEditSection();
3474                 }
3475
3476                 # Inhibit editsection links if requested in the page
3477                 $esw =& MagicWord::get( 'noeditsection' );
3478                 if( $esw->matchAndRemove( $text ) ) {
3479                         $showEditLink = 0;
3480                 }
3481
3482                 # Get all headlines for numbering them and adding funky stuff like [edit]
3483                 # links - this is for later, but we need the number of headlines right now
3484                 $matches = array();
3485                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3486
3487                 # if there are fewer than 4 headlines in the article, do not show TOC
3488                 # unless it's been explicitly enabled.
3489                 $enoughToc = $this->mShowToc &&
3490                         (($numMatches >= 4) || $this->mForceTocPosition);
3491
3492                 # Allow user to stipulate that a page should have a "new section"
3493                 # link added via __NEWSECTIONLINK__
3494                 $mw =& MagicWord::get( 'newsectionlink' );
3495                 if( $mw->matchAndRemove( $text ) )
3496                         $this->mOutput->setNewSection( true );
3497
3498                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3499                 # override above conditions and always show TOC above first header
3500                 $mw =& MagicWord::get( 'forcetoc' );
3501                 if ($mw->matchAndRemove( $text ) ) {
3502                         $this->mShowToc = true;
3503                         $enoughToc = true;
3504                 }
3505
3506                 # We need this to perform operations on the HTML
3507                 $sk = $this->mOptions->getSkin();
3508
3509                 # headline counter
3510                 $headlineCount = 0;
3511                 $sectionCount = 0; # headlineCount excluding template sections
3512                 $numVisible = 0;
3513
3514                 # Ugh .. the TOC should have neat indentation levels which can be
3515                 # passed to the skin functions. These are determined here
3516                 $toc = '';
3517                 $full = '';
3518                 $head = array();
3519                 $sublevelCount = array();
3520                 $levelCount = array();
3521                 $toclevel = 0;
3522                 $level = 0;
3523                 $prevlevel = 0;
3524                 $toclevel = 0;
3525                 $prevtoclevel = 0;
3526                 $tocraw = array();
3527
3528                 foreach( $matches[3] as $headline ) {
3529                         $istemplate = 0;
3530                         $templatetitle = '';
3531                         $templatesection = 0;
3532                         $numbering = '';
3533                         $mat = array();
3534                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3535                                 $istemplate = 1;
3536                                 $templatetitle = base64_decode($mat[1]);
3537                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3538                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3539                         }
3540
3541                         if( $toclevel ) {
3542                                 $prevlevel = $level;
3543                                 $prevtoclevel = $toclevel;
3544                         }
3545                         $level = $matches[1][$headlineCount];
3546
3547                         if( $doNumberHeadings || $enoughToc ) {
3548
3549                                 if ( $level > $prevlevel ) {
3550                                         # Increase TOC level
3551                                         $toclevel++;
3552                                         $sublevelCount[$toclevel] = 0;
3553                                         if( $toclevel<$wgMaxTocLevel ) {
3554                                                 $prevtoclevel = $toclevel;
3555                                                 $toc .= $sk->tocIndent();
3556                                                 $numVisible++;
3557                                         }
3558                                 }
3559                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3560                                         # Decrease TOC level, find level to jump to
3561
3562                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3563                                                 # Can only go down to level 1
3564                                                 $toclevel = 1;
3565                                         } else {
3566                                                 for ($i = $toclevel; $i > 0; $i--) {
3567                                                         if ( $levelCount[$i] == $level ) {
3568                                                                 # Found last matching level
3569                                                                 $toclevel = $i;
3570                                                                 break;
3571                                                         }
3572                                                         elseif ( $levelCount[$i] < $level ) {
3573                                                                 # Found first matching level below current level
3574                                                                 $toclevel = $i + 1;
3575                                                                 break;
3576                                                         }
3577                                                 }
3578                                         }
3579                                         if( $toclevel<$wgMaxTocLevel ) {
3580                                                 if($prevtoclevel < $wgMaxTocLevel) {
3581                                                         # Unindent only if the previous toc level was shown :p
3582                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3583                                                 } else {
3584                                                         $toc .= $sk->tocLineEnd();
3585                                                 }
3586                                         }
3587                                 }
3588                                 else {
3589                                         # No change in level, end TOC line
3590                                         if( $toclevel<$wgMaxTocLevel ) {
3591                                                 $toc .= $sk->tocLineEnd();
3592                                         }
3593                                 }
3594
3595                                 $levelCount[$toclevel] = $level;
3596
3597                                 # count number of headlines for each level
3598                                 @$sublevelCount[$toclevel]++;
3599                                 $dot = 0;
3600                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3601                                         if( !empty( $sublevelCount[$i] ) ) {
3602                                                 if( $dot ) {
3603                                                         $numbering .= '.';
3604                                                 }
3605                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3606                                                 $dot = 1;
3607                                         }
3608                                 }
3609                         }
3610
3611                         # The canonized header is a version of the header text safe to use for links
3612                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3613                         $canonized_headline = $this->mStripState->unstripBoth( $headline );
3614
3615                         # Remove link placeholders by the link text.
3616                         #     <!--LINK number-->
3617                         # turns into
3618                         #     link text with suffix
3619                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3620                                                             "\$this->mLinkHolders['texts'][\$1]",
3621                                                             $canonized_headline );
3622                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3623                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3624                                                             $canonized_headline );
3625
3626                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3627                         $tocline = preg_replace(
3628                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3629                                 array( '',                          '<$1>'),
3630                                 $canonized_headline
3631                         );
3632                         $tocline = trim( $tocline );
3633
3634                         # For the anchor, strip out HTML-y stuff period
3635                         $canonized_headline = preg_replace( '/<.*?'.'>/', '', $canonized_headline );
3636                         $canonized_headline = trim( $canonized_headline );
3637
3638                         # Save headline for section edit hint before it's escaped
3639                         $headline_hint = $canonized_headline;
3640                         $canonized_headline = Sanitizer::escapeId( $canonized_headline );
3641                         $refers[$headlineCount] = $canonized_headline;
3642
3643                         # count how many in assoc. array so we can track dupes in anchors
3644                         isset( $refers[$canonized_headline] ) ? $refers[$canonized_headline]++ : $refers[$canonized_headline] = 1;
3645                         $refcount[$headlineCount]=$refers[$canonized_headline];
3646
3647                         # Don't number the heading if it is the only one (looks silly)
3648                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3649                                 # the two are different if the line contains a link
3650                                 $headline=$numbering . ' ' . $headline;
3651                         }
3652
3653                         # Create the anchor for linking from the TOC to the section
3654                         $anchor = $canonized_headline;
3655                         if($refcount[$headlineCount] > 1 ) {
3656                                 $anchor .= '_' . $refcount[$headlineCount];
3657                         }
3658                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3659                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3660                                 $tocraw[] = array( 'toclevel' => $toclevel, 'level' => $level, 'line' => $tocline, 'number' => $numbering );
3661                         }
3662                         # give headline the correct <h#> tag
3663                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3664                                 if( $istemplate )
3665                                         $editlink = $sk->editSectionLinkForOther($templatetitle, $templatesection);
3666                                 else
3667                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3668                         } else {
3669                                 $editlink = '';
3670                         }
3671                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3672
3673                         $headlineCount++;
3674                         if( !$istemplate )
3675                                 $sectionCount++;
3676                 }
3677
3678                 $this->mOutput->setSections( $tocraw );
3679
3680                 # Never ever show TOC if no headers
3681                 if( $numVisible < 1 ) {
3682                         $enoughToc = false;
3683                 }
3684
3685                 if( $enoughToc ) {
3686                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3687                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3688                         }
3689                         $toc = $sk->tocList( $toc );
3690                 }
3691
3692                 # split up and insert constructed headlines
3693
3694                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3695                 $i = 0;
3696
3697                 foreach( $blocks as $block ) {
3698                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3699                                 # This is the [edit] link that appears for the top block of text when
3700                                 # section editing is enabled
3701
3702                                 # Disabled because it broke block formatting
3703                                 # For example, a bullet point in the top line
3704                                 # $full .= $sk->editSectionLink(0);
3705                         }
3706                         $full .= $block;
3707                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3708                                 # Top anchor now in skin
3709                                 $full = $full.$toc;
3710                         }
3711
3712                         if( !empty( $head[$i] ) ) {
3713                                 $full .= $head[$i];
3714                         }
3715                         $i++;
3716                 }
3717                 if( $this->mForceTocPosition ) {
3718                         return str_replace( '<!--MWTOC-->', $toc, $full );
3719                 } else {
3720                         return $full;
3721                 }
3722         }
3723
3724         /**
3725          * Transform wiki markup when saving a page by doing \r\n -> \n
3726          * conversion, substitting signatures, {{subst:}} templates, etc.
3727          *
3728          * @param string $text the text to transform
3729          * @param Title &$title the Title object for the current article
3730          * @param User &$user the User object describing the current user
3731          * @param ParserOptions $options parsing options
3732          * @param bool $clearState whether to clear the parser state first
3733          * @return string the altered wiki markup
3734          * @public
3735          */
3736         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3737                 $this->mOptions = $options;
3738                 $this->mTitle =& $title;
3739                 $this->setOutputType( OT_WIKI );
3740
3741                 if ( $clearState ) {
3742                         $this->clearState();
3743                 }
3744
3745                 $stripState = new StripState;
3746                 $pairs = array(
3747                         "\r\n" => "\n",
3748                 );
3749                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3750                 $text = $this->strip( $text, $stripState, true, array( 'gallery' ) );
3751                 $text = $this->pstPass2( $text, $stripState, $user );
3752                 $text = $stripState->unstripBoth( $text );
3753                 return $text;
3754         }
3755
3756         /**
3757          * Pre-save transform helper function
3758          * @private
3759          */
3760         function pstPass2( $text, &$stripState, $user ) {
3761                 global $wgContLang, $wgLocaltimezone;
3762
3763                 /* Note: This is the timestamp saved as hardcoded wikitext to
3764                  * the database, we use $wgContLang here in order to give
3765                  * everyone the same signature and use the default one rather
3766                  * than the one selected in each user's preferences.
3767                  */
3768                 if ( isset( $wgLocaltimezone ) ) {
3769                         $oldtz = getenv( 'TZ' );
3770                         putenv( 'TZ='.$wgLocaltimezone );
3771                 }
3772                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3773                   ' (' . date( 'T' ) . ')';
3774                 if ( isset( $wgLocaltimezone ) ) {
3775                         putenv( 'TZ='.$oldtz );
3776                 }
3777
3778                 # Variable replacement
3779                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3780                 $text = $this->replaceVariables( $text );
3781
3782                 # Strip out <nowiki> etc. added via replaceVariables
3783                 $text = $this->strip( $text, $stripState, false, array( 'gallery' ) );
3784
3785                 # Signatures
3786                 $sigText = $this->getUserSig( $user );
3787                 $text = strtr( $text, array(
3788                         '~~~~~' => $d,
3789                         '~~~~' => "$sigText $d",
3790                         '~~~' => $sigText
3791                 ) );
3792
3793                 # Context links: [[|name]] and [[name (context)|]]
3794                 #
3795                 global $wgLegalTitleChars;
3796                 $tc = "[$wgLegalTitleChars]";
3797                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3798
3799                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3800                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3801                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3802
3803                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3804                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3805                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3806
3807                 $t = $this->mTitle->getText();
3808                 $m = array();
3809                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3810                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3811                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3812                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3813                 } else {
3814                         # if there's no context, don't bother duplicating the title
3815                         $text = preg_replace( $p2, '[[\\1]]', $text );
3816                 }
3817
3818                 # Trim trailing whitespace
3819                 $text = rtrim( $text );
3820
3821                 return $text;
3822         }
3823
3824         /**
3825          * Fetch the user's signature text, if any, and normalize to
3826          * validated, ready-to-insert wikitext.
3827          *
3828          * @param User $user
3829          * @return string
3830          * @private
3831          */
3832         function getUserSig( &$user ) {
3833                 global $wgMaxSigChars;
3834
3835                 $username = $user->getName();
3836                 $nickname = $user->getOption( 'nickname' );
3837                 $nickname = $nickname === '' ? $username : $nickname;
3838
3839                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
3840                         $nickname = $username;
3841                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
3842                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
3843                         # Sig. might contain markup; validate this
3844                         if( $this->validateSig( $nickname ) !== false ) {
3845                                 # Validated; clean up (if needed) and return it
3846                                 return $this->cleanSig( $nickname, true );
3847                         } else {
3848                                 # Failed to validate; fall back to the default
3849                                 $nickname = $username;
3850                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3851                         }
3852                 }
3853
3854                 // Make sure nickname doesnt get a sig in a sig
3855                 $nickname = $this->cleanSigInSig( $nickname );
3856
3857                 # If we're still here, make it a link to the user page
3858                 $userText = wfEscapeWikiText( $username );
3859                 $nickText = wfEscapeWikiText( $nickname );
3860                 if ( $user->isAnon() )  {
3861                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
3862                 } else {
3863                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
3864                 }
3865         }
3866
3867         /**
3868          * Check that the user's signature contains no bad XML
3869          *
3870          * @param string $text
3871          * @return mixed An expanded string, or false if invalid.
3872          */
3873         function validateSig( $text ) {
3874                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3875         }
3876
3877         /**
3878          * Clean up signature text
3879          *
3880          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3881          * 2) Substitute all transclusions
3882          *
3883          * @param string $text
3884          * @param $parsing Whether we're cleaning (preferences save) or parsing
3885          * @return string Signature text
3886          */
3887         function cleanSig( $text, $parsing = false ) {
3888                 global $wgTitle;
3889                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3890
3891                 $substWord = MagicWord::get( 'subst' );
3892                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3893                 $substText = '{{' . $substWord->getSynonym( 0 );
3894
3895                 $text = preg_replace( $substRegex, $substText, $text );
3896                 $text = $this->cleanSigInSig( $text );
3897                 $text = $this->replaceVariables( $text );
3898
3899                 $this->clearState();
3900                 return $text;
3901         }
3902
3903         /**
3904          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3905          * @param string $text
3906          * @return string Signature text with /~{3,5}/ removed
3907          */
3908         function cleanSigInSig( $text ) {
3909                 $text = preg_replace( '/~{3,5}/', '', $text );
3910                 return $text;
3911         }
3912
3913         /**
3914          * Set up some variables which are usually set up in parse()
3915          * so that an external function can call some class members with confidence
3916          * @public
3917          */
3918         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3919                 $this->mTitle =& $title;
3920                 $this->mOptions = $options;
3921                 $this->setOutputType( $outputType );
3922                 if ( $clearState ) {
3923                         $this->clearState();
3924                 }
3925         }
3926
3927         /**
3928          * Transform a MediaWiki message by replacing magic variables.
3929          *
3930          * @param string $text the text to transform
3931          * @param ParserOptions $options  options
3932          * @return string the text with variables substituted
3933          * @public
3934          */
3935         function transformMsg( $text, $options ) {
3936                 global $wgTitle;
3937                 static $executing = false;
3938
3939                 $fname = "Parser::transformMsg";
3940
3941                 # Guard against infinite recursion
3942                 if ( $executing ) {
3943                         return $text;
3944                 }
3945                 $executing = true;
3946
3947                 wfProfileIn($fname);
3948
3949                 if ( $wgTitle && !( $wgTitle instanceof FakeTitle ) ) {
3950                         $this->mTitle = $wgTitle;
3951                 } else {
3952                         $this->mTitle = Title::newFromText('msg');
3953                 }
3954                 $this->mOptions = $options;
3955                 $this->setOutputType( OT_MSG );
3956                 $this->clearState();
3957                 $text = $this->replaceVariables( $text );
3958
3959                 $executing = false;
3960                 wfProfileOut($fname);
3961                 return $text;
3962         }
3963
3964         /**
3965          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3966          * The callback should have the following form:
3967          *    function myParserHook( $text, $params, &$parser ) { ... }
3968          *
3969          * Transform and return $text. Use $parser for any required context, e.g. use
3970          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3971          *
3972          * @public
3973          *
3974          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3975          * @param mixed $callback The callback function (and object) to use for the tag
3976          *
3977          * @return The old value of the mTagHooks array associated with the hook
3978          */
3979         function setHook( $tag, $callback ) {
3980                 $tag = strtolower( $tag );
3981                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3982                 $this->mTagHooks[$tag] = $callback;
3983
3984                 return $oldVal;
3985         }
3986
3987         function setTransparentTagHook( $tag, $callback ) {
3988                 $tag = strtolower( $tag );
3989                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
3990                 $this->mTransparentTagHooks[$tag] = $callback;
3991
3992                 return $oldVal;
3993         }
3994
3995         /**
3996          * Create a function, e.g. {{sum:1|2|3}}
3997          * The callback function should have the form:
3998          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3999          *
4000          * The callback may either return the text result of the function, or an array with the text
4001          * in element 0, and a number of flags in the other elements. The names of the flags are
4002          * specified in the keys. Valid flags are:
4003          *   found                     The text returned is valid, stop processing the template. This
4004          *                             is on by default.
4005          *   nowiki                    Wiki markup in the return value should be escaped
4006          *   noparse                   Unsafe HTML tags should not be stripped, etc.
4007          *   noargs                    Don't replace triple-brace arguments in the return value
4008          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4009          *
4010          * @public
4011          *
4012          * @param string $id The magic word ID
4013          * @param mixed $callback The callback function (and object) to use
4014          * @param integer $flags a combination of the following flags:
4015          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4016          *
4017          * @return The old callback function for this name, if any
4018          */
4019         function setFunctionHook( $id, $callback, $flags = 0 ) {
4020                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id] : null;
4021                 $this->mFunctionHooks[$id] = $callback;
4022
4023                 # Add to function cache
4024                 $mw = MagicWord::get( $id );
4025                 if( !$mw )
4026                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
4027
4028                 $synonyms = $mw->getSynonyms();
4029                 $sensitive = intval( $mw->isCaseSensitive() );
4030
4031                 foreach ( $synonyms as $syn ) {
4032                         # Case
4033                         if ( !$sensitive ) {
4034                                 $syn = strtolower( $syn );
4035                         }
4036                         # Add leading hash
4037                         if ( !( $flags & SFH_NO_HASH ) ) {
4038                                 $syn = '#' . $syn;
4039                         }
4040                         # Remove trailing colon
4041                         if ( substr( $syn, -1, 1 ) == ':' ) {
4042                                 $syn = substr( $syn, 0, -1 );
4043                         }
4044                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4045                 }
4046                 return $oldVal;
4047         }
4048
4049         /**
4050          * Get all registered function hook identifiers
4051          *
4052          * @return array
4053          */
4054         function getFunctionHooks() {
4055                 return array_keys( $this->mFunctionHooks );
4056         }
4057
4058         /**
4059          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4060          * Placeholders created in Skin::makeLinkObj()
4061          * Returns an array of links found, indexed by PDBK:
4062          *  0 - broken
4063          *  1 - normal link
4064          *  2 - stub
4065          * $options is a bit field, RLH_FOR_UPDATE to select for update
4066          */
4067         function replaceLinkHolders( &$text, $options = 0 ) {
4068                 global $wgUser;
4069                 global $wgContLang;
4070
4071                 $fname = 'Parser::replaceLinkHolders';
4072                 wfProfileIn( $fname );
4073
4074                 $pdbks = array();
4075                 $colours = array();
4076                 $sk = $this->mOptions->getSkin();
4077                 $linkCache =& LinkCache::singleton();
4078
4079                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
4080                         wfProfileIn( $fname.'-check' );
4081                         $dbr = wfGetDB( DB_SLAVE );
4082                         $page = $dbr->tableName( 'page' );
4083                         $threshold = $wgUser->getOption('stubthreshold');
4084
4085                         # Sort by namespace
4086                         asort( $this->mLinkHolders['namespaces'] );
4087
4088                         # Generate query
4089                         $query = false;
4090                         $current = null;
4091                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4092                                 # Make title object
4093                                 $title = $this->mLinkHolders['titles'][$key];
4094
4095                                 # Skip invalid entries.
4096                                 # Result will be ugly, but prevents crash.
4097                                 if ( is_null( $title ) ) {
4098                                         continue;
4099                                 }
4100                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
4101
4102                                 # Check if it's a static known link, e.g. interwiki
4103                                 if ( $title->isAlwaysKnown() ) {
4104                                         $colours[$pdbk] = 1;
4105                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
4106                                         $colours[$pdbk] = 1;
4107                                         $this->mOutput->addLink( $title, $id );
4108                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
4109                                         $colours[$pdbk] = 0;
4110                                 } elseif ( $title->getNamespace() == NS_SPECIAL && !SpecialPage::exists( $pdbk ) ) {
4111                                         $colours[$pdbk] = 0;
4112                                 } else {
4113                                         # Not in the link cache, add it to the query
4114                                         if ( !isset( $current ) ) {
4115                                                 $current = $ns;
4116                                                 $query =  "SELECT page_id, page_namespace, page_title";
4117                                                 if ( $threshold > 0 ) {
4118                                                         $query .= ', page_len, page_is_redirect';
4119                                                 }
4120                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
4121                                         } elseif ( $current != $ns ) {
4122                                                 $current = $ns;
4123                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4124                                         } else {
4125                                                 $query .= ', ';
4126                                         }
4127
4128                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4129                                 }
4130                         }
4131                         if ( $query ) {
4132                                 $query .= '))';
4133                                 if ( $options & RLH_FOR_UPDATE ) {
4134                                         $query .= ' FOR UPDATE';
4135                                 }
4136
4137                                 $res = $dbr->query( $query, $fname );
4138
4139                                 # Fetch data and form into an associative array
4140                                 # non-existent = broken
4141                                 # 1 = known
4142                                 # 2 = stub
4143                                 while ( $s = $dbr->fetchObject($res) ) {
4144                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4145                                         $pdbk = $title->getPrefixedDBkey();
4146                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4147                                         $this->mOutput->addLink( $title, $s->page_id );
4148
4149                                         $colours[$pdbk] = ( $threshold == 0 || (
4150                                                                 $s->page_len >= $threshold || # always true if $threshold <= 0
4151                                                                 $s->page_is_redirect ||
4152                                                                 !Namespace::isContent( $s->page_namespace ) )
4153                                                             ? 1 : 2 );
4154                                 }
4155                         }
4156                         wfProfileOut( $fname.'-check' );
4157
4158                         # Do a second query for different language variants of links and categories
4159                         if($wgContLang->hasVariants()){
4160                                 $linkBatch = new LinkBatch();
4161                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4162                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4163                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4164
4165                                 $categories = $this->mOutput->getCategoryLinks();
4166
4167                                 // Add variants of links to link batch
4168                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4169                                         $title = $this->mLinkHolders['titles'][$key];
4170                                         if ( is_null( $title ) )
4171                                                 continue;
4172
4173                                         $pdbk = $title->getPrefixedDBkey();
4174                                         $titleText = $title->getText();
4175
4176                                         // generate all variants of the link title text
4177                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4178
4179                                         // if link was not found (in first query), add all variants to query
4180                                         if ( !isset($colours[$pdbk]) ){
4181                                                 foreach($allTextVariants as $textVariant){
4182                                                         if($textVariant != $titleText){
4183                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4184                                                                 if(is_null($variantTitle)) continue;
4185                                                                 $linkBatch->addObj( $variantTitle );
4186                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4187                                                         }
4188                                                 }
4189                                         }
4190                                 }
4191
4192                                 // process categories, check if a category exists in some variant
4193                                 foreach( $categories as $category ){
4194                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4195                                         foreach($variants as $variant){
4196                                                 if($variant != $category){
4197                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4198                                                         if(is_null($variantTitle)) continue;
4199                                                         $linkBatch->addObj( $variantTitle );
4200                                                         $categoryMap[$variant] = $category;
4201                                                 }
4202                                         }
4203                                 }
4204
4205
4206                                 if(!$linkBatch->isEmpty()){
4207                                         // construct query
4208                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4209
4210                                         $variantQuery =  "SELECT page_id, page_namespace, page_title";
4211                                         if ( $threshold > 0 ) {
4212                                                 $variantQuery .= ', page_len, page_is_redirect';
4213                                         }
4214
4215                                         $variantQuery .= " FROM $page WHERE $titleClause";
4216                                         if ( $options & RLH_FOR_UPDATE ) {
4217                                                 $variantQuery .= ' FOR UPDATE';
4218                                         }
4219
4220                                         $varRes = $dbr->query( $variantQuery, $fname );
4221
4222                                         // for each found variants, figure out link holders and replace
4223                                         while ( $s = $dbr->fetchObject($varRes) ) {
4224
4225                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4226                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4227                                                 $vardbk = $variantTitle->getDBkey();
4228
4229                                                 $holderKeys = array();
4230                                                 if(isset($variantMap[$varPdbk])){
4231                                                         $holderKeys = $variantMap[$varPdbk];
4232                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4233                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4234                                                 }
4235
4236                                                 // loop over link holders
4237                                                 foreach($holderKeys as $key){
4238                                                         $title = $this->mLinkHolders['titles'][$key];
4239                                                         if ( is_null( $title ) ) continue;
4240
4241                                                         $pdbk = $title->getPrefixedDBkey();
4242
4243                                                         if(!isset($colours[$pdbk])){
4244                                                                 // found link in some of the variants, replace the link holder data
4245                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4246                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4247
4248                                                                 // set pdbk and colour
4249                                                                 $pdbks[$key] = $varPdbk;
4250                                                                 if ( $threshold >  0 ) {
4251                                                                         $size = $s->page_len;
4252                                                                         if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4253                                                                                 $colours[$varPdbk] = 1;
4254                                                                         } else {
4255                                                                                 $colours[$varPdbk] = 2;
4256                                                                         }
4257                                                                 }
4258                                                                 else {
4259                                                                         $colours[$varPdbk] = 1;
4260                                                                 }
4261                                                         }
4262                                                 }
4263
4264                                                 // check if the object is a variant of a category
4265                                                 if(isset($categoryMap[$vardbk])){
4266                                                         $oldkey = $categoryMap[$vardbk];
4267                                                         if($oldkey != $vardbk)
4268                                                                 $varCategories[$oldkey]=$vardbk;
4269                                                 }
4270                                         }
4271
4272                                         // rebuild the categories in original order (if there are replacements)
4273                                         if(count($varCategories)>0){
4274                                                 $newCats = array();
4275                                                 $originalCats = $this->mOutput->getCategories();
4276                                                 foreach($originalCats as $cat => $sortkey){
4277                                                         // make the replacement
4278                                                         if( array_key_exists($cat,$varCategories) )
4279                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4280                                                         else $newCats[$cat] = $sortkey;
4281                                                 }
4282                                                 $this->mOutput->setCategoryLinks($newCats);
4283                                         }
4284                                 }
4285                         }
4286
4287                         # Construct search and replace arrays
4288                         wfProfileIn( $fname.'-construct' );
4289                         $replacePairs = array();
4290                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4291                                 $pdbk = $pdbks[$key];
4292                                 $searchkey = "<!--LINK $key-->";
4293                                 $title = $this->mLinkHolders['titles'][$key];
4294                                 if ( empty( $colours[$pdbk] ) ) {
4295                                         $linkCache->addBadLinkObj( $title );
4296                                         $colours[$pdbk] = 0;
4297                                         $this->mOutput->addLink( $title, 0 );
4298                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4299                                                                         $this->mLinkHolders['texts'][$key],
4300                                                                         $this->mLinkHolders['queries'][$key] );
4301                                 } elseif ( $colours[$pdbk] == 1 ) {
4302                                         $replacePairs[$searchkey] = $sk->makeKnownLinkObj( $title,
4303                                                                         $this->mLinkHolders['texts'][$key],
4304                                                                         $this->mLinkHolders['queries'][$key] );
4305                                 } elseif ( $colours[$pdbk] == 2 ) {
4306                                         $replacePairs[$searchkey] = $sk->makeStubLinkObj( $title,
4307                                                                         $this->mLinkHolders['texts'][$key],
4308                                                                         $this->mLinkHolders['queries'][$key] );
4309                                 }
4310                         }
4311                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4312                         wfProfileOut( $fname.'-construct' );
4313
4314                         # Do the thing
4315                         wfProfileIn( $fname.'-replace' );
4316                         $text = preg_replace_callback(
4317                                 '/(<!--LINK .*?-->)/',
4318                                 $replacer->cb(),
4319                                 $text);
4320
4321                         wfProfileOut( $fname.'-replace' );
4322                 }
4323
4324                 # Now process interwiki link holders
4325                 # This is quite a bit simpler than internal links
4326                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4327                         wfProfileIn( $fname.'-interwiki' );
4328                         # Make interwiki link HTML
4329                         $replacePairs = array();
4330                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4331                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4332                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4333                         }
4334                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4335
4336                         $text = preg_replace_callback(
4337                                 '/<!--IWLINK (.*?)-->/',
4338                                 $replacer->cb(),
4339                                 $text );
4340                         wfProfileOut( $fname.'-interwiki' );
4341                 }
4342
4343                 wfProfileOut( $fname );
4344                 return $colours;
4345         }
4346
4347         /**
4348          * Replace <!--LINK--> link placeholders with plain text of links
4349          * (not HTML-formatted).
4350          * @param string $text
4351          * @return string
4352          */
4353         function replaceLinkHoldersText( $text ) {
4354                 $fname = 'Parser::replaceLinkHoldersText';
4355                 wfProfileIn( $fname );
4356
4357                 $text = preg_replace_callback(
4358                         '/<!--(LINK|IWLINK) (.*?)-->/',
4359                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4360                         $text );
4361
4362                 wfProfileOut( $fname );
4363                 return $text;
4364         }
4365
4366         /**
4367          * @param array $matches
4368          * @return string
4369          * @private
4370          */
4371         function replaceLinkHoldersTextCallback( $matches ) {
4372                 $type = $matches[1];
4373                 $key  = $matches[2];
4374                 if( $type == 'LINK' ) {
4375                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4376                                 return $this->mLinkHolders['texts'][$key];
4377                         }
4378                 } elseif( $type == 'IWLINK' ) {
4379                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4380                                 return $this->mInterwikiLinkHolders['texts'][$key];
4381                         }
4382                 }
4383                 return $matches[0];
4384         }
4385
4386         /**
4387          * Tag hook handler for 'pre'.
4388          */
4389         function renderPreTag( $text, $attribs ) {
4390                 // Backwards-compatibility hack
4391                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4392
4393                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4394                 return wfOpenElement( 'pre', $attribs ) .
4395                         Xml::escapeTagsOnly( $content ) .
4396                         '</pre>';
4397         }
4398
4399         /**
4400          * Renders an image gallery from a text with one line per image.
4401          * text labels may be given by using |-style alternative text. E.g.
4402          *   Image:one.jpg|The number "1"
4403          *   Image:tree.jpg|A tree
4404          * given as text will return the HTML of a gallery with two images,
4405          * labeled 'The number "1"' and
4406          * 'A tree'.
4407          */
4408         function renderImageGallery( $text, $params ) {
4409                 $ig = new ImageGallery();
4410                 $ig->setContextTitle( $this->mTitle );
4411                 $ig->setShowBytes( false );
4412                 $ig->setShowFilename( false );
4413                 $ig->setParser( $this );
4414                 $ig->setHideBadImages();
4415                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4416                 $ig->useSkin( $this->mOptions->getSkin() );
4417                 $ig->mRevisionId = $this->mRevisionId;
4418
4419                 if( isset( $params['caption'] ) ) {
4420                         $caption = $params['caption'];
4421                         $caption = htmlspecialchars( $caption );
4422                         $caption = $this->replaceInternalLinks( $caption );
4423                         $ig->setCaptionHtml( $caption );
4424                 }
4425                 if( isset( $params['perrow'] ) ) {
4426                         $ig->setPerRow( $params['perrow'] );
4427                 }
4428                 if( isset( $params['widths'] ) ) {
4429                         $ig->setWidths( $params['widths'] );
4430                 }
4431                 if( isset( $params['heights'] ) ) {
4432                         $ig->setHeights( $params['heights'] );
4433                 }
4434
4435                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4436
4437                 $lines = explode( "\n", $text );
4438                 foreach ( $lines as $line ) {
4439                         # match lines like these:
4440                         # Image:someimage.jpg|This is some image
4441                         $matches = array();
4442                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4443                         # Skip empty lines
4444                         if ( count( $matches ) == 0 ) {
4445                                 continue;
4446                         }
4447                         $tp = Title::newFromText( $matches[1] );
4448                         $nt =& $tp;
4449                         if( is_null( $nt ) ) {
4450                                 # Bogus title. Ignore these so we don't bomb out later.
4451                                 continue;
4452                         }
4453                         if ( isset( $matches[3] ) ) {
4454                                 $label = $matches[3];
4455                         } else {
4456                                 $label = '';
4457                         }
4458
4459                         $pout = $this->parse( $label,
4460                                 $this->mTitle,
4461                                 $this->mOptions,
4462                                 false, // Strip whitespace...?
4463                                 false  // Don't clear state!
4464                         );
4465                         $html = $pout->getText();
4466
4467                         $ig->add( $nt, $html );
4468
4469                         # Only add real images (bug #5586)
4470                         if ( $nt->getNamespace() == NS_IMAGE ) {
4471                                 $this->mOutput->addImage( $nt->getDBkey() );
4472                         }
4473                 }
4474                 return $ig->toHTML();
4475         }
4476
4477         function getImageParams( $handler ) {
4478                 if ( $handler ) {
4479                         $handlerClass = get_class( $handler );
4480                 } else {
4481                         $handlerClass = '';
4482                 }
4483                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4484                         // Initialise static lists
4485                         static $internalParamNames = array(
4486                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4487                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4488                                         'bottom', 'text-bottom' ),
4489                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4490                                         'upright', 'border' ),
4491                         );
4492                         static $internalParamMap;
4493                         if ( !$internalParamMap ) {
4494                                 $internalParamMap = array();
4495                                 foreach ( $internalParamNames as $type => $names ) {
4496                                         foreach ( $names as $name ) {
4497                                                 $magicName = str_replace( '-', '_', "img_$name" );
4498                                                 $internalParamMap[$magicName] = array( $type, $name );
4499                                         }
4500                                 }
4501                         }
4502
4503                         // Add handler params
4504                         $paramMap = $internalParamMap;
4505                         if ( $handler ) {
4506                                 $handlerParamMap = $handler->getParamMap();
4507                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4508                                         $paramMap[$magic] = array( 'handler', $paramName );
4509                                 }
4510                         }
4511                         $this->mImageParams[$handlerClass] = $paramMap;
4512                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4513                 }
4514                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4515         }
4516
4517         /**
4518          * Parse image options text and use it to make an image
4519          */
4520         function makeImage( $title, $options ) {
4521                 # @TODO: let the MediaHandler specify its transform parameters
4522                 #
4523                 # Check if the options text is of the form "options|alt text"
4524                 # Options are:
4525                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4526                 #  * left               no resizing, just left align. label is used for alt= only
4527                 #  * right              same, but right aligned
4528                 #  * none               same, but not aligned
4529                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4530                 #  * center             center the image
4531                 #  * framed             Keep original image size, no magnify-button.
4532                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4533                 #  * upright            reduce width for upright images, rounded to full __0 px
4534                 #  * border             draw a 1px border around the image
4535                 # vertical-align values (no % or length right now):
4536                 #  * baseline
4537                 #  * sub
4538                 #  * super
4539                 #  * top
4540                 #  * text-top
4541                 #  * middle
4542                 #  * bottom
4543                 #  * text-bottom
4544
4545                 $parts = array_map( 'trim', explode( '|', $options) );
4546                 $sk = $this->mOptions->getSkin();
4547
4548                 # Give extensions a chance to select the file revision for us
4549                 $skip = $time = false;
4550                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time ) );
4551
4552                 if ( $skip ) {
4553                         return $sk->makeLinkObj( $title );
4554                 }
4555
4556                 # Get parameter map
4557                 $file = wfFindFile( $title, $time );
4558                 $handler = $file ? $file->getHandler() : false;
4559
4560                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4561
4562                 # Process the input parameters
4563                 $caption = '';
4564                 $params = array( 'frame' => array(), 'handler' => array(),
4565                         'horizAlign' => array(), 'vertAlign' => array() );
4566                 foreach( $parts as $part ) {
4567                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4568                         if ( isset( $paramMap[$magicName] ) ) {
4569                                 list( $type, $paramName ) = $paramMap[$magicName];
4570                                 $params[$type][$paramName] = $value;
4571
4572                                 // Special case; width and height come in one variable together
4573                                 if( $type == 'handler' && $paramName == 'width' ) {
4574                                         $m = array();
4575                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $value, $m ) ) {
4576                                                 $params[$type]['width'] = intval( $m[1] );
4577                                                 $params[$type]['height'] = intval( $m[2] );
4578                                         } else {
4579                                                 $params[$type]['width'] = intval( $value );
4580                                         }
4581                                 }
4582                         } else {
4583                                 $caption = $part;
4584                         }
4585                 }
4586
4587                 # Process alignment parameters
4588                 if ( $params['horizAlign'] ) {
4589                         $params['frame']['align'] = key( $params['horizAlign'] );
4590                 }
4591                 if ( $params['vertAlign'] ) {
4592                         $params['frame']['valign'] = key( $params['vertAlign'] );
4593                 }
4594
4595                 # Validate the handler parameters
4596                 if ( $handler ) {
4597                         foreach ( $params['handler'] as $name => $value ) {
4598                                 if ( !$handler->validateParam( $name, $value ) ) {
4599                                         unset( $params['handler'][$name] );
4600                                 }
4601                         }
4602                 }
4603
4604                 # Strip bad stuff out of the alt text
4605                 $alt = $this->replaceLinkHoldersText( $caption );
4606
4607                 # make sure there are no placeholders in thumbnail attributes
4608                 # that are later expanded to html- so expand them now and
4609                 # remove the tags
4610                 $alt = $this->mStripState->unstripBoth( $alt );
4611                 $alt = Sanitizer::stripAllTags( $alt );
4612
4613                 $params['frame']['alt'] = $alt;
4614                 $params['frame']['caption'] = $caption;
4615
4616                 # Linker does the rest
4617                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'] );
4618
4619                 # Give the handler a chance to modify the parser object
4620                 if ( $handler ) {
4621                         $handler->parserTransformHook( $this, $file );
4622                 }
4623
4624                 return $ret;
4625         }
4626
4627         /**
4628          * Set a flag in the output object indicating that the content is dynamic and
4629          * shouldn't be cached.
4630          */
4631         function disableCache() {
4632                 wfDebug( "Parser output marked as uncacheable.\n" );
4633                 $this->mOutput->mCacheTime = -1;
4634         }
4635
4636         /**#@+
4637          * Callback from the Sanitizer for expanding items found in HTML attribute
4638          * values, so they can be safely tested and escaped.
4639          * @param string $text
4640          * @param array $args
4641          * @return string
4642          * @private
4643          */
4644         function attributeStripCallback( &$text, $args ) {
4645                 $text = $this->replaceVariables( $text, $args );
4646                 $text = $this->mStripState->unstripBoth( $text );
4647                 return $text;
4648         }
4649
4650         /**#@-*/
4651
4652         /**#@+
4653          * Accessor/mutator
4654          */
4655         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4656         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4657         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4658         /**#@-*/
4659
4660         /**#@+
4661          * Accessor
4662          */
4663         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4664         /**#@-*/
4665
4666
4667         /**
4668          * Break wikitext input into sections, and either pull or replace
4669          * some particular section's text.
4670          *
4671          * External callers should use the getSection and replaceSection methods.
4672          *
4673          * @param $text Page wikitext
4674          * @param $section Numbered section. 0 pulls the text before the first
4675          *                 heading; other numbers will pull the given section
4676          *                 along with its lower-level subsections.
4677          * @param $mode One of "get" or "replace"
4678          * @param $newtext Replacement text for section data.
4679          * @return string for "get", the extracted section text.
4680          *                for "replace", the whole page with the section replaced.
4681          */
4682         private function extractSections( $text, $section, $mode, $newtext='' ) {
4683                 # I.... _hope_ this is right.
4684                 # Otherwise, sometimes we don't have things initialized properly.
4685                 $this->clearState();
4686
4687                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4688                 # comments to be stripped as well)
4689                 $stripState = new StripState;
4690
4691                 $oldOutputType = $this->mOutputType;
4692                 $oldOptions = $this->mOptions;
4693                 $this->mOptions = new ParserOptions();
4694                 $this->setOutputType( OT_WIKI );
4695
4696                 $striptext = $this->strip( $text, $stripState, true );
4697
4698                 $this->setOutputType( $oldOutputType );
4699                 $this->mOptions = $oldOptions;
4700
4701                 # now that we can be sure that no pseudo-sections are in the source,
4702                 # split it up by section
4703                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4704                 $comment = "(?:$uniq-!--.*?QINU\x07)";
4705                 $secs = preg_split(
4706                         "/
4707                         (
4708                                 ^
4709                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4710                                 (=+) # Should this be limited to 6?
4711                                 .+?  # Section title...
4712                                 \\2  # Ending = count must match start
4713                                 (?:$comment|<\/?noinclude>|[ \\t]+)* # Trailing whitespace ok
4714                                 $
4715                         |
4716                                 <h([1-6])\b.*?>
4717                                 .*?
4718                                 <\/h\\3\s*>
4719                         )
4720                         /mix",
4721                         $striptext, -1,
4722                         PREG_SPLIT_DELIM_CAPTURE);
4723
4724                 if( $mode == "get" ) {
4725                         if( $section == 0 ) {
4726                                 // "Section 0" returns the content before any other section.
4727                                 $rv = $secs[0];
4728                         } else {
4729                                 //track missing section, will replace if found.
4730                                 $rv = $newtext;
4731                         }
4732                 } elseif( $mode == "replace" ) {
4733                         if( $section == 0 ) {
4734                                 $rv = $newtext . "\n\n";
4735                                 $remainder = true;
4736                         } else {
4737                                 $rv = $secs[0];
4738                                 $remainder = false;
4739                         }
4740                 }
4741                 $count = 0;
4742                 $sectionLevel = 0;
4743                 for( $index = 1; $index < count( $secs ); ) {
4744                         $headerLine = $secs[$index++];
4745                         if( $secs[$index] ) {
4746                                 // A wiki header
4747                                 $headerLevel = strlen( $secs[$index++] );
4748                         } else {
4749                                 // An HTML header
4750                                 $index++;
4751                                 $headerLevel = intval( $secs[$index++] );
4752                         }
4753                         $content = $secs[$index++];
4754
4755                         $count++;
4756                         if( $mode == "get" ) {
4757                                 if( $count == $section ) {
4758                                         $rv = $headerLine . $content;
4759                                         $sectionLevel = $headerLevel;
4760                                 } elseif( $count > $section ) {
4761                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4762                                                 $rv .= $headerLine . $content;
4763                                         } else {
4764                                                 // Broke out to a higher-level section
4765                                                 break;
4766                                         }
4767                                 }
4768                         } elseif( $mode == "replace" ) {
4769                                 if( $count < $section ) {
4770                                         $rv .= $headerLine . $content;
4771                                 } elseif( $count == $section ) {
4772                                         $rv .= $newtext . "\n\n";
4773                                         $sectionLevel = $headerLevel;
4774                                 } elseif( $count > $section ) {
4775                                         if( $headerLevel <= $sectionLevel ) {
4776                                                 // Passed the section's sub-parts.
4777                                                 $remainder = true;
4778                                         }
4779                                         if( $remainder ) {
4780                                                 $rv .= $headerLine . $content;
4781                                         }
4782                                 }
4783                         }
4784                 }
4785                 if (is_string($rv))
4786                         # reinsert stripped tags
4787                         $rv = trim( $stripState->unstripBoth( $rv ) );
4788
4789                 return $rv;
4790         }
4791
4792         /**
4793          * This function returns the text of a section, specified by a number ($section).
4794          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4795          * the first section before any such heading (section 0).
4796          *
4797          * If a section contains subsections, these are also returned.
4798          *
4799          * @param $text String: text to look in
4800          * @param $section Integer: section number
4801          * @param $deftext: default to return if section is not found
4802          * @return string text of the requested section
4803          */
4804         public function getSection( $text, $section, $deftext='' ) {
4805                 return $this->extractSections( $text, $section, "get", $deftext );
4806         }
4807
4808         public function replaceSection( $oldtext, $section, $text ) {
4809                 return $this->extractSections( $oldtext, $section, "replace", $text );
4810         }
4811
4812         /**
4813          * Get the timestamp associated with the current revision, adjusted for
4814          * the default server-local timestamp
4815          */
4816         function getRevisionTimestamp() {
4817                 if ( is_null( $this->mRevisionTimestamp ) ) {
4818                         wfProfileIn( __METHOD__ );
4819                         global $wgContLang;
4820                         $dbr = wfGetDB( DB_SLAVE );
4821                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4822                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4823
4824                         // Normalize timestamp to internal MW format for timezone processing.
4825                         // This has the added side-effect of replacing a null value with
4826                         // the current time, which gives us more sensible behavior for
4827                         // previews.
4828                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4829
4830                         // The cryptic '' timezone parameter tells to use the site-default
4831                         // timezone offset instead of the user settings.
4832                         //
4833                         // Since this value will be saved into the parser cache, served
4834                         // to other users, and potentially even used inside links and such,
4835                         // it needs to be consistent for all visitors.
4836                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4837
4838                         wfProfileOut( __METHOD__ );
4839                 }
4840                 return $this->mRevisionTimestamp;
4841         }
4842
4843         /**
4844          * Mutator for $mDefaultSort
4845          *
4846          * @param $sort New value
4847          */
4848         public function setDefaultSort( $sort ) {
4849                 $this->mDefaultSort = $sort;
4850         }
4851
4852         /**
4853          * Accessor for $mDefaultSort
4854          * Will use the title/prefixed title if none is set
4855          *
4856          * @return string
4857          */
4858         public function getDefaultSort() {
4859                 if( $this->mDefaultSort !== false ) {
4860                         return $this->mDefaultSort;
4861                 } else {
4862                         return $this->mTitle->getNamespace() == NS_CATEGORY
4863                                         ? $this->mTitle->getText()
4864                                         : $this->mTitle->getPrefixedText();
4865                 }
4866         }
4867
4868         /**
4869          * Try to guess the section anchor name based on a wikitext fragment
4870          * presumably extracted from a heading, for example "Header" from
4871          * "== Header ==".
4872          */
4873         public function guessSectionNameFromWikiText( $text ) {
4874                 # Strip out wikitext links(they break the anchor)
4875                 $text = $this->stripSectionName( $text );
4876                 $headline = Sanitizer::decodeCharReferences( $text );
4877                 # strip out HTML
4878                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4879                 $headline = trim( $headline );
4880                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4881                 $replacearray = array(
4882                         '%3A' => ':',
4883                         '%' => '.'
4884                 );
4885                 return str_replace(
4886                         array_keys( $replacearray ),
4887                         array_values( $replacearray ),
4888                         $sectionanchor );
4889         }
4890
4891         /**
4892          * Strips a text string of wikitext for use in a section anchor
4893          *
4894          * Accepts a text string and then removes all wikitext from the
4895          * string and leaves only the resultant text (i.e. the result of
4896          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4897          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4898          * to create valid section anchors by mimicing the output of the
4899          * parser when headings are parsed.
4900          *
4901          * @param $text string Text string to be stripped of wikitext
4902          * for use in a Section anchor
4903          * @return Filtered text string
4904          */
4905         public function stripSectionName( $text ) {
4906                 # Strip internal link markup
4907                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4908                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4909
4910                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4911                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4912                 # on how many empty links there are on the page - need to figure that out.
4913                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4914
4915                 # Parse wikitext quotes (italics & bold)
4916                 $text = $this->doQuotes($text);
4917
4918                 # Strip HTML tags
4919                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4920                 return $text;
4921         }
4922
4923         /**
4924          * strip/replaceVariables/unstrip for preprocessor regression testing
4925          */
4926         function srvus( $text ) {
4927                 $text = $this->strip( $text, $this->mStripState );
4928                 $text = Sanitizer::removeHTMLtags( $text );
4929                 $text = $this->replaceVariables( $text );
4930                 $text = preg_replace( '/<!--MWTEMPLATESECTION.*?-->/', '', $text );
4931                 $text = $this->mStripState->unstripBoth( $text );
4932                 return $text;
4933         }
4934 }
4935