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         // Allowed values for $this->mOutputType
  34         // Parameter to startExternalParse().
  35         const OT_HTML = 1;
  36         const OT_WIKI = 2;
  37         const OT_PREPROCESS = 3;
  38         const OT_MSG = 4;
  39
  40         /**#@+
  41          * @private
  42          */
  43         # Persistent:
  44         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  45                 $mImageParams, $mImageParamsMagicArray, $mExtLinkBracketedRegex;
  46
  47         # Cleared with clearState():
  48         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
  49         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
  50         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
  51         var $mIncludeSizes, $mDefaultSort;
  52         var $mTemplates,        // cache of already loaded templates, avoids
  53                                 // multiple SQL queries for the same string
  54             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
  55                                 // in this path. Used for loop detection.
  56
  57         # Temporary
  58         # These are variables reset at least once per parse regardless of $clearState
  59         var $mOptions,      // ParserOptions object
  60                 $mTitle,        // Title context, used for self-link rendering and similar things
  61                 $mOutputType,   // Output type, one of the OT_xxx constants
  62                 $ot,            // Shortcut alias, see setOutputType()
  63                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
  64                 $mRevisionTimestamp, // The timestamp of the specified revision ID
  65                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
  66
  67         /**#@-*/
  68
  69         /**
  70          * Constructor
  71          *
  72          * @public
  73          */
  74         function __construct( $conf = array() ) {
  75                 $this->mTagHooks = array();
  76                 $this->mTransparentTagHooks = array();
  77                 $this->mFunctionHooks = array();
  78                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
  79                 $this->mFirstCall = true;
  80                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
  81                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
  82         }
  83
  84         /**
  85          * Do various kinds of initialisation on the first call of the parser
  86          */
  87         function firstCallInit() {
  88                 if ( !$this->mFirstCall ) {
  89                         return;
  90                 }
  91                 $this->mFirstCall = false;
  92
  93                 wfProfileIn( __METHOD__ );
  94                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  95
  96                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
  97
  98                 # Syntax for arguments (see self::setFunctionHook):
  99                 #  "name for lookup in localized magic words array",
 100                 #  function callback,
 101                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}
 102                 #    instead of {{#int:...}})
 103                 $this->setFunctionHook( 'int',              array( 'CoreParserFunctions', 'intFunction'      ), SFH_NO_HASH );
 104                 $this->setFunctionHook( 'ns',               array( 'CoreParserFunctions', 'ns'               ), SFH_NO_HASH );
 105                 $this->setFunctionHook( 'urlencode',        array( 'CoreParserFunctions', 'urlencode'        ), SFH_NO_HASH );
 106                 $this->setFunctionHook( 'lcfirst',          array( 'CoreParserFunctions', 'lcfirst'          ), SFH_NO_HASH );
 107                 $this->setFunctionHook( 'ucfirst',          array( 'CoreParserFunctions', 'ucfirst'          ), SFH_NO_HASH );
 108                 $this->setFunctionHook( 'lc',               array( 'CoreParserFunctions', 'lc'               ), SFH_NO_HASH );
 109                 $this->setFunctionHook( 'uc',               array( 'CoreParserFunctions', 'uc'               ), SFH_NO_HASH );
 110                 $this->setFunctionHook( 'localurl',         array( 'CoreParserFunctions', 'localurl'         ), SFH_NO_HASH );
 111                 $this->setFunctionHook( 'localurle',        array( 'CoreParserFunctions', 'localurle'        ), SFH_NO_HASH );
 112                 $this->setFunctionHook( 'fullurl',          array( 'CoreParserFunctions', 'fullurl'          ), SFH_NO_HASH );
 113                 $this->setFunctionHook( 'fullurle',         array( 'CoreParserFunctions', 'fullurle'         ), SFH_NO_HASH );
 114                 $this->setFunctionHook( 'formatnum',        array( 'CoreParserFunctions', 'formatnum'        ), SFH_NO_HASH );
 115                 $this->setFunctionHook( 'grammar',          array( 'CoreParserFunctions', 'grammar'          ), SFH_NO_HASH );
 116                 $this->setFunctionHook( 'plural',           array( 'CoreParserFunctions', 'plural'           ), SFH_NO_HASH );
 117                 $this->setFunctionHook( 'numberofpages',    array( 'CoreParserFunctions', 'numberofpages'    ), SFH_NO_HASH );
 118                 $this->setFunctionHook( 'numberofusers',    array( 'CoreParserFunctions', 'numberofusers'    ), SFH_NO_HASH );
 119                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 120                 $this->setFunctionHook( 'numberoffiles',    array( 'CoreParserFunctions', 'numberoffiles'    ), SFH_NO_HASH );
 121                 $this->setFunctionHook( 'numberofadmins',   array( 'CoreParserFunctions', 'numberofadmins'   ), SFH_NO_HASH );
 122                 $this->setFunctionHook( 'numberofedits',    array( 'CoreParserFunctions', 'numberofedits'    ), SFH_NO_HASH );
 123                 $this->setFunctionHook( 'language',         array( 'CoreParserFunctions', 'language'         ), SFH_NO_HASH );
 124                 $this->setFunctionHook( 'padleft',          array( 'CoreParserFunctions', 'padleft'          ), SFH_NO_HASH );
 125                 $this->setFunctionHook( 'padright',         array( 'CoreParserFunctions', 'padright'         ), SFH_NO_HASH );
 126                 $this->setFunctionHook( 'anchorencode',     array( 'CoreParserFunctions', 'anchorencode'     ), SFH_NO_HASH );
 127                 $this->setFunctionHook( 'special',          array( 'CoreParserFunctions', 'special'          ) );
 128                 $this->setFunctionHook( 'defaultsort',      array( 'CoreParserFunctions', 'defaultsort'      ), SFH_NO_HASH );
 129                 $this->setFunctionHook( 'filepath',         array( 'CoreParserFunctions', 'filepath'         ), SFH_NO_HASH );
 130
 131                 if ( $wgAllowDisplayTitle ) {
 132                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 133                 }
 134                 if ( $wgAllowSlowParserFunctions ) {
 135                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 136                 }
 137
 138                 $this->initialiseVariables();
 139
 140                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 141                 wfProfileOut( __METHOD__ );
 142         }
 143
 144         /**
 145          * Clear Parser state
 146          *
 147          * @private
 148          */
 149         function clearState() {
 150                 wfProfileIn( __METHOD__ );
 151                 if ( $this->mFirstCall ) {
 152                         $this->firstCallInit();
 153                 }
 154                 $this->mOutput = new ParserOutput;
 155                 $this->mAutonumber = 0;
 156                 $this->mLastSection = '';
 157                 $this->mDTopen = false;
 158                 $this->mIncludeCount = array();
 159                 $this->mStripState = new StripState;
 160                 $this->mArgStack = array();
 161                 $this->mInPre = false;
 162                 $this->mInterwikiLinkHolders = array(
 163                         'texts' => array(),
 164                         'titles' => array()
 165                 );
 166                 $this->mLinkHolders = array(
 167                         'namespaces' => array(),
 168                         'dbkeys' => array(),
 169                         'queries' => array(),
 170                         'texts' => array(),
 171                         'titles' => array()
 172                 );
 173                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 174
 175                 /**
 176                  * Prefix for temporary replacement strings for the multipass parser.
 177                  * \x07 should never appear in input as it's disallowed in XML.
 178                  * Using it at the front also gives us a little extra robustness
 179                  * since it shouldn't match when butted up against identifier-like
 180                  * string constructs.
 181                  */
 182                 $this->mUniqPrefix = "\x07UNIQ" . self::getRandomString();
 183
 184                 # Clear these on every parse, bug 4549
 185                 $this->mTemplates = array();
 186                 $this->mTemplatePath = array();
 187
 188                 $this->mShowToc = true;
 189                 $this->mForceTocPosition = false;
 190                 $this->mIncludeSizes = array(
 191                         'pre-expand' => 0,
 192                         'post-expand' => 0,
 193                         'arg' => 0
 194                 );
 195                 $this->mDefaultSort = false;
 196
 197                 wfRunHooks( 'ParserClearState', array( &$this ) );
 198                 wfProfileOut( __METHOD__ );
 199         }
 200
 201         function setOutputType( $ot ) {
 202                 $this->mOutputType = $ot;
 203                 // Shortcut alias
 204                 $this->ot = array(
 205                         'html' => $ot == self::OT_HTML,
 206                         'wiki' => $ot == self::OT_WIKI,
 207                         'msg' => $ot == self::OT_MSG,
 208                         'pre' => $ot == self::OT_PREPROCESS,
 209                 );
 210         }
 211
 212         /**
 213          * Accessor for mUniqPrefix.
 214          *
 215          * @public
 216          */
 217         function uniqPrefix() {
 218                 return $this->mUniqPrefix;
 219         }
 220
 221         /**
 222          * Convert wikitext to HTML
 223          * Do not call this function recursively.
 224          *
 225          * @param string $text Text we want to parse
 226          * @param Title &$title A title object
 227          * @param array $options
 228          * @param boolean $linestart
 229          * @param boolean $clearState
 230          * @param int $revid number to pass in {{REVISIONID}}
 231          * @return ParserOutput a ParserOutput
 232          */
 233         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 234                 /**
 235                  * First pass--just handle <nowiki> sections, pass the rest off
 236                  * to internalParse() which does all the real work.
 237                  */
 238
 239                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 240                 $fname = 'Parser::parse-' . wfGetCaller();
 241                 wfProfileIn( __METHOD__ );
 242                 wfProfileIn( $fname );
 243
 244                 if ( $clearState ) {
 245                         $this->clearState();
 246                 }
 247
 248                 $this->mOptions = $options;
 249                 $this->mTitle =& $title;
 250                 $oldRevisionId = $this->mRevisionId;
 251                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 252                 if( $revid !== null ) {
 253                         $this->mRevisionId = $revid;
 254                         $this->mRevisionTimestamp = null;
 255                 }
 256                 $this->setOutputType( self::OT_HTML );
 257                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 258                 $text = $this->strip( $text, $this->mStripState );
 259                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 260                 $text = $this->internalParse( $text );
 261                 $text = $this->mStripState->unstripGeneral( $text );
 262
 263                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 264                 $fixtags = array(
 265                         # french spaces, last one Guillemet-left
 266                         # only if there is something before the space
 267                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 268                         # french spaces, Guillemet-right
 269                         '/(\\302\\253) /' => '\\1&nbsp;',
 270                 );
 271                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 272
 273                 # only once and last
 274                 $text = $this->doBlockLevels( $text, $linestart );
 275
 276                 $this->replaceLinkHolders( $text );
 277
 278                 # the position of the parserConvert() call should not be changed. it
 279                 # assumes that the links are all replaced and the only thing left
 280                 # is the <nowiki> mark.
 281                 # Side-effects: this calls $this->mOutput->setTitleText()
 282                 $text = $wgContLang->parserConvert( $text, $this );
 283
 284                 $text = $this->mStripState->unstripNoWiki( $text );
 285
 286                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 287
 288 //!JF Move to its own function
 289
 290                 $uniq_prefix = $this->mUniqPrefix;
 291                 $matches = array();
 292                 $elements = array_keys( $this->mTransparentTagHooks );
 293                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 294
 295                 foreach( $matches as $marker => $data ) {
 296                         list( $element, $content, $params, $tag ) = $data;
 297                         $tagName = strtolower( $element );
 298                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 299                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 300                                         array( $content, $params, $this ) );
 301                         } else {
 302                                 $output = $tag;
 303                         }
 304                         $this->mStripState->general->setPair( $marker, $output );
 305                 }
 306                 $text = $this->mStripState->unstripGeneral( $text );
 307
 308                 $text = Sanitizer::normalizeCharReferences( $text );
 309
 310                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 311                         $text = self::tidy($text);
 312                 } else {
 313                         # attempt to sanitize at least some nesting problems
 314                         # (bug #2702 and quite a few others)
 315                         $tidyregs = array(
 316                                 # ''Something [http://www.cool.com cool''] -->
 317                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 318                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 319                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 320                                 # fix up an anchor inside another anchor, only
 321                                 # at least for a single single nested link (bug 3695)
 322                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 323                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 324                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 325                                 # contains a div, so fix it up here; replace
 326                                 # div with escaped text
 327                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 328                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 329                                 # remove empty italic or bold tag pairs, some
 330                                 # introduced by rules above
 331                                 '/<([bi])><\/\\1>/' => '',
 332                         );
 333
 334                         $text = preg_replace(
 335                                 array_keys( $tidyregs ),
 336                                 array_values( $tidyregs ),
 337                                 $text );
 338                 }
 339
 340                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 341
 342                 # Information on include size limits, for the benefit of users who try to skirt them
 343                 if ( $this->mOptions->getEnableLimitReport() ) {
 344                         $max = $this->mOptions->getMaxIncludeSize();
 345                         $limitReport =
 346                                 "Pre-expand include size: {$this->mIncludeSizes['pre-expand']}/$max bytes\n" .
 347                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 348                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n";
 349                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 350                         $text .= "<!-- \n$limitReport-->\n";
 351                 }
 352                 $this->mOutput->setText( $text );
 353                 $this->mRevisionId = $oldRevisionId;
 354                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 355                 wfProfileOut( $fname );
 356                 wfProfileOut( __METHOD__ );
 357
 358                 return $this->mOutput;
 359         }
 360
 361         /**
 362          * Recursive parser entry point that can be called from an extension tag
 363          * hook.
 364          */
 365         function recursiveTagParse( $text ) {
 366                 wfProfileIn( __METHOD__ );
 367                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 368                 $text = $this->strip( $text, $this->mStripState );
 369                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 370                 $text = $this->internalParse( $text );
 371                 wfProfileOut( __METHOD__ );
 372                 return $text;
 373         }
 374
 375         /**
 376          * Expand templates and variables in the text, producing valid, static wikitext.
 377          * Also removes comments.
 378          */
 379         function preprocess( $text, $title, $options, $revid = null ) {
 380                 wfProfileIn( __METHOD__ );
 381                 $this->clearState();
 382                 $this->setOutputType( self::OT_PREPROCESS );
 383                 $this->mOptions = $options;
 384                 $this->mTitle = $title;
 385                 if( $revid !== null ) {
 386                         $this->mRevisionId = $revid;
 387                 }
 388                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 389                 $text = $this->strip( $text, $this->mStripState );
 390                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 391                 if ( $this->mOptions->getRemoveComments() ) {
 392                         $text = Sanitizer::removeHTMLcomments( $text );
 393                 }
 394                 $text = $this->replaceVariables( $text );
 395                 $text = $this->mStripState->unstripBoth( $text );
 396                 wfProfileOut( __METHOD__ );
 397                 return $text;
 398         }
 399
 400         /**
 401          * Get a random string
 402          *
 403          * @private
 404          * @static
 405          */
 406         function getRandomString() {
 407                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 408         }
 409
 410         function &getTitle() { return $this->mTitle; }
 411         function getOptions() { return $this->mOptions; }
 412
 413         function getFunctionLang() {
 414                 global $wgLang, $wgContLang;
 415                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 416         }
 417
 418         /**
 419          * Replaces all occurrences of HTML-style comments and the given tags
 420          * in the text with a random marker and returns teh next text. The output
 421          * parameter $matches will be an associative array filled with data in
 422          * the form:
 423          *   'UNIQ-xxxxx' => array(
 424          *     'element',
 425          *     'tag content',
 426          *     array( 'param' => 'x' ),
 427          *     '<element param="x">tag content</element>' ) )
 428          *
 429          * @param $elements list of element names. Comments are always extracted.
 430          * @param $text Source text string.
 431          * @param $uniq_prefix
 432          *
 433          * @public
 434          * @static
 435          */
 436         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 437                 static $n = 1;
 438                 $stripped = '';
 439                 $matches = array();
 440
 441                 $taglist = implode( '|', $elements );
 442                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 443
 444                 while ( '' != $text ) {
 445                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 446                         $stripped .= $p[0];
 447                         if( count( $p ) < 5 ) {
 448                                 break;
 449                         }
 450                         if( count( $p ) > 5 ) {
 451                                 // comment
 452                                 $element    = $p[4];
 453                                 $attributes = '';
 454                                 $close      = '';
 455                                 $inside     = $p[5];
 456                         } else {
 457                                 // tag
 458                                 $element    = $p[1];
 459                                 $attributes = $p[2];
 460                                 $close      = $p[3];
 461                                 $inside     = $p[4];
 462                         }
 463
 464                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . "-QINU\x07";
 465                         $stripped .= $marker;
 466
 467                         if ( $close === '/>' ) {
 468                                 // Empty element tag, <tag />
 469                                 $content = null;
 470                                 $text = $inside;
 471                                 $tail = null;
 472                         } else {
 473                                 if( $element == '!--' ) {
 474                                         $end = '/(-->)/';
 475                                 } else {
 476                                         $end = "/(<\\/$element\\s*>)/i";
 477                                 }
 478                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 479                                 $content = $q[0];
 480                                 if( count( $q ) < 3 ) {
 481                                         # No end tag -- let it run out to the end of the text.
 482                                         $tail = '';
 483                                         $text = '';
 484                                 } else {
 485                                         $tail = $q[1];
 486                                         $text = $q[2];
 487                                 }
 488                         }
 489
 490                         $matches[$marker] = array( $element,
 491                                 $content,
 492                                 Sanitizer::decodeTagAttributes( $attributes ),
 493                                 "<$element$attributes$close$content$tail" );
 494                 }
 495                 return $stripped;
 496         }
 497
 498         /**
 499          * Strips and renders nowiki, pre, math, hiero
 500          * If $render is set, performs necessary rendering operations on plugins
 501          * Returns the text, and fills an array with data needed in unstrip()
 502          *
 503          * @param StripState $state
 504          *
 505          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 506          *  will be stripped in addition to other tags. This is important
 507          *  for section editing, where these comments cause confusion when
 508          *  counting the sections in the wikisource
 509          *
 510          * @param array dontstrip contains tags which should not be stripped;
 511          *  used to prevent stipping of <gallery> when saving (fixes bug 2700)
 512          *
 513          * @private
 514          */
 515         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 516                 global $wgContLang;
 517                 wfProfileIn( __METHOD__ );
 518                 $render = ($this->mOutputType == self::OT_HTML);
 519
 520                 $uniq_prefix = $this->mUniqPrefix;
 521                 $commentState = new ReplacementArray;
 522                 $nowikiItems = array();
 523                 $generalItems = array();
 524
 525                 $elements = array_merge(
 526                         array( 'nowiki', 'gallery' ),
 527                         array_keys( $this->mTagHooks ) );
 528                 global $wgRawHtml;
 529                 if( $wgRawHtml ) {
 530                         $elements[] = 'html';
 531                 }
 532                 if( $this->mOptions->getUseTeX() ) {
 533                         $elements[] = 'math';
 534                 }
 535
 536                 # Removing $dontstrip tags from $elements list (currently only 'gallery', fixing bug 2700)
 537                 foreach ( $elements AS $k => $v ) {
 538                         if ( !in_array ( $v , $dontstrip ) ) continue;
 539                         unset ( $elements[$k] );
 540                 }
 541
 542                 $matches = array();
 543                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 544
 545                 foreach( $matches as $marker => $data ) {
 546                         list( $element, $content, $params, $tag ) = $data;
 547                         if( $render ) {
 548                                 $tagName = strtolower( $element );
 549                                 wfProfileIn( __METHOD__."-render-$tagName" );
 550                                 switch( $tagName ) {
 551                                 case '!--':
 552                                         // Comment
 553                                         if( substr( $tag, -3 ) == '-->' ) {
 554                                                 $output = $tag;
 555                                         } else {
 556                                                 // Unclosed comment in input.
 557                                                 // Close it so later stripping can remove it
 558                                                 $output = "$tag-->";
 559                                         }
 560                                         break;
 561                                 case 'html':
 562                                         if( $wgRawHtml ) {
 563                                                 $output = $content;
 564                                                 break;
 565                                         }
 566                                         // Shouldn't happen otherwise. :)
 567                                 case 'nowiki':
 568                                         $output = Xml::escapeTagsOnly( $content );
 569                                         break;
 570                                 case 'math':
 571                                         $output = $wgContLang->armourMath(
 572                                                 MathRenderer::renderMath( $content, $params ) );
 573                                         break;
 574                                 case 'gallery':
 575                                         $output = $this->renderImageGallery( $content, $params );
 576                                         break;
 577                                 default:
 578                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 579                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 580                                                         array( $content, $params, $this ) );
 581                                         } else {
 582                                                 throw new MWException( "Invalid call hook $element" );
 583                                         }
 584                                 }
 585                                 wfProfileOut( __METHOD__."-render-$tagName" );
 586                         } else {
 587                                 // Just stripping tags; keep the source
 588                                 $output = $tag;
 589                         }
 590
 591                         // Unstrip the output, to support recursive strip() calls
 592                         $output = $state->unstripBoth( $output );
 593
 594                         if( !$stripcomments && $element == '!--' ) {
 595                                 $commentState->setPair( $marker, $output );
 596                         } elseif ( $element == 'html' || $element == 'nowiki' ) {
 597                                 $nowikiItems[$marker] = $output;
 598                         } else {
 599                                 $generalItems[$marker] = $output;
 600                         }
 601                 }
 602                 # Add the new items to the state
 603                 # We do this after the loop instead of during it to avoid slowing
 604                 # down the recursive unstrip
 605                 $state->nowiki->mergeArray( $nowikiItems );
 606                 $state->general->mergeArray( $generalItems );
 607
 608                 # Unstrip comments unless explicitly told otherwise.
 609                 # (The comments are always stripped prior to this point, so as to
 610                 # not invoke any extension tags / parser hooks contained within
 611                 # a comment.)
 612                 if ( !$stripcomments ) {
 613                         // Put them all back and forget them
 614                         $text = $commentState->replace( $text );
 615                 }
 616
 617                 wfProfileOut( __METHOD__ );
 618                 return $text;
 619         }
 620
 621         /**
 622          * Restores pre, math, and other extensions removed by strip()
 623          *
 624          * always call unstripNoWiki() after this one
 625          * @private
 626          * @deprecated use $this->mStripState->unstrip()
 627          */
 628         function unstrip( $text, $state ) {
 629                 return $state->unstripGeneral( $text );
 630         }
 631
 632         /**
 633          * Always call this after unstrip() to preserve the order
 634          *
 635          * @private
 636          * @deprecated use $this->mStripState->unstrip()
 637          */
 638         function unstripNoWiki( $text, $state ) {
 639                 return $state->unstripNoWiki( $text );
 640         }
 641
 642         /**
 643          * @deprecated use $this->mStripState->unstripBoth()
 644          */
 645         function unstripForHTML( $text ) {
 646                 return $this->mStripState->unstripBoth( $text );
 647         }
 648
 649         /**
 650          * Add an item to the strip state
 651          * Returns the unique tag which must be inserted into the stripped text
 652          * The tag will be replaced with the original text in unstrip()
 653          *
 654          * @private
 655          */
 656         function insertStripItem( $text, &$state ) {
 657                 $rnd = $this->mUniqPrefix . '-item' . self::getRandomString();
 658                 $state->general->setPair( $rnd, $text );
 659                 return $rnd;
 660         }
 661
 662         /**
 663          * Interface with html tidy, used if $wgUseTidy = true.
 664          * If tidy isn't able to correct the markup, the original will be
 665          * returned in all its glory with a warning comment appended.
 666          *
 667          * Either the external tidy program or the in-process tidy extension
 668          * will be used depending on availability. Override the default
 669          * $wgTidyInternal setting to disable the internal if it's not working.
 670          *
 671          * @param string $text Hideous HTML input
 672          * @return string Corrected HTML output
 673          * @public
 674          * @static
 675          */
 676         function tidy( $text ) {
 677                 global $wgTidyInternal;
 678                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 679 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 680 '<head><title>test</title></head><body>'.$text.'</body></html>';
 681                 if( $wgTidyInternal ) {
 682                         $correctedtext = self::internalTidy( $wrappedtext );
 683                 } else {
 684                         $correctedtext = self::externalTidy( $wrappedtext );
 685                 }
 686                 if( is_null( $correctedtext ) ) {
 687                         wfDebug( "Tidy error detected!\n" );
 688                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 689                 }
 690                 return $correctedtext;
 691         }
 692
 693         /**
 694          * Spawn an external HTML tidy process and get corrected markup back from it.
 695          *
 696          * @private
 697          * @static
 698          */
 699         function externalTidy( $text ) {
 700                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 701                 $fname = 'Parser::externalTidy';
 702                 wfProfileIn( $fname );
 703
 704                 $cleansource = '';
 705                 $opts = ' -utf8';
 706
 707                 $descriptorspec = array(
 708                         0 => array('pipe', 'r'),
 709                         1 => array('pipe', 'w'),
 710                         2 => array('file', wfGetNull(), 'a')
 711                 );
 712                 $pipes = array();
 713                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 714                 if (is_resource($process)) {
 715                         // Theoretically, this style of communication could cause a deadlock
 716                         // here. If the stdout buffer fills up, then writes to stdin could
 717                         // block. This doesn't appear to happen with tidy, because tidy only
 718                         // writes to stdout after it's finished reading from stdin. Search
 719                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 720                         fwrite($pipes[0], $text);
 721                         fclose($pipes[0]);
 722                         while (!feof($pipes[1])) {
 723                                 $cleansource .= fgets($pipes[1], 1024);
 724                         }
 725                         fclose($pipes[1]);
 726                         proc_close($process);
 727                 }
 728
 729                 wfProfileOut( $fname );
 730
 731                 if( $cleansource == '' && $text != '') {
 732                         // Some kind of error happened, so we couldn't get the corrected text.
 733                         // Just give up; we'll use the source text and append a warning.
 734                         return null;
 735                 } else {
 736                         return $cleansource;
 737                 }
 738         }
 739
 740         /**
 741          * Use the HTML tidy PECL extension to use the tidy library in-process,
 742          * saving the overhead of spawning a new process.
 743          *
 744          * 'pear install tidy' should be able to compile the extension module.
 745          *
 746          * @private
 747          * @static
 748          */
 749         function internalTidy( $text ) {
 750                 global $wgTidyConf, $IP;
 751                 $fname = 'Parser::internalTidy';
 752                 wfProfileIn( $fname );
 753
 754                 $tidy = new tidy;
 755                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 756                 $tidy->cleanRepair();
 757                 if( $tidy->getStatus() == 2 ) {
 758                         // 2 is magic number for fatal error
 759                         // http://www.php.net/manual/en/function.tidy-get-status.php
 760                         $cleansource = null;
 761                 } else {
 762                         $cleansource = tidy_get_output( $tidy );
 763                 }
 764                 wfProfileOut( $fname );
 765                 return $cleansource;
 766         }
 767
 768         /**
 769          * parse the wiki syntax used to render tables
 770          *
 771          * @private
 772          */
 773         function doTableStuff ( $text ) {
 774                 $fname = 'Parser::doTableStuff';
 775                 wfProfileIn( $fname );
 776
 777                 $lines = explode ( "\n" , $text );
 778                 $td_history = array (); // Is currently a td tag open?
 779                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 780                 $tr_history = array (); // Is currently a tr tag open?
 781                 $tr_attributes = array (); // history of tr attributes
 782                 $has_opened_tr = array(); // Did this table open a <tr> element?
 783                 $indent_level = 0; // indent level of the table
 784                 foreach ( $lines as $key => $line )
 785                 {
 786                         $line = trim ( $line );
 787
 788                         if( $line == '' ) { // empty line, go to next line
 789                                 continue;
 790                         }
 791                         $first_character = $line{0};
 792                         $matches = array();
 793
 794                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 795                                 // First check if we are starting a new table
 796                                 $indent_level = strlen( $matches[1] );
 797
 798                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 799                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 800
 801                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 802                                 array_push ( $td_history , false );
 803                                 array_push ( $last_tag_history , '' );
 804                                 array_push ( $tr_history , false );
 805                                 array_push ( $tr_attributes , '' );
 806                                 array_push ( $has_opened_tr , false );
 807                         } else if ( count ( $td_history ) == 0 ) {
 808                                 // Don't do any of the following
 809                                 continue;
 810                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 811                                 // We are ending a table
 812                                 $line = '</table>' . substr ( $line , 2 );
 813                                 $last_tag = array_pop ( $last_tag_history );
 814
 815                                 if ( !array_pop ( $has_opened_tr ) ) {
 816                                         $line = "<tr><td></td></tr>{$line}";
 817                                 }
 818
 819                                 if ( array_pop ( $tr_history ) ) {
 820                                         $line = "</tr>{$line}";
 821                                 }
 822
 823                                 if ( array_pop ( $td_history ) ) {
 824                                         $line = "</{$last_tag}>{$line}";
 825                                 }
 826                                 array_pop ( $tr_attributes );
 827                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 828                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 829                                 // Now we have a table row
 830                                 $line = preg_replace( '#^\|-+#', '', $line );
 831
 832                                 // Whats after the tag is now only attributes
 833                                 $attributes = $this->mStripState->unstripBoth( $line );
 834                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 835                                 array_pop ( $tr_attributes );
 836                                 array_push ( $tr_attributes , $attributes );
 837
 838                                 $line = '';
 839                                 $last_tag = array_pop ( $last_tag_history );
 840                                 array_pop ( $has_opened_tr );
 841                                 array_push ( $has_opened_tr , true );
 842
 843                                 if ( array_pop ( $tr_history ) ) {
 844                                         $line = '</tr>';
 845                                 }
 846
 847                                 if ( array_pop ( $td_history ) ) {
 848                                         $line = "</{$last_tag}>{$line}";
 849                                 }
 850
 851                                 $lines[$key] = $line;
 852                                 array_push ( $tr_history , false );
 853                                 array_push ( $td_history , false );
 854                                 array_push ( $last_tag_history , '' );
 855                         }
 856                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 857                                 // This might be cell elements, td, th or captions
 858                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 859                                         $first_character = '+';
 860                                         $line = substr ( $line , 1 );
 861                                 }
 862
 863                                 $line = substr ( $line , 1 );
 864
 865                                 if ( $first_character == '!' ) {
 866                                         $line = str_replace ( '!!' , '||' , $line );
 867                                 }
 868
 869                                 // Split up multiple cells on the same line.
 870                                 // FIXME : This can result in improper nesting of tags processed
 871                                 // by earlier parser steps, but should avoid splitting up eg
 872                                 // attribute values containing literal "||".
 873                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 874
 875                                 $lines[$key] = '';
 876
 877                                 // Loop through each table cell
 878                                 foreach ( $cells as $cell )
 879                                 {
 880                                         $previous = '';
 881                                         if ( $first_character != '+' )
 882                                         {
 883                                                 $tr_after = array_pop ( $tr_attributes );
 884                                                 if ( !array_pop ( $tr_history ) ) {
 885                                                         $previous = "<tr{$tr_after}>\n";
 886                                                 }
 887                                                 array_push ( $tr_history , true );
 888                                                 array_push ( $tr_attributes , '' );
 889                                                 array_pop ( $has_opened_tr );
 890                                                 array_push ( $has_opened_tr , true );
 891                                         }
 892
 893                                         $last_tag = array_pop ( $last_tag_history );
 894
 895                                         if ( array_pop ( $td_history ) ) {
 896                                                 $previous = "</{$last_tag}>{$previous}";
 897                                         }
 898
 899                                         if ( $first_character == '|' ) {
 900                                                 $last_tag = 'td';
 901                                         } else if ( $first_character == '!' ) {
 902                                                 $last_tag = 'th';
 903                                         } else if ( $first_character == '+' ) {
 904                                                 $last_tag = 'caption';
 905                                         } else {
 906                                                 $last_tag = '';
 907                                         }
 908
 909                                         array_push ( $last_tag_history , $last_tag );
 910
 911                                         // A cell could contain both parameters and data
 912                                         $cell_data = explode ( '|' , $cell , 2 );
 913
 914                                         // Bug 553: Note that a '|' inside an invalid link should not
 915                                         // be mistaken as delimiting cell parameters
 916                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 917                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 918                                         } else if ( count ( $cell_data ) == 1 )
 919                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 920                                         else {
 921                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 922                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 923                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 924                                         }
 925
 926                                         $lines[$key] .= $cell;
 927                                         array_push ( $td_history , true );
 928                                 }
 929                         }
 930                 }
 931
 932                 // Closing open td, tr && table
 933                 while ( count ( $td_history ) > 0 )
 934                 {
 935                         if ( array_pop ( $td_history ) ) {
 936                                 $lines[] = '</td>' ;
 937                         }
 938                         if ( array_pop ( $tr_history ) ) {
 939                                 $lines[] = '</tr>' ;
 940                         }
 941                         if ( !array_pop ( $has_opened_tr ) ) {
 942                                 $lines[] = "<tr><td></td></tr>" ;
 943                         }
 944
 945                         $lines[] = '</table>' ;
 946                 }
 947
 948                 $output = implode ( "\n" , $lines ) ;
 949
 950                 // special case: don't return empty table
 951                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 952                         $output = '';
 953                 }
 954
 955                 wfProfileOut( $fname );
 956
 957                 return $output;
 958         }
 959
 960         /**
 961          * Helper function for parse() that transforms wiki markup into
 962          * HTML. Only called for $mOutputType == OT_HTML.
 963          *
 964          * @private
 965          */
 966         function internalParse( $text ) {
 967                 $args = array();
 968                 $isMain = true;
 969                 $fname = 'Parser::internalParse';
 970                 wfProfileIn( $fname );
 971
 972                 # Hook to suspend the parser in this state
 973                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 974                         wfProfileOut( $fname );
 975                         return $text ;
 976                 }
 977
 978                 # Remove <noinclude> tags and <includeonly> sections
 979                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 980                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 981                 $text = StringUtils::delimiterReplace( '<includeonly>', '</includeonly>', '', $text );
 982
 983                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), array(), array_keys( $this->mTransparentTagHooks ) );
 984
 985                 $text = $this->replaceVariables( $text, $args );
 986                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 987
 988                 // Tables need to come after variable replacement for things to work
 989                 // properly; putting them before other transformations should keep
 990                 // exciting things like link expansions from showing up in surprising
 991                 // places.
 992                 $text = $this->doTableStuff( $text );
 993
 994                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 995
 996                 $text = $this->stripToc( $text );
 997                 $this->stripNoGallery( $text );
 998                 $text = $this->doHeadings( $text );
 999                 if($this->mOptions->getUseDynamicDates()) {
1000                         $df =& DateFormatter::getInstance();
1001                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
1002                 }
1003                 $text = $this->doAllQuotes( $text );
1004                 $text = $this->replaceInternalLinks( $text );
1005                 $text = $this->replaceExternalLinks( $text );
1006
1007                 # replaceInternalLinks may sometimes leave behind
1008                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1009                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
1010
1011                 $text = $this->doMagicLinks( $text );
1012                 $text = $this->formatHeadings( $text, $isMain );
1013
1014                 wfProfileOut( $fname );
1015                 return $text;
1016         }
1017
1018         /**
1019          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1020          * magic external links.
1021          *
1022          * @private
1023          */
1024         function &doMagicLinks( &$text ) {
1025                 wfProfileIn( __METHOD__ );
1026                 $text = preg_replace_callback(
1027                         '!(?:                           # Start cases
1028                             <a.*?</a> |                 # Skip link text
1029                             <.*?> |                     # Skip stuff inside HTML elements
1030                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
1031                             ISBN\s+(\b                  # ISBN, capture number as m[2]
1032                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1033                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1034                                      [0-9Xx]                 # check digit
1035                                    \b)
1036                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1037                 wfProfileOut( __METHOD__ );
1038                 return $text;
1039         }
1040
1041         function magicLinkCallback( $m ) {
1042                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1043                         # Skip HTML element
1044                         return $m[0];
1045                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1046                         $isbn = $m[2];
1047                         $num = strtr( $isbn, array(
1048                                 '-' => '',
1049                                 ' ' => '',
1050                                 'x' => 'X',
1051                         ));
1052                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
1053                         $text = '<a href="' .
1054                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
1055                                 "\" class=\"internal\">ISBN $isbn</a>";
1056                 } else {
1057                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1058                                 $keyword = 'RFC';
1059                                 $urlmsg = 'rfcurl';
1060                                 $id = $m[1];
1061                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1062                                 $keyword = 'PMID';
1063                                 $urlmsg = 'pubmedurl';
1064                                 $id = $m[1];
1065                         } else {
1066                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1067                                         substr($m[0], 0, 20 ) . '"' );
1068                         }
1069
1070                         $url = wfMsg( $urlmsg, $id);
1071                         $sk = $this->mOptions->getSkin();
1072                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1073                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1074                 }
1075                 return $text;
1076         }
1077
1078         /**
1079          * Parse headers and return html
1080          *
1081          * @private
1082          */
1083         function doHeadings( $text ) {
1084                 $fname = 'Parser::doHeadings';
1085                 wfProfileIn( $fname );
1086                 for ( $i = 6; $i >= 1; --$i ) {
1087                         $h = str_repeat( '=', $i );
1088                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
1089                           "<h{$i}>\\1</h{$i}>\\2", $text );
1090                 }
1091                 wfProfileOut( $fname );
1092                 return $text;
1093         }
1094
1095         /**
1096          * Replace single quotes with HTML markup
1097          * @private
1098          * @return string the altered text
1099          */
1100         function doAllQuotes( $text ) {
1101                 $fname = 'Parser::doAllQuotes';
1102                 wfProfileIn( $fname );
1103                 $outtext = '';
1104                 $lines = explode( "\n", $text );
1105                 foreach ( $lines as $line ) {
1106                         $outtext .= $this->doQuotes ( $line ) . "\n";
1107                 }
1108                 $outtext = substr($outtext, 0,-1);
1109                 wfProfileOut( $fname );
1110                 return $outtext;
1111         }
1112
1113         /**
1114          * Helper function for doAllQuotes()
1115          */
1116         public function doQuotes( $text ) {
1117                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1118                 if ( count( $arr ) == 1 )
1119                         return $text;
1120                 else
1121                 {
1122                         # First, do some preliminary work. This may shift some apostrophes from
1123                         # being mark-up to being text. It also counts the number of occurrences
1124                         # of bold and italics mark-ups.
1125                         $i = 0;
1126                         $numbold = 0;
1127                         $numitalics = 0;
1128                         foreach ( $arr as $r )
1129                         {
1130                                 if ( ( $i % 2 ) == 1 )
1131                                 {
1132                                         # If there are ever four apostrophes, assume the first is supposed to
1133                                         # be text, and the remaining three constitute mark-up for bold text.
1134                                         if ( strlen( $arr[$i] ) == 4 )
1135                                         {
1136                                                 $arr[$i-1] .= "'";
1137                                                 $arr[$i] = "'''";
1138                                         }
1139                                         # If there are more than 5 apostrophes in a row, assume they're all
1140                                         # text except for the last 5.
1141                                         else if ( strlen( $arr[$i] ) > 5 )
1142                                         {
1143                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1144                                                 $arr[$i] = "'''''";
1145                                         }
1146                                         # Count the number of occurrences of bold and italics mark-ups.
1147                                         # We are not counting sequences of five apostrophes.
1148                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1149                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1150                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1151                                 }
1152                                 $i++;
1153                         }
1154
1155                         # If there is an odd number of both bold and italics, it is likely
1156                         # that one of the bold ones was meant to be an apostrophe followed
1157                         # by italics. Which one we cannot know for certain, but it is more
1158                         # likely to be one that has a single-letter word before it.
1159                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1160                         {
1161                                 $i = 0;
1162                                 $firstsingleletterword = -1;
1163                                 $firstmultiletterword = -1;
1164                                 $firstspace = -1;
1165                                 foreach ( $arr as $r )
1166                                 {
1167                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1168                                         {
1169                                                 $x1 = substr ($arr[$i-1], -1);
1170                                                 $x2 = substr ($arr[$i-1], -2, 1);
1171                                                 if ($x1 == ' ') {
1172                                                         if ($firstspace == -1) $firstspace = $i;
1173                                                 } else if ($x2 == ' ') {
1174                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1175                                                 } else {
1176                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1177                                                 }
1178                                         }
1179                                         $i++;
1180                                 }
1181
1182                                 # If there is a single-letter word, use it!
1183                                 if ($firstsingleletterword > -1)
1184                                 {
1185                                         $arr [ $firstsingleletterword ] = "''";
1186                                         $arr [ $firstsingleletterword-1 ] .= "'";
1187                                 }
1188                                 # If not, but there's a multi-letter word, use that one.
1189                                 else if ($firstmultiletterword > -1)
1190                                 {
1191                                         $arr [ $firstmultiletterword ] = "''";
1192                                         $arr [ $firstmultiletterword-1 ] .= "'";
1193                                 }
1194                                 # ... otherwise use the first one that has neither.
1195                                 # (notice that it is possible for all three to be -1 if, for example,
1196                                 # there is only one pentuple-apostrophe in the line)
1197                                 else if ($firstspace > -1)
1198                                 {
1199                                         $arr [ $firstspace ] = "''";
1200                                         $arr [ $firstspace-1 ] .= "'";
1201                                 }
1202                         }
1203
1204                         # Now let's actually convert our apostrophic mush to HTML!
1205                         $output = '';
1206                         $buffer = '';
1207                         $state = '';
1208                         $i = 0;
1209                         foreach ($arr as $r)
1210                         {
1211                                 if (($i % 2) == 0)
1212                                 {
1213                                         if ($state == 'both')
1214                                                 $buffer .= $r;
1215                                         else
1216                                                 $output .= $r;
1217                                 }
1218                                 else
1219                                 {
1220                                         if (strlen ($r) == 2)
1221                                         {
1222                                                 if ($state == 'i')
1223                                                 { $output .= '</i>'; $state = ''; }
1224                                                 else if ($state == 'bi')
1225                                                 { $output .= '</i>'; $state = 'b'; }
1226                                                 else if ($state == 'ib')
1227                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1228                                                 else if ($state == 'both')
1229                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1230                                                 else # $state can be 'b' or ''
1231                                                 { $output .= '<i>'; $state .= 'i'; }
1232                                         }
1233                                         else if (strlen ($r) == 3)
1234                                         {
1235                                                 if ($state == 'b')
1236                                                 { $output .= '</b>'; $state = ''; }
1237                                                 else if ($state == 'bi')
1238                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1239                                                 else if ($state == 'ib')
1240                                                 { $output .= '</b>'; $state = 'i'; }
1241                                                 else if ($state == 'both')
1242                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1243                                                 else # $state can be 'i' or ''
1244                                                 { $output .= '<b>'; $state .= 'b'; }
1245                                         }
1246                                         else if (strlen ($r) == 5)
1247                                         {
1248                                                 if ($state == 'b')
1249                                                 { $output .= '</b><i>'; $state = 'i'; }
1250                                                 else if ($state == 'i')
1251                                                 { $output .= '</i><b>'; $state = 'b'; }
1252                                                 else if ($state == 'bi')
1253                                                 { $output .= '</i></b>'; $state = ''; }
1254                                                 else if ($state == 'ib')
1255                                                 { $output .= '</b></i>'; $state = ''; }
1256                                                 else if ($state == 'both')
1257                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1258                                                 else # ($state == '')
1259                                                 { $buffer = ''; $state = 'both'; }
1260                                         }
1261                                 }
1262                                 $i++;
1263                         }
1264                         # Now close all remaining tags.  Notice that the order is important.
1265                         if ($state == 'b' || $state == 'ib')
1266                                 $output .= '</b>';
1267                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1268                                 $output .= '</i>';
1269                         if ($state == 'bi')
1270                                 $output .= '</b>';
1271                         # There might be lonely ''''', so make sure we have a buffer
1272                         if ($state == 'both' && $buffer)
1273                                 $output .= '<b><i>'.$buffer.'</i></b>';
1274                         return $output;
1275                 }
1276         }
1277
1278         /**
1279          * Replace external links
1280          *
1281          * Note: this is all very hackish and the order of execution matters a lot.
1282          * Make sure to run maintenance/parserTests.php if you change this code.
1283          *
1284          * @private
1285          */
1286         function replaceExternalLinks( $text ) {
1287                 global $wgContLang;
1288                 $fname = 'Parser::replaceExternalLinks';
1289                 wfProfileIn( $fname );
1290
1291                 $sk = $this->mOptions->getSkin();
1292
1293                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1294
1295                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1296
1297                 $i = 0;
1298                 while ( $i<count( $bits ) ) {
1299                         $url = $bits[$i++];
1300                         $protocol = $bits[$i++];
1301                         $text = $bits[$i++];
1302                         $trail = $bits[$i++];
1303
1304                         # The characters '<' and '>' (which were escaped by
1305                         # removeHTMLtags()) should not be included in
1306                         # URLs, per RFC 2396.
1307                         $m2 = array();
1308                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1309                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1310                                 $url = substr($url, 0, $m2[0][1]);
1311                         }
1312
1313                         # If the link text is an image URL, replace it with an <img> tag
1314                         # This happened by accident in the original parser, but some people used it extensively
1315                         $img = $this->maybeMakeExternalImage( $text );
1316                         if ( $img !== false ) {
1317                                 $text = $img;
1318                         }
1319
1320                         $dtrail = '';
1321
1322                         # Set linktype for CSS - if URL==text, link is essentially free
1323                         $linktype = ($text == $url) ? 'free' : 'text';
1324
1325                         # No link text, e.g. [http://domain.tld/some.link]
1326                         if ( $text == '' ) {
1327                                 # Autonumber if allowed. See bug #5918
1328                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1329                                         $text = '[' . ++$this->mAutonumber . ']';
1330                                         $linktype = 'autonumber';
1331                                 } else {
1332                                         # Otherwise just use the URL
1333                                         $text = htmlspecialchars( $url );
1334                                         $linktype = 'free';
1335                                 }
1336                         } else {
1337                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1338                                 # Check for trail
1339                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1340                         }
1341
1342                         $text = $wgContLang->markNoConversion($text);
1343
1344                         $url = Sanitizer::cleanUrl( $url );
1345
1346                         # Process the trail (i.e. everything after this link up until start of the next link),
1347                         # replacing any non-bracketed links
1348                         $trail = $this->replaceFreeExternalLinks( $trail );
1349
1350                         # Use the encoded URL
1351                         # This means that users can paste URLs directly into the text
1352                         # Funny characters like &ouml; aren't valid in URLs anyway
1353                         # This was changed in August 2004
1354                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1355
1356                         # Register link in the output object.
1357                         # Replace unnecessary URL escape codes with the referenced character
1358                         # This prevents spammers from hiding links from the filters
1359                         $pasteurized = self::replaceUnusualEscapes( $url );
1360                         $this->mOutput->addExternalLink( $pasteurized );
1361                 }
1362
1363                 wfProfileOut( $fname );
1364                 return $s;
1365         }
1366
1367         /**
1368          * Replace anything that looks like a URL with a link
1369          * @private
1370          */
1371         function replaceFreeExternalLinks( $text ) {
1372                 global $wgContLang;
1373                 $fname = 'Parser::replaceFreeExternalLinks';
1374                 wfProfileIn( $fname );
1375
1376                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1377                 $s = array_shift( $bits );
1378                 $i = 0;
1379
1380                 $sk = $this->mOptions->getSkin();
1381
1382                 while ( $i < count( $bits ) ){
1383                         $protocol = $bits[$i++];
1384                         $remainder = $bits[$i++];
1385
1386                         $m = array();
1387                         if ( preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1388                                 # Found some characters after the protocol that look promising
1389                                 $url = $protocol . $m[1];
1390                                 $trail = $m[2];
1391
1392                                 # special case: handle urls as url args:
1393                                 # http://www.example.com/foo?=http://www.example.com/bar
1394                                 if(strlen($trail) == 0 &&
1395                                         isset($bits[$i]) &&
1396                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1397                                         preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1398                                 {
1399                                         # add protocol, arg
1400                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1401                                         $i += 2;
1402                                         $trail = $m[2];
1403                                 }
1404
1405                                 # The characters '<' and '>' (which were escaped by
1406                                 # removeHTMLtags()) should not be included in
1407                                 # URLs, per RFC 2396.
1408                                 $m2 = array();
1409                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1410                                         $trail = substr($url, $m2[0][1]) . $trail;
1411                                         $url = substr($url, 0, $m2[0][1]);
1412                                 }
1413
1414                                 # Move trailing punctuation to $trail
1415                                 $sep = ',;\.:!?';
1416                                 # If there is no left bracket, then consider right brackets fair game too
1417                                 if ( strpos( $url, '(' ) === false ) {
1418                                         $sep .= ')';
1419                                 }
1420
1421                                 $numSepChars = strspn( strrev( $url ), $sep );
1422                                 if ( $numSepChars ) {
1423                                         $trail = substr( $url, -$numSepChars ) . $trail;
1424                                         $url = substr( $url, 0, -$numSepChars );
1425                                 }
1426
1427                                 $url = Sanitizer::cleanUrl( $url );
1428
1429                                 # Is this an external image?
1430                                 $text = $this->maybeMakeExternalImage( $url );
1431                                 if ( $text === false ) {
1432                                         # Not an image, make a link
1433                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1434                                         # Register it in the output object...
1435                                         # Replace unnecessary URL escape codes with their equivalent characters
1436                                         $pasteurized = self::replaceUnusualEscapes( $url );
1437                                         $this->mOutput->addExternalLink( $pasteurized );
1438                                 }
1439                                 $s .= $text . $trail;
1440                         } else {
1441                                 $s .= $protocol . $remainder;
1442                         }
1443                 }
1444                 wfProfileOut( $fname );
1445                 return $s;
1446         }
1447
1448         /**
1449          * Replace unusual URL escape codes with their equivalent characters
1450          * @param string
1451          * @return string
1452          * @static
1453          * @todo  This can merge genuinely required bits in the path or query string,
1454          *        breaking legit URLs. A proper fix would treat the various parts of
1455          *        the URL differently; as a workaround, just use the output for
1456          *        statistical records, not for actual linking/output.
1457          */
1458         static function replaceUnusualEscapes( $url ) {
1459                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1460                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1461         }
1462
1463         /**
1464          * Callback function used in replaceUnusualEscapes().
1465          * Replaces unusual URL escape codes with their equivalent character
1466          * @static
1467          * @private
1468          */
1469         private static function replaceUnusualEscapesCallback( $matches ) {
1470                 $char = urldecode( $matches[0] );
1471                 $ord = ord( $char );
1472                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1473                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1474                         // No, shouldn't be escaped
1475                         return $char;
1476                 } else {
1477                         // Yes, leave it escaped
1478                         return $matches[0];
1479                 }
1480         }
1481
1482         /**
1483          * make an image if it's allowed, either through the global
1484          * option or through the exception
1485          * @private
1486          */
1487         function maybeMakeExternalImage( $url ) {
1488                 $sk = $this->mOptions->getSkin();
1489                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1490                 $imagesexception = !empty($imagesfrom);
1491                 $text = false;
1492                 if ( $this->mOptions->getAllowExternalImages()
1493                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1494                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1495                                 # Image found
1496                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1497                         }
1498                 }
1499                 return $text;
1500         }
1501
1502         /**
1503          * Process [[ ]] wikilinks
1504          *
1505          * @private
1506          */
1507         function replaceInternalLinks( $s ) {
1508                 global $wgContLang;
1509                 static $fname = 'Parser::replaceInternalLinks' ;
1510
1511                 wfProfileIn( $fname );
1512
1513                 wfProfileIn( $fname.'-setup' );
1514                 static $tc = FALSE;
1515                 # the % is needed to support urlencoded titles as well
1516                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1517
1518                 $sk = $this->mOptions->getSkin();
1519
1520                 #split the entire text string on occurences of [[
1521                 $a = explode( '[[', ' ' . $s );
1522                 #get the first element (all text up to first [[), and remove the space we added
1523                 $s = array_shift( $a );
1524                 $s = substr( $s, 1 );
1525
1526                 # Match a link having the form [[namespace:link|alternate]]trail
1527                 static $e1 = FALSE;
1528                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1529                 # Match cases where there is no "]]", which might still be images
1530                 static $e1_img = FALSE;
1531                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1532                 # Match the end of a line for a word that's not followed by whitespace,
1533                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1534                 $e2 = wfMsgForContent( 'linkprefix' );
1535
1536                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1537                 if( is_null( $this->mTitle ) ) {
1538                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1539                 }
1540                 $nottalk = !$this->mTitle->isTalkPage();
1541
1542                 if ( $useLinkPrefixExtension ) {
1543                         $m = array();
1544                         if ( preg_match( $e2, $s, $m ) ) {
1545                                 $first_prefix = $m[2];
1546                         } else {
1547                                 $first_prefix = false;
1548                         }
1549                 } else {
1550                         $prefix = '';
1551                 }
1552
1553                 if($wgContLang->hasVariants()) {
1554                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1555                 } else {
1556                         $selflink = array($this->mTitle->getPrefixedText());
1557                 }
1558                 $useSubpages = $this->areSubpagesAllowed();
1559                 wfProfileOut( $fname.'-setup' );
1560
1561                 # Loop for each link
1562                 for ($k = 0; isset( $a[$k] ); $k++) {
1563                         $line = $a[$k];
1564                         if ( $useLinkPrefixExtension ) {
1565                                 wfProfileIn( $fname.'-prefixhandling' );
1566                                 if ( preg_match( $e2, $s, $m ) ) {
1567                                         $prefix = $m[2];
1568                                         $s = $m[1];
1569                                 } else {
1570                                         $prefix='';
1571                                 }
1572                                 # first link
1573                                 if($first_prefix) {
1574                                         $prefix = $first_prefix;
1575                                         $first_prefix = false;
1576                                 }
1577                                 wfProfileOut( $fname.'-prefixhandling' );
1578                         }
1579
1580                         $might_be_img = false;
1581
1582                         wfProfileIn( "$fname-e1" );
1583                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1584                                 $text = $m[2];
1585                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1586                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1587                                 # the real problem is with the $e1 regex
1588                                 # See bug 1300.
1589                                 #
1590                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1591                                 # and no image is in sight. See bug 2095.
1592                                 #
1593                                 if( $text !== '' &&
1594                                         substr( $m[3], 0, 1 ) === ']' &&
1595                                         strpos($text, '[') !== false
1596                                 )
1597                                 {
1598                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1599                                         $m[3] = substr( $m[3], 1 );
1600                                 }
1601                                 # fix up urlencoded title texts
1602                                 if( strpos( $m[1], '%' ) !== false ) {
1603                                         # Should anchors '#' also be rejected?
1604                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1605                                 }
1606                                 $trail = $m[3];
1607                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1608                                 $might_be_img = true;
1609                                 $text = $m[2];
1610                                 if ( strpos( $m[1], '%' ) !== false ) {
1611                                         $m[1] = urldecode($m[1]);
1612                                 }
1613                                 $trail = "";
1614                         } else { # Invalid form; output directly
1615                                 $s .= $prefix . '[[' . $line ;
1616                                 wfProfileOut( "$fname-e1" );
1617                                 continue;
1618                         }
1619                         wfProfileOut( "$fname-e1" );
1620                         wfProfileIn( "$fname-misc" );
1621
1622                         # Don't allow internal links to pages containing
1623                         # PROTO: where PROTO is a valid URL protocol; these
1624                         # should be external links.
1625                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1626                                 $s .= $prefix . '[[' . $line ;
1627                                 continue;
1628                         }
1629
1630                         # Make subpage if necessary
1631                         if( $useSubpages ) {
1632                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1633                         } else {
1634                                 $link = $m[1];
1635                         }
1636
1637                         $noforce = (substr($m[1], 0, 1) != ':');
1638                         if (!$noforce) {
1639                                 # Strip off leading ':'
1640                                 $link = substr($link, 1);
1641                         }
1642
1643                         wfProfileOut( "$fname-misc" );
1644                         wfProfileIn( "$fname-title" );
1645                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1646                         if( !$nt ) {
1647                                 $s .= $prefix . '[[' . $line;
1648                                 wfProfileOut( "$fname-title" );
1649                                 continue;
1650                         }
1651
1652                         $ns = $nt->getNamespace();
1653                         $iw = $nt->getInterWiki();
1654                         wfProfileOut( "$fname-title" );
1655
1656                         if ($might_be_img) { # if this is actually an invalid link
1657                                 wfProfileIn( "$fname-might_be_img" );
1658                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1659                                         $found = false;
1660                                         while (isset ($a[$k+1]) ) {
1661                                                 #look at the next 'line' to see if we can close it there
1662                                                 $spliced = array_splice( $a, $k + 1, 1 );
1663                                                 $next_line = array_shift( $spliced );
1664                                                 $m = explode( ']]', $next_line, 3 );
1665                                                 if ( count( $m ) == 3 ) {
1666                                                         # the first ]] closes the inner link, the second the image
1667                                                         $found = true;
1668                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1669                                                         $trail = $m[2];
1670                                                         break;
1671                                                 } elseif ( count( $m ) == 2 ) {
1672                                                         #if there's exactly one ]] that's fine, we'll keep looking
1673                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1674                                                 } else {
1675                                                         #if $next_line is invalid too, we need look no further
1676                                                         $text .= '[[' . $next_line;
1677                                                         break;
1678                                                 }
1679                                         }
1680                                         if ( !$found ) {
1681                                                 # we couldn't find the end of this imageLink, so output it raw
1682                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1683                                                 $text = $this->replaceInternalLinks($text);
1684                                                 $s .= "{$prefix}[[$link|$text";
1685                                                 # note: no $trail, because without an end, there *is* no trail
1686                                                 wfProfileOut( "$fname-might_be_img" );
1687                                                 continue;
1688                                         }
1689                                 } else { #it's not an image, so output it raw
1690                                         $s .= "{$prefix}[[$link|$text";
1691                                         # note: no $trail, because without an end, there *is* no trail
1692                                         wfProfileOut( "$fname-might_be_img" );
1693                                         continue;
1694                                 }
1695                                 wfProfileOut( "$fname-might_be_img" );
1696                         }
1697
1698                         $wasblank = ( '' == $text );
1699                         if( $wasblank ) $text = $link;
1700
1701                         # Link not escaped by : , create the various objects
1702                         if( $noforce ) {
1703
1704                                 # Interwikis
1705                                 wfProfileIn( "$fname-interwiki" );
1706                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1707                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1708                                         $s = rtrim($s . $prefix);
1709                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1710                                         wfProfileOut( "$fname-interwiki" );
1711                                         continue;
1712                                 }
1713                                 wfProfileOut( "$fname-interwiki" );
1714
1715                                 if ( $ns == NS_IMAGE ) {
1716                                         wfProfileIn( "$fname-image" );
1717                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1718                                                 # recursively parse links inside the image caption
1719                                                 # actually, this will parse them in any other parameters, too,
1720                                                 # but it might be hard to fix that, and it doesn't matter ATM
1721                                                 $text = $this->replaceExternalLinks($text);
1722                                                 $text = $this->replaceInternalLinks($text);
1723
1724                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1725                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1726                                                 $this->mOutput->addImage( $nt->getDBkey() );
1727
1728                                                 wfProfileOut( "$fname-image" );
1729                                                 continue;
1730                                         } else {
1731                                                 # We still need to record the image's presence on the page
1732                                                 $this->mOutput->addImage( $nt->getDBkey() );
1733                                         }
1734                                         wfProfileOut( "$fname-image" );
1735
1736                                 }
1737
1738                                 if ( $ns == NS_CATEGORY ) {
1739                                         wfProfileIn( "$fname-category" );
1740                                         $s = rtrim($s . "\n"); # bug 87
1741
1742                                         if ( $wasblank ) {
1743                                                 $sortkey = $this->getDefaultSort();
1744                                         } else {
1745                                                 $sortkey = $text;
1746                                         }
1747                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1748                                         $sortkey = str_replace( "\n", '', $sortkey );
1749                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1750                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1751
1752                                         /**
1753                                          * Strip the whitespace Category links produce, see bug 87
1754                                          * @todo We might want to use trim($tmp, "\n") here.
1755                                          */
1756                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1757
1758                                         wfProfileOut( "$fname-category" );
1759                                         continue;
1760                                 }
1761                         }
1762
1763                         # Self-link checking
1764                         if( $nt->getFragment() === '' ) {
1765                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1766                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1767                                         continue;
1768                                 }
1769                         }
1770
1771                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1772                         if( $ns == NS_MEDIA ) {
1773                                 # Give extensions a chance to select the file revision for us
1774                                 $skip = $time = false;
1775                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1776                                 if ( $skip ) {
1777                                         $link = $sk->makeLinkObj( $nt );
1778                                 } else {
1779                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1780                                 }
1781                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1782                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1783                                 $this->mOutput->addImage( $nt->getDBkey() );
1784                                 continue;
1785                         } elseif( $ns == NS_SPECIAL ) {
1786                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1787                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1788                                 } else {
1789                                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1790                                 }
1791                                 continue;
1792                         } elseif( $ns == NS_IMAGE ) {
1793                                 $img = wfFindFile( $nt );
1794                                 if( $img ) {
1795                                         // Force a blue link if the file exists; may be a remote
1796                                         // upload on the shared repository, and we want to see its
1797                                         // auto-generated page.
1798                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1799                                         $this->mOutput->addLink( $nt );
1800                                         continue;
1801                                 }
1802                         }
1803                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1804                 }
1805                 wfProfileOut( $fname );
1806                 return $s;
1807         }
1808
1809         /**
1810          * Make a link placeholder. The text returned can be later resolved to a real link with
1811          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1812          * parsing of interwiki links, and secondly to allow all existence checks and
1813          * article length checks (for stub links) to be bundled into a single query.
1814          *
1815          */
1816         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1817                 wfProfileIn( __METHOD__ );
1818                 if ( ! is_object($nt) ) {
1819                         # Fail gracefully
1820                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1821                 } else {
1822                         # Separate the link trail from the rest of the link
1823                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1824
1825                         if ( $nt->isExternal() ) {
1826                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1827                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1828                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1829                         } else {
1830                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1831                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1832                                 $this->mLinkHolders['queries'][] = $query;
1833                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1834                                 $this->mLinkHolders['titles'][] = $nt;
1835
1836                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1837                         }
1838                 }
1839                 wfProfileOut( __METHOD__ );
1840                 return $retVal;
1841         }
1842
1843         /**
1844          * Render a forced-blue link inline; protect against double expansion of
1845          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1846          * Since this little disaster has to split off the trail text to avoid
1847          * breaking URLs in the following text without breaking trails on the
1848          * wiki links, it's been made into a horrible function.
1849          *
1850          * @param Title $nt
1851          * @param string $text
1852          * @param string $query
1853          * @param string $trail
1854          * @param string $prefix
1855          * @return string HTML-wikitext mix oh yuck
1856          */
1857         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1858                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1859                 $sk = $this->mOptions->getSkin();
1860                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1861                 return $this->armorLinks( $link ) . $trail;
1862         }
1863
1864         /**
1865          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1866          * going to go through further parsing steps before inline URL expansion.
1867          *
1868          * In particular this is important when using action=render, which causes
1869          * full URLs to be included.
1870          *
1871          * Oh man I hate our multi-layer parser!
1872          *
1873          * @param string more-or-less HTML
1874          * @return string less-or-more HTML with NOPARSE bits
1875          */
1876         function armorLinks( $text ) {
1877                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1878                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1879         }
1880
1881         /**
1882          * Return true if subpage links should be expanded on this page.
1883          * @return bool
1884          */
1885         function areSubpagesAllowed() {
1886                 # Some namespaces don't allow subpages
1887                 global $wgNamespacesWithSubpages;
1888                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1889         }
1890
1891         /**
1892          * Handle link to subpage if necessary
1893          * @param string $target the source of the link
1894          * @param string &$text the link text, modified as necessary
1895          * @return string the full name of the link
1896          * @private
1897          */
1898         function maybeDoSubpageLink($target, &$text) {
1899                 # Valid link forms:
1900                 # Foobar -- normal
1901                 # :Foobar -- override special treatment of prefix (images, language links)
1902                 # /Foobar -- convert to CurrentPage/Foobar
1903                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1904                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1905                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1906
1907                 $fname = 'Parser::maybeDoSubpageLink';
1908                 wfProfileIn( $fname );
1909                 $ret = $target; # default return value is no change
1910
1911                 # Some namespaces don't allow subpages,
1912                 # so only perform processing if subpages are allowed
1913                 if( $this->areSubpagesAllowed() ) {
1914                         $hash = strpos( $target, '#' );
1915                         if( $hash !== false ) {
1916                                 $suffix = substr( $target, $hash );
1917                                 $target = substr( $target, 0, $hash );
1918                         } else {
1919                                 $suffix = '';
1920                         }
1921                         # bug 7425
1922                         $target = trim( $target );
1923                         # Look at the first character
1924                         if( $target != '' && $target{0} == '/' ) {
1925                                 # / at end means we don't want the slash to be shown
1926                                 $m = array();
1927                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1928                                 if( $trailingSlashes ) {
1929                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1930                                 } else {
1931                                         $noslash = substr( $target, 1 );
1932                                 }
1933
1934                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1935                                 if( '' === $text ) {
1936                                         $text = $target . $suffix;
1937                                 } # this might be changed for ugliness reasons
1938                         } else {
1939                                 # check for .. subpage backlinks
1940                                 $dotdotcount = 0;
1941                                 $nodotdot = $target;
1942                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1943                                         ++$dotdotcount;
1944                                         $nodotdot = substr( $nodotdot, 3 );
1945                                 }
1946                                 if($dotdotcount > 0) {
1947                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1948                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1949                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1950                                                 # / at the end means don't show full path
1951                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1952                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1953                                                         if( '' === $text ) {
1954                                                                 $text = $nodotdot . $suffix;
1955                                                         }
1956                                                 }
1957                                                 $nodotdot = trim( $nodotdot );
1958                                                 if( $nodotdot != '' ) {
1959                                                         $ret .= '/' . $nodotdot;
1960                                                 }
1961                                                 $ret .= $suffix;
1962                                         }
1963                                 }
1964                         }
1965                 }
1966
1967                 wfProfileOut( $fname );
1968                 return $ret;
1969         }
1970
1971         /**#@+
1972          * Used by doBlockLevels()
1973          * @private
1974          */
1975         /* private */ function closeParagraph() {
1976                 $result = '';
1977                 if ( '' != $this->mLastSection ) {
1978                         $result = '</' . $this->mLastSection  . ">\n";
1979                 }
1980                 $this->mInPre = false;
1981                 $this->mLastSection = '';
1982                 return $result;
1983         }
1984         # getCommon() returns the length of the longest common substring
1985         # of both arguments, starting at the beginning of both.
1986         #
1987         /* private */ function getCommon( $st1, $st2 ) {
1988                 $fl = strlen( $st1 );
1989                 $shorter = strlen( $st2 );
1990                 if ( $fl < $shorter ) { $shorter = $fl; }
1991
1992                 for ( $i = 0; $i < $shorter; ++$i ) {
1993                         if ( $st1{$i} != $st2{$i} ) { break; }
1994                 }
1995                 return $i;
1996         }
1997         # These next three functions open, continue, and close the list
1998         # element appropriate to the prefix character passed into them.
1999         #
2000         /* private */ function openList( $char ) {
2001                 $result = $this->closeParagraph();
2002
2003                 if ( '*' == $char ) { $result .= '<ul><li>'; }
2004                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
2005                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
2006                 else if ( ';' == $char ) {
2007                         $result .= '<dl><dt>';
2008                         $this->mDTopen = true;
2009                 }
2010                 else { $result = '<!-- ERR 1 -->'; }
2011
2012                 return $result;
2013         }
2014
2015         /* private */ function nextItem( $char ) {
2016                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
2017                 else if ( ':' == $char || ';' == $char ) {
2018                         $close = '</dd>';
2019                         if ( $this->mDTopen ) { $close = '</dt>'; }
2020                         if ( ';' == $char ) {
2021                                 $this->mDTopen = true;
2022                                 return $close . '<dt>';
2023                         } else {
2024                                 $this->mDTopen = false;
2025                                 return $close . '<dd>';
2026                         }
2027                 }
2028                 return '<!-- ERR 2 -->';
2029         }
2030
2031         /* private */ function closeList( $char ) {
2032                 if ( '*' == $char ) { $text = '</li></ul>'; }
2033                 else if ( '#' == $char ) { $text = '</li></ol>'; }
2034                 else if ( ':' == $char ) {
2035                         if ( $this->mDTopen ) {
2036                                 $this->mDTopen = false;
2037                                 $text = '</dt></dl>';
2038                         } else {
2039                                 $text = '</dd></dl>';
2040                         }
2041                 }
2042                 else {  return '<!-- ERR 3 -->'; }
2043                 return $text."\n";
2044         }
2045         /**#@-*/
2046
2047         /**
2048          * Make lists from lines starting with ':', '*', '#', etc.
2049          *
2050          * @private
2051          * @return string the lists rendered as HTML
2052          */
2053         function doBlockLevels( $text, $linestart ) {
2054                 $fname = 'Parser::doBlockLevels';
2055                 wfProfileIn( $fname );
2056
2057                 # Parsing through the text line by line.  The main thing
2058                 # happening here is handling of block-level elements p, pre,
2059                 # and making lists from lines starting with * # : etc.
2060                 #
2061                 $textLines = explode( "\n", $text );
2062
2063                 $lastPrefix = $output = '';
2064                 $this->mDTopen = $inBlockElem = false;
2065                 $prefixLength = 0;
2066                 $paragraphStack = false;
2067
2068                 if ( !$linestart ) {
2069                         $output .= array_shift( $textLines );
2070                 }
2071                 foreach ( $textLines as $oLine ) {
2072                         $lastPrefixLength = strlen( $lastPrefix );
2073                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2074                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2075                         if ( !$this->mInPre ) {
2076                                 # Multiple prefixes may abut each other for nested lists.
2077                                 $prefixLength = strspn( $oLine, '*#:;' );
2078                                 $pref = substr( $oLine, 0, $prefixLength );
2079
2080                                 # eh?
2081                                 $pref2 = str_replace( ';', ':', $pref );
2082                                 $t = substr( $oLine, $prefixLength );
2083                                 $this->mInPre = !empty($preOpenMatch);
2084                         } else {
2085                                 # Don't interpret any other prefixes in preformatted text
2086                                 $prefixLength = 0;
2087                                 $pref = $pref2 = '';
2088                                 $t = $oLine;
2089                         }
2090
2091                         # List generation
2092                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2093                                 # Same as the last item, so no need to deal with nesting or opening stuff
2094                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2095                                 $paragraphStack = false;
2096
2097                                 if ( substr( $pref, -1 ) == ';') {
2098                                         # The one nasty exception: definition lists work like this:
2099                                         # ; title : definition text
2100                                         # So we check for : in the remainder text to split up the
2101                                         # title and definition, without b0rking links.
2102                                         $term = $t2 = '';
2103                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2104                                                 $t = $t2;
2105                                                 $output .= $term . $this->nextItem( ':' );
2106                                         }
2107                                 }
2108                         } elseif( $prefixLength || $lastPrefixLength ) {
2109                                 # Either open or close a level...
2110                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2111                                 $paragraphStack = false;
2112
2113                                 while( $commonPrefixLength < $lastPrefixLength ) {
2114                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2115                                         --$lastPrefixLength;
2116                                 }
2117                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2118                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2119                                 }
2120                                 while ( $prefixLength > $commonPrefixLength ) {
2121                                         $char = substr( $pref, $commonPrefixLength, 1 );
2122                                         $output .= $this->openList( $char );
2123
2124                                         if ( ';' == $char ) {
2125                                                 # FIXME: This is dupe of code above
2126                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2127                                                         $t = $t2;
2128                                                         $output .= $term . $this->nextItem( ':' );
2129                                                 }
2130                                         }
2131                                         ++$commonPrefixLength;
2132                                 }
2133                                 $lastPrefix = $pref2;
2134                         }
2135                         if( 0 == $prefixLength ) {
2136                                 wfProfileIn( "$fname-paragraph" );
2137                                 # No prefix (not in list)--go to paragraph mode
2138                                 // XXX: use a stack for nestable elements like span, table and div
2139                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2140                                 $closematch = preg_match(
2141                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2142                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2143                                 if ( $openmatch or $closematch ) {
2144                                         $paragraphStack = false;
2145                                         # TODO bug 5718: paragraph closed
2146                                         $output .= $this->closeParagraph();
2147                                         if ( $preOpenMatch and !$preCloseMatch ) {
2148                                                 $this->mInPre = true;
2149                                         }
2150                                         if ( $closematch ) {
2151                                                 $inBlockElem = false;
2152                                         } else {
2153                                                 $inBlockElem = true;
2154                                         }
2155                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2156                                         if ( '' != $t and ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2157                                                 // pre
2158                                                 if ($this->mLastSection != 'pre') {
2159                                                         $paragraphStack = false;
2160                                                         $output .= $this->closeParagraph().'<pre>';
2161                                                         $this->mLastSection = 'pre';
2162                                                 }
2163                                                 $t = substr( $t, 1 );
2164                                         } else {
2165                                                 // paragraph
2166                                                 if ( '' == trim($t) ) {
2167                                                         if ( $paragraphStack ) {
2168                                                                 $output .= $paragraphStack.'<br />';
2169                                                                 $paragraphStack = false;
2170                                                                 $this->mLastSection = 'p';
2171                                                         } else {
2172                                                                 if ($this->mLastSection != 'p' ) {
2173                                                                         $output .= $this->closeParagraph();
2174                                                                         $this->mLastSection = '';
2175                                                                         $paragraphStack = '<p>';
2176                                                                 } else {
2177                                                                         $paragraphStack = '</p><p>';
2178                                                                 }
2179                                                         }
2180                                                 } else {
2181                                                         if ( $paragraphStack ) {
2182                                                                 $output .= $paragraphStack;
2183                                                                 $paragraphStack = false;
2184                                                                 $this->mLastSection = 'p';
2185                                                         } else if ($this->mLastSection != 'p') {
2186                                                                 $output .= $this->closeParagraph().'<p>';
2187                                                                 $this->mLastSection = 'p';
2188                                                         }
2189                                                 }
2190                                         }
2191                                 }
2192                                 wfProfileOut( "$fname-paragraph" );
2193                         }
2194                         // somewhere above we forget to get out of pre block (bug 785)
2195                         if($preCloseMatch && $this->mInPre) {
2196                                 $this->mInPre = false;
2197                         }
2198                         if ($paragraphStack === false) {
2199                                 $output .= $t."\n";
2200                         }
2201                 }
2202                 while ( $prefixLength ) {
2203                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2204                         --$prefixLength;
2205                 }
2206                 if ( '' != $this->mLastSection ) {
2207                         $output .= '</' . $this->mLastSection . '>';
2208                         $this->mLastSection = '';
2209                 }
2210
2211                 wfProfileOut( $fname );
2212                 return $output;
2213         }
2214
2215         /**
2216          * Split up a string on ':', ignoring any occurences inside tags
2217          * to prevent illegal overlapping.
2218          * @param string $str the string to split
2219          * @param string &$before set to everything before the ':'
2220          * @param string &$after set to everything after the ':'
2221          * return string the position of the ':', or false if none found
2222          */
2223         function findColonNoLinks($str, &$before, &$after) {
2224                 $fname = 'Parser::findColonNoLinks';
2225                 wfProfileIn( $fname );
2226
2227                 $pos = strpos( $str, ':' );
2228                 if( $pos === false ) {
2229                         // Nothing to find!
2230                         wfProfileOut( $fname );
2231                         return false;
2232                 }
2233
2234                 $lt = strpos( $str, '<' );
2235                 if( $lt === false || $lt > $pos ) {
2236                         // Easy; no tag nesting to worry about
2237                         $before = substr( $str, 0, $pos );
2238                         $after = substr( $str, $pos+1 );
2239                         wfProfileOut( $fname );
2240                         return $pos;
2241                 }
2242
2243                 // Ugly state machine to walk through avoiding tags.
2244                 $state = self::COLON_STATE_TEXT;
2245                 $stack = 0;
2246                 $len = strlen( $str );
2247                 for( $i = 0; $i < $len; $i++ ) {
2248                         $c = $str{$i};
2249
2250                         switch( $state ) {
2251                         // (Using the number is a performance hack for common cases)
2252                         case 0: // self::COLON_STATE_TEXT:
2253                                 switch( $c ) {
2254                                 case "<":
2255                                         // Could be either a <start> tag or an </end> tag
2256                                         $state = self::COLON_STATE_TAGSTART;
2257                                         break;
2258                                 case ":":
2259                                         if( $stack == 0 ) {
2260                                                 // We found it!
2261                                                 $before = substr( $str, 0, $i );
2262                                                 $after = substr( $str, $i + 1 );
2263                                                 wfProfileOut( $fname );
2264                                                 return $i;
2265                                         }
2266                                         // Embedded in a tag; don't break it.
2267                                         break;
2268                                 default:
2269                                         // Skip ahead looking for something interesting
2270                                         $colon = strpos( $str, ':', $i );
2271                                         if( $colon === false ) {
2272                                                 // Nothing else interesting
2273                                                 wfProfileOut( $fname );
2274                                                 return false;
2275                                         }
2276                                         $lt = strpos( $str, '<', $i );
2277                                         if( $stack === 0 ) {
2278                                                 if( $lt === false || $colon < $lt ) {
2279                                                         // We found it!
2280                                                         $before = substr( $str, 0, $colon );
2281                                                         $after = substr( $str, $colon + 1 );
2282                                                         wfProfileOut( $fname );
2283                                                         return $i;
2284                                                 }
2285                                         }
2286                                         if( $lt === false ) {
2287                                                 // Nothing else interesting to find; abort!
2288                                                 // We're nested, but there's no close tags left. Abort!
2289                                                 break 2;
2290                                         }
2291                                         // Skip ahead to next tag start
2292                                         $i = $lt;
2293                                         $state = self::COLON_STATE_TAGSTART;
2294                                 }
2295                                 break;
2296                         case 1: // self::COLON_STATE_TAG:
2297                                 // In a <tag>
2298                                 switch( $c ) {
2299                                 case ">":
2300                                         $stack++;
2301                                         $state = self::COLON_STATE_TEXT;
2302                                         break;
2303                                 case "/":
2304                                         // Slash may be followed by >?
2305                                         $state = self::COLON_STATE_TAGSLASH;
2306                                         break;
2307                                 default:
2308                                         // ignore
2309                                 }
2310                                 break;
2311                         case 2: // self::COLON_STATE_TAGSTART:
2312                                 switch( $c ) {
2313                                 case "/":
2314                                         $state = self::COLON_STATE_CLOSETAG;
2315                                         break;
2316                                 case "!":
2317                                         $state = self::COLON_STATE_COMMENT;
2318                                         break;
2319                                 case ">":
2320                                         // Illegal early close? This shouldn't happen D:
2321                                         $state = self::COLON_STATE_TEXT;
2322                                         break;
2323                                 default:
2324                                         $state = self::COLON_STATE_TAG;
2325                                 }
2326                                 break;
2327                         case 3: // self::COLON_STATE_CLOSETAG:
2328                                 // In a </tag>
2329                                 if( $c == ">" ) {
2330                                         $stack--;
2331                                         if( $stack < 0 ) {
2332                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2333                                                 wfProfileOut( $fname );
2334                                                 return false;
2335                                         }
2336                                         $state = self::COLON_STATE_TEXT;
2337                                 }
2338                                 break;
2339                         case self::COLON_STATE_TAGSLASH:
2340                                 if( $c == ">" ) {
2341                                         // Yes, a self-closed tag <blah/>
2342                                         $state = self::COLON_STATE_TEXT;
2343                                 } else {
2344                                         // Probably we're jumping the gun, and this is an attribute
2345                                         $state = self::COLON_STATE_TAG;
2346                                 }
2347                                 break;
2348                         case 5: // self::COLON_STATE_COMMENT:
2349                                 if( $c == "-" ) {
2350                                         $state = self::COLON_STATE_COMMENTDASH;
2351                                 }
2352                                 break;
2353                         case self::COLON_STATE_COMMENTDASH:
2354                                 if( $c == "-" ) {
2355                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2356                                 } else {
2357                                         $state = self::COLON_STATE_COMMENT;
2358                                 }
2359                                 break;
2360                         case self::COLON_STATE_COMMENTDASHDASH:
2361                                 if( $c == ">" ) {
2362                                         $state = self::COLON_STATE_TEXT;
2363                                 } else {
2364                                         $state = self::COLON_STATE_COMMENT;
2365                                 }
2366                                 break;
2367                         default:
2368                                 throw new MWException( "State machine error in $fname" );
2369                         }
2370                 }
2371                 if( $stack > 0 ) {
2372                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2373                         return false;
2374                 }
2375                 wfProfileOut( $fname );
2376                 return false;
2377         }
2378
2379         /**
2380          * Return value of a magic variable (like PAGENAME)
2381          *
2382          * @private
2383          */
2384         function getVariableValue( $index ) {
2385                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2386
2387                 /**
2388                  * Some of these require message or data lookups and can be
2389                  * expensive to check many times.
2390                  */
2391                 static $varCache = array();
2392                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2393                         if ( isset( $varCache[$index] ) ) {
2394                                 return $varCache[$index];
2395                         }
2396                 }
2397
2398                 $ts = time();
2399                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2400
2401                 # Use the time zone
2402                 global $wgLocaltimezone;
2403                 if ( isset( $wgLocaltimezone ) ) {
2404                         $oldtz = getenv( 'TZ' );
2405                         putenv( 'TZ='.$wgLocaltimezone );
2406                 }
2407
2408                 wfSuppressWarnings(); // E_STRICT system time bitching
2409                 $localTimestamp = date( 'YmdHis', $ts );
2410                 $localMonth = date( 'm', $ts );
2411                 $localMonthName = date( 'n', $ts );
2412                 $localDay = date( 'j', $ts );
2413                 $localDay2 = date( 'd', $ts );
2414                 $localDayOfWeek = date( 'w', $ts );
2415                 $localWeek = date( 'W', $ts );
2416                 $localYear = date( 'Y', $ts );
2417                 $localHour = date( 'H', $ts );
2418                 if ( isset( $wgLocaltimezone ) ) {
2419                         putenv( 'TZ='.$oldtz );
2420                 }
2421                 wfRestoreWarnings();
2422
2423                 switch ( $index ) {
2424                         case 'currentmonth':
2425                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2426                         case 'currentmonthname':
2427                                 return $varCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2428                         case 'currentmonthnamegen':
2429                                 return $varCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2430                         case 'currentmonthabbrev':
2431                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2432                         case 'currentday':
2433                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2434                         case 'currentday2':
2435                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2436                         case 'localmonth':
2437                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2438                         case 'localmonthname':
2439                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2440                         case 'localmonthnamegen':
2441                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2442                         case 'localmonthabbrev':
2443                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2444                         case 'localday':
2445                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2446                         case 'localday2':
2447                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2448                         case 'pagename':
2449                                 return wfEscapeWikiText( $this->mTitle->getText() );
2450                         case 'pagenamee':
2451                                 return $this->mTitle->getPartialURL();
2452                         case 'fullpagename':
2453                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2454                         case 'fullpagenamee':
2455                                 return $this->mTitle->getPrefixedURL();
2456                         case 'subpagename':
2457                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2458                         case 'subpagenamee':
2459                                 return $this->mTitle->getSubpageUrlForm();
2460                         case 'basepagename':
2461                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2462                         case 'basepagenamee':
2463                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2464                         case 'talkpagename':
2465                                 if( $this->mTitle->canTalk() ) {
2466                                         $talkPage = $this->mTitle->getTalkPage();
2467                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2468                                 } else {
2469                                         return '';
2470                                 }
2471                         case 'talkpagenamee':
2472                                 if( $this->mTitle->canTalk() ) {
2473                                         $talkPage = $this->mTitle->getTalkPage();
2474                                         return $talkPage->getPrefixedUrl();
2475                                 } else {
2476                                         return '';
2477                                 }
2478                         case 'subjectpagename':
2479                                 $subjPage = $this->mTitle->getSubjectPage();
2480                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2481                         case 'subjectpagenamee':
2482                                 $subjPage = $this->mTitle->getSubjectPage();
2483                                 return $subjPage->getPrefixedUrl();
2484                         case 'revisionid':
2485                                 return $this->mRevisionId;
2486                         case 'revisionday':
2487                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2488                         case 'revisionday2':
2489                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2490                         case 'revisionmonth':
2491                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2492                         case 'revisionyear':
2493                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2494                         case 'revisiontimestamp':
2495                                 return $this->getRevisionTimestamp();
2496                         case 'namespace':
2497                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2498                         case 'namespacee':
2499                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2500                         case 'talkspace':
2501                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2502                         case 'talkspacee':
2503                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2504                         case 'subjectspace':
2505                                 return $this->mTitle->getSubjectNsText();
2506                         case 'subjectspacee':
2507                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2508                         case 'currentdayname':
2509                                 return $varCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2510                         case 'currentyear':
2511                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2512                         case 'currenttime':
2513                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2514                         case 'currenthour':
2515                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2516                         case 'currentweek':
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)gmdate( 'W', $ts ) );
2520                         case 'currentdow':
2521                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2522                         case 'localdayname':
2523                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2524                         case 'localyear':
2525                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2526                         case 'localtime':
2527                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2528                         case 'localhour':
2529                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2530                         case 'localweek':
2531                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2532                                 // int to remove the padding
2533                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2534                         case 'localdow':
2535                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2536                         case 'numberofarticles':
2537                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2538                         case 'numberoffiles':
2539                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2540                         case 'numberofusers':
2541                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2542                         case 'numberofpages':
2543                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2544                         case 'numberofadmins':
2545                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::admins() );
2546                         case 'numberofedits':
2547                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::edits() );
2548                         case 'currenttimestamp':
2549                                 return $varCache[$index] = wfTimestampNow();
2550                         case 'localtimestamp':
2551                                 return $varCache[$index] = $localTimestamp;
2552                         case 'currentversion':
2553                                 return $varCache[$index] = SpecialVersion::getVersion();
2554                         case 'sitename':
2555                                 return $wgSitename;
2556                         case 'server':
2557                                 return $wgServer;
2558                         case 'servername':
2559                                 return $wgServerName;
2560                         case 'scriptpath':
2561                                 return $wgScriptPath;
2562                         case 'directionmark':
2563                                 return $wgContLang->getDirMark();
2564                         case 'contentlanguage':
2565                                 global $wgContLanguageCode;
2566                                 return $wgContLanguageCode;
2567                         default:
2568                                 $ret = null;
2569                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2570                                         return $ret;
2571                                 else
2572                                         return null;
2573                 }
2574         }
2575
2576         /**
2577          * initialise the magic variables (like CURRENTMONTHNAME)
2578          *
2579          * @private
2580          */
2581         function initialiseVariables() {
2582                 $fname = 'Parser::initialiseVariables';
2583                 wfProfileIn( $fname );
2584                 $variableIDs = MagicWord::getVariableIDs();
2585
2586                 $this->mVariables = array();
2587                 foreach ( $variableIDs as $id ) {
2588                         $mw =& MagicWord::get( $id );
2589                         $mw->addToArray( $this->mVariables, $id );
2590                 }
2591                 wfProfileOut( $fname );
2592         }
2593
2594         /**
2595          * parse any parentheses in format ((title|part|part))
2596          * and call callbacks to get a replacement text for any found piece
2597          *
2598          * @param string $text The text to parse
2599          * @param array $callbacks rules in form:
2600          *     '{' => array(                            # opening parentheses
2601          *                                      'end' => '}',   # closing parentheses
2602          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2603          *                                                                3 => callback         # replacement callback to call if {{{..}}} is found
2604          *                                                                )
2605          *                                      )
2606          *                                      'min' => 2,     # Minimum parenthesis count in cb
2607          *                                      'max' => 3,     # Maximum parenthesis count in cb
2608          * @private
2609          */
2610         function replace_callback ($text, $callbacks) {
2611                 wfProfileIn( __METHOD__ );
2612                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2613                 $lastOpeningBrace = -1;                 # last not closed parentheses
2614
2615                 $validOpeningBraces = implode( '', array_keys( $callbacks ) );
2616
2617                 $i = 0;
2618                 while ( $i < strlen( $text ) ) {
2619                         # Find next opening brace, closing brace or pipe
2620                         if ( $lastOpeningBrace == -1 ) {
2621                                 $currentClosing = '';
2622                                 $search = $validOpeningBraces;
2623                         } else {
2624                                 $currentClosing = $openingBraceStack[$lastOpeningBrace]['braceEnd'];
2625                                 $search = $validOpeningBraces . '|' . $currentClosing;
2626                         }
2627                         $rule = null;
2628                         $i += strcspn( $text, $search, $i );
2629                         if ( $i < strlen( $text ) ) {
2630                                 if ( $text[$i] == '|' ) {
2631                                         $found = 'pipe';
2632                                 } elseif ( $text[$i] == $currentClosing ) {
2633                                         $found = 'close';
2634                                 } elseif ( isset( $callbacks[$text[$i]] ) ) {
2635                                         $found = 'open';
2636                                         $rule = $callbacks[$text[$i]];
2637                                 } else {
2638                                         # Some versions of PHP have a strcspn which stops on null characters
2639                                         # Ignore and continue
2640                                         ++$i;
2641                                         continue;
2642                                 }
2643                         } else {
2644                                 # All done
2645                                 break;
2646                         }
2647
2648                         if ( $found == 'open' ) {
2649                                 # found opening brace, let's add it to parentheses stack
2650                                 $piece = array('brace' => $text[$i],
2651                                                            'braceEnd' => $rule['end'],
2652                                                            'title' => '',
2653                                                            'parts' => null);
2654
2655                                 # count opening brace characters
2656                                 $piece['count'] = strspn( $text, $piece['brace'], $i );
2657                                 $piece['startAt'] = $piece['partStart'] = $i + $piece['count'];
2658                                 $i += $piece['count'];
2659
2660                                 # we need to add to stack only if opening brace count is enough for one of the rules
2661                                 if ( $piece['count'] >= $rule['min'] ) {
2662                                         $lastOpeningBrace ++;
2663                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2664                                 }
2665                         } elseif ( $found == 'close' ) {
2666                                 # lets check if it is enough characters for closing brace
2667                                 $maxCount = $openingBraceStack[$lastOpeningBrace]['count'];
2668                                 $count = strspn( $text, $text[$i], $i, $maxCount );
2669
2670                                 # check for maximum matching characters (if there are 5 closing
2671                                 # characters, we will probably need only 3 - depending on the rules)
2672                                 $matchingCount = 0;
2673                                 $matchingCallback = null;
2674                                 $cbType = $callbacks[$openingBraceStack[$lastOpeningBrace]['brace']];
2675                                 if ( $count > $cbType['max'] ) {
2676                                         # The specified maximum exists in the callback array, unless the caller
2677                                         # has made an error
2678                                         $matchingCount = $cbType['max'];
2679                                 } else {
2680                                         # Count is less than the maximum
2681                                         # Skip any gaps in the callback array to find the true largest match
2682                                         # Need to use array_key_exists not isset because the callback can be null
2683                                         $matchingCount = $count;
2684                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $cbType['cb'] ) ) {
2685                                                 --$matchingCount;
2686                                         }
2687                                 }
2688
2689                                 if ($matchingCount <= 0) {
2690                                         $i += $count;
2691                                         continue;
2692                                 }
2693                                 $matchingCallback = $cbType['cb'][$matchingCount];
2694
2695                                 # let's set a title or last part (if '|' was found)
2696                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2697                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2698                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2699                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2700                                 } else {
2701                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2702                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2703                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2704                                 }
2705
2706                                 $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2707                                 $pieceEnd = $i + $matchingCount;
2708
2709                                 if( is_callable( $matchingCallback ) ) {
2710                                         $cbArgs = array (
2711                                                                          'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2712                                                                          'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2713                                                                          'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2714                                                                          'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == "\n")),
2715                                                                          );
2716                                         # finally we can call a user callback and replace piece of text
2717                                         $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2718                                         $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2719                                         $i = $pieceStart + strlen($replaceWith);
2720                                 } else {
2721                                         # null value for callback means that parentheses should be parsed, but not replaced
2722                                         $i += $matchingCount;
2723                                 }
2724
2725                                 # reset last opening parentheses, but keep it in case there are unused characters
2726                                 $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2727                                                            'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2728                                                            'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2729                                                            'title' => '',
2730                                                            'parts' => null,
2731                                                            'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2732                                 $openingBraceStack[$lastOpeningBrace--] = null;
2733
2734                                 if ($matchingCount < $piece['count']) {
2735                                         $piece['count'] -= $matchingCount;
2736                                         $piece['startAt'] -= $matchingCount;
2737                                         $piece['partStart'] = $piece['startAt'];
2738                                         # do we still qualify for any callback with remaining count?
2739                                         $currentCbList = $callbacks[$piece['brace']]['cb'];
2740                                         while ( $piece['count'] ) {
2741                                                 if ( array_key_exists( $piece['count'], $currentCbList ) ) {
2742                                                         $lastOpeningBrace++;
2743                                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2744                                                         break;
2745                                                 }
2746                                                 --$piece['count'];
2747                                         }
2748                                 }
2749                         } elseif ( $found == 'pipe' ) {
2750                                 # lets set a title if it is a first separator, or next part otherwise
2751                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2752                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2753                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2754                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2755                                         $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2756                                 } else {
2757                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2758                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2759                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2760                                 }
2761                                 $openingBraceStack[$lastOpeningBrace]['partStart'] = ++$i;
2762                         }
2763                 }
2764
2765                 wfProfileOut( __METHOD__ );
2766                 return $text;
2767         }
2768
2769         /**
2770          * Replace magic variables, templates, and template arguments
2771          * with the appropriate text. Templates are substituted recursively,
2772          * taking care to avoid infinite loops.
2773          *
2774          * Note that the substitution depends on value of $mOutputType:
2775          *  self::OT_WIKI: only {{subst:}} templates
2776          *  self::OT_MSG: only magic variables
2777          *  self::OT_HTML: all templates and magic variables
2778          *
2779          * @param string $tex The text to transform
2780          * @param array $args Key-value pairs representing template parameters to substitute
2781          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2782          * @private
2783          */
2784         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2785                 # Prevent too big inclusions
2786                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2787                         return $text;
2788                 }
2789
2790                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2791                 wfProfileIn( $fname );
2792
2793                 # This function is called recursively. To keep track of arguments we need a stack:
2794                 array_push( $this->mArgStack, $args );
2795
2796                 $braceCallbacks = array();
2797                 if ( !$argsOnly ) {
2798                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2799                 }
2800                 if ( $this->mOutputType != self::OT_MSG ) {
2801                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2802                 }
2803                 if ( $braceCallbacks ) {
2804                         $callbacks = array(
2805                                 '{' => array(
2806                                         'end' => '}',
2807                                         'cb' => $braceCallbacks,
2808                                         'min' => $argsOnly ? 3 : 2,
2809                                         'max' => isset( $braceCallbacks[3] ) ? 3 : 2,
2810                                 ),
2811                                 '[' => array(
2812                                         'end' => ']',
2813                                         'cb' => array(2=>null),
2814                                         'min' => 2,
2815                                         'max' => 2,
2816                                 )
2817                         );
2818                         $text = $this->replace_callback ($text, $callbacks);
2819
2820                         array_pop( $this->mArgStack );
2821                 }
2822                 wfProfileOut( $fname );
2823                 return $text;
2824         }
2825
2826         /**
2827          * Replace magic variables
2828          * @private
2829          */
2830         function variableSubstitution( $matches ) {
2831                 global $wgContLang;
2832                 $fname = 'Parser::variableSubstitution';
2833                 $varname = $wgContLang->lc($matches[1]);
2834                 wfProfileIn( $fname );
2835                 $skip = false;
2836                 if ( $this->mOutputType == self::OT_WIKI ) {
2837                         # Do only magic variables prefixed by SUBST
2838                         $mwSubst =& MagicWord::get( 'subst' );
2839                         if (!$mwSubst->matchStartAndRemove( $varname ))
2840                                 $skip = true;
2841                         # Note that if we don't substitute the variable below,
2842                         # we don't remove the {{subst:}} magic word, in case
2843                         # it is a template rather than a magic variable.
2844                 }
2845                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2846                         $id = $this->mVariables[$varname];
2847                         # Now check if we did really match, case sensitive or not
2848                         $mw =& MagicWord::get( $id );
2849                         if ($mw->match($matches[1])) {
2850                                 $text = $this->getVariableValue( $id );
2851                                 if (MagicWord::getCacheTTL($id)>-1)
2852                                         $this->mOutput->mContainsOldMagic = true;
2853                         } else {
2854                                 $text = $matches[0];
2855                         }
2856                 } else {
2857                         $text = $matches[0];
2858                 }
2859                 wfProfileOut( $fname );
2860                 return $text;
2861         }
2862
2863
2864         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2865         static function createAssocArgs( $args ) {
2866                 $assocArgs = array();
2867                 $index = 1;
2868                 foreach( $args as $arg ) {
2869                         $eqpos = strpos( $arg, '=' );
2870                         if ( $eqpos === false ) {
2871                                 $assocArgs[$index++] = $arg;
2872                         } else {
2873                                 $name = trim( substr( $arg, 0, $eqpos ) );
2874                                 $value = trim( substr( $arg, $eqpos+1 ) );
2875                                 if ( $value === false ) {
2876                                         $value = '';
2877                                 }
2878                                 if ( $name !== false ) {
2879                                         $assocArgs[$name] = $value;
2880                                 }
2881                         }
2882                 }
2883
2884                 return $assocArgs;
2885         }
2886
2887         /**
2888          * Return the text of a template, after recursively
2889          * replacing any variables or templates within the template.
2890          *
2891          * @param array $piece The parts of the template
2892          *  $piece['text']: matched text
2893          *  $piece['title']: the title, i.e. the part before the |
2894          *  $piece['parts']: the parameter array
2895          * @return string the text of the template
2896          * @private
2897          */
2898         function braceSubstitution( $piece ) {
2899                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2900                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2901                 wfProfileIn( $fname );
2902                 wfProfileIn( __METHOD__.'-setup' );
2903
2904                 # Flags
2905                 $found = false;             # $text has been filled
2906                 $nowiki = false;            # wiki markup in $text should be escaped
2907                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2908                 $noargs = false;            # Don't replace triple-brace arguments in $text
2909                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2910                 $headingOffset = 0;         # Skip headings when number, to account for those that weren't transcluded.
2911                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2912                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2913
2914                 # Title object, where $text came from
2915                 $title = NULL;
2916
2917                 $linestart = '';
2918
2919
2920                 # $part1 is the bit before the first |, and must contain only title characters
2921                 # $args is a list of arguments, starting from index 0, not including $part1
2922
2923                 $titleText = $part1 = $piece['title'];
2924                 # If the third subpattern matched anything, it will start with |
2925
2926                 if (null == $piece['parts']) {
2927                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2928                         if ($replaceWith != $piece['text']) {
2929                                 $text = $replaceWith;
2930                                 $found = true;
2931                                 $noparse = true;
2932                                 $noargs = true;
2933                         }
2934                 }
2935
2936                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2937                 wfProfileOut( __METHOD__.'-setup' );
2938
2939                 # SUBST
2940                 wfProfileIn( __METHOD__.'-modifiers' );
2941                 if ( !$found ) {
2942                         $mwSubst =& MagicWord::get( 'subst' );
2943                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2944                                 # One of two possibilities is true:
2945                                 # 1) Found SUBST but not in the PST phase
2946                                 # 2) Didn't find SUBST and in the PST phase
2947                                 # In either case, return without further processing
2948                                 $text = $piece['text'];
2949                                 $found = true;
2950                                 $noparse = true;
2951                                 $noargs = true;
2952                         }
2953                 }
2954
2955                 # MSG, MSGNW and RAW
2956                 if ( !$found ) {
2957                         # Check for MSGNW:
2958                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2959                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2960                                 $nowiki = true;
2961                         } else {
2962                                 # Remove obsolete MSG:
2963                                 $mwMsg =& MagicWord::get( 'msg' );
2964                                 $mwMsg->matchStartAndRemove( $part1 );
2965                         }
2966
2967                         # Check for RAW:
2968                         $mwRaw =& MagicWord::get( 'raw' );
2969                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2970                                 $forceRawInterwiki = true;
2971                         }
2972                 }
2973                 wfProfileOut( __METHOD__.'-modifiers' );
2974
2975                 //save path level before recursing into functions & templates.
2976                 $lastPathLevel = $this->mTemplatePath;
2977
2978                 # Parser functions
2979                 if ( !$found ) {
2980                         wfProfileIn( __METHOD__ . '-pfunc' );
2981
2982                         $colonPos = strpos( $part1, ':' );
2983                         if ( $colonPos !== false ) {
2984                                 # Case sensitive functions
2985                                 $function = substr( $part1, 0, $colonPos );
2986                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2987                                         $function = $this->mFunctionSynonyms[1][$function];
2988                                 } else {
2989                                         # Case insensitive functions
2990                                         $function = strtolower( $function );
2991                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2992                                                 $function = $this->mFunctionSynonyms[0][$function];
2993                                         } else {
2994                                                 $function = false;
2995                                         }
2996                                 }
2997                                 if ( $function ) {
2998                                         $funcArgs = array_map( 'trim', $args );
2999                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
3000                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
3001                                         $found = true;
3002
3003                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
3004                                         //$noargs = true;
3005                                         //$noparse = true;
3006
3007                                         if ( is_array( $result ) ) {
3008                                                 if ( isset( $result[0] ) ) {
3009                                                         $text = $linestart . $result[0];
3010                                                         unset( $result[0] );
3011                                                 }
3012
3013                                                 // Extract flags into the local scope
3014                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
3015                                                 extract( $result );
3016                                         } else {
3017                                                 $text = $linestart . $result;
3018                                         }
3019                                 }
3020                         }
3021                         wfProfileOut( __METHOD__ . '-pfunc' );
3022                 }
3023
3024                 # Template table test
3025
3026                 # Did we encounter this template already? If yes, it is in the cache
3027                 # and we need to check for loops.
3028                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
3029                         $found = true;
3030
3031                         # Infinite loop test
3032                         if ( isset( $this->mTemplatePath[$part1] ) ) {
3033                                 $noparse = true;
3034                                 $noargs = true;
3035                                 $found = true;
3036                                 $text = $linestart .
3037                                         "[[$part1]]<!-- WARNING: template loop detected -->";
3038                                 wfDebug( __METHOD__.": template loop broken at '$part1'\n" );
3039                         } else {
3040                                 # set $text to cached message.
3041                                 $text = $linestart . $this->mTemplates[$piece['title']];
3042                                 #treat title for cached page the same as others
3043                                 $ns = NS_TEMPLATE;
3044                                 $subpage = '';
3045                                 $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3046                                 if ($subpage !== '') {
3047                                   $ns = $this->mTitle->getNamespace();
3048                                 }
3049                                 $title = Title::newFromText( $part1, $ns );
3050                                 //used by include size checking
3051                                 $titleText = $title->getPrefixedText();
3052                                 //used by edit section links
3053                                 $replaceHeadings = true;
3054
3055                         }
3056                 }
3057
3058                 # Load from database
3059                 if ( !$found ) {
3060                         wfProfileIn( __METHOD__ . '-loadtpl' );
3061                         $ns = NS_TEMPLATE;
3062                         # declaring $subpage directly in the function call
3063                         # does not work correctly with references and breaks
3064                         # {{/subpage}}-style inclusions
3065                         $subpage = '';
3066                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3067                         if ($subpage !== '') {
3068                                 $ns = $this->mTitle->getNamespace();
3069                         }
3070                         $title = Title::newFromText( $part1, $ns );
3071
3072
3073                         if ( !is_null( $title ) ) {
3074                                 $titleText = $title->getPrefixedText();
3075                                 # Check for language variants if the template is not found
3076                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
3077                                         $wgContLang->findVariantLink($part1, $title);
3078                                 }
3079
3080                                 if ( !$title->isExternal() ) {
3081                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
3082                                                 $text = SpecialPage::capturePath( $title );
3083                                                 if ( is_string( $text ) ) {
3084                                                         $found = true;
3085                                                         $noparse = true;
3086                                                         $noargs = true;
3087                                                         $isHTML = true;
3088                                                         $this->disableCache();
3089                                                 }
3090                                         } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3091                                                 $found = false; //access denied
3092                                                 wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
3093                                         } else {
3094                                                 list($articleContent,$title) = $this->fetchTemplateAndtitle( $title );
3095                                                 if ( $articleContent !== false ) {
3096                                                         $found = true;
3097                                                         $text = $articleContent;
3098                                                         $replaceHeadings = true;
3099                                                 }
3100                                         }
3101
3102                                         # If the title is valid but undisplayable, make a link to it
3103                                         if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3104                                                 $text = "[[:$titleText]]";
3105                                                 $found = true;
3106                                         }
3107                                 } elseif ( $title->isTrans() ) {
3108                                         // Interwiki transclusion
3109                                         if ( $this->ot['html'] && !$forceRawInterwiki ) {
3110                                                 $text = $this->interwikiTransclude( $title, 'render' );
3111                                                 $isHTML = true;
3112                                                 $noparse = true;
3113                                         } else {
3114                                                 $text = $this->interwikiTransclude( $title, 'raw' );
3115                                                 $replaceHeadings = true;
3116                                         }
3117                                         $found = true;
3118                                 }
3119
3120                                 # Template cache array insertion
3121                                 # Use the original $piece['title'] not the mangled $part1, so that
3122                                 # modifiers such as RAW: produce separate cache entries
3123                                 if( $found ) {
3124                                         if( $isHTML ) {
3125                                                 // A special page; don't store it in the template cache.
3126                                         } else {
3127                                                 $this->mTemplates[$piece['title']] = $text;
3128                                         }
3129                                         $text = $linestart . $text;
3130                                 }
3131                         }
3132                         wfProfileOut( __METHOD__ . '-loadtpl' );
3133                 }
3134
3135                 if ( $found && !$this->incrementIncludeSize( 'pre-expand', strlen( $text ) ) ) {
3136                         # Error, oversize inclusion
3137                         $text = $linestart .
3138                                 "[[$titleText]]<!-- WARNING: template omitted, pre-expand include size too large -->";
3139                         $noparse = true;
3140                         $noargs = true;
3141                 }
3142
3143                 # Recursive parsing, escaping and link table handling
3144                 # Only for HTML output
3145                 if ( $nowiki && $found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3146                         $text = wfEscapeWikiText( $text );
3147                 } elseif ( !$this->ot['msg'] && $found ) {
3148                         if ( $noargs ) {
3149                                 $assocArgs = array();
3150                         } else {
3151                                 # Clean up argument array
3152                                 $assocArgs = self::createAssocArgs($args);
3153                                 # Add a new element to the templace recursion path
3154                                 $this->mTemplatePath[$part1] = 1;
3155                         }
3156
3157                         if ( !$noparse ) {
3158                                 # If there are any <onlyinclude> tags, only include them
3159                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
3160                                         $replacer = new OnlyIncludeReplacer;
3161                                         StringUtils::delimiterReplaceCallback( '<onlyinclude>', '</onlyinclude>',
3162                                                 array( &$replacer, 'replace' ), $text );
3163                                         $text = $replacer->output;
3164                                 }
3165                                 # Remove <noinclude> sections and <includeonly> tags
3166                                 $text = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $text );
3167                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
3168
3169                                 if( $this->ot['html'] || $this->ot['pre'] ) {
3170                                         # Strip <nowiki>, <pre>, etc.
3171                                         $text = $this->strip( $text, $this->mStripState );
3172                                         if ( $this->ot['html'] ) {
3173                                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
3174                                         } elseif ( $this->ot['pre'] && $this->mOptions->getRemoveComments() ) {
3175                                                 $text = Sanitizer::removeHTMLcomments( $text );
3176                                         }
3177                                 }
3178                                 $text = $this->replaceVariables( $text, $assocArgs );
3179
3180                                 # If the template begins with a table or block-level
3181                                 # element, it should be treated as beginning a new line.
3182                                 if (!$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3183                                         $text = "\n" . $text;
3184                                 }
3185                         } elseif ( !$noargs ) {
3186                                 # $noparse and !$noargs
3187                                 # Just replace the arguments, not any double-brace items
3188                                 # This is used for rendered interwiki transclusion
3189                                 $text = $this->replaceVariables( $text, $assocArgs, true );
3190                         }
3191                 }
3192                 # Prune lower levels off the recursion check path
3193                 $this->mTemplatePath = $lastPathLevel;
3194
3195                 if ( $found && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3196                         # Error, oversize inclusion
3197                         $text = $linestart .
3198                                 "[[$titleText]]<!-- WARNING: template omitted, post-expand include size too large -->";
3199                         $noparse = true;
3200                         $noargs = true;
3201                 }
3202
3203                 if ( !$found ) {
3204                         wfProfileOut( $fname );
3205                         return $piece['text'];
3206                 } else {
3207                         wfProfileIn( __METHOD__ . '-placeholders' );
3208                         if ( $isHTML ) {
3209                                 # Replace raw HTML by a placeholder
3210                                 # Add a blank line preceding, to prevent it from mucking up
3211                                 # immediately preceding headings
3212                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
3213                         } else {
3214                                 # replace ==section headers==
3215                                 # XXX this needs to go away once we have a better parser.
3216                                 if ( !$this->ot['wiki'] && !$this->ot['pre'] && $replaceHeadings ) {
3217                                         if( !is_null( $title ) )
3218                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3219                                         else
3220                                                 $encodedname = base64_encode("");
3221                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3222                                                 PREG_SPLIT_DELIM_CAPTURE);
3223                                         $text = '';
3224                                         $nsec = $headingOffset;
3225
3226                                         for( $i = 0; $i < count($m); $i += 2 ) {
3227                                                 $text .= $m[$i];
3228                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3229                                                 $hl = $m[$i + 1];
3230                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3231                                                         $text .= $hl;
3232                                                         continue;
3233                                                 }
3234                                                 $m2 = array();
3235                                                 preg_match('/^(={1,6})(.*?)(={1,6}\s*?)$/m', $hl, $m2);
3236                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3237                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3238
3239                                                 $nsec++;
3240                                         }
3241                                 }
3242                         }
3243                         wfProfileOut( __METHOD__ . '-placeholders' );
3244                 }
3245
3246                 # Prune lower levels off the recursion check path
3247                 $this->mTemplatePath = $lastPathLevel;
3248
3249                 if ( !$found ) {
3250                         wfProfileOut( $fname );
3251                         return $piece['text'];
3252                 } else {
3253                         wfProfileOut( $fname );
3254                         return $text;
3255                 }
3256         }
3257
3258         /**
3259          * Fetch the unparsed text of a template and register a reference to it.
3260          */
3261         function fetchTemplateAndTitle( $title ) {
3262                 $templateCb = $this->mOptions->getTemplateCallback();
3263                 $stuff = call_user_func( $templateCb, $title );
3264                 $text = $stuff['text'];
3265                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3266                 if ( isset( $stuff['deps'] ) ) {
3267                         foreach ( $stuff['deps'] as $dep ) {
3268                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3269                         }
3270                 }
3271                 return array($text,$finalTitle);
3272         }
3273
3274         function fetchTemplate( $title ) {
3275                 $rv = $this->fetchTemplateAndtitle($title);
3276                 return $rv[0];
3277         }
3278
3279         /**
3280          * Static function to get a template
3281          * Can be overridden via ParserOptions::setTemplateCallback().
3282          *
3283          * Returns an associative array:
3284          *    text          The unparsed template text
3285          *    finalTitle    (Optional) The title after following redirects
3286          *    deps          (Optional) An array of associative array dependencies:
3287          *                       title:    The dependency title, to be registered in templatelinks
3288          *                       page_id:  The page_id of the title
3289          *                       rev_id:   The revision ID loaded
3290          */
3291         static function statelessFetchTemplate( $title ) {
3292                 $text = $skip = false;
3293                 $finalTitle = $title;
3294                 $deps = array();
3295
3296                 // Loop to fetch the article, with up to 1 redirect
3297                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3298                         # Give extensions a chance to select the revision instead
3299                         $id = false; // Assume current
3300                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( false, &$title, &$skip, &$id ) );
3301
3302                         if( $skip ) {
3303                                 $text = false;
3304                                 $deps[] = array(
3305                                         'title' => $title,
3306                                         'page_id' => $title->getArticleID(),
3307                                         'rev_id' => null );
3308                                 break;
3309                         }
3310                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3311                         $rev_id = $rev ? $rev->getId() : 0;
3312
3313                         $deps[] = array(
3314                                 'title' => $title,
3315                                 'page_id' => $title->getArticleID(),
3316                                 'rev_id' => $rev_id );
3317
3318                         if( $rev ) {
3319                                 $text = $rev->getText();
3320                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3321                                 global $wgLang;
3322                                 $message = $wgLang->lcfirst( $title->getText() );
3323                                 $text = wfMsgForContentNoTrans( $message );
3324                                 if( wfEmptyMsg( $message, $text ) ) {
3325                                         $text = false;
3326                                         break;
3327                                 }
3328                         } else {
3329                                 break;
3330                         }
3331                         if ( $text === false ) {
3332                                 break;
3333                         }
3334                         // Redirect?
3335                         $finalTitle = $title;
3336                         $title = Title::newFromRedirect( $text );
3337                 }
3338                 return array(
3339                         'text' => $text,
3340                         'finalTitle' => $finalTitle,
3341                         'deps' => $deps );
3342         }
3343
3344         /**
3345          * Transclude an interwiki link.
3346          */
3347         function interwikiTransclude( $title, $action ) {
3348                 global $wgEnableScaryTranscluding;
3349
3350                 if (!$wgEnableScaryTranscluding)
3351                         return wfMsg('scarytranscludedisabled');
3352
3353                 $url = $title->getFullUrl( "action=$action" );
3354
3355                 if (strlen($url) > 255)
3356                         return wfMsg('scarytranscludetoolong');
3357                 return $this->fetchScaryTemplateMaybeFromCache($url);
3358         }
3359
3360         function fetchScaryTemplateMaybeFromCache($url) {
3361                 global $wgTranscludeCacheExpiry;
3362                 $dbr = wfGetDB(DB_SLAVE);
3363                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3364                                 array('tc_url' => $url));
3365                 if ($obj) {
3366                         $time = $obj->tc_time;
3367                         $text = $obj->tc_contents;
3368                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3369                                 return $text;
3370                         }
3371                 }
3372
3373                 $text = Http::get($url);
3374                 if (!$text)
3375                         return wfMsg('scarytranscludefailed', $url);
3376
3377                 $dbw = wfGetDB(DB_MASTER);
3378                 $dbw->replace('transcache', array('tc_url'), array(
3379                         'tc_url' => $url,
3380                         'tc_time' => time(),
3381                         'tc_contents' => $text));
3382                 return $text;
3383         }
3384
3385
3386         /**
3387          * Triple brace replacement -- used for template arguments
3388          * @private
3389          */
3390         function argSubstitution( $matches ) {
3391                 $arg = trim( $matches['title'] );
3392                 $text = $matches['text'];
3393                 $inputArgs = end( $this->mArgStack );
3394
3395                 if ( array_key_exists( $arg, $inputArgs ) ) {
3396                         $text = $inputArgs[$arg];
3397                 } else if (($this->mOutputType == self::OT_HTML || $this->mOutputType == self::OT_PREPROCESS ) &&
3398                 null != $matches['parts'] && count($matches['parts']) > 0) {
3399                         $text = $matches['parts'][0];
3400                 }
3401                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3402                         $text = $matches['text'] .
3403                                 '<!-- WARNING: argument omitted, expansion size too large -->';
3404                 }
3405
3406                 return $text;
3407         }
3408
3409         /**
3410          * Increment an include size counter
3411          *
3412          * @param string $type The type of expansion
3413          * @param integer $size The size of the text
3414          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3415          */
3416         function incrementIncludeSize( $type, $size ) {
3417                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3418                         return false;
3419                 } else {
3420                         $this->mIncludeSizes[$type] += $size;
3421                         return true;
3422                 }
3423         }
3424
3425         /**
3426          * Detect __NOGALLERY__ magic word and set a placeholder
3427          */
3428         function stripNoGallery( &$text ) {
3429                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3430                 # do not add TOC
3431                 $mw = MagicWord::get( 'nogallery' );
3432                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3433         }
3434
3435         /**
3436          * Find the first __TOC__ magic word and set a <!--MWTOC-->
3437          * placeholder that will then be replaced by the real TOC in
3438          * ->formatHeadings, this works because at this points real
3439          * comments will have already been discarded by the sanitizer.
3440          *
3441          * Any additional __TOC__ magic words left over will be discarded
3442          * as there can only be one TOC on the page.
3443          */
3444         function stripToc( $text ) {
3445                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3446                 # do not add TOC
3447                 $mw = MagicWord::get( 'notoc' );
3448                 if( $mw->matchAndRemove( $text ) ) {
3449                         $this->mShowToc = false;
3450                 }
3451
3452                 $mw = MagicWord::get( 'toc' );
3453                 if( $mw->match( $text ) ) {
3454                         $this->mShowToc = true;
3455                         $this->mForceTocPosition = true;
3456
3457                         // Set a placeholder. At the end we'll fill it in with the TOC.
3458                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3459
3460                         // Only keep the first one.
3461                         $text = $mw->replace( '', $text );
3462                 }
3463                 return $text;
3464         }
3465
3466         /**
3467          * This function accomplishes several tasks:
3468          * 1) Auto-number headings if that option is enabled
3469          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3470          * 3) Add a Table of contents on the top for users who have enabled the option
3471          * 4) Auto-anchor headings
3472          *
3473          * It loops through all headlines, collects the necessary data, then splits up the
3474          * string and re-inserts the newly formatted headlines.
3475          *
3476          * @param string $text
3477          * @param boolean $isMain
3478          * @private
3479          */
3480         function formatHeadings( $text, $isMain=true ) {
3481                 global $wgMaxTocLevel, $wgContLang;
3482
3483                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3484                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3485                         $showEditLink = 0;
3486                 } else {
3487                         $showEditLink = $this->mOptions->getEditSection();
3488                 }
3489
3490                 # Inhibit editsection links if requested in the page
3491                 $esw =& MagicWord::get( 'noeditsection' );
3492                 if( $esw->matchAndRemove( $text ) ) {
3493                         $showEditLink = 0;
3494                 }
3495
3496                 # Get all headlines for numbering them and adding funky stuff like [edit]
3497                 # links - this is for later, but we need the number of headlines right now
3498                 $matches = array();
3499                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3500
3501                 # if there are fewer than 4 headlines in the article, do not show TOC
3502                 # unless it's been explicitly enabled.
3503                 $enoughToc = $this->mShowToc &&
3504                         (($numMatches >= 4) || $this->mForceTocPosition);
3505
3506                 # Allow user to stipulate that a page should have a "new section"
3507                 # link added via __NEWSECTIONLINK__
3508                 $mw =& MagicWord::get( 'newsectionlink' );
3509                 if( $mw->matchAndRemove( $text ) )
3510                         $this->mOutput->setNewSection( true );
3511
3512                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3513                 # override above conditions and always show TOC above first header
3514                 $mw =& MagicWord::get( 'forcetoc' );
3515                 if ($mw->matchAndRemove( $text ) ) {
3516                         $this->mShowToc = true;
3517                         $enoughToc = true;
3518                 }
3519
3520                 # We need this to perform operations on the HTML
3521                 $sk = $this->mOptions->getSkin();
3522
3523                 # headline counter
3524                 $headlineCount = 0;
3525                 $sectionCount = 0; # headlineCount excluding template sections
3526                 $numVisible = 0;
3527
3528                 # Ugh .. the TOC should have neat indentation levels which can be
3529                 # passed to the skin functions. These are determined here
3530                 $toc = '';
3531                 $full = '';
3532                 $head = array();
3533                 $sublevelCount = array();
3534                 $levelCount = array();
3535                 $toclevel = 0;
3536                 $level = 0;
3537                 $prevlevel = 0;
3538                 $toclevel = 0;
3539                 $prevtoclevel = 0;
3540                 $tocraw = array();
3541
3542                 foreach( $matches[3] as $headline ) {
3543                         $istemplate = 0;
3544                         $templatetitle = '';
3545                         $templatesection = 0;
3546                         $numbering = '';
3547                         $mat = array();
3548                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3549                                 $istemplate = 1;
3550                                 $templatetitle = base64_decode($mat[1]);
3551                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3552                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3553                         }
3554
3555                         if( $toclevel ) {
3556                                 $prevlevel = $level;
3557                                 $prevtoclevel = $toclevel;
3558                         }
3559                         $level = $matches[1][$headlineCount];
3560
3561                         if( $doNumberHeadings || $enoughToc ) {
3562
3563                                 if ( $level > $prevlevel ) {
3564                                         # Increase TOC level
3565                                         $toclevel++;
3566                                         $sublevelCount[$toclevel] = 0;
3567                                         if( $toclevel<$wgMaxTocLevel ) {
3568                                                 $prevtoclevel = $toclevel;
3569                                                 $toc .= $sk->tocIndent();
3570                                                 $numVisible++;
3571                                         }
3572                                 }
3573                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3574                                         # Decrease TOC level, find level to jump to
3575
3576                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3577                                                 # Can only go down to level 1
3578                                                 $toclevel = 1;
3579                                         } else {
3580                                                 for ($i = $toclevel; $i > 0; $i--) {
3581                                                         if ( $levelCount[$i] == $level ) {
3582                                                                 # Found last matching level
3583                                                                 $toclevel = $i;
3584                                                                 break;
3585                                                         }
3586                                                         elseif ( $levelCount[$i] < $level ) {
3587                                                                 # Found first matching level below current level
3588                                                                 $toclevel = $i + 1;
3589                                                                 break;
3590                                                         }
3591                                                 }
3592                                         }
3593                                         if( $toclevel<$wgMaxTocLevel ) {
3594                                                 if($prevtoclevel < $wgMaxTocLevel) {
3595                                                         # Unindent only if the previous toc level was shown :p
3596                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3597                                                 } else {
3598                                                         $toc .= $sk->tocLineEnd();
3599                                                 }
3600                                         }
3601                                 }
3602                                 else {
3603                                         # No change in level, end TOC line
3604                                         if( $toclevel<$wgMaxTocLevel ) {
3605                                                 $toc .= $sk->tocLineEnd();
3606                                         }
3607                                 }
3608
3609                                 $levelCount[$toclevel] = $level;
3610
3611                                 # count number of headlines for each level
3612                                 @$sublevelCount[$toclevel]++;
3613                                 $dot = 0;
3614                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3615                                         if( !empty( $sublevelCount[$i] ) ) {
3616                                                 if( $dot ) {
3617                                                         $numbering .= '.';
3618                                                 }
3619                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3620                                                 $dot = 1;
3621                                         }
3622                                 }
3623                         }
3624
3625                         # The canonized header is a version of the header text safe to use for links
3626                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3627                         $canonized_headline = $this->mStripState->unstripBoth( $headline );
3628
3629                         # Remove link placeholders by the link text.
3630                         #     <!--LINK number-->
3631                         # turns into
3632                         #     link text with suffix
3633                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3634                                                             "\$this->mLinkHolders['texts'][\$1]",
3635                                                             $canonized_headline );
3636                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3637                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3638                                                             $canonized_headline );
3639
3640                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3641                         $tocline = preg_replace(
3642                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3643                                 array( '',                          '<$1>'),
3644                                 $canonized_headline
3645                         );
3646                         $tocline = trim( $tocline );
3647
3648                         # For the anchor, strip out HTML-y stuff period
3649                         $canonized_headline = preg_replace( '/<.*?'.'>/', '', $canonized_headline );
3650                         $canonized_headline = trim( $canonized_headline );
3651
3652                         # Save headline for section edit hint before it's escaped
3653                         $headline_hint = $canonized_headline;
3654                         $canonized_headline = Sanitizer::escapeId( $canonized_headline );
3655                         $refers[$headlineCount] = $canonized_headline;
3656
3657                         # count how many in assoc. array so we can track dupes in anchors
3658                         isset( $refers[$canonized_headline] ) ? $refers[$canonized_headline]++ : $refers[$canonized_headline] = 1;
3659                         $refcount[$headlineCount]=$refers[$canonized_headline];
3660
3661                         # Don't number the heading if it is the only one (looks silly)
3662                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3663                                 # the two are different if the line contains a link
3664                                 $headline=$numbering . ' ' . $headline;
3665                         }
3666
3667                         # Create the anchor for linking from the TOC to the section
3668                         $anchor = $canonized_headline;
3669                         if($refcount[$headlineCount] > 1 ) {
3670                                 $anchor .= '_' . $refcount[$headlineCount];
3671                         }
3672                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3673                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3674                                 $tocraw[] = array( 'toclevel' => $toclevel, 'level' => $level, 'line' => $tocline, 'number' => $numbering );
3675                         }
3676                         # give headline the correct <h#> tag
3677                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3678                                 if( $istemplate )
3679                                         $editlink = $sk->editSectionLinkForOther($templatetitle, $templatesection);
3680                                 else
3681                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3682                         } else {
3683                                 $editlink = '';
3684                         }
3685                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3686
3687                         $headlineCount++;
3688                         if( !$istemplate )
3689                                 $sectionCount++;
3690                 }
3691
3692                 $this->mOutput->setSections( $tocraw );
3693
3694                 # Never ever show TOC if no headers
3695                 if( $numVisible < 1 ) {
3696                         $enoughToc = false;
3697                 }
3698
3699                 if( $enoughToc ) {
3700                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3701                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3702                         }
3703                         $toc = $sk->tocList( $toc );
3704                 }
3705
3706                 # split up and insert constructed headlines
3707
3708                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3709                 $i = 0;
3710
3711                 foreach( $blocks as $block ) {
3712                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3713                                 # This is the [edit] link that appears for the top block of text when
3714                                 # section editing is enabled
3715
3716                                 # Disabled because it broke block formatting
3717                                 # For example, a bullet point in the top line
3718                                 # $full .= $sk->editSectionLink(0);
3719                         }
3720                         $full .= $block;
3721                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3722                                 # Top anchor now in skin
3723                                 $full = $full.$toc;
3724                         }
3725
3726                         if( !empty( $head[$i] ) ) {
3727                                 $full .= $head[$i];
3728                         }
3729                         $i++;
3730                 }
3731                 if( $this->mForceTocPosition ) {
3732                         return str_replace( '<!--MWTOC-->', $toc, $full );
3733                 } else {
3734                         return $full;
3735                 }
3736         }
3737
3738         /**
3739          * Transform wiki markup when saving a page by doing \r\n -> \n
3740          * conversion, substitting signatures, {{subst:}} templates, etc.
3741          *
3742          * @param string $text the text to transform
3743          * @param Title &$title the Title object for the current article
3744          * @param User &$user the User object describing the current user
3745          * @param ParserOptions $options parsing options
3746          * @param bool $clearState whether to clear the parser state first
3747          * @return string the altered wiki markup
3748          * @public
3749          */
3750         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3751                 $this->mOptions = $options;
3752                 $this->mTitle =& $title;
3753                 $this->setOutputType( self::OT_WIKI );
3754
3755                 if ( $clearState ) {
3756                         $this->clearState();
3757                 }
3758
3759                 $stripState = new StripState;
3760                 $pairs = array(
3761                         "\r\n" => "\n",
3762                 );
3763                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3764                 $text = $this->strip( $text, $stripState, true, array( 'gallery' ) );
3765                 $text = $this->pstPass2( $text, $stripState, $user );
3766                 $text = $stripState->unstripBoth( $text );
3767                 return $text;
3768         }
3769
3770         /**
3771          * Pre-save transform helper function
3772          * @private
3773          */
3774         function pstPass2( $text, &$stripState, $user ) {
3775                 global $wgContLang, $wgLocaltimezone;
3776
3777                 /* Note: This is the timestamp saved as hardcoded wikitext to
3778                  * the database, we use $wgContLang here in order to give
3779                  * everyone the same signature and use the default one rather
3780                  * than the one selected in each user's preferences.
3781                  */
3782                 if ( isset( $wgLocaltimezone ) ) {
3783                         $oldtz = getenv( 'TZ' );
3784                         putenv( 'TZ='.$wgLocaltimezone );
3785                 }
3786                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3787                   ' (' . date( 'T' ) . ')';
3788                 if ( isset( $wgLocaltimezone ) ) {
3789                         putenv( 'TZ='.$oldtz );
3790                 }
3791
3792                 # Variable replacement
3793                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3794                 $text = $this->replaceVariables( $text );
3795
3796                 # Strip out <nowiki> etc. added via replaceVariables
3797                 $text = $this->strip( $text, $stripState, false, array( 'gallery' ) );
3798
3799                 # Signatures
3800                 $sigText = $this->getUserSig( $user );
3801                 $text = strtr( $text, array(
3802                         '~~~~~' => $d,
3803                         '~~~~' => "$sigText $d",
3804                         '~~~' => $sigText
3805                 ) );
3806
3807                 # Context links: [[|name]] and [[name (context)|]]
3808                 #
3809                 global $wgLegalTitleChars;
3810                 $tc = "[$wgLegalTitleChars]";
3811                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3812
3813                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3814                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3815                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3816
3817                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3818                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3819                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3820
3821                 $t = $this->mTitle->getText();
3822                 $m = array();
3823                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3824                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3825                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3826                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3827                 } else {
3828                         # if there's no context, don't bother duplicating the title
3829                         $text = preg_replace( $p2, '[[\\1]]', $text );
3830                 }
3831
3832                 # Trim trailing whitespace
3833                 $text = rtrim( $text );
3834
3835                 return $text;
3836         }
3837
3838         /**
3839          * Fetch the user's signature text, if any, and normalize to
3840          * validated, ready-to-insert wikitext.
3841          *
3842          * @param User $user
3843          * @return string
3844          * @private
3845          */
3846         function getUserSig( &$user ) {
3847                 global $wgMaxSigChars;
3848
3849                 $username = $user->getName();
3850                 $nickname = $user->getOption( 'nickname' );
3851                 $nickname = $nickname === '' ? $username : $nickname;
3852
3853                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
3854                         $nickname = $username;
3855                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
3856                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
3857                         # Sig. might contain markup; validate this
3858                         if( $this->validateSig( $nickname ) !== false ) {
3859                                 # Validated; clean up (if needed) and return it
3860                                 return $this->cleanSig( $nickname, true );
3861                         } else {
3862                                 # Failed to validate; fall back to the default
3863                                 $nickname = $username;
3864                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3865                         }
3866                 }
3867
3868                 // Make sure nickname doesnt get a sig in a sig
3869                 $nickname = $this->cleanSigInSig( $nickname );
3870
3871                 # If we're still here, make it a link to the user page
3872                 $userText = wfEscapeWikiText( $username );
3873                 $nickText = wfEscapeWikiText( $nickname );
3874                 if ( $user->isAnon() )  {
3875                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
3876                 } else {
3877                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
3878                 }
3879         }
3880
3881         /**
3882          * Check that the user's signature contains no bad XML
3883          *
3884          * @param string $text
3885          * @return mixed An expanded string, or false if invalid.
3886          */
3887         function validateSig( $text ) {
3888                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3889         }
3890
3891         /**
3892          * Clean up signature text
3893          *
3894          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3895          * 2) Substitute all transclusions
3896          *
3897          * @param string $text
3898          * @param $parsing Whether we're cleaning (preferences save) or parsing
3899          * @return string Signature text
3900          */
3901         function cleanSig( $text, $parsing = false ) {
3902                 global $wgTitle;
3903                 $this->startExternalParse( $this->mTitle, new ParserOptions(), $parsing ? self::OT_WIKI : self::OT_MSG );
3904
3905                 $substWord = MagicWord::get( 'subst' );
3906                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3907                 $substText = '{{' . $substWord->getSynonym( 0 );
3908
3909                 $text = preg_replace( $substRegex, $substText, $text );
3910                 $text = $this->cleanSigInSig( $text );
3911                 $text = $this->replaceVariables( $text );
3912
3913                 $this->clearState();
3914                 return $text;
3915         }
3916
3917         /**
3918          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3919          * @param string $text
3920          * @return string Signature text with /~{3,5}/ removed
3921          */
3922         function cleanSigInSig( $text ) {
3923                 $text = preg_replace( '/~{3,5}/', '', $text );
3924                 return $text;
3925         }
3926
3927         /**
3928          * Set up some variables which are usually set up in parse()
3929          * so that an external function can call some class members with confidence
3930          * @public
3931          */
3932         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3933                 $this->mTitle =& $title;
3934                 $this->mOptions = $options;
3935                 $this->setOutputType( $outputType );
3936                 if ( $clearState ) {
3937                         $this->clearState();
3938                 }
3939         }
3940
3941         /**
3942          * Transform a MediaWiki message by replacing magic variables.
3943          *
3944          * @param string $text the text to transform
3945          * @param ParserOptions $options  options
3946          * @return string the text with variables substituted
3947          * @public
3948          */
3949         function transformMsg( $text, $options ) {
3950                 global $wgTitle;
3951                 static $executing = false;
3952
3953                 $fname = "Parser::transformMsg";
3954
3955                 # Guard against infinite recursion
3956                 if ( $executing ) {
3957                         return $text;
3958                 }
3959                 $executing = true;
3960
3961                 wfProfileIn($fname);
3962
3963                 if ( $wgTitle && !( $wgTitle instanceof FakeTitle ) ) {
3964                         $this->mTitle = $wgTitle;
3965                 } else {
3966                         $this->mTitle = Title::newFromText('msg');
3967                 }
3968                 $this->mOptions = $options;
3969                 $this->setOutputType( self::OT_MSG );
3970                 $this->clearState();
3971                 $text = $this->replaceVariables( $text );
3972
3973                 $executing = false;
3974                 wfProfileOut($fname);
3975                 return $text;
3976         }
3977
3978         /**
3979          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3980          * The callback should have the following form:
3981          *    function myParserHook( $text, $params, &$parser ) { ... }
3982          *
3983          * Transform and return $text. Use $parser for any required context, e.g. use
3984          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3985          *
3986          * @public
3987          *
3988          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3989          * @param mixed $callback The callback function (and object) to use for the tag
3990          *
3991          * @return The old value of the mTagHooks array associated with the hook
3992          */
3993         function setHook( $tag, $callback ) {
3994                 $tag = strtolower( $tag );
3995                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3996                 $this->mTagHooks[$tag] = $callback;
3997
3998                 return $oldVal;
3999         }
4000
4001         function setTransparentTagHook( $tag, $callback ) {
4002                 $tag = strtolower( $tag );
4003                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4004                 $this->mTransparentTagHooks[$tag] = $callback;
4005
4006                 return $oldVal;
4007         }
4008
4009         /**
4010          * Create a function, e.g. {{sum:1|2|3}}
4011          * The callback function should have the form:
4012          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4013          *
4014          * The callback may either return the text result of the function, or an array with the text
4015          * in element 0, and a number of flags in the other elements. The names of the flags are
4016          * specified in the keys. Valid flags are:
4017          *   found                     The text returned is valid, stop processing the template. This
4018          *                             is on by default.
4019          *   nowiki                    Wiki markup in the return value should be escaped
4020          *   noparse                   Unsafe HTML tags should not be stripped, etc.
4021          *   noargs                    Don't replace triple-brace arguments in the return value
4022          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4023          *
4024          * @public
4025          *
4026          * @param string $id The magic word ID
4027          * @param mixed $callback The callback function (and object) to use
4028          * @param integer $flags a combination of the following flags:
4029          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4030          *
4031          * @return The old callback function for this name, if any
4032          */
4033         function setFunctionHook( $id, $callback, $flags = 0 ) {
4034                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id] : null;
4035                 $this->mFunctionHooks[$id] = $callback;
4036
4037                 # Add to function cache
4038                 $mw = MagicWord::get( $id );
4039                 if( !$mw )
4040                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
4041
4042                 $synonyms = $mw->getSynonyms();
4043                 $sensitive = intval( $mw->isCaseSensitive() );
4044
4045                 foreach ( $synonyms as $syn ) {
4046                         # Case
4047                         if ( !$sensitive ) {
4048                                 $syn = strtolower( $syn );
4049                         }
4050                         # Add leading hash
4051                         if ( !( $flags & SFH_NO_HASH ) ) {
4052                                 $syn = '#' . $syn;
4053                         }
4054                         # Remove trailing colon
4055                         if ( substr( $syn, -1, 1 ) == ':' ) {
4056                                 $syn = substr( $syn, 0, -1 );
4057                         }
4058                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4059                 }
4060                 return $oldVal;
4061         }
4062
4063         /**
4064          * Get all registered function hook identifiers
4065          *
4066          * @return array
4067          */
4068         function getFunctionHooks() {
4069                 return array_keys( $this->mFunctionHooks );
4070         }
4071
4072         /**
4073          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4074          * Placeholders created in Skin::makeLinkObj()
4075          * Returns an array of links found, indexed by PDBK:
4076          *  0 - broken
4077          *  1 - normal link
4078          *  2 - stub
4079          * $options is a bit field, RLH_FOR_UPDATE to select for update
4080          */
4081         function replaceLinkHolders( &$text, $options = 0 ) {
4082                 global $wgUser;
4083                 global $wgContLang;
4084
4085                 $fname = 'Parser::replaceLinkHolders';
4086                 wfProfileIn( $fname );
4087
4088                 $pdbks = array();
4089                 $colours = array();
4090                 $sk = $this->mOptions->getSkin();
4091                 $linkCache = LinkCache::singleton();
4092
4093                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
4094                         wfProfileIn( $fname.'-check' );
4095                         $dbr = wfGetDB( DB_SLAVE );
4096                         $page = $dbr->tableName( 'page' );
4097                         $threshold = $wgUser->getOption('stubthreshold');
4098
4099                         # Sort by namespace
4100                         asort( $this->mLinkHolders['namespaces'] );
4101
4102                         # Generate query
4103                         $query = false;
4104                         $current = null;
4105                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4106                                 # Make title object
4107                                 $title = $this->mLinkHolders['titles'][$key];
4108
4109                                 # Skip invalid entries.
4110                                 # Result will be ugly, but prevents crash.
4111                                 if ( is_null( $title ) ) {
4112                                         continue;
4113                                 }
4114                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
4115
4116                                 # Check if it's a static known link, e.g. interwiki
4117                                 if ( $title->isAlwaysKnown() ) {
4118                                         $colours[$pdbk] = 1;
4119                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
4120                                         $colours[$pdbk] = 1;
4121                                         $this->mOutput->addLink( $title, $id );
4122                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
4123                                         $colours[$pdbk] = 0;
4124                                 } elseif ( $title->getNamespace() == NS_SPECIAL && !SpecialPage::exists( $pdbk ) ) {
4125                                         $colours[$pdbk] = 0;
4126                                 } else {
4127                                         # Not in the link cache, add it to the query
4128                                         if ( !isset( $current ) ) {
4129                                                 $current = $ns;
4130                                                 $query =  "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect";
4131                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
4132                                         } elseif ( $current != $ns ) {
4133                                                 $current = $ns;
4134                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4135                                         } else {
4136                                                 $query .= ', ';
4137                                         }
4138
4139                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4140                                 }
4141                         }
4142                         if ( $query ) {
4143                                 $query .= '))';
4144                                 if ( $options & RLH_FOR_UPDATE ) {
4145                                         $query .= ' FOR UPDATE';
4146                                 }
4147
4148                                 $res = $dbr->query( $query, $fname );
4149
4150                                 # Fetch data and form into an associative array
4151                                 # non-existent = broken
4152                                 # 1 = known
4153                                 # 2 = stub
4154                                 while ( $s = $dbr->fetchObject($res) ) {
4155                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4156                                         $pdbk = $title->getPrefixedDBkey();
4157                                         $linkCache->addGoodLinkObj( $s->page_id, $title, $s->page_len, $s->page_is_redirect );
4158                                         $this->mOutput->addLink( $title, $s->page_id );
4159
4160                                         $colours[$pdbk] = ( $threshold == 0 || (
4161                                                                 $s->page_len >= $threshold || # always true if $threshold <= 0
4162                                                                 $s->page_is_redirect ||
4163                                                                 !MWNamespace::isContent( $s->page_namespace ) )
4164                                                             ? 1 : 2 );
4165                                 }
4166                         }
4167                         wfProfileOut( $fname.'-check' );
4168
4169                         # Do a second query for different language variants of links and categories
4170                         if( $wgContLang->hasVariants() ) {
4171                                 $linkBatch = new LinkBatch();
4172                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4173                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4174                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4175
4176                                 $categories = $this->mOutput->getCategoryLinks();
4177
4178                                 // Add variants of links to link batch
4179                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4180                                         $title = $this->mLinkHolders['titles'][$key];
4181                                         if ( is_null( $title ) )
4182                                                 continue;
4183
4184                                         $pdbk = $title->getPrefixedDBkey();
4185                                         $titleText = $title->getText();
4186
4187                                         // generate all variants of the link title text
4188                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4189
4190                                         // if link was not found (in first query), add all variants to query
4191                                         if ( !isset($colours[$pdbk]) ){
4192                                                 foreach($allTextVariants as $textVariant){
4193                                                         if($textVariant != $titleText){
4194                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4195                                                                 if(is_null($variantTitle)) continue;
4196                                                                 $linkBatch->addObj( $variantTitle );
4197                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4198                                                         }
4199                                                 }
4200                                         }
4201                                 }
4202
4203                                 // process categories, check if a category exists in some variant
4204                                 foreach( $categories as $category ){
4205                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4206                                         foreach($variants as $variant){
4207                                                 if($variant != $category){
4208                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4209                                                         if(is_null($variantTitle)) continue;
4210                                                         $linkBatch->addObj( $variantTitle );
4211                                                         $categoryMap[$variant] = $category;
4212                                                 }
4213                                         }
4214                                 }
4215
4216
4217                                 if ( !$linkBatch->isEmpty() ){
4218                                         // construct query
4219                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4220
4221                                         $variantQuery =  "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect";
4222
4223                                         $variantQuery .= " FROM $page WHERE $titleClause";
4224                                         if ( $options & RLH_FOR_UPDATE ) {
4225                                                 $variantQuery .= ' FOR UPDATE';
4226                                         }
4227
4228                                         $varRes = $dbr->query( $variantQuery, $fname );
4229
4230                                         // for each found variants, figure out link holders and replace
4231                                         while ( $s = $dbr->fetchObject($varRes) ) {
4232
4233                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4234                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4235                                                 $vardbk = $variantTitle->getDBkey();
4236
4237                                                 $holderKeys = array();
4238                                                 if(isset($variantMap[$varPdbk])){
4239                                                         $holderKeys = $variantMap[$varPdbk];
4240                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle, $s->page_len, $s->page_is_redirect );
4241                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4242                                                 }
4243
4244                                                 // loop over link holders
4245                                                 foreach($holderKeys as $key){
4246                                                         $title = $this->mLinkHolders['titles'][$key];
4247                                                         if ( is_null( $title ) ) continue;
4248
4249                                                         $pdbk = $title->getPrefixedDBkey();
4250
4251                                                         if(!isset($colours[$pdbk])){
4252                                                                 // found link in some of the variants, replace the link holder data
4253                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4254                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4255
4256                                                                 // set pdbk and colour
4257                                                                 $pdbks[$key] = $varPdbk;
4258                                                                 if ( $threshold >  0 ) {
4259                                                                         $size = $s->page_len;
4260                                                                         if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4261                                                                                 $colours[$varPdbk] = 1;
4262                                                                         } else {
4263                                                                                 $colours[$varPdbk] = 2;
4264                                                                         }
4265                                                                 }
4266                                                                 else {
4267                                                                         $colours[$varPdbk] = 1;
4268                                                                 }
4269                                                         }
4270                                                 }
4271
4272                                                 // check if the object is a variant of a category
4273                                                 if(isset($categoryMap[$vardbk])){
4274                                                         $oldkey = $categoryMap[$vardbk];
4275                                                         if($oldkey != $vardbk)
4276                                                                 $varCategories[$oldkey]=$vardbk;
4277                                                 }
4278                                         }
4279
4280                                         // rebuild the categories in original order (if there are replacements)
4281                                         if(count($varCategories)>0){
4282                                                 $newCats = array();
4283                                                 $originalCats = $this->mOutput->getCategories();
4284                                                 foreach($originalCats as $cat => $sortkey){
4285                                                         // make the replacement
4286                                                         if( array_key_exists($cat,$varCategories) )
4287                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4288                                                         else $newCats[$cat] = $sortkey;
4289                                                 }
4290                                                 $this->mOutput->setCategoryLinks($newCats);
4291                                         }
4292                                 }
4293                         }
4294
4295                         # Construct search and replace arrays
4296                         wfProfileIn( $fname.'-construct' );
4297                         $replacePairs = array();
4298                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4299                                 $pdbk = $pdbks[$key];
4300                                 $searchkey = "<!--LINK $key-->";
4301                                 $title = $this->mLinkHolders['titles'][$key];
4302                                 if ( empty( $colours[$pdbk] ) ) {
4303                                         $linkCache->addBadLinkObj( $title );
4304                                         $colours[$pdbk] = 0;
4305                                         $this->mOutput->addLink( $title, 0 );
4306                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4307                                                                         $this->mLinkHolders['texts'][$key],
4308                                                                         $this->mLinkHolders['queries'][$key] );
4309                                 } elseif ( $colours[$pdbk] == 1 ) {
4310                                         $replacePairs[$searchkey] = $sk->makeKnownLinkObj( $title,
4311                                                                         $this->mLinkHolders['texts'][$key],
4312                                                                         $this->mLinkHolders['queries'][$key] );
4313                                 } elseif ( $colours[$pdbk] == 2 ) {
4314                                         $replacePairs[$searchkey] = $sk->makeStubLinkObj( $title,
4315                                                                         $this->mLinkHolders['texts'][$key],
4316                                                                         $this->mLinkHolders['queries'][$key] );
4317                                 }
4318                         }
4319                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4320                         wfProfileOut( $fname.'-construct' );
4321
4322                         # Do the thing
4323                         wfProfileIn( $fname.'-replace' );
4324                         $text = preg_replace_callback(
4325                                 '/(<!--LINK .*?-->)/',
4326                                 $replacer->cb(),
4327                                 $text);
4328
4329                         wfProfileOut( $fname.'-replace' );
4330                 }
4331
4332                 # Now process interwiki link holders
4333                 # This is quite a bit simpler than internal links
4334                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4335                         wfProfileIn( $fname.'-interwiki' );
4336                         # Make interwiki link HTML
4337                         $replacePairs = array();
4338                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4339                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4340                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4341                         }
4342                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4343
4344                         $text = preg_replace_callback(
4345                                 '/<!--IWLINK (.*?)-->/',
4346                                 $replacer->cb(),
4347                                 $text );
4348                         wfProfileOut( $fname.'-interwiki' );
4349                 }
4350
4351                 wfProfileOut( $fname );
4352                 return $colours;
4353         }
4354
4355         /**
4356          * Replace <!--LINK--> link placeholders with plain text of links
4357          * (not HTML-formatted).
4358          * @param string $text
4359          * @return string
4360          */
4361         function replaceLinkHoldersText( $text ) {
4362                 $fname = 'Parser::replaceLinkHoldersText';
4363                 wfProfileIn( $fname );
4364
4365                 $text = preg_replace_callback(
4366                         '/<!--(LINK|IWLINK) (.*?)-->/',
4367                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4368                         $text );
4369
4370                 wfProfileOut( $fname );
4371                 return $text;
4372         }
4373
4374         /**
4375          * @param array $matches
4376          * @return string
4377          * @private
4378          */
4379         function replaceLinkHoldersTextCallback( $matches ) {
4380                 $type = $matches[1];
4381                 $key  = $matches[2];
4382                 if( $type == 'LINK' ) {
4383                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4384                                 return $this->mLinkHolders['texts'][$key];
4385                         }
4386                 } elseif( $type == 'IWLINK' ) {
4387                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4388                                 return $this->mInterwikiLinkHolders['texts'][$key];
4389                         }
4390                 }
4391                 return $matches[0];
4392         }
4393
4394         /**
4395          * Tag hook handler for 'pre'.
4396          */
4397         function renderPreTag( $text, $attribs ) {
4398                 // Backwards-compatibility hack
4399                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4400
4401                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4402                 return wfOpenElement( 'pre', $attribs ) .
4403                         Xml::escapeTagsOnly( $content ) .
4404                         '</pre>';
4405         }
4406
4407         /**
4408          * Renders an image gallery from a text with one line per image.
4409          * text labels may be given by using |-style alternative text. E.g.
4410          *   Image:one.jpg|The number "1"
4411          *   Image:tree.jpg|A tree
4412          * given as text will return the HTML of a gallery with two images,
4413          * labeled 'The number "1"' and
4414          * 'A tree'.
4415          */
4416         function renderImageGallery( $text, $params ) {
4417                 $ig = new ImageGallery();
4418                 $ig->setContextTitle( $this->mTitle );
4419                 $ig->setShowBytes( false );
4420                 $ig->setShowFilename( false );
4421                 $ig->setParser( $this );
4422                 $ig->setHideBadImages();
4423                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4424                 $ig->useSkin( $this->mOptions->getSkin() );
4425                 $ig->mRevisionId = $this->mRevisionId;
4426
4427                 if( isset( $params['caption'] ) ) {
4428                         $caption = $params['caption'];
4429                         $caption = htmlspecialchars( $caption );
4430                         $caption = $this->replaceInternalLinks( $caption );
4431                         $ig->setCaptionHtml( $caption );
4432                 }
4433                 if( isset( $params['perrow'] ) ) {
4434                         $ig->setPerRow( $params['perrow'] );
4435                 }
4436                 if( isset( $params['widths'] ) ) {
4437                         $ig->setWidths( $params['widths'] );
4438                 }
4439                 if( isset( $params['heights'] ) ) {
4440                         $ig->setHeights( $params['heights'] );
4441                 }
4442
4443                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4444
4445                 $lines = explode( "\n", $text );
4446                 foreach ( $lines as $line ) {
4447                         # match lines like these:
4448                         # Image:someimage.jpg|This is some image
4449                         $matches = array();
4450                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4451                         # Skip empty lines
4452                         if ( count( $matches ) == 0 ) {
4453                                 continue;
4454                         }
4455                         $tp = Title::newFromText( $matches[1] );
4456                         $nt =& $tp;
4457                         if( is_null( $nt ) ) {
4458                                 # Bogus title. Ignore these so we don't bomb out later.
4459                                 continue;
4460                         }
4461                         if ( isset( $matches[3] ) ) {
4462                                 $label = $matches[3];
4463                         } else {
4464                                 $label = '';
4465                         }
4466
4467                         $pout = $this->parse( $label,
4468                                 $this->mTitle,
4469                                 $this->mOptions,
4470                                 false, // Strip whitespace...?
4471                                 false  // Don't clear state!
4472                         );
4473                         $html = $pout->getText();
4474
4475                         $ig->add( $nt, $html );
4476
4477                         # Only add real images (bug #5586)
4478                         if ( $nt->getNamespace() == NS_IMAGE ) {
4479                                 $this->mOutput->addImage( $nt->getDBkey() );
4480                         }
4481                 }
4482                 return $ig->toHTML();
4483         }
4484
4485         function getImageParams( $handler ) {
4486                 if ( $handler ) {
4487                         $handlerClass = get_class( $handler );
4488                 } else {
4489                         $handlerClass = '';
4490                 }
4491                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4492                         // Initialise static lists
4493                         static $internalParamNames = array(
4494                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4495                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4496                                         'bottom', 'text-bottom' ),
4497                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4498                                         'upright', 'border' ),
4499                         );
4500                         static $internalParamMap;
4501                         if ( !$internalParamMap ) {
4502                                 $internalParamMap = array();
4503                                 foreach ( $internalParamNames as $type => $names ) {
4504                                         foreach ( $names as $name ) {
4505                                                 $magicName = str_replace( '-', '_', "img_$name" );
4506                                                 $internalParamMap[$magicName] = array( $type, $name );
4507                                         }
4508                                 }
4509                         }
4510
4511                         // Add handler params
4512                         $paramMap = $internalParamMap;
4513                         if ( $handler ) {
4514                                 $handlerParamMap = $handler->getParamMap();
4515                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4516                                         $paramMap[$magic] = array( 'handler', $paramName );
4517                                 }
4518                         }
4519                         $this->mImageParams[$handlerClass] = $paramMap;
4520                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4521                 }
4522                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4523         }
4524
4525         /**
4526          * Parse image options text and use it to make an image
4527          */
4528         function makeImage( $title, $options ) {
4529                 # @TODO: let the MediaHandler specify its transform parameters
4530                 #
4531                 # Check if the options text is of the form "options|alt text"
4532                 # Options are:
4533                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4534                 #  * left               no resizing, just left align. label is used for alt= only
4535                 #  * right              same, but right aligned
4536                 #  * none               same, but not aligned
4537                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4538                 #  * center             center the image
4539                 #  * framed             Keep original image size, no magnify-button.
4540                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4541                 #  * upright            reduce width for upright images, rounded to full __0 px
4542                 #  * border             draw a 1px border around the image
4543                 # vertical-align values (no % or length right now):
4544                 #  * baseline
4545                 #  * sub
4546                 #  * super
4547                 #  * top
4548                 #  * text-top
4549                 #  * middle
4550                 #  * bottom
4551                 #  * text-bottom
4552
4553                 $parts = array_map( 'trim', explode( '|', $options) );
4554                 $sk = $this->mOptions->getSkin();
4555
4556                 # Give extensions a chance to select the file revision for us
4557                 $skip = $time = false;
4558                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time ) );
4559
4560                 if ( $skip ) {
4561                         return $sk->makeLinkObj( $title );
4562                 }
4563
4564                 # Get parameter map
4565                 $file = wfFindFile( $title, $time );
4566                 $handler = $file ? $file->getHandler() : false;
4567
4568                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4569
4570                 # Process the input parameters
4571                 $caption = '';
4572                 $params = array( 'frame' => array(), 'handler' => array(),
4573                         'horizAlign' => array(), 'vertAlign' => array() );
4574                 foreach( $parts as $part ) {
4575                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4576                         if ( isset( $paramMap[$magicName] ) ) {
4577                                 list( $type, $paramName ) = $paramMap[$magicName];
4578                                 $params[$type][$paramName] = $value;
4579
4580                                 // Special case; width and height come in one variable together
4581                                 if( $type == 'handler' && $paramName == 'width' ) {
4582                                         $m = array();
4583                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $value, $m ) ) {
4584                                                 $params[$type]['width'] = intval( $m[1] );
4585                                                 $params[$type]['height'] = intval( $m[2] );
4586                                         } else {
4587                                                 $params[$type]['width'] = intval( $value );
4588                                         }
4589                                 }
4590                         } else {
4591                                 $caption = $part;
4592                         }
4593                 }
4594
4595                 # Process alignment parameters
4596                 if ( $params['horizAlign'] ) {
4597                         $params['frame']['align'] = key( $params['horizAlign'] );
4598                 }
4599                 if ( $params['vertAlign'] ) {
4600                         $params['frame']['valign'] = key( $params['vertAlign'] );
4601                 }
4602
4603                 # Validate the handler parameters
4604                 if ( $handler ) {
4605                         foreach ( $params['handler'] as $name => $value ) {
4606                                 if ( !$handler->validateParam( $name, $value ) ) {
4607                                         unset( $params['handler'][$name] );
4608                                 }
4609                         }
4610                 }
4611
4612                 # Strip bad stuff out of the alt text
4613                 $alt = $this->replaceLinkHoldersText( $caption );
4614
4615                 # make sure there are no placeholders in thumbnail attributes
4616                 # that are later expanded to html- so expand them now and
4617                 # remove the tags
4618                 $alt = $this->mStripState->unstripBoth( $alt );
4619                 $alt = Sanitizer::stripAllTags( $alt );
4620
4621                 $params['frame']['alt'] = $alt;
4622                 $params['frame']['caption'] = $caption;
4623
4624                 # Linker does the rest
4625                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'] );
4626
4627                 # Give the handler a chance to modify the parser object
4628                 if ( $handler ) {
4629                         $handler->parserTransformHook( $this, $file );
4630                 }
4631
4632                 return $ret;
4633         }
4634
4635         /**
4636          * Set a flag in the output object indicating that the content is dynamic and
4637          * shouldn't be cached.
4638          */
4639         function disableCache() {
4640                 wfDebug( "Parser output marked as uncacheable.\n" );
4641                 $this->mOutput->mCacheTime = -1;
4642         }
4643
4644         /**#@+
4645          * Callback from the Sanitizer for expanding items found in HTML attribute
4646          * values, so they can be safely tested and escaped.
4647          * @param string $text
4648          * @param array $args
4649          * @return string
4650          * @private
4651          */
4652         function attributeStripCallback( &$text, $args ) {
4653                 $text = $this->replaceVariables( $text, $args );
4654                 $text = $this->mStripState->unstripBoth( $text );
4655                 return $text;
4656         }
4657
4658         /**#@-*/
4659
4660         /**#@+
4661          * Accessor/mutator
4662          */
4663         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4664         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4665         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4666         /**#@-*/
4667
4668         /**#@+
4669          * Accessor
4670          */
4671         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4672         /**#@-*/
4673
4674
4675         /**
4676          * Break wikitext input into sections, and either pull or replace
4677          * some particular section's text.
4678          *
4679          * External callers should use the getSection and replaceSection methods.
4680          *
4681          * @param $text Page wikitext
4682          * @param $section Numbered section. 0 pulls the text before the first
4683          *                 heading; other numbers will pull the given section
4684          *                 along with its lower-level subsections.
4685          * @param $mode One of "get" or "replace"
4686          * @param $newtext Replacement text for section data.
4687          * @return string for "get", the extracted section text.
4688          *                for "replace", the whole page with the section replaced.
4689          */
4690         private function extractSections( $text, $section, $mode, $newtext='' ) {
4691                 # I.... _hope_ this is right.
4692                 # Otherwise, sometimes we don't have things initialized properly.
4693                 $this->clearState();
4694
4695                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4696                 # comments to be stripped as well)
4697                 $stripState = new StripState;
4698
4699                 $oldOutputType = $this->mOutputType;
4700                 $oldOptions = $this->mOptions;
4701                 $this->mOptions = new ParserOptions();
4702                 $this->setOutputType( self::OT_WIKI );
4703
4704                 $striptext = $this->strip( $text, $stripState, true );
4705
4706                 $this->setOutputType( $oldOutputType );
4707                 $this->mOptions = $oldOptions;
4708
4709                 # now that we can be sure that no pseudo-sections are in the source,
4710                 # split it up by section
4711                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4712                 $comment = "(?:$uniq-!--.*?QINU\x07)";
4713                 $secs = preg_split(
4714                         "/
4715                         (
4716                                 ^
4717                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4718                                 (=+) # Should this be limited to 6?
4719                                 .+?  # Section title...
4720                                 \\2  # Ending = count must match start
4721                                 (?:$comment|<\/?noinclude>|[ \\t]+)* # Trailing whitespace ok
4722                                 $
4723                         |
4724                                 <h([1-6])\b.*?>
4725                                 .*?
4726                                 <\/h\\3\s*>
4727                         )
4728                         /mix",
4729                         $striptext, -1,
4730                         PREG_SPLIT_DELIM_CAPTURE);
4731
4732                 if( $mode == "get" ) {
4733                         if( $section == 0 ) {
4734                                 // "Section 0" returns the content before any other section.
4735                                 $rv = $secs[0];
4736                         } else {
4737                                 //track missing section, will replace if found.
4738                                 $rv = $newtext;
4739                         }
4740                 } elseif( $mode == "replace" ) {
4741                         if( $section == 0 ) {
4742                                 $rv = $newtext . "\n\n";
4743                                 $remainder = true;
4744                         } else {
4745                                 $rv = $secs[0];
4746                                 $remainder = false;
4747                         }
4748                 }
4749                 $count = 0;
4750                 $sectionLevel = 0;
4751                 for( $index = 1; $index < count( $secs ); ) {
4752                         $headerLine = $secs[$index++];
4753                         if( $secs[$index] ) {
4754                                 // A wiki header
4755                                 $headerLevel = strlen( $secs[$index++] );
4756                         } else {
4757                                 // An HTML header
4758                                 $index++;
4759                                 $headerLevel = intval( $secs[$index++] );
4760                         }
4761                         $content = $secs[$index++];
4762
4763                         $count++;
4764                         if( $mode == "get" ) {
4765                                 if( $count == $section ) {
4766                                         $rv = $headerLine . $content;
4767                                         $sectionLevel = $headerLevel;
4768                                 } elseif( $count > $section ) {
4769                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4770                                                 $rv .= $headerLine . $content;
4771                                         } else {
4772                                                 // Broke out to a higher-level section
4773                                                 break;
4774                                         }
4775                                 }
4776                         } elseif( $mode == "replace" ) {
4777                                 if( $count < $section ) {
4778                                         $rv .= $headerLine . $content;
4779                                 } elseif( $count == $section ) {
4780                                         $rv .= $newtext . "\n\n";
4781                                         $sectionLevel = $headerLevel;
4782                                 } elseif( $count > $section ) {
4783                                         if( $headerLevel <= $sectionLevel ) {
4784                                                 // Passed the section's sub-parts.
4785                                                 $remainder = true;
4786                                         }
4787                                         if( $remainder ) {
4788                                                 $rv .= $headerLine . $content;
4789                                         }
4790                                 }
4791                         }
4792                 }
4793                 if (is_string($rv))
4794                         # reinsert stripped tags
4795                         $rv = trim( $stripState->unstripBoth( $rv ) );
4796
4797                 return $rv;
4798         }
4799
4800         /**
4801          * This function returns the text of a section, specified by a number ($section).
4802          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4803          * the first section before any such heading (section 0).
4804          *
4805          * If a section contains subsections, these are also returned.
4806          *
4807          * @param $text String: text to look in
4808          * @param $section Integer: section number
4809          * @param $deftext: default to return if section is not found
4810          * @return string text of the requested section
4811          */
4812         public function getSection( $text, $section, $deftext='' ) {
4813                 return $this->extractSections( $text, $section, "get", $deftext );
4814         }
4815
4816         public function replaceSection( $oldtext, $section, $text ) {
4817                 return $this->extractSections( $oldtext, $section, "replace", $text );
4818         }
4819
4820         /**
4821          * Get the timestamp associated with the current revision, adjusted for
4822          * the default server-local timestamp
4823          */
4824         function getRevisionTimestamp() {
4825                 if ( is_null( $this->mRevisionTimestamp ) ) {
4826                         wfProfileIn( __METHOD__ );
4827                         global $wgContLang;
4828                         $dbr = wfGetDB( DB_SLAVE );
4829                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4830                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4831
4832                         // Normalize timestamp to internal MW format for timezone processing.
4833                         // This has the added side-effect of replacing a null value with
4834                         // the current time, which gives us more sensible behavior for
4835                         // previews.
4836                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4837
4838                         // The cryptic '' timezone parameter tells to use the site-default
4839                         // timezone offset instead of the user settings.
4840                         //
4841                         // Since this value will be saved into the parser cache, served
4842                         // to other users, and potentially even used inside links and such,
4843                         // it needs to be consistent for all visitors.
4844                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4845
4846                         wfProfileOut( __METHOD__ );
4847                 }
4848                 return $this->mRevisionTimestamp;
4849         }
4850
4851         /**
4852          * Mutator for $mDefaultSort
4853          *
4854          * @param $sort New value
4855          */
4856         public function setDefaultSort( $sort ) {
4857                 $this->mDefaultSort = $sort;
4858         }
4859
4860         /**
4861          * Accessor for $mDefaultSort
4862          * Will use the title/prefixed title if none is set
4863          *
4864          * @return string
4865          */
4866         public function getDefaultSort() {
4867                 if( $this->mDefaultSort !== false ) {
4868                         return $this->mDefaultSort;
4869                 } else {
4870                         return $this->mTitle->getNamespace() == NS_CATEGORY
4871                                         ? $this->mTitle->getText()
4872                                         : $this->mTitle->getPrefixedText();
4873                 }
4874         }
4875
4876         /**
4877          * Try to guess the section anchor name based on a wikitext fragment
4878          * presumably extracted from a heading, for example "Header" from
4879          * "== Header ==".
4880          */
4881         public function guessSectionNameFromWikiText( $text ) {
4882                 # Strip out wikitext links(they break the anchor)
4883                 $text = $this->stripSectionName( $text );
4884                 $headline = Sanitizer::decodeCharReferences( $text );
4885                 # strip out HTML
4886                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4887                 $headline = trim( $headline );
4888                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4889                 $replacearray = array(
4890                         '%3A' => ':',
4891                         '%' => '.'
4892                 );
4893                 return str_replace(
4894                         array_keys( $replacearray ),
4895                         array_values( $replacearray ),
4896                         $sectionanchor );
4897         }
4898
4899         /**
4900          * Strips a text string of wikitext for use in a section anchor
4901          *
4902          * Accepts a text string and then removes all wikitext from the
4903          * string and leaves only the resultant text (i.e. the result of
4904          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4905          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4906          * to create valid section anchors by mimicing the output of the
4907          * parser when headings are parsed.
4908          *
4909          * @param $text string Text string to be stripped of wikitext
4910          * for use in a Section anchor
4911          * @return Filtered text string
4912          */
4913         public function stripSectionName( $text ) {
4914                 # Strip internal link markup
4915                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4916                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4917
4918                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4919                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4920                 # on how many empty links there are on the page - need to figure that out.
4921                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4922
4923                 # Parse wikitext quotes (italics & bold)
4924                 $text = $this->doQuotes($text);
4925
4926                 # Strip HTML tags
4927                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4928                 return $text;
4929         }
4930
4931         /**
4932          * strip/replaceVariables/unstrip for preprocessor regression testing
4933          */
4934         function srvus( $text ) {
4935                 $text = $this->strip( $text, $this->mStripState );
4936                 $text = Sanitizer::removeHTMLtags( $text );
4937                 $text = $this->replaceVariables( $text );
4938                 $text = preg_replace( '/<!--MWTEMPLATESECTION.*?-->/', '', $text );
4939                 $text = $this->mStripState->unstripBoth( $text );
4940                 return $text;
4941         }
4942 }