includes/parser/CoreParserFunctions.php

   1 <?php
   2 /**
   3  * Parser functions provided by MediaWiki core
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Parser
  22  */
  23
  24 /**
  25  * Various core parser functions, registered in Parser::firstCallInit()
  26  * @ingroup Parser
  27  */
  28 class CoreParserFunctions {
  29         /**
  30          * @param Parser $parser
  31          * @return void
  32          */
  33         public static function register( $parser ) {
  34                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  35
  36                 # Syntax for arguments (see Parser::setFunctionHook):
  37                 #  "name for lookup in localized magic words array",
  38                 #  function callback,
  39                 #  optional Parser::SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}}
  40                 #    instead of {{#int:...}})
  41                 $noHashFunctions = array(
  42                         'ns', 'nse', 'urlencode', 'lcfirst', 'ucfirst', 'lc', 'uc',
  43                         'localurl', 'localurle', 'fullurl', 'fullurle', 'canonicalurl',
  44                         'canonicalurle', 'formatnum', 'grammar', 'gender', 'plural', 'bidi',
  45                         'numberofpages', 'numberofusers', 'numberofactiveusers',
  46                         'numberofarticles', 'numberoffiles', 'numberofadmins',
  47                         'numberingroup', 'numberofedits', 'language',
  48                         'padleft', 'padright', 'anchorencode', 'defaultsort', 'filepath',
  49                         'pagesincategory', 'pagesize', 'protectionlevel',
  50                         'namespacee', 'namespacenumber', 'talkspace', 'talkspacee',
  51                         'subjectspace', 'subjectspacee', 'pagename', 'pagenamee',
  52                         'fullpagename', 'fullpagenamee', 'rootpagename', 'rootpagenamee',
  53                         'basepagename', 'basepagenamee', 'subpagename', 'subpagenamee',
  54                         'talkpagename', 'talkpagenamee', 'subjectpagename',
  55                         'subjectpagenamee', 'pageid', 'revisionid', 'revisionday',
  56                         'revisionday2', 'revisionmonth', 'revisionmonth1', 'revisionyear',
  57                         'revisiontimestamp', 'revisionuser', 'cascadingsources',
  58                 );
  59                 foreach ( $noHashFunctions as $func ) {
  60                         $parser->setFunctionHook( $func, array( __CLASS__, $func ), Parser::SFH_NO_HASH );
  61                 }
  62
  63                 $parser->setFunctionHook( 'namespace', array( __CLASS__, 'mwnamespace' ), Parser::SFH_NO_HASH );
  64                 $parser->setFunctionHook( 'int', array( __CLASS__, 'intFunction' ), Parser::SFH_NO_HASH );
  65                 $parser->setFunctionHook( 'special', array( __CLASS__, 'special' ) );
  66                 $parser->setFunctionHook( 'speciale', array( __CLASS__, 'speciale' ) );
  67                 $parser->setFunctionHook( 'tag', array( __CLASS__, 'tagObj' ), Parser::SFH_OBJECT_ARGS );
  68                 $parser->setFunctionHook( 'formatdate', array( __CLASS__, 'formatDate' ) );
  69
  70                 if ( $wgAllowDisplayTitle ) {
  71                         $parser->setFunctionHook( 'displaytitle', array( __CLASS__, 'displaytitle' ), Parser::SFH_NO_HASH );
  72                 }
  73                 if ( $wgAllowSlowParserFunctions ) {
  74                         $parser->setFunctionHook(
  75                                 'pagesinnamespace',
  76                                 array( __CLASS__, 'pagesinnamespace' ),
  77                                 Parser::SFH_NO_HASH
  78                         );
  79                 }
  80         }
  81
  82         /**
  83          * @param Parser $parser
  84          * @param string $part1
  85          * @return array
  86          */
  87         public static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  88                 if ( strval( $part1 ) !== '' ) {
  89                         $args = array_slice( func_get_args(), 2 );
  90                         $message = wfMessage( $part1, $args )
  91                                 ->inLanguage( $parser->getOptions()->getUserLangObj() );
  92                         if ( !$message->exists() ) {
  93                                 // When message does not exists, the message name is surrounded by angle
  94                                 // and can result in a tag, therefore escape the angles
  95                                 return $message->escaped();
  96                         }
  97                         return array( $message->plain(), 'noparse' => false );
  98                 } else {
  99                         return array( 'found' => false );
 100                 }
 101         }
 102
 103         /**
 104          * @param Parser $parser
 105          * @param string $date
 106          * @param string $defaultPref
 107          *
 108          * @return string
 109          */
 110         public static function formatDate( $parser, $date, $defaultPref = null ) {
 111                 $lang = $parser->getFunctionLang();
 112                 $df = DateFormatter::getInstance( $lang );
 113
 114                 $date = trim( $date );
 115
 116                 $pref = $parser->getOptions()->getDateFormat();
 117
 118                 // Specify a different default date format other than the normal default
 119                 // if the user has 'default' for their setting
 120                 if ( $pref == 'default' && $defaultPref ) {
 121                         $pref = $defaultPref;
 122                 }
 123
 124                 $date = $df->reformat( $pref, $date, array( 'match-whole' ) );
 125                 return $date;
 126         }
 127
 128         public static function ns( $parser, $part1 = '' ) {
 129                 global $wgContLang;
 130                 if ( intval( $part1 ) || $part1 == "0" ) {
 131                         $index = intval( $part1 );
 132                 } else {
 133                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 134                 }
 135                 if ( $index !== false ) {
 136                         return $wgContLang->getFormattedNsText( $index );
 137                 } else {
 138                         return array( 'found' => false );
 139                 }
 140         }
 141
 142         public static function nse( $parser, $part1 = '' ) {
 143                 $ret = self::ns( $parser, $part1 );
 144                 if ( is_string( $ret ) ) {
 145                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 146                 }
 147                 return $ret;
 148         }
 149
 150         /**
 151          * urlencodes a string according to one of three patterns: (bug 22474)
 152          *
 153          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 154          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 155          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 156          *
 157          * @param Parser $parser
 158          * @param string $s The text to encode.
 159          * @param string $arg (optional): The type of encoding.
 160          * @return string
 161          */
 162         public static function urlencode( $parser, $s = '', $arg = null ) {
 163                 static $magicWords = null;
 164                 if ( is_null( $magicWords ) ) {
 165                         $magicWords = new MagicWordArray( array( 'url_path', 'url_query', 'url_wiki' ) );
 166                 }
 167                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 168
 169                         // Encode as though it's a wiki page, '_' for ' '.
 170                         case 'url_wiki':
 171                                 $func = 'wfUrlencode';
 172                                 $s = str_replace( ' ', '_', $s );
 173                                 break;
 174
 175                         // Encode for an HTTP Path, '%20' for ' '.
 176                         case 'url_path':
 177                                 $func = 'rawurlencode';
 178                                 break;
 179
 180                         // Encode for HTTP query, '+' for ' '.
 181                         case 'url_query':
 182                         default:
 183                                 $func = 'urlencode';
 184                 }
 185                 // See T105242, where the choice to kill markers and various
 186                 // other options were discussed.
 187                 return $func( $parser->killMarkers( $s ) );
 188         }
 189
 190         public static function lcfirst( $parser, $s = '' ) {
 191                 global $wgContLang;
 192                 return $wgContLang->lcfirst( $s );
 193         }
 194
 195         public static function ucfirst( $parser, $s = '' ) {
 196                 global $wgContLang;
 197                 return $wgContLang->ucfirst( $s );
 198         }
 199
 200         /**
 201          * @param Parser $parser
 202          * @param string $s
 203          * @return string
 204          */
 205         public static function lc( $parser, $s = '' ) {
 206                 global $wgContLang;
 207                 return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
 208         }
 209
 210         /**
 211          * @param Parser $parser
 212          * @param string $s
 213          * @return string
 214          */
 215         public static function uc( $parser, $s = '' ) {
 216                 global $wgContLang;
 217                 return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
 218         }
 219
 220         public static function localurl( $parser, $s = '', $arg = null ) {
 221                 return self::urlFunction( 'getLocalURL', $s, $arg );
 222         }
 223
 224         public static function localurle( $parser, $s = '', $arg = null ) {
 225                 $temp = self::urlFunction( 'getLocalURL', $s, $arg );
 226                 if ( !is_string( $temp ) ) {
 227                         return $temp;
 228                 } else {
 229                         return htmlspecialchars( $temp );
 230                 }
 231         }
 232
 233         public static function fullurl( $parser, $s = '', $arg = null ) {
 234                 return self::urlFunction( 'getFullURL', $s, $arg );
 235         }
 236
 237         public static function fullurle( $parser, $s = '', $arg = null ) {
 238                 $temp = self::urlFunction( 'getFullURL', $s, $arg );
 239                 if ( !is_string( $temp ) ) {
 240                         return $temp;
 241                 } else {
 242                         return htmlspecialchars( $temp );
 243                 }
 244         }
 245
 246         public static function canonicalurl( $parser, $s = '', $arg = null ) {
 247                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 248         }
 249
 250         public static function canonicalurle( $parser, $s = '', $arg = null ) {
 251                 $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
 252                 if ( !is_string( $temp ) ) {
 253                         return $temp;
 254                 } else {
 255                         return htmlspecialchars( $temp );
 256                 }
 257         }
 258
 259         public static function urlFunction( $func, $s = '', $arg = null ) {
 260                 $title = Title::newFromText( $s );
 261                 # Due to order of execution of a lot of bits, the values might be encoded
 262                 # before arriving here; if that's true, then the title can't be created
 263                 # and the variable will fail. If we can't get a decent title from the first
 264                 # attempt, url-decode and try for a second.
 265                 if ( is_null( $title ) ) {
 266                         $title = Title::newFromURL( urldecode( $s ) );
 267                 }
 268                 if ( !is_null( $title ) ) {
 269                         # Convert NS_MEDIA -> NS_FILE
 270                         if ( $title->getNamespace() == NS_MEDIA ) {
 271                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 272                         }
 273                         if ( !is_null( $arg ) ) {
 274                                 $text = $title->$func( $arg );
 275                         } else {
 276                                 $text = $title->$func();
 277                         }
 278                         return $text;
 279                 } else {
 280                         return array( 'found' => false );
 281                 }
 282         }
 283
 284         /**
 285          * @param Parser $parser
 286          * @param string $num
 287          * @param string $arg
 288          * @return string
 289          */
 290         public static function formatnum( $parser, $num = '', $arg = null ) {
 291                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg ) ) {
 292                         $func = array( $parser->getFunctionLang(), 'parseFormattedNumber' );
 293                 } elseif ( self::matchAgainstMagicword( 'nocommafysuffix', $arg ) ) {
 294                         $func = array( $parser->getFunctionLang(), 'formatNumNoSeparators' );
 295                 } else {
 296                         $func = array( $parser->getFunctionLang(), 'formatNum' );
 297                 }
 298                 return $parser->markerSkipCallback( $num, $func );
 299         }
 300
 301         /**
 302          * @param Parser $parser
 303          * @param string $case
 304          * @param string $word
 305          * @return string
 306          */
 307         public static function grammar( $parser, $case = '', $word = '' ) {
 308                 $word = $parser->killMarkers( $word );
 309                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 310         }
 311
 312         /**
 313          * @param Parser $parser
 314          * @param string $username
 315          * @return string
 316          */
 317         public static function gender( $parser, $username ) {
 318                 $forms = array_slice( func_get_args(), 2 );
 319
 320                 // Some shortcuts to avoid loading user data unnecessarily
 321                 if ( count( $forms ) === 0 ) {
 322                         return '';
 323                 } elseif ( count( $forms ) === 1 ) {
 324                         return $forms[0];
 325                 }
 326
 327                 $username = trim( $username );
 328
 329                 // default
 330                 $gender = User::getDefaultOption( 'gender' );
 331
 332                 // allow prefix.
 333                 $title = Title::newFromText( $username );
 334
 335                 if ( $title && $title->getNamespace() == NS_USER ) {
 336                         $username = $title->getText();
 337                 }
 338
 339                 // check parameter, or use the ParserOptions if in interface message
 340                 $user = User::newFromName( $username );
 341                 if ( $user ) {
 342                         $gender = GenderCache::singleton()->getGenderOf( $user, __METHOD__ );
 343                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 344                         $gender = GenderCache::singleton()->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 345                 }
 346                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 347                 return $ret;
 348         }
 349
 350         /**
 351          * @param Parser $parser
 352          * @param string $text
 353          * @return string
 354          */
 355         public static function plural( $parser, $text = '' ) {
 356                 $forms = array_slice( func_get_args(), 2 );
 357                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 358                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 359                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 360         }
 361
 362         /**
 363          * @param Parser $parser
 364          * @param string $text
 365          * @return string
 366          */
 367         public static function bidi( $parser, $text = '' ) {
 368                 return $parser->getFunctionLang()->embedBidi( $text );
 369         }
 370
 371         /**
 372          * Override the title of the page when viewed, provided we've been given a
 373          * title which will normalise to the canonical title
 374          *
 375          * @param Parser $parser Parent parser
 376          * @param string $text Desired title text
 377          * @param string $uarg
 378          * @return string
 379          */
 380         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 381                 global $wgRestrictDisplayTitle;
 382
 383                 static $magicWords = null;
 384                 if ( is_null( $magicWords ) ) {
 385                         $magicWords = new MagicWordArray( array( 'displaytitle_noerror', 'displaytitle_noreplace' ) );
 386                 }
 387                 $arg = $magicWords->matchStartToEnd( $uarg );
 388
 389                 // parse a limited subset of wiki markup (just the single quote items)
 390                 $text = $parser->doQuotes( $text );
 391
 392                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 393                 $text = $parser->killMarkers( $text );
 394
 395                 // list of disallowed tags for DISPLAYTITLE
 396                 // these will be escaped even though they are allowed in normal wiki text
 397                 $bad = array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 398                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' );
 399
 400                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 401                 if ( $wgRestrictDisplayTitle ) {
 402                         $htmlTagsCallback = function ( &$params ) {
 403                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 404
 405                                 if ( isset( $decoded['style'] ) ) {
 406                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 407                                         // calling it twice doesn't hurt
 408                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 409
 410                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 411                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 412                                         }
 413                                 }
 414
 415                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 416                         };
 417                 } else {
 418                         $htmlTagsCallback = null;
 419                 }
 420
 421                 // only requested titles that normalize to the actual title are allowed through
 422                 // if $wgRestrictDisplayTitle is true (it is by default)
 423                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 424                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 425                         $text,
 426                         $htmlTagsCallback,
 427                         array(),
 428                         array(),
 429                         $bad
 430                 ) );
 431                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 432
 433                 if ( !$wgRestrictDisplayTitle ||
 434                         ( $title instanceof Title
 435                         && !$title->hasFragment()
 436                         && $title->equals( $parser->mTitle ) )
 437                 ) {
 438                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 439                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 440                                 $parser->mOutput->setDisplayTitle( $text );
 441                         }
 442                         if ( $old !== false && $old !== $text && !$arg ) {
 443                                 $converter = $parser->getConverterLanguage()->getConverter();
 444                                 return '<span class="error">' .
 445                                         wfMessage( 'duplicate-displaytitle',
 446                                                 // Message should be parsed, but these params should only be escaped.
 447                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 448                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 449                                         )->inContentLanguage()->text() .
 450                                         '</span>';
 451                         }
 452                 }
 453
 454                 return '';
 455         }
 456
 457         /**
 458          * Matches the given value against the value of given magic word
 459          *
 460          * @param string $magicword Magic word key
 461          * @param string $value Value to match
 462          * @return bool True on successful match
 463          */
 464         private static function matchAgainstMagicword( $magicword, $value ) {
 465                 $value = trim( strval( $value ) );
 466                 if ( $value === '' ) {
 467                         return false;
 468                 }
 469                 $mwObject = MagicWord::get( $magicword );
 470                 return $mwObject->matchStartToEnd( $value );
 471         }
 472
 473         public static function formatRaw( $num, $raw ) {
 474                 if ( self::matchAgainstMagicword( 'rawsuffix', $raw ) ) {
 475                         return $num;
 476                 } else {
 477                         global $wgContLang;
 478                         return $wgContLang->formatNum( $num );
 479                 }
 480         }
 481         public static function numberofpages( $parser, $raw = null ) {
 482                 return self::formatRaw( SiteStats::pages(), $raw );
 483         }
 484         public static function numberofusers( $parser, $raw = null ) {
 485                 return self::formatRaw( SiteStats::users(), $raw );
 486         }
 487         public static function numberofactiveusers( $parser, $raw = null ) {
 488                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 489         }
 490         public static function numberofarticles( $parser, $raw = null ) {
 491                 return self::formatRaw( SiteStats::articles(), $raw );
 492         }
 493         public static function numberoffiles( $parser, $raw = null ) {
 494                 return self::formatRaw( SiteStats::images(), $raw );
 495         }
 496         public static function numberofadmins( $parser, $raw = null ) {
 497                 return self::formatRaw( SiteStats::numberingroup( 'sysop' ), $raw );
 498         }
 499         public static function numberofedits( $parser, $raw = null ) {
 500                 return self::formatRaw( SiteStats::edits(), $raw );
 501         }
 502         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 503                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 504         }
 505         public static function numberingroup( $parser, $name = '', $raw = null ) {
 506                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 507         }
 508
 509         /**
 510          * Given a title, return the namespace name that would be given by the
 511          * corresponding magic word
 512          * Note: function name changed to "mwnamespace" rather than "namespace"
 513          * to not break PHP 5.3
 514          * @param Parser $parser
 515          * @param string $title
 516          * @return mixed|string
 517          */
 518         public static function mwnamespace( $parser, $title = null ) {
 519                 $t = Title::newFromText( $title );
 520                 if ( is_null( $t ) ) {
 521                         return '';
 522                 }
 523                 return str_replace( '_', ' ', $t->getNsText() );
 524         }
 525         public static function namespacee( $parser, $title = null ) {
 526                 $t = Title::newFromText( $title );
 527                 if ( is_null( $t ) ) {
 528                         return '';
 529                 }
 530                 return wfUrlencode( $t->getNsText() );
 531         }
 532         public static function namespacenumber( $parser, $title = null ) {
 533                 $t = Title::newFromText( $title );
 534                 if ( is_null( $t ) ) {
 535                         return '';
 536                 }
 537                 return $t->getNamespace();
 538         }
 539         public static function talkspace( $parser, $title = null ) {
 540                 $t = Title::newFromText( $title );
 541                 if ( is_null( $t ) || !$t->canTalk() ) {
 542                         return '';
 543                 }
 544                 return str_replace( '_', ' ', $t->getTalkNsText() );
 545         }
 546         public static function talkspacee( $parser, $title = null ) {
 547                 $t = Title::newFromText( $title );
 548                 if ( is_null( $t ) || !$t->canTalk() ) {
 549                         return '';
 550                 }
 551                 return wfUrlencode( $t->getTalkNsText() );
 552         }
 553         public static function subjectspace( $parser, $title = null ) {
 554                 $t = Title::newFromText( $title );
 555                 if ( is_null( $t ) ) {
 556                         return '';
 557                 }
 558                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 559         }
 560         public static function subjectspacee( $parser, $title = null ) {
 561                 $t = Title::newFromText( $title );
 562                 if ( is_null( $t ) ) {
 563                         return '';
 564                 }
 565                 return wfUrlencode( $t->getSubjectNsText() );
 566         }
 567
 568         /**
 569          * Functions to get and normalize pagenames, corresponding to the magic words
 570          * of the same names
 571          * @param Parser $parser
 572          * @param string $title
 573          * @return string
 574          */
 575         public static function pagename( $parser, $title = null ) {
 576                 $t = Title::newFromText( $title );
 577                 if ( is_null( $t ) ) {
 578                         return '';
 579                 }
 580                 return wfEscapeWikiText( $t->getText() );
 581         }
 582         public static function pagenamee( $parser, $title = null ) {
 583                 $t = Title::newFromText( $title );
 584                 if ( is_null( $t ) ) {
 585                         return '';
 586                 }
 587                 return wfEscapeWikiText( $t->getPartialURL() );
 588         }
 589         public static function fullpagename( $parser, $title = null ) {
 590                 $t = Title::newFromText( $title );
 591                 if ( is_null( $t ) || !$t->canTalk() ) {
 592                         return '';
 593                 }
 594                 return wfEscapeWikiText( $t->getPrefixedText() );
 595         }
 596         public static function fullpagenamee( $parser, $title = null ) {
 597                 $t = Title::newFromText( $title );
 598                 if ( is_null( $t ) || !$t->canTalk() ) {
 599                         return '';
 600                 }
 601                 return wfEscapeWikiText( $t->getPrefixedURL() );
 602         }
 603         public static function subpagename( $parser, $title = null ) {
 604                 $t = Title::newFromText( $title );
 605                 if ( is_null( $t ) ) {
 606                         return '';
 607                 }
 608                 return wfEscapeWikiText( $t->getSubpageText() );
 609         }
 610         public static function subpagenamee( $parser, $title = null ) {
 611                 $t = Title::newFromText( $title );
 612                 if ( is_null( $t ) ) {
 613                         return '';
 614                 }
 615                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 616         }
 617         public static function rootpagename( $parser, $title = null ) {
 618                 $t = Title::newFromText( $title );
 619                 if ( is_null( $t ) ) {
 620                         return '';
 621                 }
 622                 return wfEscapeWikiText( $t->getRootText() );
 623         }
 624         public static function rootpagenamee( $parser, $title = null ) {
 625                 $t = Title::newFromText( $title );
 626                 if ( is_null( $t ) ) {
 627                         return '';
 628                 }
 629                 return wfEscapeWikiText( wfUrlEncode( str_replace( ' ', '_', $t->getRootText() ) ) );
 630         }
 631         public static function basepagename( $parser, $title = null ) {
 632                 $t = Title::newFromText( $title );
 633                 if ( is_null( $t ) ) {
 634                         return '';
 635                 }
 636                 return wfEscapeWikiText( $t->getBaseText() );
 637         }
 638         public static function basepagenamee( $parser, $title = null ) {
 639                 $t = Title::newFromText( $title );
 640                 if ( is_null( $t ) ) {
 641                         return '';
 642                 }
 643                 return wfEscapeWikiText( wfUrlEncode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 644         }
 645         public static function talkpagename( $parser, $title = null ) {
 646                 $t = Title::newFromText( $title );
 647                 if ( is_null( $t ) || !$t->canTalk() ) {
 648                         return '';
 649                 }
 650                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 651         }
 652         public static function talkpagenamee( $parser, $title = null ) {
 653                 $t = Title::newFromText( $title );
 654                 if ( is_null( $t ) || !$t->canTalk() ) {
 655                         return '';
 656                 }
 657                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 658         }
 659         public static function subjectpagename( $parser, $title = null ) {
 660                 $t = Title::newFromText( $title );
 661                 if ( is_null( $t ) ) {
 662                         return '';
 663                 }
 664                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 665         }
 666         public static function subjectpagenamee( $parser, $title = null ) {
 667                 $t = Title::newFromText( $title );
 668                 if ( is_null( $t ) ) {
 669                         return '';
 670                 }
 671                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 672         }
 673
 674         /**
 675          * Return the number of pages, files or subcats in the given category,
 676          * or 0 if it's nonexistent. This is an expensive parser function and
 677          * can't be called too many times per page.
 678          * @param Parser $parser
 679          * @param string $name
 680          * @param string $arg1
 681          * @param string $arg2
 682          * @return string
 683          */
 684         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 685                 global $wgContLang;
 686                 static $magicWords = null;
 687                 if ( is_null( $magicWords ) ) {
 688                         $magicWords = new MagicWordArray( array(
 689                                 'pagesincategory_all',
 690                                 'pagesincategory_pages',
 691                                 'pagesincategory_subcats',
 692                                 'pagesincategory_files'
 693                         ) );
 694                 }
 695                 static $cache = array();
 696
 697                 // split the given option to its variable
 698                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg1 ) ) {
 699                         //{{pagesincategory:|raw[|type]}}
 700                         $raw = $arg1;
 701                         $type = $magicWords->matchStartToEnd( $arg2 );
 702                 } else {
 703                         //{{pagesincategory:[|type[|raw]]}}
 704                         $type = $magicWords->matchStartToEnd( $arg1 );
 705                         $raw = $arg2;
 706                 }
 707                 if ( !$type ) { //backward compatibility
 708                         $type = 'pagesincategory_all';
 709                 }
 710
 711                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 712                 if ( !$title ) { # invalid title
 713                         return self::formatRaw( 0, $raw );
 714                 }
 715                 $wgContLang->findVariantLink( $name, $title, true );
 716
 717                 // Normalize name for cache
 718                 $name = $title->getDBkey();
 719
 720                 if ( !isset( $cache[$name] ) ) {
 721                         $category = Category::newFromTitle( $title );
 722
 723                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 724                         if ( $parser->incrementExpensiveFunctionCount() ) {
 725                                 // $allCount is the total number of cat members,
 726                                 // not the count of how many members are normal pages.
 727                                 $allCount = (int)$category->getPageCount();
 728                                 $subcatCount = (int)$category->getSubcatCount();
 729                                 $fileCount = (int)$category->getFileCount();
 730                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 731                         }
 732                         $cache[$name]['pagesincategory_all'] = $allCount;
 733                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 734                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 735                         $cache[$name]['pagesincategory_files'] = $fileCount;
 736                 }
 737
 738                 $count = $cache[$name][$type];
 739                 return self::formatRaw( $count, $raw );
 740         }
 741
 742         /**
 743          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 744          * expensive parser function and can't be called too many times per page.
 745          *
 746          * @param Parser $parser
 747          * @param string $page Name of page to check (Default: empty string)
 748          * @param string $raw Should number be human readable with commas or just number
 749          * @return string
 750          */
 751         public static function pagesize( $parser, $page = '', $raw = null ) {
 752                 $title = Title::newFromText( $page );
 753
 754                 if ( !is_object( $title ) ) {
 755                         return self::formatRaw( 0, $raw );
 756                 }
 757
 758                 // fetch revision from cache/database and return the value
 759                 $rev = self::getCachedRevisionObject( $parser, $title );
 760                 $length = $rev ? $rev->getSize() : 0;
 761                 return self::formatRaw( $length, $raw );
 762         }
 763
 764         /**
 765          * Returns the requested protection level for the current page. This
 766          * is an expensive parser function and can't be called too many times
 767          * per page, unless the protection levels for the given title have
 768          * already been retrieved
 769          *
 770          * @param Parser $parser
 771          * @param string $type
 772          * @param string $title
 773          *
 774          * @return string
 775          */
 776         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 777                 $titleObject = Title::newFromText( $title );
 778                 if ( !( $titleObject instanceof Title ) ) {
 779                         $titleObject = $parser->mTitle;
 780                 }
 781                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 782                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 783                         # Title::getRestrictions returns an array, its possible it may have
 784                         # multiple values in the future
 785                         return implode( $restrictions, ',' );
 786                 }
 787                 return '';
 788         }
 789
 790         /**
 791          * Gives language names.
 792          * @param Parser $parser
 793          * @param string $code Language code (of which to get name)
 794          * @param string $inLanguage Language code (in which to get name)
 795          * @return string
 796          */
 797         public static function language( $parser, $code = '', $inLanguage = '' ) {
 798                 $code = strtolower( $code );
 799                 $inLanguage = strtolower( $inLanguage );
 800                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 801                 return $lang !== '' ? $lang : wfBCP47( $code );
 802         }
 803
 804         /**
 805          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 806          * @param Parser $parser
 807          * @param string $string
 808          * @param int $length
 809          * @param string $padding
 810          * @param int $direction
 811          * @return string
 812          */
 813         public static function pad( $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT ) {
 814                 $padding = $parser->killMarkers( $padding );
 815                 $lengthOfPadding = mb_strlen( $padding );
 816                 if ( $lengthOfPadding == 0 ) {
 817                         return $string;
 818                 }
 819
 820                 # The remaining length to add counts down to 0 as padding is added
 821                 $length = min( $length, 500 ) - mb_strlen( $string );
 822                 # $finalPadding is just $padding repeated enough times so that
 823                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 824                 $finalPadding = '';
 825                 while ( $length > 0 ) {
 826                         # If $length < $lengthofPadding, truncate $padding so we get the
 827                         # exact length desired.
 828                         $finalPadding .= mb_substr( $padding, 0, $length );
 829                         $length -= $lengthOfPadding;
 830                 }
 831
 832                 if ( $direction == STR_PAD_LEFT ) {
 833                         return $finalPadding . $string;
 834                 } else {
 835                         return $string . $finalPadding;
 836                 }
 837         }
 838
 839         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 840                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 841         }
 842
 843         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 844                 return self::pad( $parser, $string, $length, $padding );
 845         }
 846
 847         /**
 848          * @param Parser $parser
 849          * @param string $text
 850          * @return string
 851          */
 852         public static function anchorencode( $parser, $text ) {
 853                 $text = $parser->killMarkers( $text );
 854                 return (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 855         }
 856
 857         public static function special( $parser, $text ) {
 858                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 859                 if ( $page ) {
 860                         $title = SpecialPage::getTitleFor( $page, $subpage );
 861                         return $title->getPrefixedText();
 862                 } else {
 863                         // unknown special page, just use the given text as its title, if at all possible
 864                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 865                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 866                 }
 867         }
 868
 869         public static function speciale( $parser, $text ) {
 870                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 871         }
 872
 873         /**
 874          * @param Parser $parser
 875          * @param string $text The sortkey to use
 876          * @param string $uarg Either "noreplace" or "noerror" (in en)
 877          *   both suppress errors, and noreplace does nothing if
 878          *   a default sortkey already exists.
 879          * @return string
 880          */
 881         public static function defaultsort( $parser, $text, $uarg = '' ) {
 882                 static $magicWords = null;
 883                 if ( is_null( $magicWords ) ) {
 884                         $magicWords = new MagicWordArray( array( 'defaultsort_noerror', 'defaultsort_noreplace' ) );
 885                 }
 886                 $arg = $magicWords->matchStartToEnd( $uarg );
 887
 888                 $text = trim( $text );
 889                 if ( strlen( $text ) == 0 ) {
 890                         return '';
 891                 }
 892                 $old = $parser->getCustomDefaultSort();
 893                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 894                         $parser->setDefaultSort( $text );
 895                 }
 896
 897                 if ( $old === false || $old == $text || $arg ) {
 898                         return '';
 899                 } else {
 900                         $converter = $parser->getConverterLanguage()->getConverter();
 901                         return '<span class="error">' .
 902                                 wfMessage( 'duplicate-defaultsort',
 903                                         // Message should be parsed, but these params should only be escaped.
 904                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 905                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 906                                 )->inContentLanguage()->text() .
 907                                 '</span>';
 908                 }
 909         }
 910
 911         /**
 912          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
 913          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
 914          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
 915          *
 916          * @param Parser $parser
 917          * @param string $name
 918          * @param string $argA
 919          * @param string $argB
 920          * @return array|string
 921          */
 922         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
 923                 $file = wfFindFile( $name );
 924
 925                 if ( $argA == 'nowiki' ) {
 926                         // {{filepath: | option [| size] }}
 927                         $isNowiki = true;
 928                         $parsedWidthParam = $parser->parseWidthParam( $argB );
 929                 } else {
 930                         // {{filepath: [| size [|option]] }}
 931                         $parsedWidthParam = $parser->parseWidthParam( $argA );
 932                         $isNowiki = ( $argB == 'nowiki' );
 933                 }
 934
 935                 if ( $file ) {
 936                         $url = $file->getFullUrl();
 937
 938                         // If a size is requested...
 939                         if ( count( $parsedWidthParam ) ) {
 940                                 $mto = $file->transform( $parsedWidthParam );
 941                                 // ... and we can
 942                                 if ( $mto && !$mto->isError() ) {
 943                                         // ... change the URL to point to a thumbnail.
 944                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
 945                                 }
 946                         }
 947                         if ( $isNowiki ) {
 948                                 return array( $url, 'nowiki' => true );
 949                         }
 950                         return $url;
 951                 } else {
 952                         return '';
 953                 }
 954         }
 955
 956         /**
 957          * Parser function to extension tag adaptor
 958          * @param Parser $parser
 959          * @param PPFrame $frame
 960          * @param PPNode[] $args
 961          * @return string
 962          */
 963         public static function tagObj( $parser, $frame, $args ) {
 964                 if ( !count( $args ) ) {
 965                         return '';
 966                 }
 967                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 968
 969                 if ( count( $args ) ) {
 970                         $inner = $frame->expand( array_shift( $args ) );
 971                 } else {
 972                         $inner = null;
 973                 }
 974
 975                 $attributes = array();
 976                 foreach ( $args as $arg ) {
 977                         $bits = $arg->splitArg();
 978                         if ( strval( $bits['index'] ) === '' ) {
 979                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 980                                 $value = trim( $frame->expand( $bits['value'] ) );
 981                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 982                                         $value = isset( $m[1] ) ? $m[1] : '';
 983                                 }
 984                                 $attributes[$name] = $value;
 985                         }
 986                 }
 987
 988                 $stripList = $parser->getStripList();
 989                 if ( !in_array( $tagName, $stripList ) ) {
 990                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
 991                         $attrText = '';
 992                         foreach ( $attributes as $name => $value ) {
 993                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
 994                         }
 995                         if ( $inner === null ) {
 996                                 return "<$tagName$attrText/>";
 997                         }
 998                         return "<$tagName$attrText>$inner</$tagName>";
 999                 }
1000
1001                 $params = array(
1002                         'name' => $tagName,
1003                         'inner' => $inner,
1004                         'attributes' => $attributes,
1005                         'close' => "</$tagName>",
1006                 );
1007                 return $parser->extensionSubstitution( $params, $frame );
1008         }
1009
1010         /**
1011          * Fetched the current revision of the given title and return this.
1012          * Will increment the expensive function count and
1013          * add a template link to get the value refreshed on changes.
1014          * For a given title, which is equal to the current parser title,
1015          * the revision object from the parser is used, when that is the current one
1016          *
1017          * @param Parser $parser
1018          * @param Title $title
1019          * @return Revision
1020          * @since 1.23
1021          */
1022         private static function getCachedRevisionObject( $parser, $title = null ) {
1023                 if ( is_null( $title ) ) {
1024                         return null;
1025                 }
1026
1027                 // Use the revision from the parser itself, when param is the current page
1028                 // and the revision is the current one
1029                 if ( $title->equals( $parser->getTitle() ) ) {
1030                         $parserRev = $parser->getRevisionObject();
1031                         if ( $parserRev && $parserRev->isCurrent() ) {
1032                                 // force reparse after edit with vary-revision flag
1033                                 $parser->getOutput()->setFlag( 'vary-revision' );
1034                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1035                                 return $parserRev;
1036                         }
1037                 }
1038
1039                 // Normalize name for cache
1040                 $page = $title->getPrefixedDBkey();
1041
1042                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1043                         && !$parser->incrementExpensiveFunctionCount() ) {
1044                         return null;
1045                 }
1046                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1047                 $pageID = $rev ? $rev->getPage() : 0;
1048                 $revID = $rev ? $rev->getId() : 0;
1049
1050                 // Register dependency in templatelinks
1051                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1052
1053                 return $rev;
1054         }
1055
1056         /**
1057          * Get the pageid of a specified page
1058          * @param Parser $parser
1059          * @param string $title Title to get the pageid from
1060          * @return int|null|string
1061          * @since 1.23
1062          */
1063         public static function pageid( $parser, $title = null ) {
1064                 $t = Title::newFromText( $title );
1065                 if ( is_null( $t ) ) {
1066                         return '';
1067                 }
1068                 // Use title from parser to have correct pageid after edit
1069                 if ( $t->equals( $parser->getTitle() ) ) {
1070                         $t = $parser->getTitle();
1071                         return $t->getArticleID();
1072                 }
1073
1074                 // These can't have ids
1075                 if ( !$t->canExist() || $t->isExternal() ) {
1076                         return 0;
1077                 }
1078
1079                 // Check the link cache, maybe something already looked it up.
1080                 $linkCache = LinkCache::singleton();
1081                 $pdbk = $t->getPrefixedDBkey();
1082                 $id = $linkCache->getGoodLinkID( $pdbk );
1083                 if ( $id != 0 ) {
1084                         $parser->mOutput->addLink( $t, $id );
1085                         return $id;
1086                 }
1087                 if ( $linkCache->isBadLink( $pdbk ) ) {
1088                         $parser->mOutput->addLink( $t, 0 );
1089                         return $id;
1090                 }
1091
1092                 // We need to load it from the DB, so mark expensive
1093                 if ( $parser->incrementExpensiveFunctionCount() ) {
1094                         $id = $t->getArticleID();
1095                         $parser->mOutput->addLink( $t, $id );
1096                         return $id;
1097                 }
1098                 return null;
1099         }
1100
1101         /**
1102          * Get the id from the last revision of a specified page.
1103          * @param Parser $parser
1104          * @param string $title Title to get the id from
1105          * @return int|null|string
1106          * @since 1.23
1107          */
1108         public static function revisionid( $parser, $title = null ) {
1109                 $t = Title::newFromText( $title );
1110                 if ( is_null( $t ) ) {
1111                         return '';
1112                 }
1113                 // fetch revision from cache/database and return the value
1114                 $rev = self::getCachedRevisionObject( $parser, $t );
1115                 return $rev ? $rev->getId() : '';
1116         }
1117
1118         /**
1119          * Get the day from the last revision of a specified page.
1120          * @param Parser $parser
1121          * @param string $title Title to get the day from
1122          * @return string
1123          * @since 1.23
1124          */
1125         public static function revisionday( $parser, $title = null ) {
1126                 $t = Title::newFromText( $title );
1127                 if ( is_null( $t ) ) {
1128                         return '';
1129                 }
1130                 // fetch revision from cache/database and return the value
1131                 $rev = self::getCachedRevisionObject( $parser, $t );
1132                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1133         }
1134
1135         /**
1136          * Get the day with leading zeros from the last revision of a specified page.
1137          * @param Parser $parser
1138          * @param string $title Title to get the day from
1139          * @return string
1140          * @since 1.23
1141          */
1142         public static function revisionday2( $parser, $title = null ) {
1143                 $t = Title::newFromText( $title );
1144                 if ( is_null( $t ) ) {
1145                         return '';
1146                 }
1147                 // fetch revision from cache/database and return the value
1148                 $rev = self::getCachedRevisionObject( $parser, $t );
1149                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1150         }
1151
1152         /**
1153          * Get the month with leading zeros from the last revision of a specified page.
1154          * @param Parser $parser
1155          * @param string $title Title to get the month from
1156          * @return string
1157          * @since 1.23
1158          */
1159         public static function revisionmonth( $parser, $title = null ) {
1160                 $t = Title::newFromText( $title );
1161                 if ( is_null( $t ) ) {
1162                         return '';
1163                 }
1164                 // fetch revision from cache/database and return the value
1165                 $rev = self::getCachedRevisionObject( $parser, $t );
1166                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1167         }
1168
1169         /**
1170          * Get the month from the last revision of a specified page.
1171          * @param Parser $parser
1172          * @param string $title Title to get the month from
1173          * @return string
1174          * @since 1.23
1175          */
1176         public static function revisionmonth1( $parser, $title = null ) {
1177                 $t = Title::newFromText( $title );
1178                 if ( is_null( $t ) ) {
1179                         return '';
1180                 }
1181                 // fetch revision from cache/database and return the value
1182                 $rev = self::getCachedRevisionObject( $parser, $t );
1183                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1184         }
1185
1186         /**
1187          * Get the year from the last revision of a specified page.
1188          * @param Parser $parser
1189          * @param string $title Title to get the year from
1190          * @return string
1191          * @since 1.23
1192          */
1193         public static function revisionyear( $parser, $title = null ) {
1194                 $t = Title::newFromText( $title );
1195                 if ( is_null( $t ) ) {
1196                         return '';
1197                 }
1198                 // fetch revision from cache/database and return the value
1199                 $rev = self::getCachedRevisionObject( $parser, $t );
1200                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1201         }
1202
1203         /**
1204          * Get the timestamp from the last revision of a specified page.
1205          * @param Parser $parser
1206          * @param string $title Title to get the timestamp from
1207          * @return string
1208          * @since 1.23
1209          */
1210         public static function revisiontimestamp( $parser, $title = null ) {
1211                 $t = Title::newFromText( $title );
1212                 if ( is_null( $t ) ) {
1213                         return '';
1214                 }
1215                 // fetch revision from cache/database and return the value
1216                 $rev = self::getCachedRevisionObject( $parser, $t );
1217                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1218         }
1219
1220         /**
1221          * Get the user from the last revision of a specified page.
1222          * @param Parser $parser
1223          * @param string $title Title to get the user from
1224          * @return string
1225          * @since 1.23
1226          */
1227         public static function revisionuser( $parser, $title = null ) {
1228                 $t = Title::newFromText( $title );
1229                 if ( is_null( $t ) ) {
1230                         return '';
1231                 }
1232                 // fetch revision from cache/database and return the value
1233                 $rev = self::getCachedRevisionObject( $parser, $t );
1234                 return $rev ? $rev->getUserText() : '';
1235         }
1236
1237         /**
1238          * Returns the sources of any cascading protection acting on a specified page.
1239          * Pages will not return their own title unless they transclude themselves.
1240          * This is an expensive parser function and can't be called too many times per page,
1241          * unless cascading protection sources for the page have already been loaded.
1242          *
1243          * @param Parser $parser
1244          * @param string $title
1245          *
1246          * @return string
1247          * @since 1.23
1248          */
1249         public static function cascadingsources( $parser, $title = '' ) {
1250                 $titleObject = Title::newFromText( $title );
1251                 if ( !( $titleObject instanceof Title ) ) {
1252                         $titleObject = $parser->mTitle;
1253                 }
1254                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1255                         || $parser->incrementExpensiveFunctionCount()
1256                 ) {
1257                         $names = array();
1258                         $sources = $titleObject->getCascadeProtectionSources();
1259                         foreach ( $sources[0] as $sourceTitle ) {
1260                                 $names[] = $sourceTitle->getPrefixedText();
1261                         }
1262                         return implode( $names, '|' );
1263                 }
1264                 return '';
1265         }
1266
1267 }