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