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