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                 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                 $forms = array_slice( func_get_args(), 2 );
 313
 314                 // Some shortcuts to avoid loading user data unnecessarily
 315                 if ( count( $forms ) === 0 ) {
 316                         return '';
 317                 } elseif ( count( $forms ) === 1 ) {
 318                         return $forms[0];
 319                 }
 320
 321                 $username = trim( $username );
 322
 323                 // default
 324                 $gender = User::getDefaultOption( 'gender' );
 325
 326                 // allow prefix.
 327                 $title = Title::newFromText( $username );
 328
 329                 if ( $title && $title->getNamespace() == NS_USER ) {
 330                         $username = $title->getText();
 331                 }
 332
 333                 // check parameter, or use the ParserOptions if in interface message
 334                 $user = User::newFromName( $username );
 335                 if ( $user ) {
 336                         $gender = GenderCache::singleton()->getGenderOf( $user, __METHOD__ );
 337                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 338                         $gender = GenderCache::singleton()->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 339                 }
 340                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 341                 return $ret;
 342         }
 343
 344         /**
 345          * @param Parser $parser
 346          * @param string $text
 347          * @return string
 348          */
 349         public static function plural( $parser, $text = '' ) {
 350                 $forms = array_slice( func_get_args(), 2 );
 351                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 352                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 353                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 354         }
 355
 356         /**
 357          * @param Parser $parser
 358          * @param string $text
 359          * @return string
 360          */
 361         public static function bidi( $parser, $text = '' ) {
 362                 return $parser->getFunctionLang()->embedBidi( $text );
 363         }
 364
 365         /**
 366          * Override the title of the page when viewed, provided we've been given a
 367          * title which will normalise to the canonical title
 368          *
 369          * @param Parser $parser Parent parser
 370          * @param string $text Desired title text
 371          * @param string $uarg
 372          * @return string
 373          */
 374         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 375                 global $wgRestrictDisplayTitle;
 376
 377                 static $magicWords = null;
 378                 if ( is_null( $magicWords ) ) {
 379                         $magicWords = new MagicWordArray( array( 'displaytitle_noerror', 'displaytitle_noreplace' ) );
 380                 }
 381                 $arg = $magicWords->matchStartToEnd( $uarg );
 382
 383                 // parse a limited subset of wiki markup (just the single quote items)
 384                 $text = $parser->doQuotes( $text );
 385
 386                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 387                 $text = $parser->killMarkers( $text );
 388
 389                 // list of disallowed tags for DISPLAYTITLE
 390                 // these will be escaped even though they are allowed in normal wiki text
 391                 $bad = array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 392                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' );
 393
 394                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 395                 if ( $wgRestrictDisplayTitle ) {
 396                         $htmlTagsCallback = function ( &$params ) {
 397                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 398
 399                                 if ( isset( $decoded['style'] ) ) {
 400                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 401                                         // calling it twice doesn't hurt
 402                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 403
 404                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 405                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 406                                         }
 407                                 }
 408
 409                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 410                         };
 411                 } else {
 412                         $htmlTagsCallback = null;
 413                 }
 414
 415                 // only requested titles that normalize to the actual title are allowed through
 416                 // if $wgRestrictDisplayTitle is true (it is by default)
 417                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 418                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 419                         $text,
 420                         $htmlTagsCallback,
 421                         array(),
 422                         array(),
 423                         $bad
 424                 ) );
 425                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 426
 427                 if ( !$wgRestrictDisplayTitle ||
 428                         ( $title instanceof Title
 429                         && !$title->hasFragment()
 430                         && $title->equals( $parser->mTitle ) )
 431                 ) {
 432                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 433                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 434                                 $parser->mOutput->setDisplayTitle( $text );
 435                         }
 436                         if ( $old !== false && $old !== $text && !$arg ) {
 437                                 $converter = $parser->getConverterLanguage()->getConverter();
 438                                 return '<span class="error">' .
 439                                         wfMessage( 'duplicate-displaytitle',
 440                                                 // Message should be parsed, but these params should only be escaped.
 441                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 442                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 443                                         )->inContentLanguage()->text() .
 444                                         '</span>';
 445                         }
 446                 }
 447
 448                 return '';
 449         }
 450
 451         /**
 452          * Matches the given value against the value of given magic word
 453          *
 454          * @param string $magicword Magic word key
 455          * @param string $value Value to match
 456          * @return bool True on successful match
 457          */
 458         private static function matchAgainstMagicword( $magicword, $value ) {
 459                 $value = trim( strval( $value ) );
 460                 if ( $value === '' ) {
 461                         return false;
 462                 }
 463                 $mwObject = MagicWord::get( $magicword );
 464                 return $mwObject->matchStartToEnd( $value );
 465         }
 466
 467         public static function formatRaw( $num, $raw ) {
 468                 if ( self::matchAgainstMagicword( 'rawsuffix', $raw ) ) {
 469                         return $num;
 470                 } else {
 471                         global $wgContLang;
 472                         return $wgContLang->formatNum( $num );
 473                 }
 474         }
 475         public static function numberofpages( $parser, $raw = null ) {
 476                 return self::formatRaw( SiteStats::pages(), $raw );
 477         }
 478         public static function numberofusers( $parser, $raw = null ) {
 479                 return self::formatRaw( SiteStats::users(), $raw );
 480         }
 481         public static function numberofactiveusers( $parser, $raw = null ) {
 482                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 483         }
 484         public static function numberofarticles( $parser, $raw = null ) {
 485                 return self::formatRaw( SiteStats::articles(), $raw );
 486         }
 487         public static function numberoffiles( $parser, $raw = null ) {
 488                 return self::formatRaw( SiteStats::images(), $raw );
 489         }
 490         public static function numberofadmins( $parser, $raw = null ) {
 491                 return self::formatRaw( SiteStats::numberingroup( 'sysop' ), $raw );
 492         }
 493         public static function numberofedits( $parser, $raw = null ) {
 494                 return self::formatRaw( SiteStats::edits(), $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         /**
 906          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
 907          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
 908          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
 909          *
 910          * @param Parser $parser
 911          * @param string $name
 912          * @param string $argA
 913          * @param string $argB
 914          * @return array|string
 915          */
 916         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
 917                 $file = wfFindFile( $name );
 918
 919                 if ( $argA == 'nowiki' ) {
 920                         // {{filepath: | option [| size] }}
 921                         $isNowiki = true;
 922                         $parsedWidthParam = $parser->parseWidthParam( $argB );
 923                 } else {
 924                         // {{filepath: [| size [|option]] }}
 925                         $parsedWidthParam = $parser->parseWidthParam( $argA );
 926                         $isNowiki = ( $argB == 'nowiki' );
 927                 }
 928
 929                 if ( $file ) {
 930                         $url = $file->getFullUrl();
 931
 932                         // If a size is requested...
 933                         if ( count( $parsedWidthParam ) ) {
 934                                 $mto = $file->transform( $parsedWidthParam );
 935                                 // ... and we can
 936                                 if ( $mto && !$mto->isError() ) {
 937                                         // ... change the URL to point to a thumbnail.
 938                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
 939                                 }
 940                         }
 941                         if ( $isNowiki ) {
 942                                 return array( $url, 'nowiki' => true );
 943                         }
 944                         return $url;
 945                 } else {
 946                         return '';
 947                 }
 948         }
 949
 950         /**
 951          * Parser function to extension tag adaptor
 952          * @param Parser $parser
 953          * @param PPFrame $frame
 954          * @param PPNode[] $args
 955          * @return string
 956          */
 957         public static function tagObj( $parser, $frame, $args ) {
 958                 if ( !count( $args ) ) {
 959                         return '';
 960                 }
 961                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 962
 963                 if ( count( $args ) ) {
 964                         $inner = $frame->expand( array_shift( $args ) );
 965                 } else {
 966                         $inner = null;
 967                 }
 968
 969                 $attributes = array();
 970                 foreach ( $args as $arg ) {
 971                         $bits = $arg->splitArg();
 972                         if ( strval( $bits['index'] ) === '' ) {
 973                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 974                                 $value = trim( $frame->expand( $bits['value'] ) );
 975                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 976                                         $value = isset( $m[1] ) ? $m[1] : '';
 977                                 }
 978                                 $attributes[$name] = $value;
 979                         }
 980                 }
 981
 982                 $stripList = $parser->getStripList();
 983                 if ( !in_array( $tagName, $stripList ) ) {
 984                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
 985                         $attrText = '';
 986                         foreach ( $attributes as $name => $value ) {
 987                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
 988                         }
 989                         if ( $inner === null ) {
 990                                 return "<$tagName$attrText/>";
 991                         }
 992                         return "<$tagName$attrText>$inner</$tagName>";
 993                 }
 994
 995                 $params = array(
 996                         'name' => $tagName,
 997                         'inner' => $inner,
 998                         'attributes' => $attributes,
 999                         'close' => "</$tagName>",
1000                 );
1001                 return $parser->extensionSubstitution( $params, $frame );
1002         }
1003
1004         /**
1005          * Fetched the current revision of the given title and return this.
1006          * Will increment the expensive function count and
1007          * add a template link to get the value refreshed on changes.
1008          * For a given title, which is equal to the current parser title,
1009          * the revision object from the parser is used, when that is the current one
1010          *
1011          * @param Parser $parser
1012          * @param Title $title
1013          * @return Revision
1014          * @since 1.23
1015          */
1016         private static function getCachedRevisionObject( $parser, $title = null ) {
1017                 if ( is_null( $title ) ) {
1018                         return null;
1019                 }
1020
1021                 // Use the revision from the parser itself, when param is the current page
1022                 // and the revision is the current one
1023                 if ( $title->equals( $parser->getTitle() ) ) {
1024                         $parserRev = $parser->getRevisionObject();
1025                         if ( $parserRev && $parserRev->isCurrent() ) {
1026                                 // force reparse after edit with vary-revision flag
1027                                 $parser->getOutput()->setFlag( 'vary-revision' );
1028                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1029                                 return $parserRev;
1030                         }
1031                 }
1032
1033                 // Normalize name for cache
1034                 $page = $title->getPrefixedDBkey();
1035
1036                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1037                         && !$parser->incrementExpensiveFunctionCount() ) {
1038                         return null;
1039                 }
1040                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1041                 $pageID = $rev ? $rev->getPage() : 0;
1042                 $revID = $rev ? $rev->getId() : 0;
1043
1044                 // Register dependency in templatelinks
1045                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1046
1047                 return $rev;
1048         }
1049
1050         /**
1051          * Get the pageid of a specified page
1052          * @param Parser $parser
1053          * @param string $title Title to get the pageid from
1054          * @return int|null|string
1055          * @since 1.23
1056          */
1057         public static function pageid( $parser, $title = null ) {
1058                 $t = Title::newFromText( $title );
1059                 if ( is_null( $t ) ) {
1060                         return '';
1061                 }
1062                 // Use title from parser to have correct pageid after edit
1063                 if ( $t->equals( $parser->getTitle() ) ) {
1064                         $t = $parser->getTitle();
1065                         return $t->getArticleID();
1066                 }
1067
1068                 // These can't have ids
1069                 if ( !$t->canExist() || $t->isExternal() ) {
1070                         return 0;
1071                 }
1072
1073                 // Check the link cache, maybe something already looked it up.
1074                 $linkCache = LinkCache::singleton();
1075                 $pdbk = $t->getPrefixedDBkey();
1076                 $id = $linkCache->getGoodLinkID( $pdbk );
1077                 if ( $id != 0 ) {
1078                         $parser->mOutput->addLink( $t, $id );
1079                         return $id;
1080                 }
1081                 if ( $linkCache->isBadLink( $pdbk ) ) {
1082                         $parser->mOutput->addLink( $t, 0 );
1083                         return $id;
1084                 }
1085
1086                 // We need to load it from the DB, so mark expensive
1087                 if ( $parser->incrementExpensiveFunctionCount() ) {
1088                         $id = $t->getArticleID();
1089                         $parser->mOutput->addLink( $t, $id );
1090                         return $id;
1091                 }
1092                 return null;
1093         }
1094
1095         /**
1096          * Get the id from the last revision of a specified page.
1097          * @param Parser $parser
1098          * @param string $title Title to get the id from
1099          * @return int|null|string
1100          * @since 1.23
1101          */
1102         public static function revisionid( $parser, $title = null ) {
1103                 $t = Title::newFromText( $title );
1104                 if ( is_null( $t ) ) {
1105                         return '';
1106                 }
1107                 // fetch revision from cache/database and return the value
1108                 $rev = self::getCachedRevisionObject( $parser, $t );
1109                 return $rev ? $rev->getId() : '';
1110         }
1111
1112         /**
1113          * Get the day from the last revision of a specified page.
1114          * @param Parser $parser
1115          * @param string $title Title to get the day from
1116          * @return string
1117          * @since 1.23
1118          */
1119         public static function revisionday( $parser, $title = null ) {
1120                 $t = Title::newFromText( $title );
1121                 if ( is_null( $t ) ) {
1122                         return '';
1123                 }
1124                 // fetch revision from cache/database and return the value
1125                 $rev = self::getCachedRevisionObject( $parser, $t );
1126                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1127         }
1128
1129         /**
1130          * Get the day with leading zeros from the last revision of a specified page.
1131          * @param Parser $parser
1132          * @param string $title Title to get the day from
1133          * @return string
1134          * @since 1.23
1135          */
1136         public static function revisionday2( $parser, $title = null ) {
1137                 $t = Title::newFromText( $title );
1138                 if ( is_null( $t ) ) {
1139                         return '';
1140                 }
1141                 // fetch revision from cache/database and return the value
1142                 $rev = self::getCachedRevisionObject( $parser, $t );
1143                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1144         }
1145
1146         /**
1147          * Get the month with leading zeros from the last revision of a specified page.
1148          * @param Parser $parser
1149          * @param string $title Title to get the month from
1150          * @return string
1151          * @since 1.23
1152          */
1153         public static function revisionmonth( $parser, $title = null ) {
1154                 $t = Title::newFromText( $title );
1155                 if ( is_null( $t ) ) {
1156                         return '';
1157                 }
1158                 // fetch revision from cache/database and return the value
1159                 $rev = self::getCachedRevisionObject( $parser, $t );
1160                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1161         }
1162
1163         /**
1164          * Get the month from the last revision of a specified page.
1165          * @param Parser $parser
1166          * @param string $title Title to get the month from
1167          * @return string
1168          * @since 1.23
1169          */
1170         public static function revisionmonth1( $parser, $title = null ) {
1171                 $t = Title::newFromText( $title );
1172                 if ( is_null( $t ) ) {
1173                         return '';
1174                 }
1175                 // fetch revision from cache/database and return the value
1176                 $rev = self::getCachedRevisionObject( $parser, $t );
1177                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1178         }
1179
1180         /**
1181          * Get the year from the last revision of a specified page.
1182          * @param Parser $parser
1183          * @param string $title Title to get the year from
1184          * @return string
1185          * @since 1.23
1186          */
1187         public static function revisionyear( $parser, $title = null ) {
1188                 $t = Title::newFromText( $title );
1189                 if ( is_null( $t ) ) {
1190                         return '';
1191                 }
1192                 // fetch revision from cache/database and return the value
1193                 $rev = self::getCachedRevisionObject( $parser, $t );
1194                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1195         }
1196
1197         /**
1198          * Get the timestamp from the last revision of a specified page.
1199          * @param Parser $parser
1200          * @param string $title Title to get the timestamp from
1201          * @return string
1202          * @since 1.23
1203          */
1204         public static function revisiontimestamp( $parser, $title = null ) {
1205                 $t = Title::newFromText( $title );
1206                 if ( is_null( $t ) ) {
1207                         return '';
1208                 }
1209                 // fetch revision from cache/database and return the value
1210                 $rev = self::getCachedRevisionObject( $parser, $t );
1211                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1212         }
1213
1214         /**
1215          * Get the user from the last revision of a specified page.
1216          * @param Parser $parser
1217          * @param string $title Title to get the user from
1218          * @return string
1219          * @since 1.23
1220          */
1221         public static function revisionuser( $parser, $title = null ) {
1222                 $t = Title::newFromText( $title );
1223                 if ( is_null( $t ) ) {
1224                         return '';
1225                 }
1226                 // fetch revision from cache/database and return the value
1227                 $rev = self::getCachedRevisionObject( $parser, $t );
1228                 return $rev ? $rev->getUserText() : '';
1229         }
1230
1231         /**
1232          * Returns the sources of any cascading protection acting on a specified page.
1233          * Pages will not return their own title unless they transclude themselves.
1234          * This is an expensive parser function and can't be called too many times per page,
1235          * unless cascading protection sources for the page have already been loaded.
1236          *
1237          * @param Parser $parser
1238          * @param string $title
1239          *
1240          * @return string
1241          * @since 1.23
1242          */
1243         public static function cascadingsources( $parser, $title = '' ) {
1244                 $titleObject = Title::newFromText( $title );
1245                 if ( !( $titleObject instanceof Title ) ) {
1246                         $titleObject = $parser->mTitle;
1247                 }
1248                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1249                         || $parser->incrementExpensiveFunctionCount()
1250                 ) {
1251                         $names = array();
1252                         $sources = $titleObject->getCascadeProtectionSources();
1253                         foreach ( $sources[0] as $sourceTitle ) {
1254                                 $names[] = $sourceTitle->getPrefixedText();
1255                         }
1256                         return implode( $names, '|' );
1257                 }
1258                 return '';
1259         }
1260
1261 }