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 = [
  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', 'protectionexpiry',
  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, [ __CLASS__, $func ], Parser::SFH_NO_HASH );
  61                 }
  62
  63                 $parser->setFunctionHook(
  64                         'namespace',
  65                         [ __CLASS__, 'mwnamespace' ],
  66                         Parser::SFH_NO_HASH
  67                 );
  68                 $parser->setFunctionHook( 'int', [ __CLASS__, 'intFunction' ], Parser::SFH_NO_HASH );
  69                 $parser->setFunctionHook( 'special', [ __CLASS__, 'special' ] );
  70                 $parser->setFunctionHook( 'speciale', [ __CLASS__, 'speciale' ] );
  71                 $parser->setFunctionHook( 'tag', [ __CLASS__, 'tagObj' ], Parser::SFH_OBJECT_ARGS );
  72                 $parser->setFunctionHook( 'formatdate', [ __CLASS__, 'formatDate' ] );
  73
  74                 if ( $wgAllowDisplayTitle ) {
  75                         $parser->setFunctionHook(
  76                                 'displaytitle',
  77                                 [ __CLASS__, 'displaytitle' ],
  78                                 Parser::SFH_NO_HASH
  79                         );
  80                 }
  81                 if ( $wgAllowSlowParserFunctions ) {
  82                         $parser->setFunctionHook(
  83                                 'pagesinnamespace',
  84                                 [ __CLASS__, 'pagesinnamespace' ],
  85                                 Parser::SFH_NO_HASH
  86                         );
  87                 }
  88         }
  89
  90         /**
  91          * @param Parser $parser
  92          * @param string $part1
  93          * @return array
  94          */
  95         public static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  96                 if ( strval( $part1 ) !== '' ) {
  97                         $args = array_slice( func_get_args(), 2 );
  98                         $message = wfMessage( $part1, $args )
  99                                 ->inLanguage( $parser->getOptions()->getUserLangObj() );
 100                         if ( !$message->exists() ) {
 101                                 // When message does not exists, the message name is surrounded by angle
 102                                 // and can result in a tag, therefore escape the angles
 103                                 return $message->escaped();
 104                         }
 105                         return [ $message->plain(), 'noparse' => false ];
 106                 } else {
 107                         return [ 'found' => false ];
 108                 }
 109         }
 110
 111         /**
 112          * @param Parser $parser
 113          * @param string $date
 114          * @param string $defaultPref
 115          *
 116          * @return string
 117          */
 118         public static function formatDate( $parser, $date, $defaultPref = null ) {
 119                 $lang = $parser->getFunctionLang();
 120                 $df = DateFormatter::getInstance( $lang );
 121
 122                 $date = trim( $date );
 123
 124                 $pref = $parser->getOptions()->getDateFormat();
 125
 126                 // Specify a different default date format other than the normal default
 127                 // if the user has 'default' for their setting
 128                 if ( $pref == 'default' && $defaultPref ) {
 129                         $pref = $defaultPref;
 130                 }
 131
 132                 $date = $df->reformat( $pref, $date, [ 'match-whole' ] );
 133                 return $date;
 134         }
 135
 136         public static function ns( $parser, $part1 = '' ) {
 137                 global $wgContLang;
 138                 if ( intval( $part1 ) || $part1 == "0" ) {
 139                         $index = intval( $part1 );
 140                 } else {
 141                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 142                 }
 143                 if ( $index !== false ) {
 144                         return $wgContLang->getFormattedNsText( $index );
 145                 } else {
 146                         return [ 'found' => false ];
 147                 }
 148         }
 149
 150         public static function nse( $parser, $part1 = '' ) {
 151                 $ret = self::ns( $parser, $part1 );
 152                 if ( is_string( $ret ) ) {
 153                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 154                 }
 155                 return $ret;
 156         }
 157
 158         /**
 159          * urlencodes a string according to one of three patterns: (bug 22474)
 160          *
 161          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 162          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 163          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 164          *
 165          * @param Parser $parser
 166          * @param string $s The text to encode.
 167          * @param string $arg (optional): The type of encoding.
 168          * @return string
 169          */
 170         public static function urlencode( $parser, $s = '', $arg = null ) {
 171                 static $magicWords = null;
 172                 if ( is_null( $magicWords ) ) {
 173                         $magicWords = new MagicWordArray( [ 'url_path', 'url_query', 'url_wiki' ] );
 174                 }
 175                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 176
 177                         // Encode as though it's a wiki page, '_' for ' '.
 178                         case 'url_wiki':
 179                                 $func = 'wfUrlencode';
 180                                 $s = str_replace( ' ', '_', $s );
 181                                 break;
 182
 183                         // Encode for an HTTP Path, '%20' for ' '.
 184                         case 'url_path':
 185                                 $func = 'rawurlencode';
 186                                 break;
 187
 188                         // Encode for HTTP query, '+' for ' '.
 189                         case 'url_query':
 190                         default:
 191                                 $func = 'urlencode';
 192                 }
 193                 // See T105242, where the choice to kill markers and various
 194                 // other options were discussed.
 195                 return $func( $parser->killMarkers( $s ) );
 196         }
 197
 198         public static function lcfirst( $parser, $s = '' ) {
 199                 global $wgContLang;
 200                 return $wgContLang->lcfirst( $s );
 201         }
 202
 203         public static function ucfirst( $parser, $s = '' ) {
 204                 global $wgContLang;
 205                 return $wgContLang->ucfirst( $s );
 206         }
 207
 208         /**
 209          * @param Parser $parser
 210          * @param string $s
 211          * @return string
 212          */
 213         public static function lc( $parser, $s = '' ) {
 214                 global $wgContLang;
 215                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'lc' ] );
 216         }
 217
 218         /**
 219          * @param Parser $parser
 220          * @param string $s
 221          * @return string
 222          */
 223         public static function uc( $parser, $s = '' ) {
 224                 global $wgContLang;
 225                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'uc' ] );
 226         }
 227
 228         public static function localurl( $parser, $s = '', $arg = null ) {
 229                 return self::urlFunction( 'getLocalURL', $s, $arg );
 230         }
 231
 232         public static function localurle( $parser, $s = '', $arg = null ) {
 233                 $temp = self::urlFunction( 'getLocalURL', $s, $arg );
 234                 if ( !is_string( $temp ) ) {
 235                         return $temp;
 236                 } else {
 237                         return htmlspecialchars( $temp );
 238                 }
 239         }
 240
 241         public static function fullurl( $parser, $s = '', $arg = null ) {
 242                 return self::urlFunction( 'getFullURL', $s, $arg );
 243         }
 244
 245         public static function fullurle( $parser, $s = '', $arg = null ) {
 246                 $temp = self::urlFunction( 'getFullURL', $s, $arg );
 247                 if ( !is_string( $temp ) ) {
 248                         return $temp;
 249                 } else {
 250                         return htmlspecialchars( $temp );
 251                 }
 252         }
 253
 254         public static function canonicalurl( $parser, $s = '', $arg = null ) {
 255                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 256         }
 257
 258         public static function canonicalurle( $parser, $s = '', $arg = null ) {
 259                 $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
 260                 if ( !is_string( $temp ) ) {
 261                         return $temp;
 262                 } else {
 263                         return htmlspecialchars( $temp );
 264                 }
 265         }
 266
 267         public static function urlFunction( $func, $s = '', $arg = null ) {
 268                 $title = Title::newFromText( $s );
 269                 # Due to order of execution of a lot of bits, the values might be encoded
 270                 # before arriving here; if that's true, then the title can't be created
 271                 # and the variable will fail. If we can't get a decent title from the first
 272                 # attempt, url-decode and try for a second.
 273                 if ( is_null( $title ) ) {
 274                         $title = Title::newFromURL( urldecode( $s ) );
 275                 }
 276                 if ( !is_null( $title ) ) {
 277                         # Convert NS_MEDIA -> NS_FILE
 278                         if ( $title->getNamespace() == NS_MEDIA ) {
 279                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 280                         }
 281                         if ( !is_null( $arg ) ) {
 282                                 $text = $title->$func( $arg );
 283                         } else {
 284                                 $text = $title->$func();
 285                         }
 286                         return $text;
 287                 } else {
 288                         return [ 'found' => false ];
 289                 }
 290         }
 291
 292         /**
 293          * @param Parser $parser
 294          * @param string $num
 295          * @param string $arg
 296          * @return string
 297          */
 298         public static function formatnum( $parser, $num = '', $arg = null ) {
 299                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg ) ) {
 300                         $func = [ $parser->getFunctionLang(), 'parseFormattedNumber' ];
 301                 } elseif ( self::matchAgainstMagicword( 'nocommafysuffix', $arg ) ) {
 302                         $func = [ $parser->getFunctionLang(), 'formatNumNoSeparators' ];
 303                 } else {
 304                         $func = [ $parser->getFunctionLang(), 'formatNum' ];
 305                 }
 306                 return $parser->markerSkipCallback( $num, $func );
 307         }
 308
 309         /**
 310          * @param Parser $parser
 311          * @param string $case
 312          * @param string $word
 313          * @return string
 314          */
 315         public static function grammar( $parser, $case = '', $word = '' ) {
 316                 $word = $parser->killMarkers( $word );
 317                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 318         }
 319
 320         /**
 321          * @param Parser $parser
 322          * @param string $username
 323          * @return string
 324          */
 325         public static function gender( $parser, $username ) {
 326                 $forms = array_slice( func_get_args(), 2 );
 327
 328                 // Some shortcuts to avoid loading user data unnecessarily
 329                 if ( count( $forms ) === 0 ) {
 330                         return '';
 331                 } elseif ( count( $forms ) === 1 ) {
 332                         return $forms[0];
 333                 }
 334
 335                 $username = trim( $username );
 336
 337                 // default
 338                 $gender = User::getDefaultOption( 'gender' );
 339
 340                 // allow prefix.
 341                 $title = Title::newFromText( $username );
 342
 343                 if ( $title && $title->getNamespace() == NS_USER ) {
 344                         $username = $title->getText();
 345                 }
 346
 347                 // check parameter, or use the ParserOptions if in interface message
 348                 $user = User::newFromName( $username );
 349                 if ( $user ) {
 350                         $gender = GenderCache::singleton()->getGenderOf( $user, __METHOD__ );
 351                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 352                         $gender = GenderCache::singleton()->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 353                 }
 354                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 355                 return $ret;
 356         }
 357
 358         /**
 359          * @param Parser $parser
 360          * @param string $text
 361          * @return string
 362          */
 363         public static function plural( $parser, $text = '' ) {
 364                 $forms = array_slice( func_get_args(), 2 );
 365                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 366                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 367                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 368         }
 369
 370         /**
 371          * @param Parser $parser
 372          * @param string $text
 373          * @return string
 374          */
 375         public static function bidi( $parser, $text = '' ) {
 376                 return $parser->getFunctionLang()->embedBidi( $text );
 377         }
 378
 379         /**
 380          * Override the title of the page when viewed, provided we've been given a
 381          * title which will normalise to the canonical title
 382          *
 383          * @param Parser $parser Parent parser
 384          * @param string $text Desired title text
 385          * @param string $uarg
 386          * @return string
 387          */
 388         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 389                 global $wgRestrictDisplayTitle;
 390
 391                 static $magicWords = null;
 392                 if ( is_null( $magicWords ) ) {
 393                         $magicWords = new MagicWordArray( [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
 394                 }
 395                 $arg = $magicWords->matchStartToEnd( $uarg );
 396
 397                 // parse a limited subset of wiki markup (just the single quote items)
 398                 $text = $parser->doQuotes( $text );
 399
 400                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 401                 $text = $parser->killMarkers( $text );
 402
 403                 // list of disallowed tags for DISPLAYTITLE
 404                 // these will be escaped even though they are allowed in normal wiki text
 405                 $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 406                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];
 407
 408                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 409                 if ( $wgRestrictDisplayTitle ) {
 410                         $htmlTagsCallback = function ( &$params ) {
 411                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 412
 413                                 if ( isset( $decoded['style'] ) ) {
 414                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 415                                         // calling it twice doesn't hurt
 416                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 417
 418                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 419                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 420                                         }
 421                                 }
 422
 423                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 424                         };
 425                 } else {
 426                         $htmlTagsCallback = null;
 427                 }
 428
 429                 // only requested titles that normalize to the actual title are allowed through
 430                 // if $wgRestrictDisplayTitle is true (it is by default)
 431                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 432                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 433                         $text,
 434                         $htmlTagsCallback,
 435                         [],
 436                         [],
 437                         $bad
 438                 ) );
 439                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 440
 441                 if ( !$wgRestrictDisplayTitle ||
 442                         ( $title instanceof Title
 443                         && !$title->hasFragment()
 444                         && $title->equals( $parser->mTitle ) )
 445                 ) {
 446                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 447                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 448                                 $parser->mOutput->setDisplayTitle( $text );
 449                         }
 450                         if ( $old !== false && $old !== $text && !$arg ) {
 451                                 $converter = $parser->getConverterLanguage()->getConverter();
 452                                 return '<span class="error">' .
 453                                         wfMessage( 'duplicate-displaytitle',
 454                                                 // Message should be parsed, but these params should only be escaped.
 455                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 456                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 457                                         )->inContentLanguage()->text() .
 458                                         '</span>';
 459                         } else {
 460                                 return '';
 461                         }
 462                 } else {
 463                         $converter = $parser->getConverterLanguage()->getConverter();
 464                         $parser->getOutput()->addWarning(
 465                                 wfMessage( 'restricted-displaytitle',
 466                                         // Message should be parsed, but this param should only be escaped.
 467                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 468                                 )->text()
 469                         );
 470                         $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
 471                 }
 472         }
 473
 474         /**
 475          * Matches the given value against the value of given magic word
 476          *
 477          * @param string $magicword Magic word key
 478          * @param string $value Value to match
 479          * @return bool True on successful match
 480          */
 481         private static function matchAgainstMagicword( $magicword, $value ) {
 482                 $value = trim( strval( $value ) );
 483                 if ( $value === '' ) {
 484                         return false;
 485                 }
 486                 $mwObject = MagicWord::get( $magicword );
 487                 return $mwObject->matchStartToEnd( $value );
 488         }
 489
 490         public static function formatRaw( $num, $raw ) {
 491                 if ( self::matchAgainstMagicword( 'rawsuffix', $raw ) ) {
 492                         return $num;
 493                 } else {
 494                         global $wgContLang;
 495                         return $wgContLang->formatNum( $num );
 496                 }
 497         }
 498         public static function numberofpages( $parser, $raw = null ) {
 499                 return self::formatRaw( SiteStats::pages(), $raw );
 500         }
 501         public static function numberofusers( $parser, $raw = null ) {
 502                 return self::formatRaw( SiteStats::users(), $raw );
 503         }
 504         public static function numberofactiveusers( $parser, $raw = null ) {
 505                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 506         }
 507         public static function numberofarticles( $parser, $raw = null ) {
 508                 return self::formatRaw( SiteStats::articles(), $raw );
 509         }
 510         public static function numberoffiles( $parser, $raw = null ) {
 511                 return self::formatRaw( SiteStats::images(), $raw );
 512         }
 513         public static function numberofadmins( $parser, $raw = null ) {
 514                 return self::formatRaw( SiteStats::numberingroup( 'sysop' ), $raw );
 515         }
 516         public static function numberofedits( $parser, $raw = null ) {
 517                 return self::formatRaw( SiteStats::edits(), $raw );
 518         }
 519         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 520                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 521         }
 522         public static function numberingroup( $parser, $name = '', $raw = null ) {
 523                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 524         }
 525
 526         /**
 527          * Given a title, return the namespace name that would be given by the
 528          * corresponding magic word
 529          * Note: function name changed to "mwnamespace" rather than "namespace"
 530          * to not break PHP 5.3
 531          * @param Parser $parser
 532          * @param string $title
 533          * @return mixed|string
 534          */
 535         public static function mwnamespace( $parser, $title = null ) {
 536                 $t = Title::newFromText( $title );
 537                 if ( is_null( $t ) ) {
 538                         return '';
 539                 }
 540                 return str_replace( '_', ' ', $t->getNsText() );
 541         }
 542         public static function namespacee( $parser, $title = null ) {
 543                 $t = Title::newFromText( $title );
 544                 if ( is_null( $t ) ) {
 545                         return '';
 546                 }
 547                 return wfUrlencode( $t->getNsText() );
 548         }
 549         public static function namespacenumber( $parser, $title = null ) {
 550                 $t = Title::newFromText( $title );
 551                 if ( is_null( $t ) ) {
 552                         return '';
 553                 }
 554                 return $t->getNamespace();
 555         }
 556         public static function talkspace( $parser, $title = null ) {
 557                 $t = Title::newFromText( $title );
 558                 if ( is_null( $t ) || !$t->canTalk() ) {
 559                         return '';
 560                 }
 561                 return str_replace( '_', ' ', $t->getTalkNsText() );
 562         }
 563         public static function talkspacee( $parser, $title = null ) {
 564                 $t = Title::newFromText( $title );
 565                 if ( is_null( $t ) || !$t->canTalk() ) {
 566                         return '';
 567                 }
 568                 return wfUrlencode( $t->getTalkNsText() );
 569         }
 570         public static function subjectspace( $parser, $title = null ) {
 571                 $t = Title::newFromText( $title );
 572                 if ( is_null( $t ) ) {
 573                         return '';
 574                 }
 575                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 576         }
 577         public static function subjectspacee( $parser, $title = null ) {
 578                 $t = Title::newFromText( $title );
 579                 if ( is_null( $t ) ) {
 580                         return '';
 581                 }
 582                 return wfUrlencode( $t->getSubjectNsText() );
 583         }
 584
 585         /**
 586          * Functions to get and normalize pagenames, corresponding to the magic words
 587          * of the same names
 588          * @param Parser $parser
 589          * @param string $title
 590          * @return string
 591          */
 592         public static function pagename( $parser, $title = null ) {
 593                 $t = Title::newFromText( $title );
 594                 if ( is_null( $t ) ) {
 595                         return '';
 596                 }
 597                 return wfEscapeWikiText( $t->getText() );
 598         }
 599         public static function pagenamee( $parser, $title = null ) {
 600                 $t = Title::newFromText( $title );
 601                 if ( is_null( $t ) ) {
 602                         return '';
 603                 }
 604                 return wfEscapeWikiText( $t->getPartialURL() );
 605         }
 606         public static function fullpagename( $parser, $title = null ) {
 607                 $t = Title::newFromText( $title );
 608                 if ( is_null( $t ) || !$t->canTalk() ) {
 609                         return '';
 610                 }
 611                 return wfEscapeWikiText( $t->getPrefixedText() );
 612         }
 613         public static function fullpagenamee( $parser, $title = null ) {
 614                 $t = Title::newFromText( $title );
 615                 if ( is_null( $t ) || !$t->canTalk() ) {
 616                         return '';
 617                 }
 618                 return wfEscapeWikiText( $t->getPrefixedURL() );
 619         }
 620         public static function subpagename( $parser, $title = null ) {
 621                 $t = Title::newFromText( $title );
 622                 if ( is_null( $t ) ) {
 623                         return '';
 624                 }
 625                 return wfEscapeWikiText( $t->getSubpageText() );
 626         }
 627         public static function subpagenamee( $parser, $title = null ) {
 628                 $t = Title::newFromText( $title );
 629                 if ( is_null( $t ) ) {
 630                         return '';
 631                 }
 632                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 633         }
 634         public static function rootpagename( $parser, $title = null ) {
 635                 $t = Title::newFromText( $title );
 636                 if ( is_null( $t ) ) {
 637                         return '';
 638                 }
 639                 return wfEscapeWikiText( $t->getRootText() );
 640         }
 641         public static function rootpagenamee( $parser, $title = null ) {
 642                 $t = Title::newFromText( $title );
 643                 if ( is_null( $t ) ) {
 644                         return '';
 645                 }
 646                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
 647         }
 648         public static function basepagename( $parser, $title = null ) {
 649                 $t = Title::newFromText( $title );
 650                 if ( is_null( $t ) ) {
 651                         return '';
 652                 }
 653                 return wfEscapeWikiText( $t->getBaseText() );
 654         }
 655         public static function basepagenamee( $parser, $title = null ) {
 656                 $t = Title::newFromText( $title );
 657                 if ( is_null( $t ) ) {
 658                         return '';
 659                 }
 660                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 661         }
 662         public static function talkpagename( $parser, $title = null ) {
 663                 $t = Title::newFromText( $title );
 664                 if ( is_null( $t ) || !$t->canTalk() ) {
 665                         return '';
 666                 }
 667                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 668         }
 669         public static function talkpagenamee( $parser, $title = null ) {
 670                 $t = Title::newFromText( $title );
 671                 if ( is_null( $t ) || !$t->canTalk() ) {
 672                         return '';
 673                 }
 674                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 675         }
 676         public static function subjectpagename( $parser, $title = null ) {
 677                 $t = Title::newFromText( $title );
 678                 if ( is_null( $t ) ) {
 679                         return '';
 680                 }
 681                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 682         }
 683         public static function subjectpagenamee( $parser, $title = null ) {
 684                 $t = Title::newFromText( $title );
 685                 if ( is_null( $t ) ) {
 686                         return '';
 687                 }
 688                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 689         }
 690
 691         /**
 692          * Return the number of pages, files or subcats in the given category,
 693          * or 0 if it's nonexistent. This is an expensive parser function and
 694          * can't be called too many times per page.
 695          * @param Parser $parser
 696          * @param string $name
 697          * @param string $arg1
 698          * @param string $arg2
 699          * @return string
 700          */
 701         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 702                 global $wgContLang;
 703                 static $magicWords = null;
 704                 if ( is_null( $magicWords ) ) {
 705                         $magicWords = new MagicWordArray( [
 706                                 'pagesincategory_all',
 707                                 'pagesincategory_pages',
 708                                 'pagesincategory_subcats',
 709                                 'pagesincategory_files'
 710                         ] );
 711                 }
 712                 static $cache = [];
 713
 714                 // split the given option to its variable
 715                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg1 ) ) {
 716                         // {{pagesincategory:|raw[|type]}}
 717                         $raw = $arg1;
 718                         $type = $magicWords->matchStartToEnd( $arg2 );
 719                 } else {
 720                         // {{pagesincategory:[|type[|raw]]}}
 721                         $type = $magicWords->matchStartToEnd( $arg1 );
 722                         $raw = $arg2;
 723                 }
 724                 if ( !$type ) { // backward compatibility
 725                         $type = 'pagesincategory_all';
 726                 }
 727
 728                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 729                 if ( !$title ) { # invalid title
 730                         return self::formatRaw( 0, $raw );
 731                 }
 732                 $wgContLang->findVariantLink( $name, $title, true );
 733
 734                 // Normalize name for cache
 735                 $name = $title->getDBkey();
 736
 737                 if ( !isset( $cache[$name] ) ) {
 738                         $category = Category::newFromTitle( $title );
 739
 740                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 741                         if ( $parser->incrementExpensiveFunctionCount() ) {
 742                                 // $allCount is the total number of cat members,
 743                                 // not the count of how many members are normal pages.
 744                                 $allCount = (int)$category->getPageCount();
 745                                 $subcatCount = (int)$category->getSubcatCount();
 746                                 $fileCount = (int)$category->getFileCount();
 747                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 748                         }
 749                         $cache[$name]['pagesincategory_all'] = $allCount;
 750                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 751                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 752                         $cache[$name]['pagesincategory_files'] = $fileCount;
 753                 }
 754
 755                 $count = $cache[$name][$type];
 756                 return self::formatRaw( $count, $raw );
 757         }
 758
 759         /**
 760          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 761          * expensive parser function and can't be called too many times per page.
 762          *
 763          * @param Parser $parser
 764          * @param string $page Name of page to check (Default: empty string)
 765          * @param string $raw Should number be human readable with commas or just number
 766          * @return string
 767          */
 768         public static function pagesize( $parser, $page = '', $raw = null ) {
 769                 $title = Title::newFromText( $page );
 770
 771                 if ( !is_object( $title ) ) {
 772                         return self::formatRaw( 0, $raw );
 773                 }
 774
 775                 // fetch revision from cache/database and return the value
 776                 $rev = self::getCachedRevisionObject( $parser, $title );
 777                 $length = $rev ? $rev->getSize() : 0;
 778                 if ( $length === null ) {
 779                         // We've had bugs where rev_len was not being recorded for empty pages, see T135414
 780                         $length = 0;
 781                 }
 782                 return self::formatRaw( $length, $raw );
 783         }
 784
 785         /**
 786          * Returns the requested protection level for the current page. This
 787          * is an expensive parser function and can't be called too many times
 788          * per page, unless the protection levels/expiries for the given title
 789          * have already been retrieved
 790          *
 791          * @param Parser $parser
 792          * @param string $type
 793          * @param string $title
 794          *
 795          * @return string
 796          */
 797         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 798                 $titleObject = Title::newFromText( $title );
 799                 if ( !( $titleObject instanceof Title ) ) {
 800                         $titleObject = $parser->mTitle;
 801                 }
 802                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 803                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 804                         # Title::getRestrictions returns an array, its possible it may have
 805                         # multiple values in the future
 806                         return implode( $restrictions, ',' );
 807                 }
 808                 return '';
 809         }
 810
 811         /**
 812          * Returns the requested protection expiry for the current page. This
 813          * is an expensive parser function and can't be called too many times
 814          * per page, unless the protection levels/expiries for the given title
 815          * have already been retrieved
 816          *
 817          * @param Parser $parser
 818          * @param string $type
 819          * @param string $title
 820          *
 821          * @return string
 822          */
 823         public static function protectionexpiry( $parser, $type = '', $title = '' ) {
 824                 $titleObject = Title::newFromText( $title );
 825                 if ( !( $titleObject instanceof Title ) ) {
 826                         $titleObject = $parser->mTitle;
 827                 }
 828                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 829                         $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
 830                         // getRestrictionExpiry() returns false on invalid type; trying to
 831                         // match protectionlevel() function that returns empty string instead
 832                         if ( $expiry === false ) {
 833                                 $expiry = '';
 834                         }
 835                         return $expiry;
 836                 }
 837                 return '';
 838         }
 839
 840         /**
 841          * Gives language names.
 842          * @param Parser $parser
 843          * @param string $code Language code (of which to get name)
 844          * @param string $inLanguage Language code (in which to get name)
 845          * @return string
 846          */
 847         public static function language( $parser, $code = '', $inLanguage = '' ) {
 848                 $code = strtolower( $code );
 849                 $inLanguage = strtolower( $inLanguage );
 850                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 851                 return $lang !== '' ? $lang : wfBCP47( $code );
 852         }
 853
 854         /**
 855          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 856          * @param Parser $parser
 857          * @param string $string
 858          * @param int $length
 859          * @param string $padding
 860          * @param int $direction
 861          * @return string
 862          */
 863         public static function pad(
 864                 $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
 865         ) {
 866                 $padding = $parser->killMarkers( $padding );
 867                 $lengthOfPadding = mb_strlen( $padding );
 868                 if ( $lengthOfPadding == 0 ) {
 869                         return $string;
 870                 }
 871
 872                 # The remaining length to add counts down to 0 as padding is added
 873                 $length = min( $length, 500 ) - mb_strlen( $string );
 874                 # $finalPadding is just $padding repeated enough times so that
 875                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 876                 $finalPadding = '';
 877                 while ( $length > 0 ) {
 878                         # If $length < $lengthofPadding, truncate $padding so we get the
 879                         # exact length desired.
 880                         $finalPadding .= mb_substr( $padding, 0, $length );
 881                         $length -= $lengthOfPadding;
 882                 }
 883
 884                 if ( $direction == STR_PAD_LEFT ) {
 885                         return $finalPadding . $string;
 886                 } else {
 887                         return $string . $finalPadding;
 888                 }
 889         }
 890
 891         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 892                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 893         }
 894
 895         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 896                 return self::pad( $parser, $string, $length, $padding );
 897         }
 898
 899         /**
 900          * @param Parser $parser
 901          * @param string $text
 902          * @return string
 903          */
 904         public static function anchorencode( $parser, $text ) {
 905                 $text = $parser->killMarkers( $text );
 906                 return (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 907         }
 908
 909         public static function special( $parser, $text ) {
 910                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 911                 if ( $page ) {
 912                         $title = SpecialPage::getTitleFor( $page, $subpage );
 913                         return $title->getPrefixedText();
 914                 } else {
 915                         // unknown special page, just use the given text as its title, if at all possible
 916                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 917                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 918                 }
 919         }
 920
 921         public static function speciale( $parser, $text ) {
 922                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 923         }
 924
 925         /**
 926          * @param Parser $parser
 927          * @param string $text The sortkey to use
 928          * @param string $uarg Either "noreplace" or "noerror" (in en)
 929          *   both suppress errors, and noreplace does nothing if
 930          *   a default sortkey already exists.
 931          * @return string
 932          */
 933         public static function defaultsort( $parser, $text, $uarg = '' ) {
 934                 static $magicWords = null;
 935                 if ( is_null( $magicWords ) ) {
 936                         $magicWords = new MagicWordArray( [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
 937                 }
 938                 $arg = $magicWords->matchStartToEnd( $uarg );
 939
 940                 $text = trim( $text );
 941                 if ( strlen( $text ) == 0 ) {
 942                         return '';
 943                 }
 944                 $old = $parser->getCustomDefaultSort();
 945                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 946                         $parser->setDefaultSort( $text );
 947                 }
 948
 949                 if ( $old === false || $old == $text || $arg ) {
 950                         return '';
 951                 } else {
 952                         $converter = $parser->getConverterLanguage()->getConverter();
 953                         return '<span class="error">' .
 954                                 wfMessage( 'duplicate-defaultsort',
 955                                         // Message should be parsed, but these params should only be escaped.
 956                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 957                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 958                                 )->inContentLanguage()->text() .
 959                                 '</span>';
 960                 }
 961         }
 962
 963         /**
 964          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
 965          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
 966          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
 967          *
 968          * @param Parser $parser
 969          * @param string $name
 970          * @param string $argA
 971          * @param string $argB
 972          * @return array|string
 973          */
 974         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
 975                 $file = wfFindFile( $name );
 976
 977                 if ( $argA == 'nowiki' ) {
 978                         // {{filepath: | option [| size] }}
 979                         $isNowiki = true;
 980                         $parsedWidthParam = $parser->parseWidthParam( $argB );
 981                 } else {
 982                         // {{filepath: [| size [|option]] }}
 983                         $parsedWidthParam = $parser->parseWidthParam( $argA );
 984                         $isNowiki = ( $argB == 'nowiki' );
 985                 }
 986
 987                 if ( $file ) {
 988                         $url = $file->getFullUrl();
 989
 990                         // If a size is requested...
 991                         if ( count( $parsedWidthParam ) ) {
 992                                 $mto = $file->transform( $parsedWidthParam );
 993                                 // ... and we can
 994                                 if ( $mto && !$mto->isError() ) {
 995                                         // ... change the URL to point to a thumbnail.
 996                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
 997                                 }
 998                         }
 999                         if ( $isNowiki ) {
1000                                 return [ $url, 'nowiki' => true ];
1001                         }
1002                         return $url;
1003                 } else {
1004                         return '';
1005                 }
1006         }
1007
1008         /**
1009          * Parser function to extension tag adaptor
1010          * @param Parser $parser
1011          * @param PPFrame $frame
1012          * @param PPNode[] $args
1013          * @return string
1014          */
1015         public static function tagObj( $parser, $frame, $args ) {
1016                 if ( !count( $args ) ) {
1017                         return '';
1018                 }
1019                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
1020
1021                 if ( count( $args ) ) {
1022                         $inner = $frame->expand( array_shift( $args ) );
1023                 } else {
1024                         $inner = null;
1025                 }
1026
1027                 $attributes = [];
1028                 foreach ( $args as $arg ) {
1029                         $bits = $arg->splitArg();
1030                         if ( strval( $bits['index'] ) === '' ) {
1031                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1032                                 $value = trim( $frame->expand( $bits['value'] ) );
1033                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
1034                                         $value = isset( $m[1] ) ? $m[1] : '';
1035                                 }
1036                                 $attributes[$name] = $value;
1037                         }
1038                 }
1039
1040                 $stripList = $parser->getStripList();
1041                 if ( !in_array( $tagName, $stripList ) ) {
1042                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
1043                         $attrText = '';
1044                         foreach ( $attributes as $name => $value ) {
1045                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
1046                         }
1047                         if ( $inner === null ) {
1048                                 return "<$tagName$attrText/>";
1049                         }
1050                         return "<$tagName$attrText>$inner</$tagName>";
1051                 }
1052
1053                 $params = [
1054                         'name' => $tagName,
1055                         'inner' => $inner,
1056                         'attributes' => $attributes,
1057                         'close' => "</$tagName>",
1058                 ];
1059                 return $parser->extensionSubstitution( $params, $frame );
1060         }
1061
1062         /**
1063          * Fetched the current revision of the given title and return this.
1064          * Will increment the expensive function count and
1065          * add a template link to get the value refreshed on changes.
1066          * For a given title, which is equal to the current parser title,
1067          * the revision object from the parser is used, when that is the current one
1068          *
1069          * @param Parser $parser
1070          * @param Title $title
1071          * @return Revision
1072          * @since 1.23
1073          */
1074         private static function getCachedRevisionObject( $parser, $title = null ) {
1075                 if ( is_null( $title ) ) {
1076                         return null;
1077                 }
1078
1079                 // Use the revision from the parser itself, when param is the current page
1080                 // and the revision is the current one
1081                 if ( $title->equals( $parser->getTitle() ) ) {
1082                         $parserRev = $parser->getRevisionObject();
1083                         if ( $parserRev && $parserRev->isCurrent() ) {
1084                                 // force reparse after edit with vary-revision flag
1085                                 $parser->getOutput()->setFlag( 'vary-revision' );
1086                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1087                                 return $parserRev;
1088                         }
1089                 }
1090
1091                 // Normalize name for cache
1092                 $page = $title->getPrefixedDBkey();
1093
1094                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1095                         && !$parser->incrementExpensiveFunctionCount() ) {
1096                         return null;
1097                 }
1098                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1099                 $pageID = $rev ? $rev->getPage() : 0;
1100                 $revID = $rev ? $rev->getId() : 0;
1101
1102                 // Register dependency in templatelinks
1103                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1104
1105                 return $rev;
1106         }
1107
1108         /**
1109          * Get the pageid of a specified page
1110          * @param Parser $parser
1111          * @param string $title Title to get the pageid from
1112          * @return int|null|string
1113          * @since 1.23
1114          */
1115         public static function pageid( $parser, $title = null ) {
1116                 $t = Title::newFromText( $title );
1117                 if ( is_null( $t ) ) {
1118                         return '';
1119                 }
1120                 // Use title from parser to have correct pageid after edit
1121                 if ( $t->equals( $parser->getTitle() ) ) {
1122                         $t = $parser->getTitle();
1123                         return $t->getArticleID();
1124                 }
1125
1126                 // These can't have ids
1127                 if ( !$t->canExist() || $t->isExternal() ) {
1128                         return 0;
1129                 }
1130
1131                 // Check the link cache, maybe something already looked it up.
1132                 $linkCache = LinkCache::singleton();
1133                 $pdbk = $t->getPrefixedDBkey();
1134                 $id = $linkCache->getGoodLinkID( $pdbk );
1135                 if ( $id != 0 ) {
1136                         $parser->mOutput->addLink( $t, $id );
1137                         return $id;
1138                 }
1139                 if ( $linkCache->isBadLink( $pdbk ) ) {
1140                         $parser->mOutput->addLink( $t, 0 );
1141                         return $id;
1142                 }
1143
1144                 // We need to load it from the DB, so mark expensive
1145                 if ( $parser->incrementExpensiveFunctionCount() ) {
1146                         $id = $t->getArticleID();
1147                         $parser->mOutput->addLink( $t, $id );
1148                         return $id;
1149                 }
1150                 return null;
1151         }
1152
1153         /**
1154          * Get the id from the last revision of a specified page.
1155          * @param Parser $parser
1156          * @param string $title Title to get the id from
1157          * @return int|null|string
1158          * @since 1.23
1159          */
1160         public static function revisionid( $parser, $title = null ) {
1161                 $t = Title::newFromText( $title );
1162                 if ( is_null( $t ) ) {
1163                         return '';
1164                 }
1165                 // fetch revision from cache/database and return the value
1166                 $rev = self::getCachedRevisionObject( $parser, $t );
1167                 return $rev ? $rev->getId() : '';
1168         }
1169
1170         /**
1171          * Get the day from the last revision of a specified page.
1172          * @param Parser $parser
1173          * @param string $title Title to get the day from
1174          * @return string
1175          * @since 1.23
1176          */
1177         public static function revisionday( $parser, $title = null ) {
1178                 $t = Title::newFromText( $title );
1179                 if ( is_null( $t ) ) {
1180                         return '';
1181                 }
1182                 // fetch revision from cache/database and return the value
1183                 $rev = self::getCachedRevisionObject( $parser, $t );
1184                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1185         }
1186
1187         /**
1188          * Get the day with leading zeros from the last revision of a specified page.
1189          * @param Parser $parser
1190          * @param string $title Title to get the day from
1191          * @return string
1192          * @since 1.23
1193          */
1194         public static function revisionday2( $parser, $title = null ) {
1195                 $t = Title::newFromText( $title );
1196                 if ( is_null( $t ) ) {
1197                         return '';
1198                 }
1199                 // fetch revision from cache/database and return the value
1200                 $rev = self::getCachedRevisionObject( $parser, $t );
1201                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1202         }
1203
1204         /**
1205          * Get the month with leading zeros from the last revision of a specified page.
1206          * @param Parser $parser
1207          * @param string $title Title to get the month from
1208          * @return string
1209          * @since 1.23
1210          */
1211         public static function revisionmonth( $parser, $title = null ) {
1212                 $t = Title::newFromText( $title );
1213                 if ( is_null( $t ) ) {
1214                         return '';
1215                 }
1216                 // fetch revision from cache/database and return the value
1217                 $rev = self::getCachedRevisionObject( $parser, $t );
1218                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1219         }
1220
1221         /**
1222          * Get the month from the last revision of a specified page.
1223          * @param Parser $parser
1224          * @param string $title Title to get the month from
1225          * @return string
1226          * @since 1.23
1227          */
1228         public static function revisionmonth1( $parser, $title = null ) {
1229                 $t = Title::newFromText( $title );
1230                 if ( is_null( $t ) ) {
1231                         return '';
1232                 }
1233                 // fetch revision from cache/database and return the value
1234                 $rev = self::getCachedRevisionObject( $parser, $t );
1235                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1236         }
1237
1238         /**
1239          * Get the year from the last revision of a specified page.
1240          * @param Parser $parser
1241          * @param string $title Title to get the year from
1242          * @return string
1243          * @since 1.23
1244          */
1245         public static function revisionyear( $parser, $title = null ) {
1246                 $t = Title::newFromText( $title );
1247                 if ( is_null( $t ) ) {
1248                         return '';
1249                 }
1250                 // fetch revision from cache/database and return the value
1251                 $rev = self::getCachedRevisionObject( $parser, $t );
1252                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1253         }
1254
1255         /**
1256          * Get the timestamp from the last revision of a specified page.
1257          * @param Parser $parser
1258          * @param string $title Title to get the timestamp from
1259          * @return string
1260          * @since 1.23
1261          */
1262         public static function revisiontimestamp( $parser, $title = null ) {
1263                 $t = Title::newFromText( $title );
1264                 if ( is_null( $t ) ) {
1265                         return '';
1266                 }
1267                 // fetch revision from cache/database and return the value
1268                 $rev = self::getCachedRevisionObject( $parser, $t );
1269                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1270         }
1271
1272         /**
1273          * Get the user from the last revision of a specified page.
1274          * @param Parser $parser
1275          * @param string $title Title to get the user from
1276          * @return string
1277          * @since 1.23
1278          */
1279         public static function revisionuser( $parser, $title = null ) {
1280                 $t = Title::newFromText( $title );
1281                 if ( is_null( $t ) ) {
1282                         return '';
1283                 }
1284                 // fetch revision from cache/database and return the value
1285                 $rev = self::getCachedRevisionObject( $parser, $t );
1286                 return $rev ? $rev->getUserText() : '';
1287         }
1288
1289         /**
1290          * Returns the sources of any cascading protection acting on a specified page.
1291          * Pages will not return their own title unless they transclude themselves.
1292          * This is an expensive parser function and can't be called too many times per page,
1293          * unless cascading protection sources for the page have already been loaded.
1294          *
1295          * @param Parser $parser
1296          * @param string $title
1297          *
1298          * @return string
1299          * @since 1.23
1300          */
1301         public static function cascadingsources( $parser, $title = '' ) {
1302                 $titleObject = Title::newFromText( $title );
1303                 if ( !( $titleObject instanceof Title ) ) {
1304                         $titleObject = $parser->mTitle;
1305                 }
1306                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1307                         || $parser->incrementExpensiveFunctionCount()
1308                 ) {
1309                         $names = [];
1310                         $sources = $titleObject->getCascadeProtectionSources();
1311                         foreach ( $sources[0] as $sourceTitle ) {
1312                                 $names[] = $sourceTitle->getPrefixedText();
1313                         }
1314                         return implode( $names, '|' );
1315                 }
1316                 return '';
1317         }
1318
1319 }