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 use MediaWiki\MediaWikiServices;
  24
  25 /**
  26  * Various core parser functions, registered in Parser::firstCallInit()
  27  * @ingroup Parser
  28  */
  29 class CoreParserFunctions {
  30         /**
  31          * @param Parser $parser
  32          * @return void
  33          */
  34         public static function register( $parser ) {
  35                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  36
  37                 # Syntax for arguments (see Parser::setFunctionHook):
  38                 #  "name for lookup in localized magic words array",
  39                 #  function callback,
  40                 #  optional Parser::SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}}
  41                 #    instead of {{#int:...}})
  42                 $noHashFunctions = [
  43                         'ns', 'nse', 'urlencode', 'lcfirst', 'ucfirst', 'lc', 'uc',
  44                         'localurl', 'localurle', 'fullurl', 'fullurle', 'canonicalurl',
  45                         'canonicalurle', 'formatnum', 'grammar', 'gender', 'plural', 'bidi',
  46                         'numberofpages', 'numberofusers', 'numberofactiveusers',
  47                         'numberofarticles', 'numberoffiles', 'numberofadmins',
  48                         'numberingroup', 'numberofedits', 'language',
  49                         'padleft', 'padright', 'anchorencode', 'defaultsort', 'filepath',
  50                         'pagesincategory', 'pagesize', 'protectionlevel', 'protectionexpiry',
  51                         'namespacee', 'namespacenumber', 'talkspace', 'talkspacee',
  52                         'subjectspace', 'subjectspacee', 'pagename', 'pagenamee',
  53                         'fullpagename', 'fullpagenamee', 'rootpagename', 'rootpagenamee',
  54                         'basepagename', 'basepagenamee', 'subpagename', 'subpagenamee',
  55                         'talkpagename', 'talkpagenamee', 'subjectpagename',
  56                         'subjectpagenamee', 'pageid', 'revisionid', 'revisionday',
  57                         'revisionday2', 'revisionmonth', 'revisionmonth1', 'revisionyear',
  58                         'revisiontimestamp', 'revisionuser', 'cascadingsources',
  59                 ];
  60                 foreach ( $noHashFunctions as $func ) {
  61                         $parser->setFunctionHook( $func, [ __CLASS__, $func ], Parser::SFH_NO_HASH );
  62                 }
  63
  64                 $parser->setFunctionHook(
  65                         'namespace',
  66                         [ __CLASS__, 'mwnamespace' ],
  67                         Parser::SFH_NO_HASH
  68                 );
  69                 $parser->setFunctionHook( 'int', [ __CLASS__, 'intFunction' ], Parser::SFH_NO_HASH );
  70                 $parser->setFunctionHook( 'special', [ __CLASS__, 'special' ] );
  71                 $parser->setFunctionHook( 'speciale', [ __CLASS__, 'speciale' ] );
  72                 $parser->setFunctionHook( 'tag', [ __CLASS__, 'tagObj' ], Parser::SFH_OBJECT_ARGS );
  73                 $parser->setFunctionHook( 'formatdate', [ __CLASS__, 'formatDate' ] );
  74
  75                 if ( $wgAllowDisplayTitle ) {
  76                         $parser->setFunctionHook(
  77                                 'displaytitle',
  78                                 [ __CLASS__, 'displaytitle' ],
  79                                 Parser::SFH_NO_HASH
  80                         );
  81                 }
  82                 if ( $wgAllowSlowParserFunctions ) {
  83                         $parser->setFunctionHook(
  84                                 'pagesinnamespace',
  85                                 [ __CLASS__, 'pagesinnamespace' ],
  86                                 Parser::SFH_NO_HASH
  87                         );
  88                 }
  89         }
  90
  91         /**
  92          * @param Parser $parser
  93          * @param string $part1
  94          * @return array
  95          */
  96         public static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  97                 if ( strval( $part1 ) !== '' ) {
  98                         $args = array_slice( func_get_args(), 2 );
  99                         $message = wfMessage( $part1, $args )
 100                                 ->inLanguage( $parser->getOptions()->getUserLangObj() );
 101                         if ( !$message->exists() ) {
 102                                 // When message does not exists, the message name is surrounded by angle
 103                                 // and can result in a tag, therefore escape the angles
 104                                 return $message->escaped();
 105                         }
 106                         return [ $message->plain(), 'noparse' => false ];
 107                 } else {
 108                         return [ 'found' => false ];
 109                 }
 110         }
 111
 112         /**
 113          * @param Parser $parser
 114          * @param string $date
 115          * @param string $defaultPref
 116          *
 117          * @return string
 118          */
 119         public static function formatDate( $parser, $date, $defaultPref = null ) {
 120                 $lang = $parser->getFunctionLang();
 121                 $df = DateFormatter::getInstance( $lang );
 122
 123                 $date = trim( $date );
 124
 125                 $pref = $parser->getOptions()->getDateFormat();
 126
 127                 // Specify a different default date format other than the normal default
 128                 // if the user has 'default' for their setting
 129                 if ( $pref == 'default' && $defaultPref ) {
 130                         $pref = $defaultPref;
 131                 }
 132
 133                 $date = $df->reformat( $pref, $date, [ 'match-whole' ] );
 134                 return $date;
 135         }
 136
 137         public static function ns( $parser, $part1 = '' ) {
 138                 global $wgContLang;
 139                 if ( intval( $part1 ) || $part1 == "0" ) {
 140                         $index = intval( $part1 );
 141                 } else {
 142                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 143                 }
 144                 if ( $index !== false ) {
 145                         return $wgContLang->getFormattedNsText( $index );
 146                 } else {
 147                         return [ 'found' => false ];
 148                 }
 149         }
 150
 151         public static function nse( $parser, $part1 = '' ) {
 152                 $ret = self::ns( $parser, $part1 );
 153                 if ( is_string( $ret ) ) {
 154                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 155                 }
 156                 return $ret;
 157         }
 158
 159         /**
 160          * urlencodes a string according to one of three patterns: (T24474)
 161          *
 162          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 163          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 164          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 165          *
 166          * @param Parser $parser
 167          * @param string $s The text to encode.
 168          * @param string $arg (optional): The type of encoding.
 169          * @return string
 170          */
 171         public static function urlencode( $parser, $s = '', $arg = null ) {
 172                 static $magicWords = null;
 173                 if ( is_null( $magicWords ) ) {
 174                         $magicWords = new MagicWordArray( [ 'url_path', 'url_query', 'url_wiki' ] );
 175                 }
 176                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 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->inNamespace( 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->inNamespace( 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                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
 350                 if ( $user ) {
 351                         $gender = $genderCache->getGenderOf( $user, __METHOD__ );
 352                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 353                         $gender = $genderCache->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 354                 }
 355                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 356                 return $ret;
 357         }
 358
 359         /**
 360          * @param Parser $parser
 361          * @param string $text
 362          * @return string
 363          */
 364         public static function plural( $parser, $text = '' ) {
 365                 $forms = array_slice( func_get_args(), 2 );
 366                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 367                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 368                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 369         }
 370
 371         /**
 372          * @param Parser $parser
 373          * @param string $text
 374          * @return string
 375          */
 376         public static function bidi( $parser, $text = '' ) {
 377                 return $parser->getFunctionLang()->embedBidi( $text );
 378         }
 379
 380         /**
 381          * Override the title of the page when viewed, provided we've been given a
 382          * title which will normalise to the canonical title
 383          *
 384          * @param Parser $parser Parent parser
 385          * @param string $text Desired title text
 386          * @param string $uarg
 387          * @return string
 388          */
 389         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 390                 global $wgRestrictDisplayTitle;
 391
 392                 static $magicWords = null;
 393                 if ( is_null( $magicWords ) ) {
 394                         $magicWords = new MagicWordArray( [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
 395                 }
 396                 $arg = $magicWords->matchStartToEnd( $uarg );
 397
 398                 // parse a limited subset of wiki markup (just the single quote items)
 399                 $text = $parser->doQuotes( $text );
 400
 401                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 402                 $text = $parser->killMarkers( $text );
 403
 404                 // list of disallowed tags for DISPLAYTITLE
 405                 // these will be escaped even though they are allowed in normal wiki text
 406                 $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 407                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];
 408
 409                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 410                 if ( $wgRestrictDisplayTitle ) {
 411                         $htmlTagsCallback = function ( &$params ) {
 412                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 413
 414                                 if ( isset( $decoded['style'] ) ) {
 415                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 416                                         // calling it twice doesn't hurt
 417                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 418
 419                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 420                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 421                                         }
 422                                 }
 423
 424                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 425                         };
 426                 } else {
 427                         $htmlTagsCallback = null;
 428                 }
 429
 430                 // only requested titles that normalize to the actual title are allowed through
 431                 // if $wgRestrictDisplayTitle is true (it is by default)
 432                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 433                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 434                         $text,
 435                         $htmlTagsCallback,
 436                         [],
 437                         [],
 438                         $bad
 439                 ) );
 440                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 441
 442                 if ( !$wgRestrictDisplayTitle ||
 443                         ( $title instanceof Title
 444                         && !$title->hasFragment()
 445                         && $title->equals( $parser->mTitle ) )
 446                 ) {
 447                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 448                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 449                                 $parser->mOutput->setDisplayTitle( $text );
 450                         }
 451                         if ( $old !== false && $old !== $text && !$arg ) {
 452                                 $converter = $parser->getConverterLanguage()->getConverter();
 453                                 return '<span class="error">' .
 454                                         wfMessage( 'duplicate-displaytitle',
 455                                                 // Message should be parsed, but these params should only be escaped.
 456                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 457                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 458                                         )->inContentLanguage()->text() .
 459                                         '</span>';
 460                         } else {
 461                                 return '';
 462                         }
 463                 } else {
 464                         $converter = $parser->getConverterLanguage()->getConverter();
 465                         $parser->getOutput()->addWarning(
 466                                 wfMessage( 'restricted-displaytitle',
 467                                         // Message should be parsed, but this param should only be escaped.
 468                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 469                                 )->text()
 470                         );
 471                         $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
 472                 }
 473         }
 474
 475         /**
 476          * Matches the given value against the value of given magic word
 477          *
 478          * @param string $magicword Magic word key
 479          * @param string $value Value to match
 480          * @return bool True on successful match
 481          */
 482         private static function matchAgainstMagicword( $magicword, $value ) {
 483                 $value = trim( strval( $value ) );
 484                 if ( $value === '' ) {
 485                         return false;
 486                 }
 487                 $mwObject = MagicWord::get( $magicword );
 488                 return $mwObject->matchStartToEnd( $value );
 489         }
 490
 491         /**
 492          * Formats a number according to a language.
 493          *
 494          * @param int|float $num
 495          * @param string $raw
 496          * @param Language|StubUserLang $language
 497          * @return string
 498          */
 499         public static function formatRaw( $num, $raw, $language ) {
 500                 if ( self::matchAgainstMagicword( 'rawsuffix', $raw ) ) {
 501                         return $num;
 502                 } else {
 503                         return $language->formatNum( $num );
 504                 }
 505         }
 506
 507         public static function numberofpages( $parser, $raw = null ) {
 508                 return self::formatRaw( SiteStats::pages(), $raw, $parser->getFunctionLang() );
 509         }
 510
 511         public static function numberofusers( $parser, $raw = null ) {
 512                 return self::formatRaw( SiteStats::users(), $raw, $parser->getFunctionLang() );
 513         }
 514         public static function numberofactiveusers( $parser, $raw = null ) {
 515                 return self::formatRaw( SiteStats::activeUsers(), $raw, $parser->getFunctionLang() );
 516         }
 517
 518         public static function numberofarticles( $parser, $raw = null ) {
 519                 return self::formatRaw( SiteStats::articles(), $raw, $parser->getFunctionLang() );
 520         }
 521
 522         public static function numberoffiles( $parser, $raw = null ) {
 523                 return self::formatRaw( SiteStats::images(), $raw, $parser->getFunctionLang() );
 524         }
 525
 526         public static function numberofadmins( $parser, $raw = null ) {
 527                 return self::formatRaw(
 528                         SiteStats::numberingroup( 'sysop' ),
 529                         $raw,
 530                         $parser->getFunctionLang()
 531                 );
 532         }
 533
 534         public static function numberofedits( $parser, $raw = null ) {
 535                 return self::formatRaw( SiteStats::edits(), $raw, $parser->getFunctionLang() );
 536         }
 537
 538         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 539                 return self::formatRaw(
 540                         SiteStats::pagesInNs( intval( $namespace ) ),
 541                         $raw,
 542                         $parser->getFunctionLang()
 543                 );
 544         }
 545         public static function numberingroup( $parser, $name = '', $raw = null ) {
 546                 return self::formatRaw(
 547                         SiteStats::numberingroup( strtolower( $name ) ),
 548                         $raw,
 549                         $parser->getFunctionLang()
 550                 );
 551         }
 552
 553         /**
 554          * Given a title, return the namespace name that would be given by the
 555          * corresponding magic word
 556          * Note: function name changed to "mwnamespace" rather than "namespace"
 557          * to not break PHP 5.3
 558          * @param Parser $parser
 559          * @param string $title
 560          * @return mixed|string
 561          */
 562         public static function mwnamespace( $parser, $title = null ) {
 563                 $t = Title::newFromText( $title );
 564                 if ( is_null( $t ) ) {
 565                         return '';
 566                 }
 567                 return str_replace( '_', ' ', $t->getNsText() );
 568         }
 569         public static function namespacee( $parser, $title = null ) {
 570                 $t = Title::newFromText( $title );
 571                 if ( is_null( $t ) ) {
 572                         return '';
 573                 }
 574                 return wfUrlencode( $t->getNsText() );
 575         }
 576         public static function namespacenumber( $parser, $title = null ) {
 577                 $t = Title::newFromText( $title );
 578                 if ( is_null( $t ) ) {
 579                         return '';
 580                 }
 581                 return $t->getNamespace();
 582         }
 583         public static function talkspace( $parser, $title = null ) {
 584                 $t = Title::newFromText( $title );
 585                 if ( is_null( $t ) || !$t->canTalk() ) {
 586                         return '';
 587                 }
 588                 return str_replace( '_', ' ', $t->getTalkNsText() );
 589         }
 590         public static function talkspacee( $parser, $title = null ) {
 591                 $t = Title::newFromText( $title );
 592                 if ( is_null( $t ) || !$t->canTalk() ) {
 593                         return '';
 594                 }
 595                 return wfUrlencode( $t->getTalkNsText() );
 596         }
 597         public static function subjectspace( $parser, $title = null ) {
 598                 $t = Title::newFromText( $title );
 599                 if ( is_null( $t ) ) {
 600                         return '';
 601                 }
 602                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 603         }
 604         public static function subjectspacee( $parser, $title = null ) {
 605                 $t = Title::newFromText( $title );
 606                 if ( is_null( $t ) ) {
 607                         return '';
 608                 }
 609                 return wfUrlencode( $t->getSubjectNsText() );
 610         }
 611
 612         /**
 613          * Functions to get and normalize pagenames, corresponding to the magic words
 614          * of the same names
 615          * @param Parser $parser
 616          * @param string $title
 617          * @return string
 618          */
 619         public static function pagename( $parser, $title = null ) {
 620                 $t = Title::newFromText( $title );
 621                 if ( is_null( $t ) ) {
 622                         return '';
 623                 }
 624                 return wfEscapeWikiText( $t->getText() );
 625         }
 626         public static function pagenamee( $parser, $title = null ) {
 627                 $t = Title::newFromText( $title );
 628                 if ( is_null( $t ) ) {
 629                         return '';
 630                 }
 631                 return wfEscapeWikiText( $t->getPartialURL() );
 632         }
 633         public static function fullpagename( $parser, $title = null ) {
 634                 $t = Title::newFromText( $title );
 635                 if ( is_null( $t ) || !$t->canTalk() ) {
 636                         return '';
 637                 }
 638                 return wfEscapeWikiText( $t->getPrefixedText() );
 639         }
 640         public static function fullpagenamee( $parser, $title = null ) {
 641                 $t = Title::newFromText( $title );
 642                 if ( is_null( $t ) || !$t->canTalk() ) {
 643                         return '';
 644                 }
 645                 return wfEscapeWikiText( $t->getPrefixedURL() );
 646         }
 647         public static function subpagename( $parser, $title = null ) {
 648                 $t = Title::newFromText( $title );
 649                 if ( is_null( $t ) ) {
 650                         return '';
 651                 }
 652                 return wfEscapeWikiText( $t->getSubpageText() );
 653         }
 654         public static function subpagenamee( $parser, $title = null ) {
 655                 $t = Title::newFromText( $title );
 656                 if ( is_null( $t ) ) {
 657                         return '';
 658                 }
 659                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 660         }
 661         public static function rootpagename( $parser, $title = null ) {
 662                 $t = Title::newFromText( $title );
 663                 if ( is_null( $t ) ) {
 664                         return '';
 665                 }
 666                 return wfEscapeWikiText( $t->getRootText() );
 667         }
 668         public static function rootpagenamee( $parser, $title = null ) {
 669                 $t = Title::newFromText( $title );
 670                 if ( is_null( $t ) ) {
 671                         return '';
 672                 }
 673                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
 674         }
 675         public static function basepagename( $parser, $title = null ) {
 676                 $t = Title::newFromText( $title );
 677                 if ( is_null( $t ) ) {
 678                         return '';
 679                 }
 680                 return wfEscapeWikiText( $t->getBaseText() );
 681         }
 682         public static function basepagenamee( $parser, $title = null ) {
 683                 $t = Title::newFromText( $title );
 684                 if ( is_null( $t ) ) {
 685                         return '';
 686                 }
 687                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 688         }
 689         public static function talkpagename( $parser, $title = null ) {
 690                 $t = Title::newFromText( $title );
 691                 if ( is_null( $t ) || !$t->canTalk() ) {
 692                         return '';
 693                 }
 694                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 695         }
 696         public static function talkpagenamee( $parser, $title = null ) {
 697                 $t = Title::newFromText( $title );
 698                 if ( is_null( $t ) || !$t->canTalk() ) {
 699                         return '';
 700                 }
 701                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 702         }
 703         public static function subjectpagename( $parser, $title = null ) {
 704                 $t = Title::newFromText( $title );
 705                 if ( is_null( $t ) ) {
 706                         return '';
 707                 }
 708                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 709         }
 710         public static function subjectpagenamee( $parser, $title = null ) {
 711                 $t = Title::newFromText( $title );
 712                 if ( is_null( $t ) ) {
 713                         return '';
 714                 }
 715                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 716         }
 717
 718         /**
 719          * Return the number of pages, files or subcats in the given category,
 720          * or 0 if it's nonexistent. This is an expensive parser function and
 721          * can't be called too many times per page.
 722          * @param Parser $parser
 723          * @param string $name
 724          * @param string $arg1
 725          * @param string $arg2
 726          * @return string
 727          */
 728         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 729                 global $wgContLang;
 730                 static $magicWords = null;
 731                 if ( is_null( $magicWords ) ) {
 732                         $magicWords = new MagicWordArray( [
 733                                 'pagesincategory_all',
 734                                 'pagesincategory_pages',
 735                                 'pagesincategory_subcats',
 736                                 'pagesincategory_files'
 737                         ] );
 738                 }
 739                 static $cache = [];
 740
 741                 // split the given option to its variable
 742                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg1 ) ) {
 743                         // {{pagesincategory:|raw[|type]}}
 744                         $raw = $arg1;
 745                         $type = $magicWords->matchStartToEnd( $arg2 );
 746                 } else {
 747                         // {{pagesincategory:[|type[|raw]]}}
 748                         $type = $magicWords->matchStartToEnd( $arg1 );
 749                         $raw = $arg2;
 750                 }
 751                 if ( !$type ) { // backward compatibility
 752                         $type = 'pagesincategory_all';
 753                 }
 754
 755                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 756                 if ( !$title ) { # invalid title
 757                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 758                 }
 759                 $wgContLang->findVariantLink( $name, $title, true );
 760
 761                 // Normalize name for cache
 762                 $name = $title->getDBkey();
 763
 764                 if ( !isset( $cache[$name] ) ) {
 765                         $category = Category::newFromTitle( $title );
 766
 767                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 768                         if ( $parser->incrementExpensiveFunctionCount() ) {
 769                                 // $allCount is the total number of cat members,
 770                                 // not the count of how many members are normal pages.
 771                                 $allCount = (int)$category->getPageCount();
 772                                 $subcatCount = (int)$category->getSubcatCount();
 773                                 $fileCount = (int)$category->getFileCount();
 774                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 775                         }
 776                         $cache[$name]['pagesincategory_all'] = $allCount;
 777                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 778                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 779                         $cache[$name]['pagesincategory_files'] = $fileCount;
 780                 }
 781
 782                 $count = $cache[$name][$type];
 783                 return self::formatRaw( $count, $raw, $parser->getFunctionLang() );
 784         }
 785
 786         /**
 787          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 788          * expensive parser function and can't be called too many times per page.
 789          *
 790          * @param Parser $parser
 791          * @param string $page Name of page to check (Default: empty string)
 792          * @param string $raw Should number be human readable with commas or just number
 793          * @return string
 794          */
 795         public static function pagesize( $parser, $page = '', $raw = null ) {
 796                 $title = Title::newFromText( $page );
 797
 798                 if ( !is_object( $title ) ) {
 799                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 800                 }
 801
 802                 // fetch revision from cache/database and return the value
 803                 $rev = self::getCachedRevisionObject( $parser, $title );
 804                 $length = $rev ? $rev->getSize() : 0;
 805                 if ( $length === null ) {
 806                         // We've had bugs where rev_len was not being recorded for empty pages, see T135414
 807                         $length = 0;
 808                 }
 809                 return self::formatRaw( $length, $raw, $parser->getFunctionLang() );
 810         }
 811
 812         /**
 813          * Returns the requested protection level for the current page. This
 814          * is an expensive parser function and can't be called too many times
 815          * per page, unless the protection levels/expiries for the given title
 816          * have already been retrieved
 817          *
 818          * @param Parser $parser
 819          * @param string $type
 820          * @param string $title
 821          *
 822          * @return string
 823          */
 824         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 825                 $titleObject = Title::newFromText( $title );
 826                 if ( !( $titleObject instanceof Title ) ) {
 827                         $titleObject = $parser->mTitle;
 828                 }
 829                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 830                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 831                         # Title::getRestrictions returns an array, its possible it may have
 832                         # multiple values in the future
 833                         return implode( $restrictions, ',' );
 834                 }
 835                 return '';
 836         }
 837
 838         /**
 839          * Returns the requested protection expiry for the current page. This
 840          * is an expensive parser function and can't be called too many times
 841          * per page, unless the protection levels/expiries for the given title
 842          * have already been retrieved
 843          *
 844          * @param Parser $parser
 845          * @param string $type
 846          * @param string $title
 847          *
 848          * @return string
 849          */
 850         public static function protectionexpiry( $parser, $type = '', $title = '' ) {
 851                 $titleObject = Title::newFromText( $title );
 852                 if ( !( $titleObject instanceof Title ) ) {
 853                         $titleObject = $parser->mTitle;
 854                 }
 855                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 856                         $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
 857                         // getRestrictionExpiry() returns false on invalid type; trying to
 858                         // match protectionlevel() function that returns empty string instead
 859                         if ( $expiry === false ) {
 860                                 $expiry = '';
 861                         }
 862                         return $expiry;
 863                 }
 864                 return '';
 865         }
 866
 867         /**
 868          * Gives language names.
 869          * @param Parser $parser
 870          * @param string $code Language code (of which to get name)
 871          * @param string $inLanguage Language code (in which to get name)
 872          * @return string
 873          */
 874         public static function language( $parser, $code = '', $inLanguage = '' ) {
 875                 $code = strtolower( $code );
 876                 $inLanguage = strtolower( $inLanguage );
 877                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 878                 return $lang !== '' ? $lang : wfBCP47( $code );
 879         }
 880
 881         /**
 882          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 883          * @param Parser $parser
 884          * @param string $string
 885          * @param int $length
 886          * @param string $padding
 887          * @param int $direction
 888          * @return string
 889          */
 890         public static function pad(
 891                 $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
 892         ) {
 893                 $padding = $parser->killMarkers( $padding );
 894                 $lengthOfPadding = mb_strlen( $padding );
 895                 if ( $lengthOfPadding == 0 ) {
 896                         return $string;
 897                 }
 898
 899                 # The remaining length to add counts down to 0 as padding is added
 900                 $length = min( $length, 500 ) - mb_strlen( $string );
 901                 # $finalPadding is just $padding repeated enough times so that
 902                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 903                 $finalPadding = '';
 904                 while ( $length > 0 ) {
 905                         # If $length < $lengthofPadding, truncate $padding so we get the
 906                         # exact length desired.
 907                         $finalPadding .= mb_substr( $padding, 0, $length );
 908                         $length -= $lengthOfPadding;
 909                 }
 910
 911                 if ( $direction == STR_PAD_LEFT ) {
 912                         return $finalPadding . $string;
 913                 } else {
 914                         return $string . $finalPadding;
 915                 }
 916         }
 917
 918         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 919                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 920         }
 921
 922         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 923                 return self::pad( $parser, $string, $length, $padding );
 924         }
 925
 926         /**
 927          * @param Parser $parser
 928          * @param string $text
 929          * @return string
 930          */
 931         public static function anchorencode( $parser, $text ) {
 932                 $text = $parser->killMarkers( $text );
 933                 return (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 934         }
 935
 936         public static function special( $parser, $text ) {
 937                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 938                 if ( $page ) {
 939                         $title = SpecialPage::getTitleFor( $page, $subpage );
 940                         return $title->getPrefixedText();
 941                 } else {
 942                         // unknown special page, just use the given text as its title, if at all possible
 943                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 944                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 945                 }
 946         }
 947
 948         public static function speciale( $parser, $text ) {
 949                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 950         }
 951
 952         /**
 953          * @param Parser $parser
 954          * @param string $text The sortkey to use
 955          * @param string $uarg Either "noreplace" or "noerror" (in en)
 956          *   both suppress errors, and noreplace does nothing if
 957          *   a default sortkey already exists.
 958          * @return string
 959          */
 960         public static function defaultsort( $parser, $text, $uarg = '' ) {
 961                 static $magicWords = null;
 962                 if ( is_null( $magicWords ) ) {
 963                         $magicWords = new MagicWordArray( [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
 964                 }
 965                 $arg = $magicWords->matchStartToEnd( $uarg );
 966
 967                 $text = trim( $text );
 968                 if ( strlen( $text ) == 0 ) {
 969                         return '';
 970                 }
 971                 $old = $parser->getCustomDefaultSort();
 972                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 973                         $parser->setDefaultSort( $text );
 974                 }
 975
 976                 if ( $old === false || $old == $text || $arg ) {
 977                         return '';
 978                 } else {
 979                         $converter = $parser->getConverterLanguage()->getConverter();
 980                         return '<span class="error">' .
 981                                 wfMessage( 'duplicate-defaultsort',
 982                                         // Message should be parsed, but these params should only be escaped.
 983                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 984                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 985                                 )->inContentLanguage()->text() .
 986                                 '</span>';
 987                 }
 988         }
 989
 990         /**
 991          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
 992          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
 993          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
 994          *
 995          * @param Parser $parser
 996          * @param string $name
 997          * @param string $argA
 998          * @param string $argB
 999          * @return array|string
1000          */
1001         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
1002                 $file = wfFindFile( $name );
1003
1004                 if ( $argA == 'nowiki' ) {
1005                         // {{filepath: | option [| size] }}
1006                         $isNowiki = true;
1007                         $parsedWidthParam = $parser->parseWidthParam( $argB );
1008                 } else {
1009                         // {{filepath: [| size [|option]] }}
1010                         $parsedWidthParam = $parser->parseWidthParam( $argA );
1011                         $isNowiki = ( $argB == 'nowiki' );
1012                 }
1013
1014                 if ( $file ) {
1015                         $url = $file->getFullUrl();
1016
1017                         // If a size is requested...
1018                         if ( count( $parsedWidthParam ) ) {
1019                                 $mto = $file->transform( $parsedWidthParam );
1020                                 // ... and we can
1021                                 if ( $mto && !$mto->isError() ) {
1022                                         // ... change the URL to point to a thumbnail.
1023                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
1024                                 }
1025                         }
1026                         if ( $isNowiki ) {
1027                                 return [ $url, 'nowiki' => true ];
1028                         }
1029                         return $url;
1030                 } else {
1031                         return '';
1032                 }
1033         }
1034
1035         /**
1036          * Parser function to extension tag adaptor
1037          * @param Parser $parser
1038          * @param PPFrame $frame
1039          * @param PPNode[] $args
1040          * @return string
1041          */
1042         public static function tagObj( $parser, $frame, $args ) {
1043                 if ( !count( $args ) ) {
1044                         return '';
1045                 }
1046                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
1047
1048                 if ( count( $args ) ) {
1049                         $inner = $frame->expand( array_shift( $args ) );
1050                 } else {
1051                         $inner = null;
1052                 }
1053
1054                 $attributes = [];
1055                 foreach ( $args as $arg ) {
1056                         $bits = $arg->splitArg();
1057                         if ( strval( $bits['index'] ) === '' ) {
1058                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1059                                 $value = trim( $frame->expand( $bits['value'] ) );
1060                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
1061                                         $value = isset( $m[1] ) ? $m[1] : '';
1062                                 }
1063                                 $attributes[$name] = $value;
1064                         }
1065                 }
1066
1067                 $stripList = $parser->getStripList();
1068                 if ( !in_array( $tagName, $stripList ) ) {
1069                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
1070                         $attrText = '';
1071                         foreach ( $attributes as $name => $value ) {
1072                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
1073                         }
1074                         if ( $inner === null ) {
1075                                 return "<$tagName$attrText/>";
1076                         }
1077                         return "<$tagName$attrText>$inner</$tagName>";
1078                 }
1079
1080                 $params = [
1081                         'name' => $tagName,
1082                         'inner' => $inner,
1083                         'attributes' => $attributes,
1084                         'close' => "</$tagName>",
1085                 ];
1086                 return $parser->extensionSubstitution( $params, $frame );
1087         }
1088
1089         /**
1090          * Fetched the current revision of the given title and return this.
1091          * Will increment the expensive function count and
1092          * add a template link to get the value refreshed on changes.
1093          * For a given title, which is equal to the current parser title,
1094          * the revision object from the parser is used, when that is the current one
1095          *
1096          * @param Parser $parser
1097          * @param Title $title
1098          * @return Revision
1099          * @since 1.23
1100          */
1101         private static function getCachedRevisionObject( $parser, $title = null ) {
1102                 if ( is_null( $title ) ) {
1103                         return null;
1104                 }
1105
1106                 // Use the revision from the parser itself, when param is the current page
1107                 // and the revision is the current one
1108                 if ( $title->equals( $parser->getTitle() ) ) {
1109                         $parserRev = $parser->getRevisionObject();
1110                         if ( $parserRev && $parserRev->isCurrent() ) {
1111                                 // force reparse after edit with vary-revision flag
1112                                 $parser->getOutput()->setFlag( 'vary-revision' );
1113                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1114                                 return $parserRev;
1115                         }
1116                 }
1117
1118                 // Normalize name for cache
1119                 $page = $title->getPrefixedDBkey();
1120
1121                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1122                         && !$parser->incrementExpensiveFunctionCount() ) {
1123                         return null;
1124                 }
1125                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1126                 $pageID = $rev ? $rev->getPage() : 0;
1127                 $revID = $rev ? $rev->getId() : 0;
1128
1129                 // Register dependency in templatelinks
1130                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1131
1132                 return $rev;
1133         }
1134
1135         /**
1136          * Get the pageid of a specified page
1137          * @param Parser $parser
1138          * @param string $title Title to get the pageid from
1139          * @return int|null|string
1140          * @since 1.23
1141          */
1142         public static function pageid( $parser, $title = null ) {
1143                 $t = Title::newFromText( $title );
1144                 if ( is_null( $t ) ) {
1145                         return '';
1146                 }
1147                 // Use title from parser to have correct pageid after edit
1148                 if ( $t->equals( $parser->getTitle() ) ) {
1149                         $t = $parser->getTitle();
1150                         return $t->getArticleID();
1151                 }
1152
1153                 // These can't have ids
1154                 if ( !$t->canExist() || $t->isExternal() ) {
1155                         return 0;
1156                 }
1157
1158                 // Check the link cache, maybe something already looked it up.
1159                 $linkCache = LinkCache::singleton();
1160                 $pdbk = $t->getPrefixedDBkey();
1161                 $id = $linkCache->getGoodLinkID( $pdbk );
1162                 if ( $id != 0 ) {
1163                         $parser->mOutput->addLink( $t, $id );
1164                         return $id;
1165                 }
1166                 if ( $linkCache->isBadLink( $pdbk ) ) {
1167                         $parser->mOutput->addLink( $t, 0 );
1168                         return $id;
1169                 }
1170
1171                 // We need to load it from the DB, so mark expensive
1172                 if ( $parser->incrementExpensiveFunctionCount() ) {
1173                         $id = $t->getArticleID();
1174                         $parser->mOutput->addLink( $t, $id );
1175                         return $id;
1176                 }
1177                 return null;
1178         }
1179
1180         /**
1181          * Get the id from the last revision of a specified page.
1182          * @param Parser $parser
1183          * @param string $title Title to get the id from
1184          * @return int|null|string
1185          * @since 1.23
1186          */
1187         public static function revisionid( $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 ? $rev->getId() : '';
1195         }
1196
1197         /**
1198          * Get the day from the last revision of a specified page.
1199          * @param Parser $parser
1200          * @param string $title Title to get the day from
1201          * @return string
1202          * @since 1.23
1203          */
1204         public static function revisionday( $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( 'j' ) : '';
1212         }
1213
1214         /**
1215          * Get the day with leading zeros from the last revision of a specified page.
1216          * @param Parser $parser
1217          * @param string $title Title to get the day from
1218          * @return string
1219          * @since 1.23
1220          */
1221         public static function revisionday2( $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 ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1229         }
1230
1231         /**
1232          * Get the month with leading zeros from the last revision of a specified page.
1233          * @param Parser $parser
1234          * @param string $title Title to get the month from
1235          * @return string
1236          * @since 1.23
1237          */
1238         public static function revisionmonth( $parser, $title = null ) {
1239                 $t = Title::newFromText( $title );
1240                 if ( is_null( $t ) ) {
1241                         return '';
1242                 }
1243                 // fetch revision from cache/database and return the value
1244                 $rev = self::getCachedRevisionObject( $parser, $t );
1245                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1246         }
1247
1248         /**
1249          * Get the month from the last revision of a specified page.
1250          * @param Parser $parser
1251          * @param string $title Title to get the month from
1252          * @return string
1253          * @since 1.23
1254          */
1255         public static function revisionmonth1( $parser, $title = null ) {
1256                 $t = Title::newFromText( $title );
1257                 if ( is_null( $t ) ) {
1258                         return '';
1259                 }
1260                 // fetch revision from cache/database and return the value
1261                 $rev = self::getCachedRevisionObject( $parser, $t );
1262                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1263         }
1264
1265         /**
1266          * Get the year from the last revision of a specified page.
1267          * @param Parser $parser
1268          * @param string $title Title to get the year from
1269          * @return string
1270          * @since 1.23
1271          */
1272         public static function revisionyear( $parser, $title = null ) {
1273                 $t = Title::newFromText( $title );
1274                 if ( is_null( $t ) ) {
1275                         return '';
1276                 }
1277                 // fetch revision from cache/database and return the value
1278                 $rev = self::getCachedRevisionObject( $parser, $t );
1279                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1280         }
1281
1282         /**
1283          * Get the timestamp from the last revision of a specified page.
1284          * @param Parser $parser
1285          * @param string $title Title to get the timestamp from
1286          * @return string
1287          * @since 1.23
1288          */
1289         public static function revisiontimestamp( $parser, $title = null ) {
1290                 $t = Title::newFromText( $title );
1291                 if ( is_null( $t ) ) {
1292                         return '';
1293                 }
1294                 // fetch revision from cache/database and return the value
1295                 $rev = self::getCachedRevisionObject( $parser, $t );
1296                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1297         }
1298
1299         /**
1300          * Get the user from the last revision of a specified page.
1301          * @param Parser $parser
1302          * @param string $title Title to get the user from
1303          * @return string
1304          * @since 1.23
1305          */
1306         public static function revisionuser( $parser, $title = null ) {
1307                 $t = Title::newFromText( $title );
1308                 if ( is_null( $t ) ) {
1309                         return '';
1310                 }
1311                 // fetch revision from cache/database and return the value
1312                 $rev = self::getCachedRevisionObject( $parser, $t );
1313                 return $rev ? $rev->getUserText() : '';
1314         }
1315
1316         /**
1317          * Returns the sources of any cascading protection acting on a specified page.
1318          * Pages will not return their own title unless they transclude themselves.
1319          * This is an expensive parser function and can't be called too many times per page,
1320          * unless cascading protection sources for the page have already been loaded.
1321          *
1322          * @param Parser $parser
1323          * @param string $title
1324          *
1325          * @return string
1326          * @since 1.23
1327          */
1328         public static function cascadingsources( $parser, $title = '' ) {
1329                 $titleObject = Title::newFromText( $title );
1330                 if ( !( $titleObject instanceof Title ) ) {
1331                         $titleObject = $parser->mTitle;
1332                 }
1333                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1334                         || $parser->incrementExpensiveFunctionCount()
1335                 ) {
1336                         $names = [];
1337                         $sources = $titleObject->getCascadeProtectionSources();
1338                         foreach ( $sources[0] as $sourceTitle ) {
1339                                 $names[] = $sourceTitle->getPrefixedText();
1340                         }
1341                         return implode( $names, '|' );
1342                 }
1343                 return '';
1344         }
1345
1346 }