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|null $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|null $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 =
 175                                 $parser->getMagicWordFactory()->newArray( [ 'url_path', 'url_query', 'url_wiki' ] );
 176                 }
 177                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 178                         // Encode as though it's a wiki page, '_' for ' '.
 179                         case 'url_wiki':
 180                                 $func = 'wfUrlencode';
 181                                 $s = str_replace( ' ', '_', $s );
 182                                 break;
 183
 184                         // Encode for an HTTP Path, '%20' for ' '.
 185                         case 'url_path':
 186                                 $func = 'rawurlencode';
 187                                 break;
 188
 189                         // Encode for HTTP query, '+' for ' '.
 190                         case 'url_query':
 191                         default:
 192                                 $func = 'urlencode';
 193                 }
 194                 // See T105242, where the choice to kill markers and various
 195                 // other options were discussed.
 196                 return $func( $parser->killMarkers( $s ) );
 197         }
 198
 199         public static function lcfirst( $parser, $s = '' ) {
 200                 global $wgContLang;
 201                 return $wgContLang->lcfirst( $s );
 202         }
 203
 204         public static function ucfirst( $parser, $s = '' ) {
 205                 global $wgContLang;
 206                 return $wgContLang->ucfirst( $s );
 207         }
 208
 209         /**
 210          * @param Parser $parser
 211          * @param string $s
 212          * @return string
 213          */
 214         public static function lc( $parser, $s = '' ) {
 215                 global $wgContLang;
 216                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'lc' ] );
 217         }
 218
 219         /**
 220          * @param Parser $parser
 221          * @param string $s
 222          * @return string
 223          */
 224         public static function uc( $parser, $s = '' ) {
 225                 global $wgContLang;
 226                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'uc' ] );
 227         }
 228
 229         public static function localurl( $parser, $s = '', $arg = null ) {
 230                 return self::urlFunction( 'getLocalURL', $s, $arg );
 231         }
 232
 233         public static function localurle( $parser, $s = '', $arg = null ) {
 234                 $temp = self::urlFunction( 'getLocalURL', $s, $arg );
 235                 if ( !is_string( $temp ) ) {
 236                         return $temp;
 237                 } else {
 238                         return htmlspecialchars( $temp );
 239                 }
 240         }
 241
 242         public static function fullurl( $parser, $s = '', $arg = null ) {
 243                 return self::urlFunction( 'getFullURL', $s, $arg );
 244         }
 245
 246         public static function fullurle( $parser, $s = '', $arg = null ) {
 247                 $temp = self::urlFunction( 'getFullURL', $s, $arg );
 248                 if ( !is_string( $temp ) ) {
 249                         return $temp;
 250                 } else {
 251                         return htmlspecialchars( $temp );
 252                 }
 253         }
 254
 255         public static function canonicalurl( $parser, $s = '', $arg = null ) {
 256                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 257         }
 258
 259         public static function canonicalurle( $parser, $s = '', $arg = null ) {
 260                 $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
 261                 if ( !is_string( $temp ) ) {
 262                         return $temp;
 263                 } else {
 264                         return htmlspecialchars( $temp );
 265                 }
 266         }
 267
 268         public static function urlFunction( $func, $s = '', $arg = null ) {
 269                 $title = Title::newFromText( $s );
 270                 # Due to order of execution of a lot of bits, the values might be encoded
 271                 # before arriving here; if that's true, then the title can't be created
 272                 # and the variable will fail. If we can't get a decent title from the first
 273                 # attempt, url-decode and try for a second.
 274                 if ( is_null( $title ) ) {
 275                         $title = Title::newFromURL( urldecode( $s ) );
 276                 }
 277                 if ( !is_null( $title ) ) {
 278                         # Convert NS_MEDIA -> NS_FILE
 279                         if ( $title->inNamespace( NS_MEDIA ) ) {
 280                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 281                         }
 282                         if ( !is_null( $arg ) ) {
 283                                 $text = $title->$func( $arg );
 284                         } else {
 285                                 $text = $title->$func();
 286                         }
 287                         return $text;
 288                 } else {
 289                         return [ 'found' => false ];
 290                 }
 291         }
 292
 293         /**
 294          * @param Parser $parser
 295          * @param string $num
 296          * @param string|null $arg
 297          * @return string
 298          */
 299         public static function formatnum( $parser, $num = '', $arg = null ) {
 300                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg ) ) {
 301                         $func = [ $parser->getFunctionLang(), 'parseFormattedNumber' ];
 302                 } elseif (
 303                         self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'nocommafysuffix', $arg )
 304                 ) {
 305                         $func = [ $parser->getFunctionLang(), 'formatNumNoSeparators' ];
 306                 } else {
 307                         $func = [ $parser->getFunctionLang(), 'formatNum' ];
 308                 }
 309                 return $parser->markerSkipCallback( $num, $func );
 310         }
 311
 312         /**
 313          * @param Parser $parser
 314          * @param string $case
 315          * @param string $word
 316          * @return string
 317          */
 318         public static function grammar( $parser, $case = '', $word = '' ) {
 319                 $word = $parser->killMarkers( $word );
 320                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 321         }
 322
 323         /**
 324          * @param Parser $parser
 325          * @param string $username
 326          * @return string
 327          */
 328         public static function gender( $parser, $username ) {
 329                 $forms = array_slice( func_get_args(), 2 );
 330
 331                 // Some shortcuts to avoid loading user data unnecessarily
 332                 if ( count( $forms ) === 0 ) {
 333                         return '';
 334                 } elseif ( count( $forms ) === 1 ) {
 335                         return $forms[0];
 336                 }
 337
 338                 $username = trim( $username );
 339
 340                 // default
 341                 $gender = User::getDefaultOption( 'gender' );
 342
 343                 // allow prefix and normalize (e.g. "&#42;foo" -> "*foo" ).
 344                 $title = Title::newFromText( $username, NS_USER );
 345
 346                 if ( $title && $title->inNamespace( NS_USER ) ) {
 347                         $username = $title->getText();
 348                 }
 349
 350                 // check parameter, or use the ParserOptions if in interface message
 351                 $user = User::newFromName( $username );
 352                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
 353                 if ( $user ) {
 354                         $gender = $genderCache->getGenderOf( $user, __METHOD__ );
 355                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 356                         $gender = $genderCache->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 357                 }
 358                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 359                 return $ret;
 360         }
 361
 362         /**
 363          * @param Parser $parser
 364          * @param string $text
 365          * @return string
 366          */
 367         public static function plural( $parser, $text = '' ) {
 368                 $forms = array_slice( func_get_args(), 2 );
 369                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 370                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 371                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 372         }
 373
 374         /**
 375          * @param Parser $parser
 376          * @param string $text
 377          * @return string
 378          */
 379         public static function bidi( $parser, $text = '' ) {
 380                 return $parser->getFunctionLang()->embedBidi( $text );
 381         }
 382
 383         /**
 384          * Override the title of the page when viewed, provided we've been given a
 385          * title which will normalise to the canonical title
 386          *
 387          * @param Parser $parser Parent parser
 388          * @param string $text Desired title text
 389          * @param string $uarg
 390          * @return string
 391          */
 392         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 393                 global $wgRestrictDisplayTitle;
 394
 395                 static $magicWords = null;
 396                 if ( is_null( $magicWords ) ) {
 397                         $magicWords = $parser->getMagicWordFactory()->newArray(
 398                                 [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
 399                 }
 400                 $arg = $magicWords->matchStartToEnd( $uarg );
 401
 402                 // parse a limited subset of wiki markup (just the single quote items)
 403                 $text = $parser->doQuotes( $text );
 404
 405                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 406                 $text = $parser->killMarkers( $text );
 407
 408                 // list of disallowed tags for DISPLAYTITLE
 409                 // these will be escaped even though they are allowed in normal wiki text
 410                 $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 411                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];
 412
 413                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 414                 if ( $wgRestrictDisplayTitle ) {
 415                         $htmlTagsCallback = function ( &$params ) {
 416                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 417
 418                                 if ( isset( $decoded['style'] ) ) {
 419                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 420                                         // calling it twice doesn't hurt
 421                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 422
 423                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 424                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 425                                         }
 426                                 }
 427
 428                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 429                         };
 430                 } else {
 431                         $htmlTagsCallback = null;
 432                 }
 433
 434                 // only requested titles that normalize to the actual title are allowed through
 435                 // if $wgRestrictDisplayTitle is true (it is by default)
 436                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 437                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 438                         $text,
 439                         $htmlTagsCallback,
 440                         [],
 441                         [],
 442                         $bad
 443                 ) );
 444                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 445
 446                 if ( !$wgRestrictDisplayTitle ||
 447                         ( $title instanceof Title
 448                         && !$title->hasFragment()
 449                         && $title->equals( $parser->mTitle ) )
 450                 ) {
 451                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 452                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 453                                 $parser->mOutput->setDisplayTitle( $text );
 454                         }
 455                         if ( $old !== false && $old !== $text && !$arg ) {
 456                                 $converter = $parser->getTargetLanguage()->getConverter();
 457                                 return '<span class="error">' .
 458                                         wfMessage( 'duplicate-displaytitle',
 459                                                 // Message should be parsed, but these params should only be escaped.
 460                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 461                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 462                                         )->inContentLanguage()->text() .
 463                                         '</span>';
 464                         } else {
 465                                 return '';
 466                         }
 467                 } else {
 468                         $converter = $parser->getTargetLanguage()->getConverter();
 469                         $parser->getOutput()->addWarning(
 470                                 wfMessage( 'restricted-displaytitle',
 471                                         // Message should be parsed, but this param should only be escaped.
 472                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 473                                 )->text()
 474                         );
 475                         $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
 476                 }
 477         }
 478
 479         /**
 480          * Matches the given value against the value of given magic word
 481          *
 482          * @param MagicWordFactory $magicWordFactory A factory to get the word from, e.g., from
 483          *   $parser->getMagicWordFactory()
 484          * @param string $magicword Magic word key
 485          * @param string $value Value to match
 486          * @return bool True on successful match
 487          */
 488         private static function matchAgainstMagicword(
 489                 MagicWordFactory $magicWordFactory, $magicword, $value
 490         ) {
 491                 $value = trim( strval( $value ) );
 492                 if ( $value === '' ) {
 493                         return false;
 494                 }
 495                 $mwObject = $magicWordFactory->get( $magicword );
 496                 return $mwObject->matchStartToEnd( $value );
 497         }
 498
 499         /**
 500          * Formats a number according to a language.
 501          *
 502          * @param int|float $num
 503          * @param string $raw
 504          * @param Language|StubUserLang $language
 505          * @param MagicWordFactory|null $magicWordFactory To evaluate $raw
 506          * @return string
 507          */
 508         public static function formatRaw(
 509                 $num, $raw, $language, MagicWordFactory $magicWordFactory = null
 510         ) {
 511                 if ( $raw !== null && !$magicWordFactory ) {
 512                         $magicWordFactory = MediaWikiServices::getInstance()->getMagicWordFactory();
 513                 }
 514                 if (
 515                         $raw !== null && self::matchAgainstMagicword( $magicWordFactory, 'rawsuffix', $raw )
 516                 ) {
 517                         return $num;
 518                 } else {
 519                         return $language->formatNum( $num );
 520                 }
 521         }
 522
 523         public static function numberofpages( $parser, $raw = null ) {
 524                 return self::formatRaw( SiteStats::pages(), $raw, $parser->getFunctionLang() );
 525         }
 526
 527         public static function numberofusers( $parser, $raw = null ) {
 528                 return self::formatRaw( SiteStats::users(), $raw, $parser->getFunctionLang() );
 529         }
 530         public static function numberofactiveusers( $parser, $raw = null ) {
 531                 return self::formatRaw( SiteStats::activeUsers(), $raw, $parser->getFunctionLang() );
 532         }
 533
 534         public static function numberofarticles( $parser, $raw = null ) {
 535                 return self::formatRaw( SiteStats::articles(), $raw, $parser->getFunctionLang() );
 536         }
 537
 538         public static function numberoffiles( $parser, $raw = null ) {
 539                 return self::formatRaw( SiteStats::images(), $raw, $parser->getFunctionLang() );
 540         }
 541
 542         public static function numberofadmins( $parser, $raw = null ) {
 543                 return self::formatRaw(
 544                         SiteStats::numberingroup( 'sysop' ),
 545                         $raw,
 546                         $parser->getFunctionLang()
 547                 );
 548         }
 549
 550         public static function numberofedits( $parser, $raw = null ) {
 551                 return self::formatRaw( SiteStats::edits(), $raw, $parser->getFunctionLang() );
 552         }
 553
 554         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 555                 return self::formatRaw(
 556                         SiteStats::pagesInNs( intval( $namespace ) ),
 557                         $raw,
 558                         $parser->getFunctionLang()
 559                 );
 560         }
 561         public static function numberingroup( $parser, $name = '', $raw = null ) {
 562                 return self::formatRaw(
 563                         SiteStats::numberingroup( strtolower( $name ) ),
 564                         $raw,
 565                         $parser->getFunctionLang()
 566                 );
 567         }
 568
 569         /**
 570          * Given a title, return the namespace name that would be given by the
 571          * corresponding magic word
 572          * Note: function name changed to "mwnamespace" rather than "namespace"
 573          * to not break PHP 5.3
 574          * @param Parser $parser
 575          * @param string|null $title
 576          * @return mixed|string
 577          */
 578         public static function mwnamespace( $parser, $title = null ) {
 579                 $t = Title::newFromText( $title );
 580                 if ( is_null( $t ) ) {
 581                         return '';
 582                 }
 583                 return str_replace( '_', ' ', $t->getNsText() );
 584         }
 585         public static function namespacee( $parser, $title = null ) {
 586                 $t = Title::newFromText( $title );
 587                 if ( is_null( $t ) ) {
 588                         return '';
 589                 }
 590                 return wfUrlencode( $t->getNsText() );
 591         }
 592         public static function namespacenumber( $parser, $title = null ) {
 593                 $t = Title::newFromText( $title );
 594                 if ( is_null( $t ) ) {
 595                         return '';
 596                 }
 597                 return $t->getNamespace();
 598         }
 599         public static function talkspace( $parser, $title = null ) {
 600                 $t = Title::newFromText( $title );
 601                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 602                         return '';
 603                 }
 604                 return str_replace( '_', ' ', $t->getTalkNsText() );
 605         }
 606         public static function talkspacee( $parser, $title = null ) {
 607                 $t = Title::newFromText( $title );
 608                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 609                         return '';
 610                 }
 611                 return wfUrlencode( $t->getTalkNsText() );
 612         }
 613         public static function subjectspace( $parser, $title = null ) {
 614                 $t = Title::newFromText( $title );
 615                 if ( is_null( $t ) ) {
 616                         return '';
 617                 }
 618                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 619         }
 620         public static function subjectspacee( $parser, $title = null ) {
 621                 $t = Title::newFromText( $title );
 622                 if ( is_null( $t ) ) {
 623                         return '';
 624                 }
 625                 return wfUrlencode( $t->getSubjectNsText() );
 626         }
 627
 628         /**
 629          * Functions to get and normalize pagenames, corresponding to the magic words
 630          * of the same names
 631          * @param Parser $parser
 632          * @param string|null $title
 633          * @return string
 634          */
 635         public static function pagename( $parser, $title = null ) {
 636                 $t = Title::newFromText( $title );
 637                 if ( is_null( $t ) ) {
 638                         return '';
 639                 }
 640                 return wfEscapeWikiText( $t->getText() );
 641         }
 642         public static function pagenamee( $parser, $title = null ) {
 643                 $t = Title::newFromText( $title );
 644                 if ( is_null( $t ) ) {
 645                         return '';
 646                 }
 647                 return wfEscapeWikiText( $t->getPartialURL() );
 648         }
 649         public static function fullpagename( $parser, $title = null ) {
 650                 $t = Title::newFromText( $title );
 651                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 652                         return '';
 653                 }
 654                 return wfEscapeWikiText( $t->getPrefixedText() );
 655         }
 656         public static function fullpagenamee( $parser, $title = null ) {
 657                 $t = Title::newFromText( $title );
 658                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 659                         return '';
 660                 }
 661                 return wfEscapeWikiText( $t->getPrefixedURL() );
 662         }
 663         public static function subpagename( $parser, $title = null ) {
 664                 $t = Title::newFromText( $title );
 665                 if ( is_null( $t ) ) {
 666                         return '';
 667                 }
 668                 return wfEscapeWikiText( $t->getSubpageText() );
 669         }
 670         public static function subpagenamee( $parser, $title = null ) {
 671                 $t = Title::newFromText( $title );
 672                 if ( is_null( $t ) ) {
 673                         return '';
 674                 }
 675                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 676         }
 677         public static function rootpagename( $parser, $title = null ) {
 678                 $t = Title::newFromText( $title );
 679                 if ( is_null( $t ) ) {
 680                         return '';
 681                 }
 682                 return wfEscapeWikiText( $t->getRootText() );
 683         }
 684         public static function rootpagenamee( $parser, $title = null ) {
 685                 $t = Title::newFromText( $title );
 686                 if ( is_null( $t ) ) {
 687                         return '';
 688                 }
 689                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
 690         }
 691         public static function basepagename( $parser, $title = null ) {
 692                 $t = Title::newFromText( $title );
 693                 if ( is_null( $t ) ) {
 694                         return '';
 695                 }
 696                 return wfEscapeWikiText( $t->getBaseText() );
 697         }
 698         public static function basepagenamee( $parser, $title = null ) {
 699                 $t = Title::newFromText( $title );
 700                 if ( is_null( $t ) ) {
 701                         return '';
 702                 }
 703                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 704         }
 705         public static function talkpagename( $parser, $title = null ) {
 706                 $t = Title::newFromText( $title );
 707                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 708                         return '';
 709                 }
 710                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 711         }
 712         public static function talkpagenamee( $parser, $title = null ) {
 713                 $t = Title::newFromText( $title );
 714                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 715                         return '';
 716                 }
 717                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 718         }
 719         public static function subjectpagename( $parser, $title = null ) {
 720                 $t = Title::newFromText( $title );
 721                 if ( is_null( $t ) ) {
 722                         return '';
 723                 }
 724                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 725         }
 726         public static function subjectpagenamee( $parser, $title = null ) {
 727                 $t = Title::newFromText( $title );
 728                 if ( is_null( $t ) ) {
 729                         return '';
 730                 }
 731                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 732         }
 733
 734         /**
 735          * Return the number of pages, files or subcats in the given category,
 736          * or 0 if it's nonexistent. This is an expensive parser function and
 737          * can't be called too many times per page.
 738          * @param Parser $parser
 739          * @param string $name
 740          * @param string|null $arg1
 741          * @param string|null $arg2
 742          * @return string
 743          */
 744         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 745                 global $wgContLang;
 746                 static $magicWords = null;
 747                 if ( is_null( $magicWords ) ) {
 748                         $magicWords = $parser->getMagicWordFactory()->newArray( [
 749                                 'pagesincategory_all',
 750                                 'pagesincategory_pages',
 751                                 'pagesincategory_subcats',
 752                                 'pagesincategory_files'
 753                         ] );
 754                 }
 755                 static $cache = [];
 756
 757                 // split the given option to its variable
 758                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg1 ) ) {
 759                         // {{pagesincategory:|raw[|type]}}
 760                         $raw = $arg1;
 761                         $type = $magicWords->matchStartToEnd( $arg2 );
 762                 } else {
 763                         // {{pagesincategory:[|type[|raw]]}}
 764                         $type = $magicWords->matchStartToEnd( $arg1 );
 765                         $raw = $arg2;
 766                 }
 767                 if ( !$type ) { // backward compatibility
 768                         $type = 'pagesincategory_all';
 769                 }
 770
 771                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 772                 if ( !$title ) { # invalid title
 773                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 774                 }
 775                 $wgContLang->findVariantLink( $name, $title, true );
 776
 777                 // Normalize name for cache
 778                 $name = $title->getDBkey();
 779
 780                 if ( !isset( $cache[$name] ) ) {
 781                         $category = Category::newFromTitle( $title );
 782
 783                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 784                         if ( $parser->incrementExpensiveFunctionCount() ) {
 785                                 // $allCount is the total number of cat members,
 786                                 // not the count of how many members are normal pages.
 787                                 $allCount = (int)$category->getPageCount();
 788                                 $subcatCount = (int)$category->getSubcatCount();
 789                                 $fileCount = (int)$category->getFileCount();
 790                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 791                         }
 792                         $cache[$name]['pagesincategory_all'] = $allCount;
 793                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 794                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 795                         $cache[$name]['pagesincategory_files'] = $fileCount;
 796                 }
 797
 798                 $count = $cache[$name][$type];
 799                 return self::formatRaw( $count, $raw, $parser->getFunctionLang() );
 800         }
 801
 802         /**
 803          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 804          * expensive parser function and can't be called too many times per page.
 805          *
 806          * @param Parser $parser
 807          * @param string $page Name of page to check (Default: empty string)
 808          * @param string|null $raw Should number be human readable with commas or just number
 809          * @return string
 810          */
 811         public static function pagesize( $parser, $page = '', $raw = null ) {
 812                 $title = Title::newFromText( $page );
 813
 814                 if ( !is_object( $title ) ) {
 815                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 816                 }
 817
 818                 // fetch revision from cache/database and return the value
 819                 $rev = self::getCachedRevisionObject( $parser, $title );
 820                 $length = $rev ? $rev->getSize() : 0;
 821                 if ( $length === null ) {
 822                         // We've had bugs where rev_len was not being recorded for empty pages, see T135414
 823                         $length = 0;
 824                 }
 825                 return self::formatRaw( $length, $raw, $parser->getFunctionLang() );
 826         }
 827
 828         /**
 829          * Returns the requested protection level for the current page. This
 830          * is an expensive parser function and can't be called too many times
 831          * per page, unless the protection levels/expiries for the given title
 832          * have already been retrieved
 833          *
 834          * @param Parser $parser
 835          * @param string $type
 836          * @param string $title
 837          *
 838          * @return string
 839          */
 840         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 841                 $titleObject = Title::newFromText( $title );
 842                 if ( !( $titleObject instanceof Title ) ) {
 843                         $titleObject = $parser->mTitle;
 844                 }
 845                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 846                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 847                         # Title::getRestrictions returns an array, its possible it may have
 848                         # multiple values in the future
 849                         return implode( ',', $restrictions );
 850                 }
 851                 return '';
 852         }
 853
 854         /**
 855          * Returns the requested protection expiry for the current page. This
 856          * is an expensive parser function and can't be called too many times
 857          * per page, unless the protection levels/expiries for the given title
 858          * have already been retrieved
 859          *
 860          * @param Parser $parser
 861          * @param string $type
 862          * @param string $title
 863          *
 864          * @return string
 865          */
 866         public static function protectionexpiry( $parser, $type = '', $title = '' ) {
 867                 $titleObject = Title::newFromText( $title );
 868                 if ( !( $titleObject instanceof Title ) ) {
 869                         $titleObject = $parser->mTitle;
 870                 }
 871                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 872                         $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
 873                         // getRestrictionExpiry() returns false on invalid type; trying to
 874                         // match protectionlevel() function that returns empty string instead
 875                         if ( $expiry === false ) {
 876                                 $expiry = '';
 877                         }
 878                         return $expiry;
 879                 }
 880                 return '';
 881         }
 882
 883         /**
 884          * Gives language names.
 885          * @param Parser $parser
 886          * @param string $code Language code (of which to get name)
 887          * @param string $inLanguage Language code (in which to get name)
 888          * @return string
 889          */
 890         public static function language( $parser, $code = '', $inLanguage = '' ) {
 891                 $code = strtolower( $code );
 892                 $inLanguage = strtolower( $inLanguage );
 893                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 894                 return $lang !== '' ? $lang : LanguageCode::bcp47( $code );
 895         }
 896
 897         /**
 898          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 899          * @param Parser $parser
 900          * @param string $string
 901          * @param string $length
 902          * @param string $padding
 903          * @param int $direction
 904          * @return string
 905          */
 906         public static function pad(
 907                 $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
 908         ) {
 909                 $padding = $parser->killMarkers( $padding );
 910                 $lengthOfPadding = mb_strlen( $padding );
 911                 if ( $lengthOfPadding == 0 ) {
 912                         return $string;
 913                 }
 914
 915                 # The remaining length to add counts down to 0 as padding is added
 916                 $length = min( (int)$length, 500 ) - mb_strlen( $string );
 917                 if ( $length <= 0 ) {
 918                         // Nothing to add
 919                         return $string;
 920                 }
 921
 922                 # $finalPadding is just $padding repeated enough times so that
 923                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 924                 $finalPadding = '';
 925                 while ( $length > 0 ) {
 926                         # If $length < $lengthofPadding, truncate $padding so we get the
 927                         # exact length desired.
 928                         $finalPadding .= mb_substr( $padding, 0, $length );
 929                         $length -= $lengthOfPadding;
 930                 }
 931
 932                 if ( $direction == STR_PAD_LEFT ) {
 933                         return $finalPadding . $string;
 934                 } else {
 935                         return $string . $finalPadding;
 936                 }
 937         }
 938
 939         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 940                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 941         }
 942
 943         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 944                 return self::pad( $parser, $string, $length, $padding );
 945         }
 946
 947         /**
 948          * @param Parser $parser
 949          * @param string $text
 950          * @return string
 951          */
 952         public static function anchorencode( $parser, $text ) {
 953                 $text = $parser->killMarkers( $text );
 954                 $section = (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 955                 return Sanitizer::safeEncodeAttribute( $section );
 956         }
 957
 958         public static function special( $parser, $text ) {
 959                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 960                 if ( $page ) {
 961                         $title = SpecialPage::getTitleFor( $page, $subpage );
 962                         return $title->getPrefixedText();
 963                 } else {
 964                         // unknown special page, just use the given text as its title, if at all possible
 965                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 966                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 967                 }
 968         }
 969
 970         public static function speciale( $parser, $text ) {
 971                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 972         }
 973
 974         /**
 975          * @param Parser $parser
 976          * @param string $text The sortkey to use
 977          * @param string $uarg Either "noreplace" or "noerror" (in en)
 978          *   both suppress errors, and noreplace does nothing if
 979          *   a default sortkey already exists.
 980          * @return string
 981          */
 982         public static function defaultsort( $parser, $text, $uarg = '' ) {
 983                 static $magicWords = null;
 984                 if ( is_null( $magicWords ) ) {
 985                         $magicWords = $parser->getMagicWordFactory()->newArray(
 986                                 [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
 987                 }
 988                 $arg = $magicWords->matchStartToEnd( $uarg );
 989
 990                 $text = trim( $text );
 991                 if ( strlen( $text ) == 0 ) {
 992                         return '';
 993                 }
 994                 $old = $parser->getCustomDefaultSort();
 995                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 996                         $parser->setDefaultSort( $text );
 997                 }
 998
 999                 if ( $old === false || $old == $text || $arg ) {
1000                         return '';
1001                 } else {
1002                         $converter = $parser->getTargetLanguage()->getConverter();
1003                         return '<span class="error">' .
1004                                 wfMessage( 'duplicate-defaultsort',
1005                                         // Message should be parsed, but these params should only be escaped.
1006                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
1007                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
1008                                 )->inContentLanguage()->text() .
1009                                 '</span>';
1010                 }
1011         }
1012
1013         /**
1014          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
1015          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
1016          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
1017          *
1018          * @param Parser $parser
1019          * @param string $name
1020          * @param string $argA
1021          * @param string $argB
1022          * @return array|string
1023          */
1024         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
1025                 $file = wfFindFile( $name );
1026
1027                 if ( $argA == 'nowiki' ) {
1028                         // {{filepath: | option [| size] }}
1029                         $isNowiki = true;
1030                         $parsedWidthParam = Parser::parseWidthParam( $argB );
1031                 } else {
1032                         // {{filepath: [| size [|option]] }}
1033                         $parsedWidthParam = Parser::parseWidthParam( $argA );
1034                         $isNowiki = ( $argB == 'nowiki' );
1035                 }
1036
1037                 if ( $file ) {
1038                         $url = $file->getFullUrl();
1039
1040                         // If a size is requested...
1041                         if ( count( $parsedWidthParam ) ) {
1042                                 $mto = $file->transform( $parsedWidthParam );
1043                                 // ... and we can
1044                                 if ( $mto && !$mto->isError() ) {
1045                                         // ... change the URL to point to a thumbnail.
1046                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
1047                                 }
1048                         }
1049                         if ( $isNowiki ) {
1050                                 return [ $url, 'nowiki' => true ];
1051                         }
1052                         return $url;
1053                 } else {
1054                         return '';
1055                 }
1056         }
1057
1058         /**
1059          * Parser function to extension tag adaptor
1060          * @param Parser $parser
1061          * @param PPFrame $frame
1062          * @param PPNode[] $args
1063          * @return string
1064          */
1065         public static function tagObj( $parser, $frame, $args ) {
1066                 if ( !count( $args ) ) {
1067                         return '';
1068                 }
1069                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
1070
1071                 if ( count( $args ) ) {
1072                         $inner = $frame->expand( array_shift( $args ) );
1073                 } else {
1074                         $inner = null;
1075                 }
1076
1077                 $attributes = [];
1078                 foreach ( $args as $arg ) {
1079                         $bits = $arg->splitArg();
1080                         if ( strval( $bits['index'] ) === '' ) {
1081                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1082                                 $value = trim( $frame->expand( $bits['value'] ) );
1083                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
1084                                         $value = $m[1] ?? '';
1085                                 }
1086                                 $attributes[$name] = $value;
1087                         }
1088                 }
1089
1090                 $stripList = $parser->getStripList();
1091                 if ( !in_array( $tagName, $stripList ) ) {
1092                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
1093                         $attrText = '';
1094                         foreach ( $attributes as $name => $value ) {
1095                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
1096                         }
1097                         if ( $inner === null ) {
1098                                 return "<$tagName$attrText/>";
1099                         }
1100                         return "<$tagName$attrText>$inner</$tagName>";
1101                 }
1102
1103                 $params = [
1104                         'name' => $tagName,
1105                         'inner' => $inner,
1106                         'attributes' => $attributes,
1107                         'close' => "</$tagName>",
1108                 ];
1109                 return $parser->extensionSubstitution( $params, $frame );
1110         }
1111
1112         /**
1113          * Fetched the current revision of the given title and return this.
1114          * Will increment the expensive function count and
1115          * add a template link to get the value refreshed on changes.
1116          * For a given title, which is equal to the current parser title,
1117          * the revision object from the parser is used, when that is the current one
1118          *
1119          * @param Parser $parser
1120          * @param Title $title
1121          * @return Revision
1122          * @since 1.23
1123          */
1124         private static function getCachedRevisionObject( $parser, $title = null ) {
1125                 if ( is_null( $title ) ) {
1126                         return null;
1127                 }
1128
1129                 // Use the revision from the parser itself, when param is the current page
1130                 // and the revision is the current one
1131                 if ( $title->equals( $parser->getTitle() ) ) {
1132                         $parserRev = $parser->getRevisionObject();
1133                         if ( $parserRev && $parserRev->isCurrent() ) {
1134                                 // force reparse after edit with vary-revision flag
1135                                 $parser->getOutput()->setFlag( 'vary-revision' );
1136                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1137                                 return $parserRev;
1138                         }
1139                 }
1140
1141                 // Normalize name for cache
1142                 $page = $title->getPrefixedDBkey();
1143
1144                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1145                         && !$parser->incrementExpensiveFunctionCount() ) {
1146                         return null;
1147                 }
1148                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1149                 $pageID = $rev ? $rev->getPage() : 0;
1150                 $revID = $rev ? $rev->getId() : 0;
1151
1152                 // Register dependency in templatelinks
1153                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1154
1155                 return $rev;
1156         }
1157
1158         /**
1159          * Get the pageid of a specified page
1160          * @param Parser $parser
1161          * @param string|null $title Title to get the pageid from
1162          * @return int|null|string
1163          * @since 1.23
1164          */
1165         public static function pageid( $parser, $title = null ) {
1166                 $t = Title::newFromText( $title );
1167                 if ( is_null( $t ) ) {
1168                         return '';
1169                 }
1170                 // Use title from parser to have correct pageid after edit
1171                 if ( $t->equals( $parser->getTitle() ) ) {
1172                         $t = $parser->getTitle();
1173                         return $t->getArticleID();
1174                 }
1175
1176                 // These can't have ids
1177                 if ( !$t->canExist() || $t->isExternal() ) {
1178                         return 0;
1179                 }
1180
1181                 // Check the link cache, maybe something already looked it up.
1182                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1183                 $pdbk = $t->getPrefixedDBkey();
1184                 $id = $linkCache->getGoodLinkID( $pdbk );
1185                 if ( $id != 0 ) {
1186                         $parser->mOutput->addLink( $t, $id );
1187                         return $id;
1188                 }
1189                 if ( $linkCache->isBadLink( $pdbk ) ) {
1190                         $parser->mOutput->addLink( $t, 0 );
1191                         return $id;
1192                 }
1193
1194                 // We need to load it from the DB, so mark expensive
1195                 if ( $parser->incrementExpensiveFunctionCount() ) {
1196                         $id = $t->getArticleID();
1197                         $parser->mOutput->addLink( $t, $id );
1198                         return $id;
1199                 }
1200                 return null;
1201         }
1202
1203         /**
1204          * Get the id from the last revision of a specified page.
1205          * @param Parser $parser
1206          * @param string|null $title Title to get the id from
1207          * @return int|null|string
1208          * @since 1.23
1209          */
1210         public static function revisionid( $parser, $title = null ) {
1211                 $t = Title::newFromText( $title );
1212                 if ( is_null( $t ) ) {
1213                         return '';
1214                 }
1215                 // fetch revision from cache/database and return the value
1216                 $rev = self::getCachedRevisionObject( $parser, $t );
1217                 return $rev ? $rev->getId() : '';
1218         }
1219
1220         /**
1221          * Get the day from the last revision of a specified page.
1222          * @param Parser $parser
1223          * @param string|null $title Title to get the day from
1224          * @return string
1225          * @since 1.23
1226          */
1227         public static function revisionday( $parser, $title = null ) {
1228                 $t = Title::newFromText( $title );
1229                 if ( is_null( $t ) ) {
1230                         return '';
1231                 }
1232                 // fetch revision from cache/database and return the value
1233                 $rev = self::getCachedRevisionObject( $parser, $t );
1234                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1235         }
1236
1237         /**
1238          * Get the day with leading zeros from the last revision of a specified page.
1239          * @param Parser $parser
1240          * @param string|null $title Title to get the day from
1241          * @return string
1242          * @since 1.23
1243          */
1244         public static function revisionday2( $parser, $title = null ) {
1245                 $t = Title::newFromText( $title );
1246                 if ( is_null( $t ) ) {
1247                         return '';
1248                 }
1249                 // fetch revision from cache/database and return the value
1250                 $rev = self::getCachedRevisionObject( $parser, $t );
1251                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1252         }
1253
1254         /**
1255          * Get the month with leading zeros from the last revision of a specified page.
1256          * @param Parser $parser
1257          * @param string|null $title Title to get the month from
1258          * @return string
1259          * @since 1.23
1260          */
1261         public static function revisionmonth( $parser, $title = null ) {
1262                 $t = Title::newFromText( $title );
1263                 if ( is_null( $t ) ) {
1264                         return '';
1265                 }
1266                 // fetch revision from cache/database and return the value
1267                 $rev = self::getCachedRevisionObject( $parser, $t );
1268                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1269         }
1270
1271         /**
1272          * Get the month from the last revision of a specified page.
1273          * @param Parser $parser
1274          * @param string|null $title Title to get the month from
1275          * @return string
1276          * @since 1.23
1277          */
1278         public static function revisionmonth1( $parser, $title = null ) {
1279                 $t = Title::newFromText( $title );
1280                 if ( is_null( $t ) ) {
1281                         return '';
1282                 }
1283                 // fetch revision from cache/database and return the value
1284                 $rev = self::getCachedRevisionObject( $parser, $t );
1285                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1286         }
1287
1288         /**
1289          * Get the year from the last revision of a specified page.
1290          * @param Parser $parser
1291          * @param string|null $title Title to get the year from
1292          * @return string
1293          * @since 1.23
1294          */
1295         public static function revisionyear( $parser, $title = null ) {
1296                 $t = Title::newFromText( $title );
1297                 if ( is_null( $t ) ) {
1298                         return '';
1299                 }
1300                 // fetch revision from cache/database and return the value
1301                 $rev = self::getCachedRevisionObject( $parser, $t );
1302                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1303         }
1304
1305         /**
1306          * Get the timestamp from the last revision of a specified page.
1307          * @param Parser $parser
1308          * @param string|null $title Title to get the timestamp from
1309          * @return string
1310          * @since 1.23
1311          */
1312         public static function revisiontimestamp( $parser, $title = null ) {
1313                 $t = Title::newFromText( $title );
1314                 if ( is_null( $t ) ) {
1315                         return '';
1316                 }
1317                 // fetch revision from cache/database and return the value
1318                 $rev = self::getCachedRevisionObject( $parser, $t );
1319                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1320         }
1321
1322         /**
1323          * Get the user from the last revision of a specified page.
1324          * @param Parser $parser
1325          * @param string|null $title Title to get the user from
1326          * @return string
1327          * @since 1.23
1328          */
1329         public static function revisionuser( $parser, $title = null ) {
1330                 $t = Title::newFromText( $title );
1331                 if ( is_null( $t ) ) {
1332                         return '';
1333                 }
1334                 // fetch revision from cache/database and return the value
1335                 $rev = self::getCachedRevisionObject( $parser, $t );
1336                 return $rev ? $rev->getUserText() : '';
1337         }
1338
1339         /**
1340          * Returns the sources of any cascading protection acting on a specified page.
1341          * Pages will not return their own title unless they transclude themselves.
1342          * This is an expensive parser function and can't be called too many times per page,
1343          * unless cascading protection sources for the page have already been loaded.
1344          *
1345          * @param Parser $parser
1346          * @param string $title
1347          *
1348          * @return string
1349          * @since 1.23
1350          */
1351         public static function cascadingsources( $parser, $title = '' ) {
1352                 $titleObject = Title::newFromText( $title );
1353                 if ( !( $titleObject instanceof Title ) ) {
1354                         $titleObject = $parser->mTitle;
1355                 }
1356                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1357                         || $parser->incrementExpensiveFunctionCount()
1358                 ) {
1359                         $names = [];
1360                         $sources = $titleObject->getCascadeProtectionSources();
1361                         foreach ( $sources[0] as $sourceTitle ) {
1362                                 $names[] = $sourceTitle->getPrefixedText();
1363                         }
1364                         return implode( '|', $names );
1365                 }
1366                 return '';
1367         }
1368
1369 }