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 $part1 Message key
  94          * @param mixed ...$params To pass to wfMessage()
  95          * @return array
  96          */
  97         public static function intFunction( $parser, $part1 = '', ...$params ) {
  98                 if ( strval( $part1 ) !== '' ) {
  99                         $message = wfMessage( $part1, $params )
 100                                 ->inLanguage( $parser->getOptions()->getUserLangObj() );
 101                         return [ $message->plain(), 'noparse' => false ];
 102                 } else {
 103                         return [ 'found' => false ];
 104                 }
 105         }
 106
 107         /**
 108          * @param Parser $parser
 109          * @param string $date
 110          * @param string|null $defaultPref
 111          *
 112          * @return string
 113          */
 114         public static function formatDate( $parser, $date, $defaultPref = null ) {
 115                 $lang = $parser->getFunctionLang();
 116                 $df = MediaWikiServices::getInstance()->getDateFormatterFactory()->get( $lang );
 117
 118                 $date = trim( $date );
 119
 120                 $pref = $parser->getOptions()->getDateFormat();
 121
 122                 // Specify a different default date format other than the normal default
 123                 // if the user has 'default' for their setting
 124                 if ( $pref == 'default' && $defaultPref ) {
 125                         $pref = $defaultPref;
 126                 }
 127
 128                 $date = $df->reformat( $pref, $date, [ 'match-whole' ] );
 129                 return $date;
 130         }
 131
 132         public static function ns( $parser, $part1 = '' ) {
 133                 if ( intval( $part1 ) || $part1 == "0" ) {
 134                         $index = intval( $part1 );
 135                 } else {
 136                         $index = $parser->getContentLanguage()->getNsIndex( str_replace( ' ', '_', $part1 ) );
 137                 }
 138                 if ( $index !== false ) {
 139                         return $parser->getContentLanguage()->getFormattedNsText( $index );
 140                 } else {
 141                         return [ 'found' => false ];
 142                 }
 143         }
 144
 145         public static function nse( $parser, $part1 = '' ) {
 146                 $ret = self::ns( $parser, $part1 );
 147                 if ( is_string( $ret ) ) {
 148                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 149                 }
 150                 return $ret;
 151         }
 152
 153         /**
 154          * urlencodes a string according to one of three patterns: (T24474)
 155          *
 156          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 157          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 158          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 159          *
 160          * @param Parser $parser
 161          * @param string $s The text to encode.
 162          * @param string|null $arg (optional): The type of encoding.
 163          * @return string
 164          */
 165         public static function urlencode( $parser, $s = '', $arg = null ) {
 166                 static $magicWords = null;
 167                 if ( is_null( $magicWords ) ) {
 168                         $magicWords =
 169                                 $parser->getMagicWordFactory()->newArray( [ 'url_path', 'url_query', 'url_wiki' ] );
 170                 }
 171                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 172                         // Encode as though it's a wiki page, '_' for ' '.
 173                         case 'url_wiki':
 174                                 $func = 'wfUrlencode';
 175                                 $s = str_replace( ' ', '_', $s );
 176                                 break;
 177
 178                         // Encode for an HTTP Path, '%20' for ' '.
 179                         case 'url_path':
 180                                 $func = 'rawurlencode';
 181                                 break;
 182
 183                         // Encode for HTTP query, '+' for ' '.
 184                         case 'url_query':
 185                         default:
 186                                 $func = 'urlencode';
 187                 }
 188                 // See T105242, where the choice to kill markers and various
 189                 // other options were discussed.
 190                 return $func( $parser->killMarkers( $s ) );
 191         }
 192
 193         public static function lcfirst( $parser, $s = '' ) {
 194                 return $parser->getContentLanguage()->lcfirst( $s );
 195         }
 196
 197         public static function ucfirst( $parser, $s = '' ) {
 198                 return $parser->getContentLanguage()->ucfirst( $s );
 199         }
 200
 201         /**
 202          * @param Parser $parser
 203          * @param string $s
 204          * @return string
 205          */
 206         public static function lc( $parser, $s = '' ) {
 207                 return $parser->markerSkipCallback( $s, [ $parser->getContentLanguage(), 'lc' ] );
 208         }
 209
 210         /**
 211          * @param Parser $parser
 212          * @param string $s
 213          * @return string
 214          */
 215         public static function uc( $parser, $s = '' ) {
 216                 return $parser->markerSkipCallback( $s, [ $parser->getContentLanguage(), 'uc' ] );
 217         }
 218
 219         public static function localurl( $parser, $s = '', $arg = null ) {
 220                 return self::urlFunction( 'getLocalURL', $s, $arg );
 221         }
 222
 223         public static function localurle( $parser, $s = '', $arg = null ) {
 224                 $temp = self::urlFunction( 'getLocalURL', $s, $arg );
 225                 if ( !is_string( $temp ) ) {
 226                         return $temp;
 227                 } else {
 228                         return htmlspecialchars( $temp );
 229                 }
 230         }
 231
 232         public static function fullurl( $parser, $s = '', $arg = null ) {
 233                 return self::urlFunction( 'getFullURL', $s, $arg );
 234         }
 235
 236         public static function fullurle( $parser, $s = '', $arg = null ) {
 237                 $temp = self::urlFunction( 'getFullURL', $s, $arg );
 238                 if ( !is_string( $temp ) ) {
 239                         return $temp;
 240                 } else {
 241                         return htmlspecialchars( $temp );
 242                 }
 243         }
 244
 245         public static function canonicalurl( $parser, $s = '', $arg = null ) {
 246                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 247         }
 248
 249         public static function canonicalurle( $parser, $s = '', $arg = null ) {
 250                 $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
 251                 if ( !is_string( $temp ) ) {
 252                         return $temp;
 253                 } else {
 254                         return htmlspecialchars( $temp );
 255                 }
 256         }
 257
 258         public static function urlFunction( $func, $s = '', $arg = null ) {
 259                 $title = Title::newFromText( $s );
 260                 # Due to order of execution of a lot of bits, the values might be encoded
 261                 # before arriving here; if that's true, then the title can't be created
 262                 # and the variable will fail. If we can't get a decent title from the first
 263                 # attempt, url-decode and try for a second.
 264                 if ( is_null( $title ) ) {
 265                         $title = Title::newFromURL( urldecode( $s ) );
 266                 }
 267                 if ( !is_null( $title ) ) {
 268                         # Convert NS_MEDIA -> NS_FILE
 269                         if ( $title->inNamespace( NS_MEDIA ) ) {
 270                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 271                         }
 272                         if ( !is_null( $arg ) ) {
 273                                 $text = $title->$func( $arg );
 274                         } else {
 275                                 $text = $title->$func();
 276                         }
 277                         return $text;
 278                 } else {
 279                         return [ 'found' => false ];
 280                 }
 281         }
 282
 283         /**
 284          * @param Parser $parser
 285          * @param string $num
 286          * @param string|null $arg
 287          * @return string
 288          */
 289         public static function formatnum( $parser, $num = '', $arg = null ) {
 290                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg ) ) {
 291                         $func = [ $parser->getFunctionLang(), 'parseFormattedNumber' ];
 292                 } elseif (
 293                         self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'nocommafysuffix', $arg )
 294                 ) {
 295                         $func = [ $parser->getFunctionLang(), 'formatNumNoSeparators' ];
 296                 } else {
 297                         $func = [ $parser->getFunctionLang(), 'formatNum' ];
 298                 }
 299                 return $parser->markerSkipCallback( $num, $func );
 300         }
 301
 302         /**
 303          * @param Parser $parser
 304          * @param string $case
 305          * @param string $word
 306          * @return string
 307          */
 308         public static function grammar( $parser, $case = '', $word = '' ) {
 309                 $word = $parser->killMarkers( $word );
 310                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 311         }
 312
 313         /**
 314          * @param Parser $parser
 315          * @param string $username
 316          * @param string ...$forms What to output for each gender
 317          * @return string
 318          */
 319         public static function gender( $parser, $username, ...$forms ) {
 320                 // Some shortcuts to avoid loading user data unnecessarily
 321                 if ( count( $forms ) === 0 ) {
 322                         return '';
 323                 } elseif ( count( $forms ) === 1 ) {
 324                         return $forms[0];
 325                 }
 326
 327                 $username = trim( $username );
 328
 329                 $gender = User::getDefaultOption( 'gender' );
 330
 331                 // allow prefix and normalize (e.g. "&#42;foo" -> "*foo" ).
 332                 $title = Title::newFromText( $username, NS_USER );
 333
 334                 if ( $title && $title->inNamespace( NS_USER ) ) {
 335                         $username = $title->getText();
 336                 }
 337
 338                 // check parameter, or use the ParserOptions if in interface message
 339                 $user = User::newFromName( $username );
 340                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
 341                 if ( $user ) {
 342                         $gender = $genderCache->getGenderOf( $user, __METHOD__ );
 343                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 344                         $gender = $genderCache->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 345                 }
 346                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 347                 return $ret;
 348         }
 349
 350         /**
 351          * @param Parser $parser
 352          * @param string $text
 353          * @param string ...$forms What to output for each number (singular, dual, plural, etc.)
 354          * @return string
 355          */
 356         public static function plural( $parser, $text = '', ...$forms ) {
 357                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 358                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 359                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 360         }
 361
 362         /**
 363          * @param Parser $parser
 364          * @param string $text
 365          * @return string
 366          */
 367         public static function bidi( $parser, $text = '' ) {
 368                 return $parser->getFunctionLang()->embedBidi( $text );
 369         }
 370
 371         /**
 372          * Override the title of the page when viewed, provided we've been given a
 373          * title which will normalise to the canonical title
 374          *
 375          * @param Parser $parser Parent parser
 376          * @param string $text Desired title text
 377          * @param string $uarg
 378          * @return string
 379          */
 380         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 381                 global $wgRestrictDisplayTitle;
 382
 383                 static $magicWords = null;
 384                 if ( is_null( $magicWords ) ) {
 385                         $magicWords = $parser->getMagicWordFactory()->newArray(
 386                                 [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
 387                 }
 388                 $arg = $magicWords->matchStartToEnd( $uarg );
 389
 390                 // parse a limited subset of wiki markup (just the single quote items)
 391                 $text = $parser->doQuotes( $text );
 392
 393                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 394                 $text = $parser->killMarkers( $text );
 395
 396                 // list of disallowed tags for DISPLAYTITLE
 397                 // these will be escaped even though they are allowed in normal wiki text
 398                 $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 399                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];
 400
 401                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 402                 if ( $wgRestrictDisplayTitle ) {
 403                         $htmlTagsCallback = function ( &$params ) {
 404                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 405
 406                                 if ( isset( $decoded['style'] ) ) {
 407                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 408                                         // calling it twice doesn't hurt
 409                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 410
 411                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 412                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 413                                         }
 414                                 }
 415
 416                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 417                         };
 418                 } else {
 419                         $htmlTagsCallback = null;
 420                 }
 421
 422                 // only requested titles that normalize to the actual title are allowed through
 423                 // if $wgRestrictDisplayTitle is true (it is by default)
 424                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 425                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 426                         $text,
 427                         $htmlTagsCallback,
 428                         [],
 429                         [],
 430                         $bad
 431                 ) );
 432                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 433
 434                 if ( !$wgRestrictDisplayTitle ||
 435                         ( $title instanceof Title
 436                         && !$title->hasFragment()
 437                         && $title->equals( $parser->mTitle ) )
 438                 ) {
 439                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 440                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 441                                 $parser->mOutput->setDisplayTitle( $text );
 442                         }
 443                         if ( $old !== false && $old !== $text && !$arg ) {
 444                                 $converter = $parser->getTargetLanguage()->getConverter();
 445                                 return '<span class="error">' .
 446                                         wfMessage( 'duplicate-displaytitle',
 447                                                 // Message should be parsed, but these params should only be escaped.
 448                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 449                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 450                                         )->inContentLanguage()->text() .
 451                                         '</span>';
 452                         } else {
 453                                 return '';
 454                         }
 455                 } else {
 456                         $parser->getOutput()->addWarning(
 457                                 wfMessage( 'restricted-displaytitle',
 458                                         // Message should be parsed, but this param should only be escaped.
 459                                         wfEscapeWikiText( $text )
 460                                 )->text()
 461                         );
 462                         $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
 463                 }
 464         }
 465
 466         /**
 467          * Matches the given value against the value of given magic word
 468          *
 469          * @param MagicWordFactory $magicWordFactory A factory to get the word from, e.g., from
 470          *   $parser->getMagicWordFactory()
 471          * @param string $magicword Magic word key
 472          * @param string $value Value to match
 473          * @return bool True on successful match
 474          */
 475         private static function matchAgainstMagicword(
 476                 MagicWordFactory $magicWordFactory, $magicword, $value
 477         ) {
 478                 $value = trim( strval( $value ) );
 479                 if ( $value === '' ) {
 480                         return false;
 481                 }
 482                 $mwObject = $magicWordFactory->get( $magicword );
 483                 return $mwObject->matchStartToEnd( $value );
 484         }
 485
 486         /**
 487          * Formats a number according to a language.
 488          *
 489          * @param int|float $num
 490          * @param string $raw
 491          * @param Language|StubUserLang $language
 492          * @param MagicWordFactory|null $magicWordFactory To evaluate $raw
 493          * @return string
 494          */
 495         public static function formatRaw(
 496                 $num, $raw, $language, MagicWordFactory $magicWordFactory = null
 497         ) {
 498                 if ( $raw !== null && !$magicWordFactory ) {
 499                         $magicWordFactory = MediaWikiServices::getInstance()->getMagicWordFactory();
 500                 }
 501                 if (
 502                         $raw !== null && self::matchAgainstMagicword( $magicWordFactory, 'rawsuffix', $raw )
 503                 ) {
 504                         return $num;
 505                 } else {
 506                         return $language->formatNum( $num );
 507                 }
 508         }
 509
 510         public static function numberofpages( $parser, $raw = null ) {
 511                 return self::formatRaw( SiteStats::pages(), $raw, $parser->getFunctionLang() );
 512         }
 513
 514         public static function numberofusers( $parser, $raw = null ) {
 515                 return self::formatRaw( SiteStats::users(), $raw, $parser->getFunctionLang() );
 516         }
 517         public static function numberofactiveusers( $parser, $raw = null ) {
 518                 return self::formatRaw( SiteStats::activeUsers(), $raw, $parser->getFunctionLang() );
 519         }
 520
 521         public static function numberofarticles( $parser, $raw = null ) {
 522                 return self::formatRaw( SiteStats::articles(), $raw, $parser->getFunctionLang() );
 523         }
 524
 525         public static function numberoffiles( $parser, $raw = null ) {
 526                 return self::formatRaw( SiteStats::images(), $raw, $parser->getFunctionLang() );
 527         }
 528
 529         public static function numberofadmins( $parser, $raw = null ) {
 530                 return self::formatRaw(
 531                         SiteStats::numberingroup( 'sysop' ),
 532                         $raw,
 533                         $parser->getFunctionLang()
 534                 );
 535         }
 536
 537         public static function numberofedits( $parser, $raw = null ) {
 538                 return self::formatRaw( SiteStats::edits(), $raw, $parser->getFunctionLang() );
 539         }
 540
 541         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 542                 return self::formatRaw(
 543                         SiteStats::pagesInNs( intval( $namespace ) ),
 544                         $raw,
 545                         $parser->getFunctionLang()
 546                 );
 547         }
 548         public static function numberingroup( $parser, $name = '', $raw = null ) {
 549                 return self::formatRaw(
 550                         SiteStats::numberingroup( strtolower( $name ) ),
 551                         $raw,
 552                         $parser->getFunctionLang()
 553                 );
 554         }
 555
 556         /**
 557          * Given a title, return the namespace name that would be given by the
 558          * corresponding magic word
 559          * Note: function name changed to "mwnamespace" rather than "namespace"
 560          * to not break PHP 5.3
 561          * @param Parser $parser
 562          * @param string|null $title
 563          * @return mixed|string
 564          */
 565         public static function mwnamespace( $parser, $title = null ) {
 566                 $t = Title::newFromText( $title );
 567                 if ( is_null( $t ) ) {
 568                         return '';
 569                 }
 570                 return str_replace( '_', ' ', $t->getNsText() );
 571         }
 572         public static function namespacee( $parser, $title = null ) {
 573                 $t = Title::newFromText( $title );
 574                 if ( is_null( $t ) ) {
 575                         return '';
 576                 }
 577                 return wfUrlencode( $t->getNsText() );
 578         }
 579         public static function namespacenumber( $parser, $title = null ) {
 580                 $t = Title::newFromText( $title );
 581                 if ( is_null( $t ) ) {
 582                         return '';
 583                 }
 584                 return $t->getNamespace();
 585         }
 586         public static function talkspace( $parser, $title = null ) {
 587                 $t = Title::newFromText( $title );
 588                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 589                         return '';
 590                 }
 591                 return str_replace( '_', ' ', $t->getTalkNsText() );
 592         }
 593         public static function talkspacee( $parser, $title = null ) {
 594                 $t = Title::newFromText( $title );
 595                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 596                         return '';
 597                 }
 598                 return wfUrlencode( $t->getTalkNsText() );
 599         }
 600         public static function subjectspace( $parser, $title = null ) {
 601                 $t = Title::newFromText( $title );
 602                 if ( is_null( $t ) ) {
 603                         return '';
 604                 }
 605                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 606         }
 607         public static function subjectspacee( $parser, $title = null ) {
 608                 $t = Title::newFromText( $title );
 609                 if ( is_null( $t ) ) {
 610                         return '';
 611                 }
 612                 return wfUrlencode( $t->getSubjectNsText() );
 613         }
 614
 615         /**
 616          * Functions to get and normalize pagenames, corresponding to the magic words
 617          * of the same names
 618          * @param Parser $parser
 619          * @param string|null $title
 620          * @return string
 621          */
 622         public static function pagename( $parser, $title = null ) {
 623                 $t = Title::newFromText( $title );
 624                 if ( is_null( $t ) ) {
 625                         return '';
 626                 }
 627                 return wfEscapeWikiText( $t->getText() );
 628         }
 629         public static function pagenamee( $parser, $title = null ) {
 630                 $t = Title::newFromText( $title );
 631                 if ( is_null( $t ) ) {
 632                         return '';
 633                 }
 634                 return wfEscapeWikiText( $t->getPartialURL() );
 635         }
 636         public static function fullpagename( $parser, $title = null ) {
 637                 $t = Title::newFromText( $title );
 638                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 639                         return '';
 640                 }
 641                 return wfEscapeWikiText( $t->getPrefixedText() );
 642         }
 643         public static function fullpagenamee( $parser, $title = null ) {
 644                 $t = Title::newFromText( $title );
 645                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 646                         return '';
 647                 }
 648                 return wfEscapeWikiText( $t->getPrefixedURL() );
 649         }
 650         public static function subpagename( $parser, $title = null ) {
 651                 $t = Title::newFromText( $title );
 652                 if ( is_null( $t ) ) {
 653                         return '';
 654                 }
 655                 return wfEscapeWikiText( $t->getSubpageText() );
 656         }
 657         public static function subpagenamee( $parser, $title = null ) {
 658                 $t = Title::newFromText( $title );
 659                 if ( is_null( $t ) ) {
 660                         return '';
 661                 }
 662                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 663         }
 664         public static function rootpagename( $parser, $title = null ) {
 665                 $t = Title::newFromText( $title );
 666                 if ( is_null( $t ) ) {
 667                         return '';
 668                 }
 669                 return wfEscapeWikiText( $t->getRootText() );
 670         }
 671         public static function rootpagenamee( $parser, $title = null ) {
 672                 $t = Title::newFromText( $title );
 673                 if ( is_null( $t ) ) {
 674                         return '';
 675                 }
 676                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
 677         }
 678         public static function basepagename( $parser, $title = null ) {
 679                 $t = Title::newFromText( $title );
 680                 if ( is_null( $t ) ) {
 681                         return '';
 682                 }
 683                 return wfEscapeWikiText( $t->getBaseText() );
 684         }
 685         public static function basepagenamee( $parser, $title = null ) {
 686                 $t = Title::newFromText( $title );
 687                 if ( is_null( $t ) ) {
 688                         return '';
 689                 }
 690                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 691         }
 692         public static function talkpagename( $parser, $title = null ) {
 693                 $t = Title::newFromText( $title );
 694                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 695                         return '';
 696                 }
 697                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 698         }
 699         public static function talkpagenamee( $parser, $title = null ) {
 700                 $t = Title::newFromText( $title );
 701                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 702                         return '';
 703                 }
 704                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 705         }
 706         public static function subjectpagename( $parser, $title = null ) {
 707                 $t = Title::newFromText( $title );
 708                 if ( is_null( $t ) ) {
 709                         return '';
 710                 }
 711                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 712         }
 713         public static function subjectpagenamee( $parser, $title = null ) {
 714                 $t = Title::newFromText( $title );
 715                 if ( is_null( $t ) ) {
 716                         return '';
 717                 }
 718                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 719         }
 720
 721         /**
 722          * Return the number of pages, files or subcats in the given category,
 723          * or 0 if it's nonexistent. This is an expensive parser function and
 724          * can't be called too many times per page.
 725          * @param Parser $parser
 726          * @param string $name
 727          * @param string|null $arg1
 728          * @param string|null $arg2
 729          * @return string
 730          */
 731         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 732                 static $magicWords = null;
 733                 if ( is_null( $magicWords ) ) {
 734                         $magicWords = $parser->getMagicWordFactory()->newArray( [
 735                                 'pagesincategory_all',
 736                                 'pagesincategory_pages',
 737                                 'pagesincategory_subcats',
 738                                 'pagesincategory_files'
 739                         ] );
 740                 }
 741                 static $cache = [];
 742
 743                 // split the given option to its variable
 744                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg1 ) ) {
 745                         // {{pagesincategory:|raw[|type]}}
 746                         $raw = $arg1;
 747                         $type = $magicWords->matchStartToEnd( $arg2 );
 748                 } else {
 749                         // {{pagesincategory:[|type[|raw]]}}
 750                         $type = $magicWords->matchStartToEnd( $arg1 );
 751                         $raw = $arg2;
 752                 }
 753                 if ( !$type ) { // backward compatibility
 754                         $type = 'pagesincategory_all';
 755                 }
 756
 757                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 758                 if ( !$title ) { # invalid title
 759                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 760                 }
 761                 $parser->getContentLanguage()->findVariantLink( $name, $title, true );
 762
 763                 // Normalize name for cache
 764                 $name = $title->getDBkey();
 765
 766                 if ( !isset( $cache[$name] ) ) {
 767                         $category = Category::newFromTitle( $title );
 768
 769                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 770                         if ( $parser->incrementExpensiveFunctionCount() ) {
 771                                 // $allCount is the total number of cat members,
 772                                 // not the count of how many members are normal pages.
 773                                 $allCount = (int)$category->getPageCount();
 774                                 $subcatCount = (int)$category->getSubcatCount();
 775                                 $fileCount = (int)$category->getFileCount();
 776                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 777                         }
 778                         $cache[$name]['pagesincategory_all'] = $allCount;
 779                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 780                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 781                         $cache[$name]['pagesincategory_files'] = $fileCount;
 782                 }
 783
 784                 $count = $cache[$name][$type];
 785                 return self::formatRaw( $count, $raw, $parser->getFunctionLang() );
 786         }
 787
 788         /**
 789          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 790          * expensive parser function and can't be called too many times per page.
 791          *
 792          * @param Parser $parser
 793          * @param string $page Name of page to check (Default: empty string)
 794          * @param string|null $raw Should number be human readable with commas or just number
 795          * @return string
 796          */
 797         public static function pagesize( $parser, $page = '', $raw = null ) {
 798                 $title = Title::newFromText( $page );
 799
 800                 if ( !is_object( $title ) ) {
 801                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 802                 }
 803
 804                 // fetch revision from cache/database and return the value
 805                 $rev = self::getCachedRevisionObject( $parser, $title );
 806                 $length = $rev ? $rev->getSize() : 0;
 807                 if ( $length === null ) {
 808                         // We've had bugs where rev_len was not being recorded for empty pages, see T135414
 809                         $length = 0;
 810                 }
 811                 return self::formatRaw( $length, $raw, $parser->getFunctionLang() );
 812         }
 813
 814         /**
 815          * Returns the requested protection level for the current page. This
 816          * is an expensive parser function and can't be called too many times
 817          * per page, unless the protection levels/expiries for the given title
 818          * have already been retrieved
 819          *
 820          * @param Parser $parser
 821          * @param string $type
 822          * @param string $title
 823          *
 824          * @return string
 825          */
 826         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 827                 $titleObject = Title::newFromText( $title );
 828                 if ( !( $titleObject instanceof Title ) ) {
 829                         $titleObject = $parser->mTitle;
 830                 }
 831                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 832                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 833                         # Title::getRestrictions returns an array, its possible it may have
 834                         # multiple values in the future
 835                         return implode( ',', $restrictions );
 836                 }
 837                 return '';
 838         }
 839
 840         /**
 841          * Returns the requested protection expiry for the current page. This
 842          * is an expensive parser function and can't be called too many times
 843          * per page, unless the protection levels/expiries for the given title
 844          * have already been retrieved
 845          *
 846          * @param Parser $parser
 847          * @param string $type
 848          * @param string $title
 849          *
 850          * @return string
 851          */
 852         public static function protectionexpiry( $parser, $type = '', $title = '' ) {
 853                 $titleObject = Title::newFromText( $title );
 854                 if ( !( $titleObject instanceof Title ) ) {
 855                         $titleObject = $parser->mTitle;
 856                 }
 857                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 858                         $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
 859                         // getRestrictionExpiry() returns false on invalid type; trying to
 860                         // match protectionlevel() function that returns empty string instead
 861                         if ( $expiry === false ) {
 862                                 $expiry = '';
 863                         }
 864                         return $expiry;
 865                 }
 866                 return '';
 867         }
 868
 869         /**
 870          * Gives language names.
 871          * @param Parser $parser
 872          * @param string $code Language code (of which to get name)
 873          * @param string $inLanguage Language code (in which to get name)
 874          * @return string
 875          */
 876         public static function language( $parser, $code = '', $inLanguage = '' ) {
 877                 $code = strtolower( $code );
 878                 $inLanguage = strtolower( $inLanguage );
 879                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 880                 return $lang !== '' ? $lang : LanguageCode::bcp47( $code );
 881         }
 882
 883         /**
 884          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 885          * @param Parser $parser
 886          * @param string $string
 887          * @param string $length
 888          * @param string $padding
 889          * @param int $direction
 890          * @return string
 891          */
 892         public static function pad(
 893                 $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
 894         ) {
 895                 $padding = $parser->killMarkers( $padding );
 896                 $lengthOfPadding = mb_strlen( $padding );
 897                 if ( $lengthOfPadding == 0 ) {
 898                         return $string;
 899                 }
 900
 901                 # The remaining length to add counts down to 0 as padding is added
 902                 $length = min( (int)$length, 500 ) - mb_strlen( $string );
 903                 if ( $length <= 0 ) {
 904                         // Nothing to add
 905                         return $string;
 906                 }
 907
 908                 # $finalPadding is just $padding repeated enough times so that
 909                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 910                 $finalPadding = '';
 911                 while ( $length > 0 ) {
 912                         # If $length < $lengthofPadding, truncate $padding so we get the
 913                         # exact length desired.
 914                         $finalPadding .= mb_substr( $padding, 0, $length );
 915                         $length -= $lengthOfPadding;
 916                 }
 917
 918                 if ( $direction == STR_PAD_LEFT ) {
 919                         return $finalPadding . $string;
 920                 } else {
 921                         return $string . $finalPadding;
 922                 }
 923         }
 924
 925         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 926                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 927         }
 928
 929         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 930                 return self::pad( $parser, $string, $length, $padding );
 931         }
 932
 933         /**
 934          * @param Parser $parser
 935          * @param string $text
 936          * @return string
 937          */
 938         public static function anchorencode( $parser, $text ) {
 939                 $text = $parser->killMarkers( $text );
 940                 $section = (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 941                 return Sanitizer::safeEncodeAttribute( $section );
 942         }
 943
 944         public static function special( $parser, $text ) {
 945                 list( $page, $subpage ) = MediaWikiServices::getInstance()->getSpecialPageFactory()->
 946                         resolveAlias( $text );
 947                 if ( $page ) {
 948                         $title = SpecialPage::getTitleFor( $page, $subpage );
 949                         return $title->getPrefixedText();
 950                 } else {
 951                         // unknown special page, just use the given text as its title, if at all possible
 952                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 953                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 954                 }
 955         }
 956
 957         public static function speciale( $parser, $text ) {
 958                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 959         }
 960
 961         /**
 962          * @param Parser $parser
 963          * @param string $text The sortkey to use
 964          * @param string $uarg Either "noreplace" or "noerror" (in en)
 965          *   both suppress errors, and noreplace does nothing if
 966          *   a default sortkey already exists.
 967          * @return string
 968          */
 969         public static function defaultsort( $parser, $text, $uarg = '' ) {
 970                 static $magicWords = null;
 971                 if ( is_null( $magicWords ) ) {
 972                         $magicWords = $parser->getMagicWordFactory()->newArray(
 973                                 [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
 974                 }
 975                 $arg = $magicWords->matchStartToEnd( $uarg );
 976
 977                 $text = trim( $text );
 978                 if ( strlen( $text ) == 0 ) {
 979                         return '';
 980                 }
 981                 $old = $parser->getCustomDefaultSort();
 982                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 983                         $parser->setDefaultSort( $text );
 984                 }
 985
 986                 if ( $old === false || $old == $text || $arg ) {
 987                         return '';
 988                 } else {
 989                         $converter = $parser->getTargetLanguage()->getConverter();
 990                         return '<span class="error">' .
 991                                 wfMessage( 'duplicate-defaultsort',
 992                                         // Message should be parsed, but these params should only be escaped.
 993                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 994                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 995                                 )->inContentLanguage()->text() .
 996                                 '</span>';
 997                 }
 998         }
 999
1000         /**
1001          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
1002          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
1003          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
1004          *
1005          * @param Parser $parser
1006          * @param string $name
1007          * @param string $argA
1008          * @param string $argB
1009          * @return array|string
1010          */
1011         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
1012                 $file = wfFindFile( $name );
1013
1014                 if ( $argA == 'nowiki' ) {
1015                         // {{filepath: | option [| size] }}
1016                         $isNowiki = true;
1017                         $parsedWidthParam = Parser::parseWidthParam( $argB );
1018                 } else {
1019                         // {{filepath: [| size [|option]] }}
1020                         $parsedWidthParam = Parser::parseWidthParam( $argA );
1021                         $isNowiki = ( $argB == 'nowiki' );
1022                 }
1023
1024                 if ( $file ) {
1025                         $url = $file->getFullUrl();
1026
1027                         // If a size is requested...
1028                         if ( count( $parsedWidthParam ) ) {
1029                                 $mto = $file->transform( $parsedWidthParam );
1030                                 // ... and we can
1031                                 if ( $mto && !$mto->isError() ) {
1032                                         // ... change the URL to point to a thumbnail.
1033                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
1034                                 }
1035                         }
1036                         if ( $isNowiki ) {
1037                                 return [ $url, 'nowiki' => true ];
1038                         }
1039                         return $url;
1040                 } else {
1041                         return '';
1042                 }
1043         }
1044
1045         /**
1046          * Parser function to extension tag adaptor
1047          * @param Parser $parser
1048          * @param PPFrame $frame
1049          * @param PPNode[] $args
1050          * @return string
1051          */
1052         public static function tagObj( $parser, $frame, $args ) {
1053                 if ( !count( $args ) ) {
1054                         return '';
1055                 }
1056                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
1057
1058                 if ( count( $args ) ) {
1059                         $inner = $frame->expand( array_shift( $args ) );
1060                 } else {
1061                         $inner = null;
1062                 }
1063
1064                 $attributes = [];
1065                 foreach ( $args as $arg ) {
1066                         $bits = $arg->splitArg();
1067                         if ( strval( $bits['index'] ) === '' ) {
1068                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1069                                 $value = trim( $frame->expand( $bits['value'] ) );
1070                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
1071                                         $value = $m[1] ?? '';
1072                                 }
1073                                 $attributes[$name] = $value;
1074                         }
1075                 }
1076
1077                 $stripList = $parser->getStripList();
1078                 if ( !in_array( $tagName, $stripList ) ) {
1079                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
1080                         $attrText = '';
1081                         foreach ( $attributes as $name => $value ) {
1082                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
1083                         }
1084                         if ( $inner === null ) {
1085                                 return "<$tagName$attrText/>";
1086                         }
1087                         return "<$tagName$attrText>$inner</$tagName>";
1088                 }
1089
1090                 $params = [
1091                         'name' => $tagName,
1092                         'inner' => $inner,
1093                         'attributes' => $attributes,
1094                         'close' => "</$tagName>",
1095                 ];
1096                 return $parser->extensionSubstitution( $params, $frame );
1097         }
1098
1099         /**
1100          * Fetched the current revision of the given title and return this.
1101          * Will increment the expensive function count and
1102          * add a template link to get the value refreshed on changes.
1103          * For a given title, which is equal to the current parser title,
1104          * the revision object from the parser is used, when that is the current one
1105          *
1106          * @param Parser $parser
1107          * @param Title $title
1108          * @return Revision
1109          * @since 1.23
1110          */
1111         private static function getCachedRevisionObject( $parser, $title = null ) {
1112                 if ( is_null( $title ) ) {
1113                         return null;
1114                 }
1115
1116                 // Use the revision from the parser itself, when param is the current page
1117                 // and the revision is the current one
1118                 if ( $title->equals( $parser->getTitle() ) ) {
1119                         $parserRev = $parser->getRevisionObject();
1120                         if ( $parserRev && $parserRev->isCurrent() ) {
1121                                 // force reparse after edit with vary-revision flag
1122                                 $parser->getOutput()->setFlag( 'vary-revision' );
1123                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1124                                 return $parserRev;
1125                         }
1126                 }
1127
1128                 // Normalize name for cache
1129                 $page = $title->getPrefixedDBkey();
1130
1131                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1132                         && !$parser->incrementExpensiveFunctionCount() ) {
1133                         return null;
1134                 }
1135                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1136                 $pageID = $rev ? $rev->getPage() : 0;
1137                 $revID = $rev ? $rev->getId() : 0;
1138
1139                 // Register dependency in templatelinks
1140                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1141
1142                 return $rev;
1143         }
1144
1145         /**
1146          * Get the pageid of a specified page
1147          * @param Parser $parser
1148          * @param string|null $title Title to get the pageid from
1149          * @return int|null|string
1150          * @since 1.23
1151          */
1152         public static function pageid( $parser, $title = null ) {
1153                 $t = Title::newFromText( $title );
1154                 if ( is_null( $t ) ) {
1155                         return '';
1156                 }
1157                 // Use title from parser to have correct pageid after edit
1158                 if ( $t->equals( $parser->getTitle() ) ) {
1159                         $t = $parser->getTitle();
1160                         return $t->getArticleID();
1161                 }
1162
1163                 // These can't have ids
1164                 if ( !$t->canExist() || $t->isExternal() ) {
1165                         return 0;
1166                 }
1167
1168                 // Check the link cache, maybe something already looked it up.
1169                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1170                 $pdbk = $t->getPrefixedDBkey();
1171                 $id = $linkCache->getGoodLinkID( $pdbk );
1172                 if ( $id != 0 ) {
1173                         $parser->mOutput->addLink( $t, $id );
1174                         return $id;
1175                 }
1176                 if ( $linkCache->isBadLink( $pdbk ) ) {
1177                         $parser->mOutput->addLink( $t, 0 );
1178                         return $id;
1179                 }
1180
1181                 // We need to load it from the DB, so mark expensive
1182                 if ( $parser->incrementExpensiveFunctionCount() ) {
1183                         $id = $t->getArticleID();
1184                         $parser->mOutput->addLink( $t, $id );
1185                         return $id;
1186                 }
1187                 return null;
1188         }
1189
1190         /**
1191          * Get the id from the last revision of a specified page.
1192          * @param Parser $parser
1193          * @param string|null $title Title to get the id from
1194          * @return int|null|string
1195          * @since 1.23
1196          */
1197         public static function revisionid( $parser, $title = null ) {
1198                 $t = Title::newFromText( $title );
1199                 if ( is_null( $t ) ) {
1200                         return '';
1201                 }
1202                 // fetch revision from cache/database and return the value
1203                 $rev = self::getCachedRevisionObject( $parser, $t );
1204                 return $rev ? $rev->getId() : '';
1205         }
1206
1207         /**
1208          * Get the day from the last revision of a specified page.
1209          * @param Parser $parser
1210          * @param string|null $title Title to get the day from
1211          * @return string
1212          * @since 1.23
1213          */
1214         public static function revisionday( $parser, $title = null ) {
1215                 $t = Title::newFromText( $title );
1216                 if ( is_null( $t ) ) {
1217                         return '';
1218                 }
1219                 // fetch revision from cache/database and return the value
1220                 $rev = self::getCachedRevisionObject( $parser, $t );
1221                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1222         }
1223
1224         /**
1225          * Get the day with leading zeros from the last revision of a specified page.
1226          * @param Parser $parser
1227          * @param string|null $title Title to get the day from
1228          * @return string
1229          * @since 1.23
1230          */
1231         public static function revisionday2( $parser, $title = null ) {
1232                 $t = Title::newFromText( $title );
1233                 if ( is_null( $t ) ) {
1234                         return '';
1235                 }
1236                 // fetch revision from cache/database and return the value
1237                 $rev = self::getCachedRevisionObject( $parser, $t );
1238                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1239         }
1240
1241         /**
1242          * Get the month with leading zeros from the last revision of a specified page.
1243          * @param Parser $parser
1244          * @param string|null $title Title to get the month from
1245          * @return string
1246          * @since 1.23
1247          */
1248         public static function revisionmonth( $parser, $title = null ) {
1249                 $t = Title::newFromText( $title );
1250                 if ( is_null( $t ) ) {
1251                         return '';
1252                 }
1253                 // fetch revision from cache/database and return the value
1254                 $rev = self::getCachedRevisionObject( $parser, $t );
1255                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1256         }
1257
1258         /**
1259          * Get the month from the last revision of a specified page.
1260          * @param Parser $parser
1261          * @param string|null $title Title to get the month from
1262          * @return string
1263          * @since 1.23
1264          */
1265         public static function revisionmonth1( $parser, $title = null ) {
1266                 $t = Title::newFromText( $title );
1267                 if ( is_null( $t ) ) {
1268                         return '';
1269                 }
1270                 // fetch revision from cache/database and return the value
1271                 $rev = self::getCachedRevisionObject( $parser, $t );
1272                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1273         }
1274
1275         /**
1276          * Get the year from the last revision of a specified page.
1277          * @param Parser $parser
1278          * @param string|null $title Title to get the year from
1279          * @return string
1280          * @since 1.23
1281          */
1282         public static function revisionyear( $parser, $title = null ) {
1283                 $t = Title::newFromText( $title );
1284                 if ( is_null( $t ) ) {
1285                         return '';
1286                 }
1287                 // fetch revision from cache/database and return the value
1288                 $rev = self::getCachedRevisionObject( $parser, $t );
1289                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1290         }
1291
1292         /**
1293          * Get the timestamp from the last revision of a specified page.
1294          * @param Parser $parser
1295          * @param string|null $title Title to get the timestamp from
1296          * @return string
1297          * @since 1.23
1298          */
1299         public static function revisiontimestamp( $parser, $title = null ) {
1300                 $t = Title::newFromText( $title );
1301                 if ( is_null( $t ) ) {
1302                         return '';
1303                 }
1304                 // fetch revision from cache/database and return the value
1305                 $rev = self::getCachedRevisionObject( $parser, $t );
1306                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1307         }
1308
1309         /**
1310          * Get the user from the last revision of a specified page.
1311          * @param Parser $parser
1312          * @param string|null $title Title to get the user from
1313          * @return string
1314          * @since 1.23
1315          */
1316         public static function revisionuser( $parser, $title = null ) {
1317                 $t = Title::newFromText( $title );
1318                 if ( is_null( $t ) ) {
1319                         return '';
1320                 }
1321                 // fetch revision from cache/database and return the value
1322                 $rev = self::getCachedRevisionObject( $parser, $t );
1323                 return $rev ? $rev->getUserText() : '';
1324         }
1325
1326         /**
1327          * Returns the sources of any cascading protection acting on a specified page.
1328          * Pages will not return their own title unless they transclude themselves.
1329          * This is an expensive parser function and can't be called too many times per page,
1330          * unless cascading protection sources for the page have already been loaded.
1331          *
1332          * @param Parser $parser
1333          * @param string $title
1334          *
1335          * @return string
1336          * @since 1.23
1337          */
1338         public static function cascadingsources( $parser, $title = '' ) {
1339                 $titleObject = Title::newFromText( $title );
1340                 if ( !( $titleObject instanceof Title ) ) {
1341                         $titleObject = $parser->mTitle;
1342                 }
1343                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1344                         || $parser->incrementExpensiveFunctionCount()
1345                 ) {
1346                         $names = [];
1347                         $sources = $titleObject->getCascadeProtectionSources();
1348                         foreach ( $sources[0] as $sourceTitle ) {
1349                                 $names[] = $sourceTitle->getPrefixedText();
1350                         }
1351                         return implode( '|', $names );
1352                 }
1353                 return '';
1354         }
1355
1356 }