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