includes/parser/CoreParserFunctions.php

   1 <?php
   2 /**
   3  * Parser functions provided by MediaWiki core
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Parser
  22  */
  23 use MediaWiki\MediaWikiServices;
  24
  25 /**
  26  * Various core parser functions, registered in Parser::firstCallInit()
  27  * @ingroup Parser
  28  */
  29 class CoreParserFunctions {
  30         /**
  31          * @param Parser $parser
  32          * @return void
  33          */
  34         public static function register( $parser ) {
  35                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  36
  37                 # Syntax for arguments (see Parser::setFunctionHook):
  38                 #  "name for lookup in localized magic words array",
  39                 #  function callback,
  40                 #  optional Parser::SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}}
  41                 #    instead of {{#int:...}})
  42                 $noHashFunctions = [
  43                         'ns', 'nse', 'urlencode', 'lcfirst', 'ucfirst', 'lc', 'uc',
  44                         'localurl', 'localurle', 'fullurl', 'fullurle', 'canonicalurl',
  45                         'canonicalurle', 'formatnum', 'grammar', 'gender', 'plural', 'bidi',
  46                         'numberofpages', 'numberofusers', 'numberofactiveusers',
  47                         'numberofarticles', 'numberoffiles', 'numberofadmins',
  48                         'numberingroup', 'numberofedits', 'language',
  49                         'padleft', 'padright', 'anchorencode', 'defaultsort', 'filepath',
  50                         'pagesincategory', 'pagesize', 'protectionlevel', 'protectionexpiry',
  51                         'namespacee', 'namespacenumber', 'talkspace', 'talkspacee',
  52                         'subjectspace', 'subjectspacee', 'pagename', 'pagenamee',
  53                         'fullpagename', 'fullpagenamee', 'rootpagename', 'rootpagenamee',
  54                         'basepagename', 'basepagenamee', 'subpagename', 'subpagenamee',
  55                         'talkpagename', 'talkpagenamee', 'subjectpagename',
  56                         'subjectpagenamee', 'pageid', 'revisionid', 'revisionday',
  57                         'revisionday2', 'revisionmonth', 'revisionmonth1', 'revisionyear',
  58                         'revisiontimestamp', 'revisionuser', 'cascadingsources',
  59                 ];
  60                 foreach ( $noHashFunctions as $func ) {
  61                         $parser->setFunctionHook( $func, [ __CLASS__, $func ], Parser::SFH_NO_HASH );
  62                 }
  63
  64                 $parser->setFunctionHook(
  65                         'namespace',
  66                         [ __CLASS__, 'mwnamespace' ],
  67                         Parser::SFH_NO_HASH
  68                 );
  69                 $parser->setFunctionHook( 'int', [ __CLASS__, 'intFunction' ], Parser::SFH_NO_HASH );
  70                 $parser->setFunctionHook( 'special', [ __CLASS__, 'special' ] );
  71                 $parser->setFunctionHook( 'speciale', [ __CLASS__, 'speciale' ] );
  72                 $parser->setFunctionHook( 'tag', [ __CLASS__, 'tagObj' ], Parser::SFH_OBJECT_ARGS );
  73                 $parser->setFunctionHook( 'formatdate', [ __CLASS__, 'formatDate' ] );
  74
  75                 if ( $wgAllowDisplayTitle ) {
  76                         $parser->setFunctionHook(
  77                                 'displaytitle',
  78                                 [ __CLASS__, 'displaytitle' ],
  79                                 Parser::SFH_NO_HASH
  80                         );
  81                 }
  82                 if ( $wgAllowSlowParserFunctions ) {
  83                         $parser->setFunctionHook(
  84                                 'pagesinnamespace',
  85                                 [ __CLASS__, 'pagesinnamespace' ],
  86                                 Parser::SFH_NO_HASH
  87                         );
  88                 }
  89         }
  90
  91         /**
  92          * @param Parser $parser
  93          * @param string $part1
  94          * @return array
  95          */
  96         public static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  97                 if ( strval( $part1 ) !== '' ) {
  98                         $args = array_slice( func_get_args(), 2 );
  99                         $message = wfMessage( $part1, $args )
 100                                 ->inLanguage( $parser->getOptions()->getUserLangObj() );
 101                         if ( !$message->exists() ) {
 102                                 // When message does not exists, the message name is surrounded by angle
 103                                 // and can result in a tag, therefore escape the angles
 104                                 return $message->escaped();
 105                         }
 106                         return [ $message->plain(), 'noparse' => false ];
 107                 } else {
 108                         return [ 'found' => false ];
 109                 }
 110         }
 111
 112         /**
 113          * @param Parser $parser
 114          * @param string $date
 115          * @param string|null $defaultPref
 116          *
 117          * @return string
 118          */
 119         public static function formatDate( $parser, $date, $defaultPref = null ) {
 120                 $lang = $parser->getFunctionLang();
 121                 $df = DateFormatter::getInstance( $lang );
 122
 123                 $date = trim( $date );
 124
 125                 $pref = $parser->getOptions()->getDateFormat();
 126
 127                 // Specify a different default date format other than the normal default
 128                 // if the user has 'default' for their setting
 129                 if ( $pref == 'default' && $defaultPref ) {
 130                         $pref = $defaultPref;
 131                 }
 132
 133                 $date = $df->reformat( $pref, $date, [ 'match-whole' ] );
 134                 return $date;
 135         }
 136
 137         public static function ns( $parser, $part1 = '' ) {
 138                 global $wgContLang;
 139                 if ( intval( $part1 ) || $part1 == "0" ) {
 140                         $index = intval( $part1 );
 141                 } else {
 142                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 143                 }
 144                 if ( $index !== false ) {
 145                         return $wgContLang->getFormattedNsText( $index );
 146                 } else {
 147                         return [ 'found' => false ];
 148                 }
 149         }
 150
 151         public static function nse( $parser, $part1 = '' ) {
 152                 $ret = self::ns( $parser, $part1 );
 153                 if ( is_string( $ret ) ) {
 154                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 155                 }
 156                 return $ret;
 157         }
 158
 159         /**
 160          * urlencodes a string according to one of three patterns: (T24474)
 161          *
 162          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 163          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 164          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 165          *
 166          * @param Parser $parser
 167          * @param string $s The text to encode.
 168          * @param string|null $arg (optional): The type of encoding.
 169          * @return string
 170          */
 171         public static function urlencode( $parser, $s = '', $arg = null ) {
 172                 static $magicWords = null;
 173                 if ( is_null( $magicWords ) ) {
 174                         $magicWords = new MagicWordArray( [ 'url_path', 'url_query', 'url_wiki' ] );
 175                 }
 176                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 177                         // Encode as though it's a wiki page, '_' for ' '.
 178                         case 'url_wiki':
 179                                 $func = 'wfUrlencode';
 180                                 $s = str_replace( ' ', '_', $s );
 181                                 break;
 182
 183                         // Encode for an HTTP Path, '%20' for ' '.
 184                         case 'url_path':
 185                                 $func = 'rawurlencode';
 186                                 break;
 187
 188                         // Encode for HTTP query, '+' for ' '.
 189                         case 'url_query':
 190                         default:
 191                                 $func = 'urlencode';
 192                 }
 193                 // See T105242, where the choice to kill markers and various
 194                 // other options were discussed.
 195                 return $func( $parser->killMarkers( $s ) );
 196         }
 197
 198         public static function lcfirst( $parser, $s = '' ) {
 199                 global $wgContLang;
 200                 return $wgContLang->lcfirst( $s );
 201         }
 202
 203         public static function ucfirst( $parser, $s = '' ) {
 204                 global $wgContLang;
 205                 return $wgContLang->ucfirst( $s );
 206         }
 207
 208         /**
 209          * @param Parser $parser
 210          * @param string $s
 211          * @return string
 212          */
 213         public static function lc( $parser, $s = '' ) {
 214                 global $wgContLang;
 215                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'lc' ] );
 216         }
 217
 218         /**
 219          * @param Parser $parser
 220          * @param string $s
 221          * @return string
 222          */
 223         public static function uc( $parser, $s = '' ) {
 224                 global $wgContLang;
 225                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'uc' ] );
 226         }
 227
 228         public static function localurl( $parser, $s = '', $arg = null ) {
 229                 return self::urlFunction( 'getLocalURL', $s, $arg );
 230         }
 231
 232         public static function localurle( $parser, $s = '', $arg = null ) {
 233                 $temp = self::urlFunction( 'getLocalURL', $s, $arg );
 234                 if ( !is_string( $temp ) ) {
 235                         return $temp;
 236                 } else {
 237                         return htmlspecialchars( $temp );
 238                 }
 239         }
 240
 241         public static function fullurl( $parser, $s = '', $arg = null ) {
 242                 return self::urlFunction( 'getFullURL', $s, $arg );
 243         }
 244
 245         public static function fullurle( $parser, $s = '', $arg = null ) {
 246                 $temp = self::urlFunction( 'getFullURL', $s, $arg );
 247                 if ( !is_string( $temp ) ) {
 248                         return $temp;
 249                 } else {
 250                         return htmlspecialchars( $temp );
 251                 }
 252         }
 253
 254         public static function canonicalurl( $parser, $s = '', $arg = null ) {
 255                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 256         }
 257
 258         public static function canonicalurle( $parser, $s = '', $arg = null ) {
 259                 $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
 260                 if ( !is_string( $temp ) ) {
 261                         return $temp;
 262                 } else {
 263                         return htmlspecialchars( $temp );
 264                 }
 265         }
 266
 267         public static function urlFunction( $func, $s = '', $arg = null ) {
 268                 $title = Title::newFromText( $s );
 269                 # Due to order of execution of a lot of bits, the values might be encoded
 270                 # before arriving here; if that's true, then the title can't be created
 271                 # and the variable will fail. If we can't get a decent title from the first
 272                 # attempt, url-decode and try for a second.
 273                 if ( is_null( $title ) ) {
 274                         $title = Title::newFromURL( urldecode( $s ) );
 275                 }
 276                 if ( !is_null( $title ) ) {
 277                         # Convert NS_MEDIA -> NS_FILE
 278                         if ( $title->inNamespace( NS_MEDIA ) ) {
 279                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 280                         }
 281                         if ( !is_null( $arg ) ) {
 282                                 $text = $title->$func( $arg );
 283                         } else {
 284                                 $text = $title->$func();
 285                         }
 286                         return $text;
 287                 } else {
 288                         return [ 'found' => false ];
 289                 }
 290         }
 291
 292         /**
 293          * @param Parser $parser
 294          * @param string $num
 295          * @param string|null $arg
 296          * @return string
 297          */
 298         public static function formatnum( $parser, $num = '', $arg = null ) {
 299                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg ) ) {
 300                         $func = [ $parser->getFunctionLang(), 'parseFormattedNumber' ];
 301                 } elseif (
 302                         self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'nocommafysuffix', $arg )
 303                 ) {
 304                         $func = [ $parser->getFunctionLang(), 'formatNumNoSeparators' ];
 305                 } else {
 306                         $func = [ $parser->getFunctionLang(), 'formatNum' ];
 307                 }
 308                 return $parser->markerSkipCallback( $num, $func );
 309         }
 310
 311         /**
 312          * @param Parser $parser
 313          * @param string $case
 314          * @param string $word
 315          * @return string
 316          */
 317         public static function grammar( $parser, $case = '', $word = '' ) {
 318                 $word = $parser->killMarkers( $word );
 319                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 320         }
 321
 322         /**
 323          * @param Parser $parser
 324          * @param string $username
 325          * @return string
 326          */
 327         public static function gender( $parser, $username ) {
 328                 $forms = array_slice( func_get_args(), 2 );
 329
 330                 // Some shortcuts to avoid loading user data unnecessarily
 331                 if ( count( $forms ) === 0 ) {
 332                         return '';
 333                 } elseif ( count( $forms ) === 1 ) {
 334                         return $forms[0];
 335                 }
 336
 337                 $username = trim( $username );
 338
 339                 // default
 340                 $gender = User::getDefaultOption( 'gender' );
 341
 342                 // allow prefix and normalize (e.g. "&#42;foo" -> "*foo" ).
 343                 $title = Title::newFromText( $username, NS_USER );
 344
 345                 if ( $title && $title->inNamespace( NS_USER ) ) {
 346                         $username = $title->getText();
 347                 }
 348
 349                 // check parameter, or use the ParserOptions if in interface message
 350                 $user = User::newFromName( $username );
 351                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
 352                 if ( $user ) {
 353                         $gender = $genderCache->getGenderOf( $user, __METHOD__ );
 354                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 355                         $gender = $genderCache->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 356                 }
 357                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 358                 return $ret;
 359         }
 360
 361         /**
 362          * @param Parser $parser
 363          * @param string $text
 364          * @return string
 365          */
 366         public static function plural( $parser, $text = '' ) {
 367                 $forms = array_slice( func_get_args(), 2 );
 368                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 369                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 370                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 371         }
 372
 373         /**
 374          * @param Parser $parser
 375          * @param string $text
 376          * @return string
 377          */
 378         public static function bidi( $parser, $text = '' ) {
 379                 return $parser->getFunctionLang()->embedBidi( $text );
 380         }
 381
 382         /**
 383          * Override the title of the page when viewed, provided we've been given a
 384          * title which will normalise to the canonical title
 385          *
 386          * @param Parser $parser Parent parser
 387          * @param string $text Desired title text
 388          * @param string $uarg
 389          * @return string
 390          */
 391         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 392                 global $wgRestrictDisplayTitle;
 393
 394                 static $magicWords = null;
 395                 if ( is_null( $magicWords ) ) {
 396                         $magicWords = new MagicWordArray( [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
 397                 }
 398                 $arg = $magicWords->matchStartToEnd( $uarg );
 399
 400                 // parse a limited subset of wiki markup (just the single quote items)
 401                 $text = $parser->doQuotes( $text );
 402
 403                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 404                 $text = $parser->killMarkers( $text );
 405
 406                 // list of disallowed tags for DISPLAYTITLE
 407                 // these will be escaped even though they are allowed in normal wiki text
 408                 $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 409                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];
 410
 411                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 412                 if ( $wgRestrictDisplayTitle ) {
 413                         $htmlTagsCallback = function ( &$params ) {
 414                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 415
 416                                 if ( isset( $decoded['style'] ) ) {
 417                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 418                                         // calling it twice doesn't hurt
 419                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 420
 421                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 422                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 423                                         }
 424                                 }
 425
 426                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 427                         };
 428                 } else {
 429                         $htmlTagsCallback = null;
 430                 }
 431
 432                 // only requested titles that normalize to the actual title are allowed through
 433                 // if $wgRestrictDisplayTitle is true (it is by default)
 434                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 435                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 436                         $text,
 437                         $htmlTagsCallback,
 438                         [],
 439                         [],
 440                         $bad
 441                 ) );
 442                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 443
 444                 if ( !$wgRestrictDisplayTitle ||
 445                         ( $title instanceof Title
 446                         && !$title->hasFragment()
 447                         && $title->equals( $parser->mTitle ) )
 448                 ) {
 449                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 450                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 451                                 $parser->mOutput->setDisplayTitle( $text );
 452                         }
 453                         if ( $old !== false && $old !== $text && !$arg ) {
 454                                 $converter = $parser->getTargetLanguage()->getConverter();
 455                                 return '<span class="error">' .
 456                                         wfMessage( 'duplicate-displaytitle',
 457                                                 // Message should be parsed, but these params should only be escaped.
 458                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 459                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 460                                         )->inContentLanguage()->text() .
 461                                         '</span>';
 462                         } else {
 463                                 return '';
 464                         }
 465                 } else {
 466                         $converter = $parser->getTargetLanguage()->getConverter();
 467                         $parser->getOutput()->addWarning(
 468                                 wfMessage( 'restricted-displaytitle',
 469                                         // Message should be parsed, but this param should only be escaped.
 470                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 471                                 )->text()
 472                         );
 473                         $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
 474                 }
 475         }
 476
 477         /**
 478          * Matches the given value against the value of given magic word
 479          *
 480          * @param MagicWordFactory $magicWordFactory A factory to get the word from, e.g., from
 481          *   $parser->getMagicWordFactory()
 482          * @param string $magicword Magic word key
 483          * @param string $value Value to match
 484          * @return bool True on successful match
 485          */
 486         private static function matchAgainstMagicword(
 487                 MagicWordFactory $magicWordFactory, $magicword, $value
 488         ) {
 489                 $value = trim( strval( $value ) );
 490                 if ( $value === '' ) {
 491                         return false;
 492                 }
 493                 $mwObject = $magicWordFactory->get( $magicword );
 494                 return $mwObject->matchStartToEnd( $value );
 495         }
 496
 497         /**
 498          * Formats a number according to a language.
 499          *
 500          * @param int|float $num
 501          * @param string $raw
 502          * @param Language|StubUserLang $language
 503          * @param MagicWordFactory|null $magicWordFactory To evaluate $raw
 504          * @return string
 505          */
 506         public static function formatRaw(
 507                 $num, $raw, $language, MagicWordFactory $magicWordFactory = null
 508         ) {
 509                 if ( $raw !== null && !$magicWordFactory ) {
 510                         $magicWordFactory = MediaWikiServices::getInstance()->getMagicWordFactory();
 511                 }
 512                 if (
 513                         $raw !== null && self::matchAgainstMagicword( $magicWordFactory, 'rawsuffix', $raw )
 514                 ) {
 515                         return $num;
 516                 } else {
 517                         return $language->formatNum( $num );
 518                 }
 519         }
 520
 521         public static function numberofpages( $parser, $raw = null ) {
 522                 return self::formatRaw( SiteStats::pages(), $raw, $parser->getFunctionLang() );
 523         }
 524
 525         public static function numberofusers( $parser, $raw = null ) {
 526                 return self::formatRaw( SiteStats::users(), $raw, $parser->getFunctionLang() );
 527         }
 528         public static function numberofactiveusers( $parser, $raw = null ) {
 529                 return self::formatRaw( SiteStats::activeUsers(), $raw, $parser->getFunctionLang() );
 530         }
 531
 532         public static function numberofarticles( $parser, $raw = null ) {
 533                 return self::formatRaw( SiteStats::articles(), $raw, $parser->getFunctionLang() );
 534         }
 535
 536         public static function numberoffiles( $parser, $raw = null ) {
 537                 return self::formatRaw( SiteStats::images(), $raw, $parser->getFunctionLang() );
 538         }
 539
 540         public static function numberofadmins( $parser, $raw = null ) {
 541                 return self::formatRaw(
 542                         SiteStats::numberingroup( 'sysop' ),
 543                         $raw,
 544                         $parser->getFunctionLang()
 545                 );
 546         }
 547
 548         public static function numberofedits( $parser, $raw = null ) {
 549                 return self::formatRaw( SiteStats::edits(), $raw, $parser->getFunctionLang() );
 550         }
 551
 552         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 553                 return self::formatRaw(
 554                         SiteStats::pagesInNs( intval( $namespace ) ),
 555                         $raw,
 556                         $parser->getFunctionLang()
 557                 );
 558         }
 559         public static function numberingroup( $parser, $name = '', $raw = null ) {
 560                 return self::formatRaw(
 561                         SiteStats::numberingroup( strtolower( $name ) ),
 562                         $raw,
 563                         $parser->getFunctionLang()
 564                 );
 565         }
 566
 567         /**
 568          * Given a title, return the namespace name that would be given by the
 569          * corresponding magic word
 570          * Note: function name changed to "mwnamespace" rather than "namespace"
 571          * to not break PHP 5.3
 572          * @param Parser $parser
 573          * @param string|null $title
 574          * @return mixed|string
 575          */
 576         public static function mwnamespace( $parser, $title = null ) {
 577                 $t = Title::newFromText( $title );
 578                 if ( is_null( $t ) ) {
 579                         return '';
 580                 }
 581                 return str_replace( '_', ' ', $t->getNsText() );
 582         }
 583         public static function namespacee( $parser, $title = null ) {
 584                 $t = Title::newFromText( $title );
 585                 if ( is_null( $t ) ) {
 586                         return '';
 587                 }
 588                 return wfUrlencode( $t->getNsText() );
 589         }
 590         public static function namespacenumber( $parser, $title = null ) {
 591                 $t = Title::newFromText( $title );
 592                 if ( is_null( $t ) ) {
 593                         return '';
 594                 }
 595                 return $t->getNamespace();
 596         }
 597         public static function talkspace( $parser, $title = null ) {
 598                 $t = Title::newFromText( $title );
 599                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 600                         return '';
 601                 }
 602                 return str_replace( '_', ' ', $t->getTalkNsText() );
 603         }
 604         public static function talkspacee( $parser, $title = null ) {
 605                 $t = Title::newFromText( $title );
 606                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 607                         return '';
 608                 }
 609                 return wfUrlencode( $t->getTalkNsText() );
 610         }
 611         public static function subjectspace( $parser, $title = null ) {
 612                 $t = Title::newFromText( $title );
 613                 if ( is_null( $t ) ) {
 614                         return '';
 615                 }
 616                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 617         }
 618         public static function subjectspacee( $parser, $title = null ) {
 619                 $t = Title::newFromText( $title );
 620                 if ( is_null( $t ) ) {
 621                         return '';
 622                 }
 623                 return wfUrlencode( $t->getSubjectNsText() );
 624         }
 625
 626         /**
 627          * Functions to get and normalize pagenames, corresponding to the magic words
 628          * of the same names
 629          * @param Parser $parser
 630          * @param string|null $title
 631          * @return string
 632          */
 633         public static function pagename( $parser, $title = null ) {
 634                 $t = Title::newFromText( $title );
 635                 if ( is_null( $t ) ) {
 636                         return '';
 637                 }
 638                 return wfEscapeWikiText( $t->getText() );
 639         }
 640         public static function pagenamee( $parser, $title = null ) {
 641                 $t = Title::newFromText( $title );
 642                 if ( is_null( $t ) ) {
 643                         return '';
 644                 }
 645                 return wfEscapeWikiText( $t->getPartialURL() );
 646         }
 647         public static function fullpagename( $parser, $title = null ) {
 648                 $t = Title::newFromText( $title );
 649                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 650                         return '';
 651                 }
 652                 return wfEscapeWikiText( $t->getPrefixedText() );
 653         }
 654         public static function fullpagenamee( $parser, $title = null ) {
 655                 $t = Title::newFromText( $title );
 656                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 657                         return '';
 658                 }
 659                 return wfEscapeWikiText( $t->getPrefixedURL() );
 660         }
 661         public static function subpagename( $parser, $title = null ) {
 662                 $t = Title::newFromText( $title );
 663                 if ( is_null( $t ) ) {
 664                         return '';
 665                 }
 666                 return wfEscapeWikiText( $t->getSubpageText() );
 667         }
 668         public static function subpagenamee( $parser, $title = null ) {
 669                 $t = Title::newFromText( $title );
 670                 if ( is_null( $t ) ) {
 671                         return '';
 672                 }
 673                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 674         }
 675         public static function rootpagename( $parser, $title = null ) {
 676                 $t = Title::newFromText( $title );
 677                 if ( is_null( $t ) ) {
 678                         return '';
 679                 }
 680                 return wfEscapeWikiText( $t->getRootText() );
 681         }
 682         public static function rootpagenamee( $parser, $title = null ) {
 683                 $t = Title::newFromText( $title );
 684                 if ( is_null( $t ) ) {
 685                         return '';
 686                 }
 687                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
 688         }
 689         public static function basepagename( $parser, $title = null ) {
 690                 $t = Title::newFromText( $title );
 691                 if ( is_null( $t ) ) {
 692                         return '';
 693                 }
 694                 return wfEscapeWikiText( $t->getBaseText() );
 695         }
 696         public static function basepagenamee( $parser, $title = null ) {
 697                 $t = Title::newFromText( $title );
 698                 if ( is_null( $t ) ) {
 699                         return '';
 700                 }
 701                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 702         }
 703         public static function talkpagename( $parser, $title = null ) {
 704                 $t = Title::newFromText( $title );
 705                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 706                         return '';
 707                 }
 708                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 709         }
 710         public static function talkpagenamee( $parser, $title = null ) {
 711                 $t = Title::newFromText( $title );
 712                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 713                         return '';
 714                 }
 715                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 716         }
 717         public static function subjectpagename( $parser, $title = null ) {
 718                 $t = Title::newFromText( $title );
 719                 if ( is_null( $t ) ) {
 720                         return '';
 721                 }
 722                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 723         }
 724         public static function subjectpagenamee( $parser, $title = null ) {
 725                 $t = Title::newFromText( $title );
 726                 if ( is_null( $t ) ) {
 727                         return '';
 728                 }
 729                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 730         }
 731
 732         /**
 733          * Return the number of pages, files or subcats in the given category,
 734          * or 0 if it's nonexistent. This is an expensive parser function and
 735          * can't be called too many times per page.
 736          * @param Parser $parser
 737          * @param string $name
 738          * @param string|null $arg1
 739          * @param string|null $arg2
 740          * @return string
 741          */
 742         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 743                 global $wgContLang;
 744                 static $magicWords = null;
 745                 if ( is_null( $magicWords ) ) {
 746                         $magicWords = new MagicWordArray( [
 747                                 'pagesincategory_all',
 748                                 'pagesincategory_pages',
 749                                 'pagesincategory_subcats',
 750                                 'pagesincategory_files'
 751                         ] );
 752                 }
 753                 static $cache = [];
 754
 755                 // split the given option to its variable
 756                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg1 ) ) {
 757                         // {{pagesincategory:|raw[|type]}}
 758                         $raw = $arg1;
 759                         $type = $magicWords->matchStartToEnd( $arg2 );
 760                 } else {
 761                         // {{pagesincategory:[|type[|raw]]}}
 762                         $type = $magicWords->matchStartToEnd( $arg1 );
 763                         $raw = $arg2;
 764                 }
 765                 if ( !$type ) { // backward compatibility
 766                         $type = 'pagesincategory_all';
 767                 }
 768
 769                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 770                 if ( !$title ) { # invalid title
 771                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 772                 }
 773                 $wgContLang->findVariantLink( $name, $title, true );
 774
 775                 // Normalize name for cache
 776                 $name = $title->getDBkey();
 777
 778                 if ( !isset( $cache[$name] ) ) {
 779                         $category = Category::newFromTitle( $title );
 780
 781                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 782                         if ( $parser->incrementExpensiveFunctionCount() ) {
 783                                 // $allCount is the total number of cat members,
 784                                 // not the count of how many members are normal pages.
 785                                 $allCount = (int)$category->getPageCount();
 786                                 $subcatCount = (int)$category->getSubcatCount();
 787                                 $fileCount = (int)$category->getFileCount();
 788                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 789                         }
 790                         $cache[$name]['pagesincategory_all'] = $allCount;
 791                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 792                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 793                         $cache[$name]['pagesincategory_files'] = $fileCount;
 794                 }
 795
 796                 $count = $cache[$name][$type];
 797                 return self::formatRaw( $count, $raw, $parser->getFunctionLang() );
 798         }
 799
 800         /**
 801          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 802          * expensive parser function and can't be called too many times per page.
 803          *
 804          * @param Parser $parser
 805          * @param string $page Name of page to check (Default: empty string)
 806          * @param string|null $raw Should number be human readable with commas or just number
 807          * @return string
 808          */
 809         public static function pagesize( $parser, $page = '', $raw = null ) {
 810                 $title = Title::newFromText( $page );
 811
 812                 if ( !is_object( $title ) ) {
 813                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 814                 }
 815
 816                 // fetch revision from cache/database and return the value
 817                 $rev = self::getCachedRevisionObject( $parser, $title );
 818                 $length = $rev ? $rev->getSize() : 0;
 819                 if ( $length === null ) {
 820                         // We've had bugs where rev_len was not being recorded for empty pages, see T135414
 821                         $length = 0;
 822                 }
 823                 return self::formatRaw( $length, $raw, $parser->getFunctionLang() );
 824         }
 825
 826         /**
 827          * Returns the requested protection level for the current page. This
 828          * is an expensive parser function and can't be called too many times
 829          * per page, unless the protection levels/expiries for the given title
 830          * have already been retrieved
 831          *
 832          * @param Parser $parser
 833          * @param string $type
 834          * @param string $title
 835          *
 836          * @return string
 837          */
 838         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 839                 $titleObject = Title::newFromText( $title );
 840                 if ( !( $titleObject instanceof Title ) ) {
 841                         $titleObject = $parser->mTitle;
 842                 }
 843                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 844                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 845                         # Title::getRestrictions returns an array, its possible it may have
 846                         # multiple values in the future
 847                         return implode( ',', $restrictions );
 848                 }
 849                 return '';
 850         }
 851
 852         /**
 853          * Returns the requested protection expiry for the current page. This
 854          * is an expensive parser function and can't be called too many times
 855          * per page, unless the protection levels/expiries for the given title
 856          * have already been retrieved
 857          *
 858          * @param Parser $parser
 859          * @param string $type
 860          * @param string $title
 861          *
 862          * @return string
 863          */
 864         public static function protectionexpiry( $parser, $type = '', $title = '' ) {
 865                 $titleObject = Title::newFromText( $title );
 866                 if ( !( $titleObject instanceof Title ) ) {
 867                         $titleObject = $parser->mTitle;
 868                 }
 869                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 870                         $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
 871                         // getRestrictionExpiry() returns false on invalid type; trying to
 872                         // match protectionlevel() function that returns empty string instead
 873                         if ( $expiry === false ) {
 874                                 $expiry = '';
 875                         }
 876                         return $expiry;
 877                 }
 878                 return '';
 879         }
 880
 881         /**
 882          * Gives language names.
 883          * @param Parser $parser
 884          * @param string $code Language code (of which to get name)
 885          * @param string $inLanguage Language code (in which to get name)
 886          * @return string
 887          */
 888         public static function language( $parser, $code = '', $inLanguage = '' ) {
 889                 $code = strtolower( $code );
 890                 $inLanguage = strtolower( $inLanguage );
 891                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 892                 return $lang !== '' ? $lang : LanguageCode::bcp47( $code );
 893         }
 894
 895         /**
 896          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 897          * @param Parser $parser
 898          * @param string $string
 899          * @param string $length
 900          * @param string $padding
 901          * @param int $direction
 902          * @return string
 903          */
 904         public static function pad(
 905                 $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
 906         ) {
 907                 $padding = $parser->killMarkers( $padding );
 908                 $lengthOfPadding = mb_strlen( $padding );
 909                 if ( $lengthOfPadding == 0 ) {
 910                         return $string;
 911                 }
 912
 913                 # The remaining length to add counts down to 0 as padding is added
 914                 $length = min( (int)$length, 500 ) - mb_strlen( $string );
 915                 if ( $length <= 0 ) {
 916                         // Nothing to add
 917                         return $string;
 918                 }
 919
 920                 # $finalPadding is just $padding repeated enough times so that
 921                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 922                 $finalPadding = '';
 923                 while ( $length > 0 ) {
 924                         # If $length < $lengthofPadding, truncate $padding so we get the
 925                         # exact length desired.
 926                         $finalPadding .= mb_substr( $padding, 0, $length );
 927                         $length -= $lengthOfPadding;
 928                 }
 929
 930                 if ( $direction == STR_PAD_LEFT ) {
 931                         return $finalPadding . $string;
 932                 } else {
 933                         return $string . $finalPadding;
 934                 }
 935         }
 936
 937         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 938                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 939         }
 940
 941         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 942                 return self::pad( $parser, $string, $length, $padding );
 943         }
 944
 945         /**
 946          * @param Parser $parser
 947          * @param string $text
 948          * @return string
 949          */
 950         public static function anchorencode( $parser, $text ) {
 951                 $text = $parser->killMarkers( $text );
 952                 $section = (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 953                 return Sanitizer::safeEncodeAttribute( $section );
 954         }
 955
 956         public static function special( $parser, $text ) {
 957                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 958                 if ( $page ) {
 959                         $title = SpecialPage::getTitleFor( $page, $subpage );
 960                         return $title->getPrefixedText();
 961                 } else {
 962                         // unknown special page, just use the given text as its title, if at all possible
 963                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 964                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 965                 }
 966         }
 967
 968         public static function speciale( $parser, $text ) {
 969                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 970         }
 971
 972         /**
 973          * @param Parser $parser
 974          * @param string $text The sortkey to use
 975          * @param string $uarg Either "noreplace" or "noerror" (in en)
 976          *   both suppress errors, and noreplace does nothing if
 977          *   a default sortkey already exists.
 978          * @return string
 979          */
 980         public static function defaultsort( $parser, $text, $uarg = '' ) {
 981                 static $magicWords = null;
 982                 if ( is_null( $magicWords ) ) {
 983                         $magicWords = new MagicWordArray( [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
 984                 }
 985                 $arg = $magicWords->matchStartToEnd( $uarg );
 986
 987                 $text = trim( $text );
 988                 if ( strlen( $text ) == 0 ) {
 989                         return '';
 990                 }
 991                 $old = $parser->getCustomDefaultSort();
 992                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 993                         $parser->setDefaultSort( $text );
 994                 }
 995
 996                 if ( $old === false || $old == $text || $arg ) {
 997                         return '';
 998                 } else {
 999                         $converter = $parser->getTargetLanguage()->getConverter();
1000                         return '<span class="error">' .
1001                                 wfMessage( 'duplicate-defaultsort',
1002                                         // Message should be parsed, but these params should only be escaped.
1003                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
1004                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
1005                                 )->inContentLanguage()->text() .
1006                                 '</span>';
1007                 }
1008         }
1009
1010         /**
1011          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
1012          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
1013          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
1014          *
1015          * @param Parser $parser
1016          * @param string $name
1017          * @param string $argA
1018          * @param string $argB
1019          * @return array|string
1020          */
1021         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
1022                 $file = wfFindFile( $name );
1023
1024                 if ( $argA == 'nowiki' ) {
1025                         // {{filepath: | option [| size] }}
1026                         $isNowiki = true;
1027                         $parsedWidthParam = Parser::parseWidthParam( $argB );
1028                 } else {
1029                         // {{filepath: [| size [|option]] }}
1030                         $parsedWidthParam = Parser::parseWidthParam( $argA );
1031                         $isNowiki = ( $argB == 'nowiki' );
1032                 }
1033
1034                 if ( $file ) {
1035                         $url = $file->getFullUrl();
1036
1037                         // If a size is requested...
1038                         if ( count( $parsedWidthParam ) ) {
1039                                 $mto = $file->transform( $parsedWidthParam );
1040                                 // ... and we can
1041                                 if ( $mto && !$mto->isError() ) {
1042                                         // ... change the URL to point to a thumbnail.
1043                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
1044                                 }
1045                         }
1046                         if ( $isNowiki ) {
1047                                 return [ $url, 'nowiki' => true ];
1048                         }
1049                         return $url;
1050                 } else {
1051                         return '';
1052                 }
1053         }
1054
1055         /**
1056          * Parser function to extension tag adaptor
1057          * @param Parser $parser
1058          * @param PPFrame $frame
1059          * @param PPNode[] $args
1060          * @return string
1061          */
1062         public static function tagObj( $parser, $frame, $args ) {
1063                 if ( !count( $args ) ) {
1064                         return '';
1065                 }
1066                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
1067
1068                 if ( count( $args ) ) {
1069                         $inner = $frame->expand( array_shift( $args ) );
1070                 } else {
1071                         $inner = null;
1072                 }
1073
1074                 $attributes = [];
1075                 foreach ( $args as $arg ) {
1076                         $bits = $arg->splitArg();
1077                         if ( strval( $bits['index'] ) === '' ) {
1078                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1079                                 $value = trim( $frame->expand( $bits['value'] ) );
1080                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
1081                                         $value = $m[1] ?? '';
1082                                 }
1083                                 $attributes[$name] = $value;
1084                         }
1085                 }
1086
1087                 $stripList = $parser->getStripList();
1088                 if ( !in_array( $tagName, $stripList ) ) {
1089                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
1090                         $attrText = '';
1091                         foreach ( $attributes as $name => $value ) {
1092                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
1093                         }
1094                         if ( $inner === null ) {
1095                                 return "<$tagName$attrText/>";
1096                         }
1097                         return "<$tagName$attrText>$inner</$tagName>";
1098                 }
1099
1100                 $params = [
1101                         'name' => $tagName,
1102                         'inner' => $inner,
1103                         'attributes' => $attributes,
1104                         'close' => "</$tagName>",
1105                 ];
1106                 return $parser->extensionSubstitution( $params, $frame );
1107         }
1108
1109         /**
1110          * Fetched the current revision of the given title and return this.
1111          * Will increment the expensive function count and
1112          * add a template link to get the value refreshed on changes.
1113          * For a given title, which is equal to the current parser title,
1114          * the revision object from the parser is used, when that is the current one
1115          *
1116          * @param Parser $parser
1117          * @param Title $title
1118          * @return Revision
1119          * @since 1.23
1120          */
1121         private static function getCachedRevisionObject( $parser, $title = null ) {
1122                 if ( is_null( $title ) ) {
1123                         return null;
1124                 }
1125
1126                 // Use the revision from the parser itself, when param is the current page
1127                 // and the revision is the current one
1128                 if ( $title->equals( $parser->getTitle() ) ) {
1129                         $parserRev = $parser->getRevisionObject();
1130                         if ( $parserRev && $parserRev->isCurrent() ) {
1131                                 // force reparse after edit with vary-revision flag
1132                                 $parser->getOutput()->setFlag( 'vary-revision' );
1133                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1134                                 return $parserRev;
1135                         }
1136                 }
1137
1138                 // Normalize name for cache
1139                 $page = $title->getPrefixedDBkey();
1140
1141                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1142                         && !$parser->incrementExpensiveFunctionCount() ) {
1143                         return null;
1144                 }
1145                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1146                 $pageID = $rev ? $rev->getPage() : 0;
1147                 $revID = $rev ? $rev->getId() : 0;
1148
1149                 // Register dependency in templatelinks
1150                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1151
1152                 return $rev;
1153         }
1154
1155         /**
1156          * Get the pageid of a specified page
1157          * @param Parser $parser
1158          * @param string|null $title Title to get the pageid from
1159          * @return int|null|string
1160          * @since 1.23
1161          */
1162         public static function pageid( $parser, $title = null ) {
1163                 $t = Title::newFromText( $title );
1164                 if ( is_null( $t ) ) {
1165                         return '';
1166                 }
1167                 // Use title from parser to have correct pageid after edit
1168                 if ( $t->equals( $parser->getTitle() ) ) {
1169                         $t = $parser->getTitle();
1170                         return $t->getArticleID();
1171                 }
1172
1173                 // These can't have ids
1174                 if ( !$t->canExist() || $t->isExternal() ) {
1175                         return 0;
1176                 }
1177
1178                 // Check the link cache, maybe something already looked it up.
1179                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1180                 $pdbk = $t->getPrefixedDBkey();
1181                 $id = $linkCache->getGoodLinkID( $pdbk );
1182                 if ( $id != 0 ) {
1183                         $parser->mOutput->addLink( $t, $id );
1184                         return $id;
1185                 }
1186                 if ( $linkCache->isBadLink( $pdbk ) ) {
1187                         $parser->mOutput->addLink( $t, 0 );
1188                         return $id;
1189                 }
1190
1191                 // We need to load it from the DB, so mark expensive
1192                 if ( $parser->incrementExpensiveFunctionCount() ) {
1193                         $id = $t->getArticleID();
1194                         $parser->mOutput->addLink( $t, $id );
1195                         return $id;
1196                 }
1197                 return null;
1198         }
1199
1200         /**
1201          * Get the id from the last revision of a specified page.
1202          * @param Parser $parser
1203          * @param string|null $title Title to get the id from
1204          * @return int|null|string
1205          * @since 1.23
1206          */
1207         public static function revisionid( $parser, $title = null ) {
1208                 $t = Title::newFromText( $title );
1209                 if ( is_null( $t ) ) {
1210                         return '';
1211                 }
1212                 // fetch revision from cache/database and return the value
1213                 $rev = self::getCachedRevisionObject( $parser, $t );
1214                 return $rev ? $rev->getId() : '';
1215         }
1216
1217         /**
1218          * Get the day from the last revision of a specified page.
1219          * @param Parser $parser
1220          * @param string|null $title Title to get the day from
1221          * @return string
1222          * @since 1.23
1223          */
1224         public static function revisionday( $parser, $title = null ) {
1225                 $t = Title::newFromText( $title );
1226                 if ( is_null( $t ) ) {
1227                         return '';
1228                 }
1229                 // fetch revision from cache/database and return the value
1230                 $rev = self::getCachedRevisionObject( $parser, $t );
1231                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1232         }
1233
1234         /**
1235          * Get the day with leading zeros from the last revision of a specified page.
1236          * @param Parser $parser
1237          * @param string|null $title Title to get the day from
1238          * @return string
1239          * @since 1.23
1240          */
1241         public static function revisionday2( $parser, $title = null ) {
1242                 $t = Title::newFromText( $title );
1243                 if ( is_null( $t ) ) {
1244                         return '';
1245                 }
1246                 // fetch revision from cache/database and return the value
1247                 $rev = self::getCachedRevisionObject( $parser, $t );
1248                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1249         }
1250
1251         /**
1252          * Get the month with leading zeros from the last revision of a specified page.
1253          * @param Parser $parser
1254          * @param string|null $title Title to get the month from
1255          * @return string
1256          * @since 1.23
1257          */
1258         public static function revisionmonth( $parser, $title = null ) {
1259                 $t = Title::newFromText( $title );
1260                 if ( is_null( $t ) ) {
1261                         return '';
1262                 }
1263                 // fetch revision from cache/database and return the value
1264                 $rev = self::getCachedRevisionObject( $parser, $t );
1265                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1266         }
1267
1268         /**
1269          * Get the month from the last revision of a specified page.
1270          * @param Parser $parser
1271          * @param string|null $title Title to get the month from
1272          * @return string
1273          * @since 1.23
1274          */
1275         public static function revisionmonth1( $parser, $title = null ) {
1276                 $t = Title::newFromText( $title );
1277                 if ( is_null( $t ) ) {
1278                         return '';
1279                 }
1280                 // fetch revision from cache/database and return the value
1281                 $rev = self::getCachedRevisionObject( $parser, $t );
1282                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1283         }
1284
1285         /**
1286          * Get the year from the last revision of a specified page.
1287          * @param Parser $parser
1288          * @param string|null $title Title to get the year from
1289          * @return string
1290          * @since 1.23
1291          */
1292         public static function revisionyear( $parser, $title = null ) {
1293                 $t = Title::newFromText( $title );
1294                 if ( is_null( $t ) ) {
1295                         return '';
1296                 }
1297                 // fetch revision from cache/database and return the value
1298                 $rev = self::getCachedRevisionObject( $parser, $t );
1299                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1300         }
1301
1302         /**
1303          * Get the timestamp from the last revision of a specified page.
1304          * @param Parser $parser
1305          * @param string|null $title Title to get the timestamp from
1306          * @return string
1307          * @since 1.23
1308          */
1309         public static function revisiontimestamp( $parser, $title = null ) {
1310                 $t = Title::newFromText( $title );
1311                 if ( is_null( $t ) ) {
1312                         return '';
1313                 }
1314                 // fetch revision from cache/database and return the value
1315                 $rev = self::getCachedRevisionObject( $parser, $t );
1316                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1317         }
1318
1319         /**
1320          * Get the user from the last revision of a specified page.
1321          * @param Parser $parser
1322          * @param string|null $title Title to get the user from
1323          * @return string
1324          * @since 1.23
1325          */
1326         public static function revisionuser( $parser, $title = null ) {
1327                 $t = Title::newFromText( $title );
1328                 if ( is_null( $t ) ) {
1329                         return '';
1330                 }
1331                 // fetch revision from cache/database and return the value
1332                 $rev = self::getCachedRevisionObject( $parser, $t );
1333                 return $rev ? $rev->getUserText() : '';
1334         }
1335
1336         /**
1337          * Returns the sources of any cascading protection acting on a specified page.
1338          * Pages will not return their own title unless they transclude themselves.
1339          * This is an expensive parser function and can't be called too many times per page,
1340          * unless cascading protection sources for the page have already been loaded.
1341          *
1342          * @param Parser $parser
1343          * @param string $title
1344          *
1345          * @return string
1346          * @since 1.23
1347          */
1348         public static function cascadingsources( $parser, $title = '' ) {
1349                 $titleObject = Title::newFromText( $title );
1350                 if ( !( $titleObject instanceof Title ) ) {
1351                         $titleObject = $parser->mTitle;
1352                 }
1353                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1354                         || $parser->incrementExpensiveFunctionCount()
1355                 ) {
1356                         $names = [];
1357                         $sources = $titleObject->getCascadeProtectionSources();
1358                         foreach ( $sources[0] as $sourceTitle ) {
1359                                 $names[] = $sourceTitle->getPrefixedText();
1360                         }
1361                         return implode( '|', $names );
1362                 }
1363                 return '';
1364         }
1365
1366 }