includes/parser/CoreParserFunctions.php

   1 <?php
   2 /**
   3  * Parser functions provided by MediaWiki core
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Parser
  22  */
  23 use MediaWiki\MediaWikiServices;
  24
  25 /**
  26  * Various core parser functions, registered in Parser::firstCallInit()
  27  * @ingroup Parser
  28  */
  29 class CoreParserFunctions {
  30         /**
  31          * @param Parser $parser
  32          * @return void
  33          */
  34         public static function register( $parser ) {
  35                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  36
  37                 # Syntax for arguments (see Parser::setFunctionHook):
  38                 #  "name for lookup in localized magic words array",
  39                 #  function callback,
  40                 #  optional Parser::SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}}
  41                 #    instead of {{#int:...}})
  42                 $noHashFunctions = [
  43                         'ns', 'nse', 'urlencode', 'lcfirst', 'ucfirst', 'lc', 'uc',
  44                         'localurl', 'localurle', 'fullurl', 'fullurle', 'canonicalurl',
  45                         'canonicalurle', 'formatnum', 'grammar', 'gender', 'plural', 'bidi',
  46                         'numberofpages', 'numberofusers', 'numberofactiveusers',
  47                         'numberofarticles', 'numberoffiles', 'numberofadmins',
  48                         'numberingroup', 'numberofedits', 'language',
  49                         'padleft', 'padright', 'anchorencode', 'defaultsort', 'filepath',
  50                         'pagesincategory', 'pagesize', 'protectionlevel', 'protectionexpiry',
  51                         'namespacee', 'namespacenumber', 'talkspace', 'talkspacee',
  52                         'subjectspace', 'subjectspacee', 'pagename', 'pagenamee',
  53                         'fullpagename', 'fullpagenamee', 'rootpagename', 'rootpagenamee',
  54                         'basepagename', 'basepagenamee', 'subpagename', 'subpagenamee',
  55                         'talkpagename', 'talkpagenamee', 'subjectpagename',
  56                         'subjectpagenamee', 'pageid', 'revisionid', 'revisionday',
  57                         'revisionday2', 'revisionmonth', 'revisionmonth1', 'revisionyear',
  58                         'revisiontimestamp', 'revisionuser', 'cascadingsources',
  59                 ];
  60                 foreach ( $noHashFunctions as $func ) {
  61                         $parser->setFunctionHook( $func, [ __CLASS__, $func ], Parser::SFH_NO_HASH );
  62                 }
  63
  64                 $parser->setFunctionHook(
  65                         'namespace',
  66                         [ __CLASS__, 'mwnamespace' ],
  67                         Parser::SFH_NO_HASH
  68                 );
  69                 $parser->setFunctionHook( 'int', [ __CLASS__, 'intFunction' ], Parser::SFH_NO_HASH );
  70                 $parser->setFunctionHook( 'special', [ __CLASS__, 'special' ] );
  71                 $parser->setFunctionHook( 'speciale', [ __CLASS__, 'speciale' ] );
  72                 $parser->setFunctionHook( 'tag', [ __CLASS__, 'tagObj' ], Parser::SFH_OBJECT_ARGS );
  73                 $parser->setFunctionHook( 'formatdate', [ __CLASS__, 'formatDate' ] );
  74
  75                 if ( $wgAllowDisplayTitle ) {
  76                         $parser->setFunctionHook(
  77                                 'displaytitle',
  78                                 [ __CLASS__, 'displaytitle' ],
  79                                 Parser::SFH_NO_HASH
  80                         );
  81                 }
  82                 if ( $wgAllowSlowParserFunctions ) {
  83                         $parser->setFunctionHook(
  84                                 'pagesinnamespace',
  85                                 [ __CLASS__, 'pagesinnamespace' ],
  86                                 Parser::SFH_NO_HASH
  87                         );
  88                 }
  89         }
  90
  91         /**
  92          * @param Parser $parser
  93          * @param string $part1 Message key
  94          * @param mixed ...$params To pass to wfMessage()
  95          * @return array
  96          */
  97         public static function intFunction( $parser, $part1 = '', ...$params ) {
  98                 if ( strval( $part1 ) !== '' ) {
  99                         $message = wfMessage( $part1, $params )
 100                                 ->inLanguage( $parser->getOptions()->getUserLangObj() );
 101                         return [ $message->plain(), 'noparse' => false ];
 102                 } else {
 103                         return [ 'found' => false ];
 104                 }
 105         }
 106
 107         /**
 108          * @param Parser $parser
 109          * @param string $date
 110          * @param string|null $defaultPref
 111          *
 112          * @return string
 113          */
 114         public static function formatDate( $parser, $date, $defaultPref = null ) {
 115                 $lang = $parser->getFunctionLang();
 116                 $df = MediaWikiServices::getInstance()->getDateFormatterFactory()->get( $lang );
 117
 118                 $date = trim( $date );
 119
 120                 $pref = $parser->getOptions()->getDateFormat();
 121
 122                 // Specify a different default date format other than the normal default
 123                 // if the user has 'default' for their setting
 124                 if ( $pref == 'default' && $defaultPref ) {
 125                         $pref = $defaultPref;
 126                 }
 127
 128                 $date = $df->reformat( $pref, $date, [ 'match-whole' ] );
 129                 return $date;
 130         }
 131
 132         public static function ns( $parser, $part1 = '' ) {
 133                 if ( intval( $part1 ) || $part1 == "0" ) {
 134                         $index = intval( $part1 );
 135                 } else {
 136                         $index = $parser->getContentLanguage()->getNsIndex( str_replace( ' ', '_', $part1 ) );
 137                 }
 138                 if ( $index !== false ) {
 139                         return $parser->getContentLanguage()->getFormattedNsText( $index );
 140                 } else {
 141                         return [ 'found' => false ];
 142                 }
 143         }
 144
 145         public static function nse( $parser, $part1 = '' ) {
 146                 $ret = self::ns( $parser, $part1 );
 147                 if ( is_string( $ret ) ) {
 148                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 149                 }
 150                 return $ret;
 151         }
 152
 153         /**
 154          * urlencodes a string according to one of three patterns: (T24474)
 155          *
 156          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 157          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 158          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 159          *
 160          * @param Parser $parser
 161          * @param string $s The text to encode.
 162          * @param string|null $arg (optional): The type of encoding.
 163          * @return string
 164          */
 165         public static function urlencode( $parser, $s = '', $arg = null ) {
 166                 static $magicWords = null;
 167                 if ( is_null( $magicWords ) ) {
 168                         $magicWords =
 169                                 $parser->getMagicWordFactory()->newArray( [ 'url_path', 'url_query', 'url_wiki' ] );
 170                 }
 171                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 172                         // Encode as though it's a wiki page, '_' for ' '.
 173                         case 'url_wiki':
 174                                 $func = 'wfUrlencode';
 175                                 $s = str_replace( ' ', '_', $s );
 176                                 break;
 177
 178                         // Encode for an HTTP Path, '%20' for ' '.
 179                         case 'url_path':
 180                                 $func = 'rawurlencode';
 181                                 break;
 182
 183                         // Encode for HTTP query, '+' for ' '.
 184                         case 'url_query':
 185                         default:
 186                                 $func = 'urlencode';
 187                 }
 188                 // See T105242, where the choice to kill markers and various
 189                 // other options were discussed.
 190                 return $func( $parser->killMarkers( $s ) );
 191         }
 192
 193         public static function lcfirst( $parser, $s = '' ) {
 194                 return $parser->getContentLanguage()->lcfirst( $s );
 195         }
 196
 197         public static function ucfirst( $parser, $s = '' ) {
 198                 return $parser->getContentLanguage()->ucfirst( $s );
 199         }
 200
 201         /**
 202          * @param Parser $parser
 203          * @param string $s
 204          * @return string
 205          */
 206         public static function lc( $parser, $s = '' ) {
 207                 return $parser->markerSkipCallback( $s, [ $parser->getContentLanguage(), 'lc' ] );
 208         }
 209
 210         /**
 211          * @param Parser $parser
 212          * @param string $s
 213          * @return string
 214          */
 215         public static function uc( $parser, $s = '' ) {
 216                 return $parser->markerSkipCallback( $s, [ $parser->getContentLanguage(), 'uc' ] );
 217         }
 218
 219         public static function localurl( $parser, $s = '', $arg = null ) {
 220                 return self::urlFunction( 'getLocalURL', $s, $arg );
 221         }
 222
 223         public static function localurle( $parser, $s = '', $arg = null ) {
 224                 $temp = self::urlFunction( 'getLocalURL', $s, $arg );
 225                 if ( !is_string( $temp ) ) {
 226                         return $temp;
 227                 } else {
 228                         return htmlspecialchars( $temp );
 229                 }
 230         }
 231
 232         public static function fullurl( $parser, $s = '', $arg = null ) {
 233                 return self::urlFunction( 'getFullURL', $s, $arg );
 234         }
 235
 236         public static function fullurle( $parser, $s = '', $arg = null ) {
 237                 $temp = self::urlFunction( 'getFullURL', $s, $arg );
 238                 if ( !is_string( $temp ) ) {
 239                         return $temp;
 240                 } else {
 241                         return htmlspecialchars( $temp );
 242                 }
 243         }
 244
 245         public static function canonicalurl( $parser, $s = '', $arg = null ) {
 246                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 247         }
 248
 249         public static function canonicalurle( $parser, $s = '', $arg = null ) {
 250                 $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
 251                 if ( !is_string( $temp ) ) {
 252                         return $temp;
 253                 } else {
 254                         return htmlspecialchars( $temp );
 255                 }
 256         }
 257
 258         public static function urlFunction( $func, $s = '', $arg = null ) {
 259                 $title = Title::newFromText( $s );
 260                 # Due to order of execution of a lot of bits, the values might be encoded
 261                 # before arriving here; if that's true, then the title can't be created
 262                 # and the variable will fail. If we can't get a decent title from the first
 263                 # attempt, url-decode and try for a second.
 264                 if ( is_null( $title ) ) {
 265                         $title = Title::newFromURL( urldecode( $s ) );
 266                 }
 267                 if ( !is_null( $title ) ) {
 268                         # Convert NS_MEDIA -> NS_FILE
 269                         if ( $title->inNamespace( NS_MEDIA ) ) {
 270                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 271                         }
 272                         if ( !is_null( $arg ) ) {
 273                                 $text = $title->$func( $arg );
 274                         } else {
 275                                 $text = $title->$func();
 276                         }
 277                         return $text;
 278                 } else {
 279                         return [ 'found' => false ];
 280                 }
 281         }
 282
 283         /**
 284          * @param Parser $parser
 285          * @param string $num
 286          * @param string|null $arg
 287          * @return string
 288          */
 289         public static function formatnum( $parser, $num = '', $arg = null ) {
 290                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg ) ) {
 291                         $func = [ $parser->getFunctionLang(), 'parseFormattedNumber' ];
 292                 } elseif (
 293                         self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'nocommafysuffix', $arg )
 294                 ) {
 295                         $func = [ $parser->getFunctionLang(), 'formatNumNoSeparators' ];
 296                 } else {
 297                         $func = [ $parser->getFunctionLang(), 'formatNum' ];
 298                 }
 299                 return $parser->markerSkipCallback( $num, $func );
 300         }
 301
 302         /**
 303          * @param Parser $parser
 304          * @param string $case
 305          * @param string $word
 306          * @return string
 307          */
 308         public static function grammar( $parser, $case = '', $word = '' ) {
 309                 $word = $parser->killMarkers( $word );
 310                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 311         }
 312
 313         /**
 314          * @param Parser $parser
 315          * @param string $username
 316          * @param string ...$forms What to output for each gender
 317          * @return string
 318          */
 319         public static function gender( $parser, $username, ...$forms ) {
 320                 // Some shortcuts to avoid loading user data unnecessarily
 321                 if ( count( $forms ) === 0 ) {
 322                         return '';
 323                 } elseif ( count( $forms ) === 1 ) {
 324                         return $forms[0];
 325                 }
 326
 327                 $username = trim( $username );
 328
 329                 $gender = User::getDefaultOption( 'gender' );
 330
 331                 // allow prefix and normalize (e.g. "&#42;foo" -> "*foo" ).
 332                 $title = Title::newFromText( $username, NS_USER );
 333
 334                 if ( $title && $title->inNamespace( NS_USER ) ) {
 335                         $username = $title->getText();
 336                 }
 337
 338                 // check parameter, or use the ParserOptions if in interface message
 339                 $user = User::newFromName( $username );
 340                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
 341                 if ( $user ) {
 342                         $gender = $genderCache->getGenderOf( $user, __METHOD__ );
 343                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 344                         $gender = $genderCache->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 345                 }
 346                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 347                 return $ret;
 348         }
 349
 350         /**
 351          * @param Parser $parser
 352          * @param string $text
 353          * @param string ...$forms What to output for each number (singular, dual, plural, etc.)
 354          * @return string
 355          */
 356         public static function plural( $parser, $text = '', ...$forms ) {
 357                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 358                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 359                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 360         }
 361
 362         /**
 363          * @param Parser $parser
 364          * @param string $text
 365          * @return string
 366          */
 367         public static function bidi( $parser, $text = '' ) {
 368                 return $parser->getFunctionLang()->embedBidi( $text );
 369         }
 370
 371         /**
 372          * Override the title of the page when viewed, provided we've been given a
 373          * title which will normalise to the canonical title
 374          *
 375          * @param Parser $parser Parent parser
 376          * @param string $text Desired title text
 377          * @param string $uarg
 378          * @return string
 379          */
 380         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 381                 global $wgRestrictDisplayTitle;
 382
 383                 static $magicWords = null;
 384                 if ( is_null( $magicWords ) ) {
 385                         $magicWords = $parser->getMagicWordFactory()->newArray(
 386                                 [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
 387                 }
 388                 $arg = $magicWords->matchStartToEnd( $uarg );
 389
 390                 // parse a limited subset of wiki markup (just the single quote items)
 391                 $text = $parser->doQuotes( $text );
 392
 393                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 394                 $text = $parser->killMarkers( $text );
 395
 396                 // list of disallowed tags for DISPLAYTITLE
 397                 // these will be escaped even though they are allowed in normal wiki text
 398                 $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 399                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];
 400
 401                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 402                 if ( $wgRestrictDisplayTitle ) {
 403                         $htmlTagsCallback = function ( &$params ) {
 404                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 405
 406                                 if ( isset( $decoded['style'] ) ) {
 407                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 408                                         // calling it twice doesn't hurt
 409                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 410
 411                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 412                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 413                                         }
 414                                 }
 415
 416                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 417                         };
 418                 } else {
 419                         $htmlTagsCallback = null;
 420                 }
 421
 422                 // only requested titles that normalize to the actual title are allowed through
 423                 // if $wgRestrictDisplayTitle is true (it is by default)
 424                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 425                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 426                         $text,
 427                         $htmlTagsCallback,
 428                         [],
 429                         [],
 430                         $bad
 431                 ) );
 432                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 433
 434                 if ( !$wgRestrictDisplayTitle ||
 435                         ( $title instanceof Title
 436                         && !$title->hasFragment()
 437                         && $title->equals( $parser->mTitle ) )
 438                 ) {
 439                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 440                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 441                                 $parser->mOutput->setDisplayTitle( $text );
 442                         }
 443                         if ( $old !== false && $old !== $text && !$arg ) {
 444                                 $converter = $parser->getTargetLanguage()->getConverter();
 445                                 return '<span class="error">' .
 446                                         wfMessage( 'duplicate-displaytitle',
 447                                                 // Message should be parsed, but these params should only be escaped.
 448                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 449                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 450                                         )->inContentLanguage()->text() .
 451                                         '</span>';
 452                         } else {
 453                                 return '';
 454                         }
 455                 } else {
 456                         $parser->getOutput()->addWarning(
 457                                 wfMessage( 'restricted-displaytitle',
 458                                         // Message should be parsed, but this param should only be escaped.
 459                                         wfEscapeWikiText( $text )
 460                                 )->text()
 461                         );
 462                         $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
 463                 }
 464         }
 465
 466         /**
 467          * Matches the given value against the value of given magic word
 468          *
 469          * @param MagicWordFactory $magicWordFactory A factory to get the word from, e.g., from
 470          *   $parser->getMagicWordFactory()
 471          * @param string $magicword Magic word key
 472          * @param string $value Value to match
 473          * @return bool True on successful match
 474          */
 475         private static function matchAgainstMagicword(
 476                 MagicWordFactory $magicWordFactory, $magicword, $value
 477         ) {
 478                 $value = trim( strval( $value ) );
 479                 if ( $value === '' ) {
 480                         return false;
 481                 }
 482                 $mwObject = $magicWordFactory->get( $magicword );
 483                 return $mwObject->matchStartToEnd( $value );
 484         }
 485
 486         /**
 487          * Formats a number according to a language.
 488          *
 489          * @param int|float $num
 490          * @param string $raw
 491          * @param Language|StubUserLang $language
 492          * @param MagicWordFactory|null $magicWordFactory To evaluate $raw
 493          * @return string
 494          */
 495         public static function formatRaw(
 496                 $num, $raw, $language, MagicWordFactory $magicWordFactory = null
 497         ) {
 498                 if ( $raw !== null && !$magicWordFactory ) {
 499                         $magicWordFactory = MediaWikiServices::getInstance()->getMagicWordFactory();
 500                 }
 501                 if (
 502                         $raw !== null && self::matchAgainstMagicword( $magicWordFactory, 'rawsuffix', $raw )
 503                 ) {
 504                         return $num;
 505                 } else {
 506                         return $language->formatNum( $num );
 507                 }
 508         }
 509
 510         public static function numberofpages( $parser, $raw = null ) {
 511                 return self::formatRaw( SiteStats::pages(), $raw, $parser->getFunctionLang() );
 512         }
 513
 514         public static function numberofusers( $parser, $raw = null ) {
 515                 return self::formatRaw( SiteStats::users(), $raw, $parser->getFunctionLang() );
 516         }
 517
 518         public static function numberofactiveusers( $parser, $raw = null ) {
 519                 return self::formatRaw( SiteStats::activeUsers(), $raw, $parser->getFunctionLang() );
 520         }
 521
 522         public static function numberofarticles( $parser, $raw = null ) {
 523                 return self::formatRaw( SiteStats::articles(), $raw, $parser->getFunctionLang() );
 524         }
 525
 526         public static function numberoffiles( $parser, $raw = null ) {
 527                 return self::formatRaw( SiteStats::images(), $raw, $parser->getFunctionLang() );
 528         }
 529
 530         public static function numberofadmins( $parser, $raw = null ) {
 531                 return self::formatRaw(
 532                         SiteStats::numberingroup( 'sysop' ),
 533                         $raw,
 534                         $parser->getFunctionLang()
 535                 );
 536         }
 537
 538         public static function numberofedits( $parser, $raw = null ) {
 539                 return self::formatRaw( SiteStats::edits(), $raw, $parser->getFunctionLang() );
 540         }
 541
 542         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 543                 return self::formatRaw(
 544                         SiteStats::pagesInNs( intval( $namespace ) ),
 545                         $raw,
 546                         $parser->getFunctionLang()
 547                 );
 548         }
 549
 550         public static function numberingroup( $parser, $name = '', $raw = null ) {
 551                 return self::formatRaw(
 552                         SiteStats::numberingroup( strtolower( $name ) ),
 553                         $raw,
 554                         $parser->getFunctionLang()
 555                 );
 556         }
 557
 558         /**
 559          * Given a title, return the namespace name that would be given by the
 560          * corresponding magic word
 561          * Note: function name changed to "mwnamespace" rather than "namespace"
 562          * to not break PHP 5.3
 563          * @param Parser $parser
 564          * @param string|null $title
 565          * @return mixed|string
 566          */
 567         public static function mwnamespace( $parser, $title = null ) {
 568                 $t = Title::newFromText( $title );
 569                 if ( is_null( $t ) ) {
 570                         return '';
 571                 }
 572                 return str_replace( '_', ' ', $t->getNsText() );
 573         }
 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
 583         public static function namespacenumber( $parser, $title = null ) {
 584                 $t = Title::newFromText( $title );
 585                 if ( is_null( $t ) ) {
 586                         return '';
 587                 }
 588                 return $t->getNamespace();
 589         }
 590
 591         public static function talkspace( $parser, $title = null ) {
 592                 $t = Title::newFromText( $title );
 593                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 594                         return '';
 595                 }
 596                 return str_replace( '_', ' ', $t->getTalkNsText() );
 597         }
 598
 599         public static function talkspacee( $parser, $title = null ) {
 600                 $t = Title::newFromText( $title );
 601                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 602                         return '';
 603                 }
 604                 return wfUrlencode( $t->getTalkNsText() );
 605         }
 606
 607         public static function subjectspace( $parser, $title = null ) {
 608                 $t = Title::newFromText( $title );
 609                 if ( is_null( $t ) ) {
 610                         return '';
 611                 }
 612                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 613         }
 614
 615         public static function subjectspacee( $parser, $title = null ) {
 616                 $t = Title::newFromText( $title );
 617                 if ( is_null( $t ) ) {
 618                         return '';
 619                 }
 620                 return wfUrlencode( $t->getSubjectNsText() );
 621         }
 622
 623         /**
 624          * Functions to get and normalize pagenames, corresponding to the magic words
 625          * of the same names
 626          * @param Parser $parser
 627          * @param string|null $title
 628          * @return string
 629          */
 630         public static function pagename( $parser, $title = null ) {
 631                 $t = Title::newFromText( $title );
 632                 if ( is_null( $t ) ) {
 633                         return '';
 634                 }
 635                 return wfEscapeWikiText( $t->getText() );
 636         }
 637
 638         public static function pagenamee( $parser, $title = null ) {
 639                 $t = Title::newFromText( $title );
 640                 if ( is_null( $t ) ) {
 641                         return '';
 642                 }
 643                 return wfEscapeWikiText( $t->getPartialURL() );
 644         }
 645
 646         public static function fullpagename( $parser, $title = null ) {
 647                 $t = Title::newFromText( $title );
 648                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 649                         return '';
 650                 }
 651                 return wfEscapeWikiText( $t->getPrefixedText() );
 652         }
 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
 662         public static function subpagename( $parser, $title = null ) {
 663                 $t = Title::newFromText( $title );
 664                 if ( is_null( $t ) ) {
 665                         return '';
 666                 }
 667                 return wfEscapeWikiText( $t->getSubpageText() );
 668         }
 669
 670         public static function subpagenamee( $parser, $title = null ) {
 671                 $t = Title::newFromText( $title );
 672                 if ( is_null( $t ) ) {
 673                         return '';
 674                 }
 675                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 676         }
 677
 678         public static function rootpagename( $parser, $title = null ) {
 679                 $t = Title::newFromText( $title );
 680                 if ( is_null( $t ) ) {
 681                         return '';
 682                 }
 683                 return wfEscapeWikiText( $t->getRootText() );
 684         }
 685
 686         public static function rootpagenamee( $parser, $title = null ) {
 687                 $t = Title::newFromText( $title );
 688                 if ( is_null( $t ) ) {
 689                         return '';
 690                 }
 691                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
 692         }
 693
 694         public static function basepagename( $parser, $title = null ) {
 695                 $t = Title::newFromText( $title );
 696                 if ( is_null( $t ) ) {
 697                         return '';
 698                 }
 699                 return wfEscapeWikiText( $t->getBaseText() );
 700         }
 701
 702         public static function basepagenamee( $parser, $title = null ) {
 703                 $t = Title::newFromText( $title );
 704                 if ( is_null( $t ) ) {
 705                         return '';
 706                 }
 707                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 708         }
 709
 710         public static function talkpagename( $parser, $title = null ) {
 711                 $t = Title::newFromText( $title );
 712                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 713                         return '';
 714                 }
 715                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 716         }
 717
 718         public static function talkpagenamee( $parser, $title = null ) {
 719                 $t = Title::newFromText( $title );
 720                 if ( is_null( $t ) || !$t->canHaveTalkPage() ) {
 721                         return '';
 722                 }
 723                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 724         }
 725
 726         public static function subjectpagename( $parser, $title = null ) {
 727                 $t = Title::newFromText( $title );
 728                 if ( is_null( $t ) ) {
 729                         return '';
 730                 }
 731                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 732         }
 733
 734         public static function subjectpagenamee( $parser, $title = null ) {
 735                 $t = Title::newFromText( $title );
 736                 if ( is_null( $t ) ) {
 737                         return '';
 738                 }
 739                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 740         }
 741
 742         /**
 743          * Return the number of pages, files or subcats in the given category,
 744          * or 0 if it's nonexistent. This is an expensive parser function and
 745          * can't be called too many times per page.
 746          * @param Parser $parser
 747          * @param string $name
 748          * @param string|null $arg1
 749          * @param string|null $arg2
 750          * @return string
 751          */
 752         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 753                 static $magicWords = null;
 754                 if ( is_null( $magicWords ) ) {
 755                         $magicWords = $parser->getMagicWordFactory()->newArray( [
 756                                 'pagesincategory_all',
 757                                 'pagesincategory_pages',
 758                                 'pagesincategory_subcats',
 759                                 'pagesincategory_files'
 760                         ] );
 761                 }
 762                 static $cache = [];
 763
 764                 // split the given option to its variable
 765                 if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg1 ) ) {
 766                         // {{pagesincategory:|raw[|type]}}
 767                         $raw = $arg1;
 768                         $type = $magicWords->matchStartToEnd( $arg2 );
 769                 } else {
 770                         // {{pagesincategory:[|type[|raw]]}}
 771                         $type = $magicWords->matchStartToEnd( $arg1 );
 772                         $raw = $arg2;
 773                 }
 774                 if ( !$type ) { // backward compatibility
 775                         $type = 'pagesincategory_all';
 776                 }
 777
 778                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 779                 if ( !$title ) { # invalid title
 780                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 781                 }
 782                 $parser->getContentLanguage()->findVariantLink( $name, $title, true );
 783
 784                 // Normalize name for cache
 785                 $name = $title->getDBkey();
 786
 787                 if ( !isset( $cache[$name] ) ) {
 788                         $category = Category::newFromTitle( $title );
 789
 790                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 791                         if ( $parser->incrementExpensiveFunctionCount() ) {
 792                                 // $allCount is the total number of cat members,
 793                                 // not the count of how many members are normal pages.
 794                                 $allCount = (int)$category->getPageCount();
 795                                 $subcatCount = (int)$category->getSubcatCount();
 796                                 $fileCount = (int)$category->getFileCount();
 797                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 798                         }
 799                         $cache[$name]['pagesincategory_all'] = $allCount;
 800                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 801                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 802                         $cache[$name]['pagesincategory_files'] = $fileCount;
 803                 }
 804
 805                 $count = $cache[$name][$type];
 806                 return self::formatRaw( $count, $raw, $parser->getFunctionLang() );
 807         }
 808
 809         /**
 810          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 811          * expensive parser function and can't be called too many times per page.
 812          *
 813          * @param Parser $parser
 814          * @param string $page Name of page to check (Default: empty string)
 815          * @param string|null $raw Should number be human readable with commas or just number
 816          * @return string
 817          */
 818         public static function pagesize( $parser, $page = '', $raw = null ) {
 819                 $title = Title::newFromText( $page );
 820
 821                 if ( !is_object( $title ) ) {
 822                         return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
 823                 }
 824
 825                 // fetch revision from cache/database and return the value
 826                 $rev = self::getCachedRevisionObject( $parser, $title );
 827                 $length = $rev ? $rev->getSize() : 0;
 828                 if ( $length === null ) {
 829                         // We've had bugs where rev_len was not being recorded for empty pages, see T135414
 830                         $length = 0;
 831                 }
 832                 return self::formatRaw( $length, $raw, $parser->getFunctionLang() );
 833         }
 834
 835         /**
 836          * Returns the requested protection level for the current page. This
 837          * is an expensive parser function and can't be called too many times
 838          * per page, unless the protection levels/expiries for the given title
 839          * have already been retrieved
 840          *
 841          * @param Parser $parser
 842          * @param string $type
 843          * @param string $title
 844          *
 845          * @return string
 846          */
 847         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 848                 $titleObject = Title::newFromText( $title );
 849                 if ( !( $titleObject instanceof Title ) ) {
 850                         $titleObject = $parser->mTitle;
 851                 }
 852                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 853                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 854                         # Title::getRestrictions returns an array, its possible it may have
 855                         # multiple values in the future
 856                         return implode( ',', $restrictions );
 857                 }
 858                 return '';
 859         }
 860
 861         /**
 862          * Returns the requested protection expiry for the current page. This
 863          * is an expensive parser function and can't be called too many times
 864          * per page, unless the protection levels/expiries for the given title
 865          * have already been retrieved
 866          *
 867          * @param Parser $parser
 868          * @param string $type
 869          * @param string $title
 870          *
 871          * @return string
 872          */
 873         public static function protectionexpiry( $parser, $type = '', $title = '' ) {
 874                 $titleObject = Title::newFromText( $title );
 875                 if ( !( $titleObject instanceof Title ) ) {
 876                         $titleObject = $parser->mTitle;
 877                 }
 878                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 879                         $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
 880                         // getRestrictionExpiry() returns false on invalid type; trying to
 881                         // match protectionlevel() function that returns empty string instead
 882                         if ( $expiry === false ) {
 883                                 $expiry = '';
 884                         }
 885                         return $expiry;
 886                 }
 887                 return '';
 888         }
 889
 890         /**
 891          * Gives language names.
 892          * @param Parser $parser
 893          * @param string $code Language code (of which to get name)
 894          * @param string $inLanguage Language code (in which to get name)
 895          * @return string
 896          */
 897         public static function language( $parser, $code = '', $inLanguage = '' ) {
 898                 $code = strtolower( $code );
 899                 $inLanguage = strtolower( $inLanguage );
 900                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 901                 return $lang !== '' ? $lang : LanguageCode::bcp47( $code );
 902         }
 903
 904         /**
 905          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 906          * @param Parser $parser
 907          * @param string $string
 908          * @param string $length
 909          * @param string $padding
 910          * @param int $direction
 911          * @return string
 912          */
 913         public static function pad(
 914                 $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
 915         ) {
 916                 $padding = $parser->killMarkers( $padding );
 917                 $lengthOfPadding = mb_strlen( $padding );
 918                 if ( $lengthOfPadding == 0 ) {
 919                         return $string;
 920                 }
 921
 922                 # The remaining length to add counts down to 0 as padding is added
 923                 $length = min( (int)$length, 500 ) - mb_strlen( $string );
 924                 if ( $length <= 0 ) {
 925                         // Nothing to add
 926                         return $string;
 927                 }
 928
 929                 # $finalPadding is just $padding repeated enough times so that
 930                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 931                 $finalPadding = '';
 932                 while ( $length > 0 ) {
 933                         # If $length < $lengthofPadding, truncate $padding so we get the
 934                         # exact length desired.
 935                         $finalPadding .= mb_substr( $padding, 0, $length );
 936                         $length -= $lengthOfPadding;
 937                 }
 938
 939                 if ( $direction == STR_PAD_LEFT ) {
 940                         return $finalPadding . $string;
 941                 } else {
 942                         return $string . $finalPadding;
 943                 }
 944         }
 945
 946         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 947                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 948         }
 949
 950         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 951                 return self::pad( $parser, $string, $length, $padding );
 952         }
 953
 954         /**
 955          * @param Parser $parser
 956          * @param string $text
 957          * @return string
 958          */
 959         public static function anchorencode( $parser, $text ) {
 960                 $text = $parser->killMarkers( $text );
 961                 $section = (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 962                 return Sanitizer::safeEncodeAttribute( $section );
 963         }
 964
 965         public static function special( $parser, $text ) {
 966                 list( $page, $subpage ) = MediaWikiServices::getInstance()->getSpecialPageFactory()->
 967                         resolveAlias( $text );
 968                 if ( $page ) {
 969                         $title = SpecialPage::getTitleFor( $page, $subpage );
 970                         return $title->getPrefixedText();
 971                 } else {
 972                         // unknown special page, just use the given text as its title, if at all possible
 973                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 974                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 975                 }
 976         }
 977
 978         public static function speciale( $parser, $text ) {
 979                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 980         }
 981
 982         /**
 983          * @param Parser $parser
 984          * @param string $text The sortkey to use
 985          * @param string $uarg Either "noreplace" or "noerror" (in en)
 986          *   both suppress errors, and noreplace does nothing if
 987          *   a default sortkey already exists.
 988          * @return string
 989          */
 990         public static function defaultsort( $parser, $text, $uarg = '' ) {
 991                 static $magicWords = null;
 992                 if ( is_null( $magicWords ) ) {
 993                         $magicWords = $parser->getMagicWordFactory()->newArray(
 994                                 [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
 995                 }
 996                 $arg = $magicWords->matchStartToEnd( $uarg );
 997
 998                 $text = trim( $text );
 999                 if ( strlen( $text ) == 0 ) {
1000                         return '';
1001                 }
1002                 $old = $parser->getCustomDefaultSort();
1003                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
1004                         $parser->setDefaultSort( $text );
1005                 }
1006
1007                 if ( $old === false || $old == $text || $arg ) {
1008                         return '';
1009                 } else {
1010                         $converter = $parser->getTargetLanguage()->getConverter();
1011                         return '<span class="error">' .
1012                                 wfMessage( 'duplicate-defaultsort',
1013                                         // Message should be parsed, but these params should only be escaped.
1014                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
1015                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
1016                                 )->inContentLanguage()->text() .
1017                                 '</span>';
1018                 }
1019         }
1020
1021         /**
1022          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
1023          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
1024          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
1025          *
1026          * @param Parser $parser
1027          * @param string $name
1028          * @param string $argA
1029          * @param string $argB
1030          * @return array|string
1031          */
1032         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
1033                 $file = wfFindFile( $name );
1034
1035                 if ( $argA == 'nowiki' ) {
1036                         // {{filepath: | option [| size] }}
1037                         $isNowiki = true;
1038                         $parsedWidthParam = Parser::parseWidthParam( $argB );
1039                 } else {
1040                         // {{filepath: [| size [|option]] }}
1041                         $parsedWidthParam = Parser::parseWidthParam( $argA );
1042                         $isNowiki = ( $argB == 'nowiki' );
1043                 }
1044
1045                 if ( $file ) {
1046                         $url = $file->getFullUrl();
1047
1048                         // If a size is requested...
1049                         if ( count( $parsedWidthParam ) ) {
1050                                 $mto = $file->transform( $parsedWidthParam );
1051                                 // ... and we can
1052                                 if ( $mto && !$mto->isError() ) {
1053                                         // ... change the URL to point to a thumbnail.
1054                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
1055                                 }
1056                         }
1057                         if ( $isNowiki ) {
1058                                 return [ $url, 'nowiki' => true ];
1059                         }
1060                         return $url;
1061                 } else {
1062                         return '';
1063                 }
1064         }
1065
1066         /**
1067          * Parser function to extension tag adaptor
1068          * @param Parser $parser
1069          * @param PPFrame $frame
1070          * @param PPNode[] $args
1071          * @return string
1072          */
1073         public static function tagObj( $parser, $frame, $args ) {
1074                 if ( !count( $args ) ) {
1075                         return '';
1076                 }
1077                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
1078
1079                 if ( count( $args ) ) {
1080                         $inner = $frame->expand( array_shift( $args ) );
1081                 } else {
1082                         $inner = null;
1083                 }
1084
1085                 $attributes = [];
1086                 foreach ( $args as $arg ) {
1087                         $bits = $arg->splitArg();
1088                         if ( strval( $bits['index'] ) === '' ) {
1089                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1090                                 $value = trim( $frame->expand( $bits['value'] ) );
1091                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
1092                                         $value = $m[1] ?? '';
1093                                 }
1094                                 $attributes[$name] = $value;
1095                         }
1096                 }
1097
1098                 $stripList = $parser->getStripList();
1099                 if ( !in_array( $tagName, $stripList ) ) {
1100                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
1101                         $attrText = '';
1102                         foreach ( $attributes as $name => $value ) {
1103                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
1104                         }
1105                         if ( $inner === null ) {
1106                                 return "<$tagName$attrText/>";
1107                         }
1108                         return "<$tagName$attrText>$inner</$tagName>";
1109                 }
1110
1111                 $params = [
1112                         'name' => $tagName,
1113                         'inner' => $inner,
1114                         'attributes' => $attributes,
1115                         'close' => "</$tagName>",
1116                 ];
1117                 return $parser->extensionSubstitution( $params, $frame );
1118         }
1119
1120         /**
1121          * Fetched the current revision of the given title and return this.
1122          * Will increment the expensive function count and
1123          * add a template link to get the value refreshed on changes.
1124          * For a given title, which is equal to the current parser title,
1125          * the revision object from the parser is used, when that is the current one
1126          *
1127          * @param Parser $parser
1128          * @param Title $title
1129          * @return Revision
1130          * @since 1.23
1131          */
1132         private static function getCachedRevisionObject( $parser, $title = null ) {
1133                 if ( is_null( $title ) ) {
1134                         return null;
1135                 }
1136
1137                 // Use the revision from the parser itself, when param is the current page
1138                 // and the revision is the current one
1139                 if ( $title->equals( $parser->getTitle() ) ) {
1140                         $parserRev = $parser->getRevisionObject();
1141                         if ( $parserRev && $parserRev->isCurrent() ) {
1142                                 // force reparse after edit with vary-revision flag
1143                                 $parser->getOutput()->setFlag( 'vary-revision' );
1144                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1145                                 return $parserRev;
1146                         }
1147                 }
1148
1149                 // Normalize name for cache
1150                 $page = $title->getPrefixedDBkey();
1151
1152                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1153                         && !$parser->incrementExpensiveFunctionCount() ) {
1154                         return null;
1155                 }
1156                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1157                 $pageID = $rev ? $rev->getPage() : 0;
1158                 $revID = $rev ? $rev->getId() : 0;
1159
1160                 // Register dependency in templatelinks
1161                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1162
1163                 return $rev;
1164         }
1165
1166         /**
1167          * Get the pageid of a specified page
1168          * @param Parser $parser
1169          * @param string|null $title Title to get the pageid from
1170          * @return int|null|string
1171          * @since 1.23
1172          */
1173         public static function pageid( $parser, $title = null ) {
1174                 $t = Title::newFromText( $title );
1175                 if ( is_null( $t ) ) {
1176                         return '';
1177                 }
1178                 // Use title from parser to have correct pageid after edit
1179                 if ( $t->equals( $parser->getTitle() ) ) {
1180                         $t = $parser->getTitle();
1181                         return $t->getArticleID();
1182                 }
1183
1184                 // These can't have ids
1185                 if ( !$t->canExist() || $t->isExternal() ) {
1186                         return 0;
1187                 }
1188
1189                 // Check the link cache, maybe something already looked it up.
1190                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1191                 $pdbk = $t->getPrefixedDBkey();
1192                 $id = $linkCache->getGoodLinkID( $pdbk );
1193                 if ( $id != 0 ) {
1194                         $parser->mOutput->addLink( $t, $id );
1195                         return $id;
1196                 }
1197                 if ( $linkCache->isBadLink( $pdbk ) ) {
1198                         $parser->mOutput->addLink( $t, 0 );
1199                         return $id;
1200                 }
1201
1202                 // We need to load it from the DB, so mark expensive
1203                 if ( $parser->incrementExpensiveFunctionCount() ) {
1204                         $id = $t->getArticleID();
1205                         $parser->mOutput->addLink( $t, $id );
1206                         return $id;
1207                 }
1208                 return null;
1209         }
1210
1211         /**
1212          * Get the id from the last revision of a specified page.
1213          * @param Parser $parser
1214          * @param string|null $title Title to get the id from
1215          * @return int|null|string
1216          * @since 1.23
1217          */
1218         public static function revisionid( $parser, $title = null ) {
1219                 $t = Title::newFromText( $title );
1220                 if ( is_null( $t ) ) {
1221                         return '';
1222                 }
1223                 // fetch revision from cache/database and return the value
1224                 $rev = self::getCachedRevisionObject( $parser, $t );
1225                 return $rev ? $rev->getId() : '';
1226         }
1227
1228         /**
1229          * Get the day from the last revision of a specified page.
1230          * @param Parser $parser
1231          * @param string|null $title Title to get the day from
1232          * @return string
1233          * @since 1.23
1234          */
1235         public static function revisionday( $parser, $title = null ) {
1236                 $t = Title::newFromText( $title );
1237                 if ( is_null( $t ) ) {
1238                         return '';
1239                 }
1240                 // fetch revision from cache/database and return the value
1241                 $rev = self::getCachedRevisionObject( $parser, $t );
1242                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1243         }
1244
1245         /**
1246          * Get the day with leading zeros from the last revision of a specified page.
1247          * @param Parser $parser
1248          * @param string|null $title Title to get the day from
1249          * @return string
1250          * @since 1.23
1251          */
1252         public static function revisionday2( $parser, $title = null ) {
1253                 $t = Title::newFromText( $title );
1254                 if ( is_null( $t ) ) {
1255                         return '';
1256                 }
1257                 // fetch revision from cache/database and return the value
1258                 $rev = self::getCachedRevisionObject( $parser, $t );
1259                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1260         }
1261
1262         /**
1263          * Get the month with leading zeros from the last revision of a specified page.
1264          * @param Parser $parser
1265          * @param string|null $title Title to get the month from
1266          * @return string
1267          * @since 1.23
1268          */
1269         public static function revisionmonth( $parser, $title = null ) {
1270                 $t = Title::newFromText( $title );
1271                 if ( is_null( $t ) ) {
1272                         return '';
1273                 }
1274                 // fetch revision from cache/database and return the value
1275                 $rev = self::getCachedRevisionObject( $parser, $t );
1276                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1277         }
1278
1279         /**
1280          * Get the month from the last revision of a specified page.
1281          * @param Parser $parser
1282          * @param string|null $title Title to get the month from
1283          * @return string
1284          * @since 1.23
1285          */
1286         public static function revisionmonth1( $parser, $title = null ) {
1287                 $t = Title::newFromText( $title );
1288                 if ( is_null( $t ) ) {
1289                         return '';
1290                 }
1291                 // fetch revision from cache/database and return the value
1292                 $rev = self::getCachedRevisionObject( $parser, $t );
1293                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1294         }
1295
1296         /**
1297          * Get the year from the last revision of a specified page.
1298          * @param Parser $parser
1299          * @param string|null $title Title to get the year from
1300          * @return string
1301          * @since 1.23
1302          */
1303         public static function revisionyear( $parser, $title = null ) {
1304                 $t = Title::newFromText( $title );
1305                 if ( is_null( $t ) ) {
1306                         return '';
1307                 }
1308                 // fetch revision from cache/database and return the value
1309                 $rev = self::getCachedRevisionObject( $parser, $t );
1310                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1311         }
1312
1313         /**
1314          * Get the timestamp from the last revision of a specified page.
1315          * @param Parser $parser
1316          * @param string|null $title Title to get the timestamp from
1317          * @return string
1318          * @since 1.23
1319          */
1320         public static function revisiontimestamp( $parser, $title = null ) {
1321                 $t = Title::newFromText( $title );
1322                 if ( is_null( $t ) ) {
1323                         return '';
1324                 }
1325                 // fetch revision from cache/database and return the value
1326                 $rev = self::getCachedRevisionObject( $parser, $t );
1327                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1328         }
1329
1330         /**
1331          * Get the user from the last revision of a specified page.
1332          * @param Parser $parser
1333          * @param string|null $title Title to get the user from
1334          * @return string
1335          * @since 1.23
1336          */
1337         public static function revisionuser( $parser, $title = null ) {
1338                 $t = Title::newFromText( $title );
1339                 if ( is_null( $t ) ) {
1340                         return '';
1341                 }
1342                 // fetch revision from cache/database and return the value
1343                 $rev = self::getCachedRevisionObject( $parser, $t );
1344                 return $rev ? $rev->getUserText() : '';
1345         }
1346
1347         /**
1348          * Returns the sources of any cascading protection acting on a specified page.
1349          * Pages will not return their own title unless they transclude themselves.
1350          * This is an expensive parser function and can't be called too many times per page,
1351          * unless cascading protection sources for the page have already been loaded.
1352          *
1353          * @param Parser $parser
1354          * @param string $title
1355          *
1356          * @return string
1357          * @since 1.23
1358          */
1359         public static function cascadingsources( $parser, $title = '' ) {
1360                 $titleObject = Title::newFromText( $title );
1361                 if ( !( $titleObject instanceof Title ) ) {
1362                         $titleObject = $parser->mTitle;
1363                 }
1364                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1365                         || $parser->incrementExpensiveFunctionCount()
1366                 ) {
1367                         $names = [];
1368                         $sources = $titleObject->getCascadeProtectionSources();
1369                         foreach ( $sources[0] as $sourceTitle ) {
1370                                 $names[] = $sourceTitle->getPrefixedText();
1371                         }
1372                         return implode( '|', $names );
1373                 }
1374                 return '';
1375         }
1376
1377 }