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