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 $defaultPref
 116          *
 117          * @return string
 118          */
 119         public static function formatDate( $parser, $date, $defaultPref = null ) {
 120                 $lang = $parser->getFunctionLang();
 121                 $df = DateFormatter::getInstance( $lang );
 122
 123                 $date = trim( $date );
 124
 125                 $pref = $parser->getOptions()->getDateFormat();
 126
 127                 // Specify a different default date format other than the normal default
 128                 // if the user has 'default' for their setting
 129                 if ( $pref == 'default' && $defaultPref ) {
 130                         $pref = $defaultPref;
 131                 }
 132
 133                 $date = $df->reformat( $pref, $date, [ 'match-whole' ] );
 134                 return $date;
 135         }
 136
 137         public static function ns( $parser, $part1 = '' ) {
 138                 global $wgContLang;
 139                 if ( intval( $part1 ) || $part1 == "0" ) {
 140                         $index = intval( $part1 );
 141                 } else {
 142                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 143                 }
 144                 if ( $index !== false ) {
 145                         return $wgContLang->getFormattedNsText( $index );
 146                 } else {
 147                         return [ 'found' => false ];
 148                 }
 149         }
 150
 151         public static function nse( $parser, $part1 = '' ) {
 152                 $ret = self::ns( $parser, $part1 );
 153                 if ( is_string( $ret ) ) {
 154                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 155                 }
 156                 return $ret;
 157         }
 158
 159         /**
 160          * urlencodes a string according to one of three patterns: (bug 22474)
 161          *
 162          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 163          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 164          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 165          *
 166          * @param Parser $parser
 167          * @param string $s The text to encode.
 168          * @param string $arg (optional): The type of encoding.
 169          * @return string
 170          */
 171         public static function urlencode( $parser, $s = '', $arg = null ) {
 172                 static $magicWords = null;
 173                 if ( is_null( $magicWords ) ) {
 174                         $magicWords = new MagicWordArray( [ 'url_path', 'url_query', 'url_wiki' ] );
 175                 }
 176                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 177
 178                         // Encode as though it's a wiki page, '_' for ' '.
 179                         case 'url_wiki':
 180                                 $func = 'wfUrlencode';
 181                                 $s = str_replace( ' ', '_', $s );
 182                                 break;
 183
 184                         // Encode for an HTTP Path, '%20' for ' '.
 185                         case 'url_path':
 186                                 $func = 'rawurlencode';
 187                                 break;
 188
 189                         // Encode for HTTP query, '+' for ' '.
 190                         case 'url_query':
 191                         default:
 192                                 $func = 'urlencode';
 193                 }
 194                 // See T105242, where the choice to kill markers and various
 195                 // other options were discussed.
 196                 return $func( $parser->killMarkers( $s ) );
 197         }
 198
 199         public static function lcfirst( $parser, $s = '' ) {
 200                 global $wgContLang;
 201                 return $wgContLang->lcfirst( $s );
 202         }
 203
 204         public static function ucfirst( $parser, $s = '' ) {
 205                 global $wgContLang;
 206                 return $wgContLang->ucfirst( $s );
 207         }
 208
 209         /**
 210          * @param Parser $parser
 211          * @param string $s
 212          * @return string
 213          */
 214         public static function lc( $parser, $s = '' ) {
 215                 global $wgContLang;
 216                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'lc' ] );
 217         }
 218
 219         /**
 220          * @param Parser $parser
 221          * @param string $s
 222          * @return string
 223          */
 224         public static function uc( $parser, $s = '' ) {
 225                 global $wgContLang;
 226                 return $parser->markerSkipCallback( $s, [ $wgContLang, 'uc' ] );
 227         }
 228
 229         public static function localurl( $parser, $s = '', $arg = null ) {
 230                 return self::urlFunction( 'getLocalURL', $s, $arg );
 231         }
 232
 233         public static function localurle( $parser, $s = '', $arg = null ) {
 234                 $temp = self::urlFunction( 'getLocalURL', $s, $arg );
 235                 if ( !is_string( $temp ) ) {
 236                         return $temp;
 237                 } else {
 238                         return htmlspecialchars( $temp );
 239                 }
 240         }
 241
 242         public static function fullurl( $parser, $s = '', $arg = null ) {
 243                 return self::urlFunction( 'getFullURL', $s, $arg );
 244         }
 245
 246         public static function fullurle( $parser, $s = '', $arg = null ) {
 247                 $temp = self::urlFunction( 'getFullURL', $s, $arg );
 248                 if ( !is_string( $temp ) ) {
 249                         return $temp;
 250                 } else {
 251                         return htmlspecialchars( $temp );
 252                 }
 253         }
 254
 255         public static function canonicalurl( $parser, $s = '', $arg = null ) {
 256                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 257         }
 258
 259         public static function canonicalurle( $parser, $s = '', $arg = null ) {
 260                 $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
 261                 if ( !is_string( $temp ) ) {
 262                         return $temp;
 263                 } else {
 264                         return htmlspecialchars( $temp );
 265                 }
 266         }
 267
 268         public static function urlFunction( $func, $s = '', $arg = null ) {
 269                 $title = Title::newFromText( $s );
 270                 # Due to order of execution of a lot of bits, the values might be encoded
 271                 # before arriving here; if that's true, then the title can't be created
 272                 # and the variable will fail. If we can't get a decent title from the first
 273                 # attempt, url-decode and try for a second.
 274                 if ( is_null( $title ) ) {
 275                         $title = Title::newFromURL( urldecode( $s ) );
 276                 }
 277                 if ( !is_null( $title ) ) {
 278                         # Convert NS_MEDIA -> NS_FILE
 279                         if ( $title->getNamespace() == NS_MEDIA ) {
 280                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 281                         }
 282                         if ( !is_null( $arg ) ) {
 283                                 $text = $title->$func( $arg );
 284                         } else {
 285                                 $text = $title->$func();
 286                         }
 287                         return $text;
 288                 } else {
 289                         return [ 'found' => false ];
 290                 }
 291         }
 292
 293         /**
 294          * @param Parser $parser
 295          * @param string $num
 296          * @param string $arg
 297          * @return string
 298          */
 299         public static function formatnum( $parser, $num = '', $arg = null ) {
 300                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg ) ) {
 301                         $func = [ $parser->getFunctionLang(), 'parseFormattedNumber' ];
 302                 } elseif ( self::matchAgainstMagicword( 'nocommafysuffix', $arg ) ) {
 303                         $func = [ $parser->getFunctionLang(), 'formatNumNoSeparators' ];
 304                 } else {
 305                         $func = [ $parser->getFunctionLang(), 'formatNum' ];
 306                 }
 307                 return $parser->markerSkipCallback( $num, $func );
 308         }
 309
 310         /**
 311          * @param Parser $parser
 312          * @param string $case
 313          * @param string $word
 314          * @return string
 315          */
 316         public static function grammar( $parser, $case = '', $word = '' ) {
 317                 $word = $parser->killMarkers( $word );
 318                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 319         }
 320
 321         /**
 322          * @param Parser $parser
 323          * @param string $username
 324          * @return string
 325          */
 326         public static function gender( $parser, $username ) {
 327                 $forms = array_slice( func_get_args(), 2 );
 328
 329                 // Some shortcuts to avoid loading user data unnecessarily
 330                 if ( count( $forms ) === 0 ) {
 331                         return '';
 332                 } elseif ( count( $forms ) === 1 ) {
 333                         return $forms[0];
 334                 }
 335
 336                 $username = trim( $username );
 337
 338                 // default
 339                 $gender = User::getDefaultOption( 'gender' );
 340
 341                 // allow prefix.
 342                 $title = Title::newFromText( $username );
 343
 344                 if ( $title && $title->getNamespace() == NS_USER ) {
 345                         $username = $title->getText();
 346                 }
 347
 348                 // check parameter, or use the ParserOptions if in interface message
 349                 $user = User::newFromName( $username );
 350                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
 351                 if ( $user ) {
 352                         $gender = $genderCache->getGenderOf( $user, __METHOD__ );
 353                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 354                         $gender = $genderCache->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 355                 }
 356                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 357                 return $ret;
 358         }
 359
 360         /**
 361          * @param Parser $parser
 362          * @param string $text
 363          * @return string
 364          */
 365         public static function plural( $parser, $text = '' ) {
 366                 $forms = array_slice( func_get_args(), 2 );
 367                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 368                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 369                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 370         }
 371
 372         /**
 373          * @param Parser $parser
 374          * @param string $text
 375          * @return string
 376          */
 377         public static function bidi( $parser, $text = '' ) {
 378                 return $parser->getFunctionLang()->embedBidi( $text );
 379         }
 380
 381         /**
 382          * Override the title of the page when viewed, provided we've been given a
 383          * title which will normalise to the canonical title
 384          *
 385          * @param Parser $parser Parent parser
 386          * @param string $text Desired title text
 387          * @param string $uarg
 388          * @return string
 389          */
 390         public static function displaytitle( $parser, $text = '', $uarg = '' ) {
 391                 global $wgRestrictDisplayTitle;
 392
 393                 static $magicWords = null;
 394                 if ( is_null( $magicWords ) ) {
 395                         $magicWords = new MagicWordArray( [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
 396                 }
 397                 $arg = $magicWords->matchStartToEnd( $uarg );
 398
 399                 // parse a limited subset of wiki markup (just the single quote items)
 400                 $text = $parser->doQuotes( $text );
 401
 402                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 403                 $text = $parser->killMarkers( $text );
 404
 405                 // list of disallowed tags for DISPLAYTITLE
 406                 // these will be escaped even though they are allowed in normal wiki text
 407                 $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 408                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];
 409
 410                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 411                 if ( $wgRestrictDisplayTitle ) {
 412                         $htmlTagsCallback = function ( &$params ) {
 413                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 414
 415                                 if ( isset( $decoded['style'] ) ) {
 416                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 417                                         // calling it twice doesn't hurt
 418                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 419
 420                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 421                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 422                                         }
 423                                 }
 424
 425                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 426                         };
 427                 } else {
 428                         $htmlTagsCallback = null;
 429                 }
 430
 431                 // only requested titles that normalize to the actual title are allowed through
 432                 // if $wgRestrictDisplayTitle is true (it is by default)
 433                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 434                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
 435                         $text,
 436                         $htmlTagsCallback,
 437                         [],
 438                         [],
 439                         $bad
 440                 ) );
 441                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 442
 443                 if ( !$wgRestrictDisplayTitle ||
 444                         ( $title instanceof Title
 445                         && !$title->hasFragment()
 446                         && $title->equals( $parser->mTitle ) )
 447                 ) {
 448                         $old = $parser->mOutput->getProperty( 'displaytitle' );
 449                         if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
 450                                 $parser->mOutput->setDisplayTitle( $text );
 451                         }
 452                         if ( $old !== false && $old !== $text && !$arg ) {
 453                                 $converter = $parser->getConverterLanguage()->getConverter();
 454                                 return '<span class="error">' .
 455                                         wfMessage( 'duplicate-displaytitle',
 456                                                 // Message should be parsed, but these params should only be escaped.
 457                                                 $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 458                                                 $converter->markNoConversion( wfEscapeWikiText( $text ) )
 459                                         )->inContentLanguage()->text() .
 460                                         '</span>';
 461                         } else {
 462                                 return '';
 463                         }
 464                 } else {
 465                         $converter = $parser->getConverterLanguage()->getConverter();
 466                         $parser->getOutput()->addWarning(
 467                                 wfMessage( 'restricted-displaytitle',
 468                                         // Message should be parsed, but this param should only be escaped.
 469                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 470                                 )->text()
 471                         );
 472                         $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
 473                 }
 474         }
 475
 476         /**
 477          * Matches the given value against the value of given magic word
 478          *
 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( $magicword, $value ) {
 484                 $value = trim( strval( $value ) );
 485                 if ( $value === '' ) {
 486                         return false;
 487                 }
 488                 $mwObject = MagicWord::get( $magicword );
 489                 return $mwObject->matchStartToEnd( $value );
 490         }
 491
 492         public static function formatRaw( $num, $raw ) {
 493                 if ( self::matchAgainstMagicword( 'rawsuffix', $raw ) ) {
 494                         return $num;
 495                 } else {
 496                         global $wgContLang;
 497                         return $wgContLang->formatNum( $num );
 498                 }
 499         }
 500         public static function numberofpages( $parser, $raw = null ) {
 501                 return self::formatRaw( SiteStats::pages(), $raw );
 502         }
 503         public static function numberofusers( $parser, $raw = null ) {
 504                 return self::formatRaw( SiteStats::users(), $raw );
 505         }
 506         public static function numberofactiveusers( $parser, $raw = null ) {
 507                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 508         }
 509         public static function numberofarticles( $parser, $raw = null ) {
 510                 return self::formatRaw( SiteStats::articles(), $raw );
 511         }
 512         public static function numberoffiles( $parser, $raw = null ) {
 513                 return self::formatRaw( SiteStats::images(), $raw );
 514         }
 515         public static function numberofadmins( $parser, $raw = null ) {
 516                 return self::formatRaw( SiteStats::numberingroup( 'sysop' ), $raw );
 517         }
 518         public static function numberofedits( $parser, $raw = null ) {
 519                 return self::formatRaw( SiteStats::edits(), $raw );
 520         }
 521         public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 522                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 523         }
 524         public static function numberingroup( $parser, $name = '', $raw = null ) {
 525                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 526         }
 527
 528         /**
 529          * Given a title, return the namespace name that would be given by the
 530          * corresponding magic word
 531          * Note: function name changed to "mwnamespace" rather than "namespace"
 532          * to not break PHP 5.3
 533          * @param Parser $parser
 534          * @param string $title
 535          * @return mixed|string
 536          */
 537         public static function mwnamespace( $parser, $title = null ) {
 538                 $t = Title::newFromText( $title );
 539                 if ( is_null( $t ) ) {
 540                         return '';
 541                 }
 542                 return str_replace( '_', ' ', $t->getNsText() );
 543         }
 544         public static function namespacee( $parser, $title = null ) {
 545                 $t = Title::newFromText( $title );
 546                 if ( is_null( $t ) ) {
 547                         return '';
 548                 }
 549                 return wfUrlencode( $t->getNsText() );
 550         }
 551         public static function namespacenumber( $parser, $title = null ) {
 552                 $t = Title::newFromText( $title );
 553                 if ( is_null( $t ) ) {
 554                         return '';
 555                 }
 556                 return $t->getNamespace();
 557         }
 558         public static function talkspace( $parser, $title = null ) {
 559                 $t = Title::newFromText( $title );
 560                 if ( is_null( $t ) || !$t->canTalk() ) {
 561                         return '';
 562                 }
 563                 return str_replace( '_', ' ', $t->getTalkNsText() );
 564         }
 565         public static function talkspacee( $parser, $title = null ) {
 566                 $t = Title::newFromText( $title );
 567                 if ( is_null( $t ) || !$t->canTalk() ) {
 568                         return '';
 569                 }
 570                 return wfUrlencode( $t->getTalkNsText() );
 571         }
 572         public static function subjectspace( $parser, $title = null ) {
 573                 $t = Title::newFromText( $title );
 574                 if ( is_null( $t ) ) {
 575                         return '';
 576                 }
 577                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 578         }
 579         public static function subjectspacee( $parser, $title = null ) {
 580                 $t = Title::newFromText( $title );
 581                 if ( is_null( $t ) ) {
 582                         return '';
 583                 }
 584                 return wfUrlencode( $t->getSubjectNsText() );
 585         }
 586
 587         /**
 588          * Functions to get and normalize pagenames, corresponding to the magic words
 589          * of the same names
 590          * @param Parser $parser
 591          * @param string $title
 592          * @return string
 593          */
 594         public static function pagename( $parser, $title = null ) {
 595                 $t = Title::newFromText( $title );
 596                 if ( is_null( $t ) ) {
 597                         return '';
 598                 }
 599                 return wfEscapeWikiText( $t->getText() );
 600         }
 601         public static function pagenamee( $parser, $title = null ) {
 602                 $t = Title::newFromText( $title );
 603                 if ( is_null( $t ) ) {
 604                         return '';
 605                 }
 606                 return wfEscapeWikiText( $t->getPartialURL() );
 607         }
 608         public static function fullpagename( $parser, $title = null ) {
 609                 $t = Title::newFromText( $title );
 610                 if ( is_null( $t ) || !$t->canTalk() ) {
 611                         return '';
 612                 }
 613                 return wfEscapeWikiText( $t->getPrefixedText() );
 614         }
 615         public static function fullpagenamee( $parser, $title = null ) {
 616                 $t = Title::newFromText( $title );
 617                 if ( is_null( $t ) || !$t->canTalk() ) {
 618                         return '';
 619                 }
 620                 return wfEscapeWikiText( $t->getPrefixedURL() );
 621         }
 622         public static function subpagename( $parser, $title = null ) {
 623                 $t = Title::newFromText( $title );
 624                 if ( is_null( $t ) ) {
 625                         return '';
 626                 }
 627                 return wfEscapeWikiText( $t->getSubpageText() );
 628         }
 629         public static function subpagenamee( $parser, $title = null ) {
 630                 $t = Title::newFromText( $title );
 631                 if ( is_null( $t ) ) {
 632                         return '';
 633                 }
 634                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 635         }
 636         public static function rootpagename( $parser, $title = null ) {
 637                 $t = Title::newFromText( $title );
 638                 if ( is_null( $t ) ) {
 639                         return '';
 640                 }
 641                 return wfEscapeWikiText( $t->getRootText() );
 642         }
 643         public static function rootpagenamee( $parser, $title = null ) {
 644                 $t = Title::newFromText( $title );
 645                 if ( is_null( $t ) ) {
 646                         return '';
 647                 }
 648                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
 649         }
 650         public static function basepagename( $parser, $title = null ) {
 651                 $t = Title::newFromText( $title );
 652                 if ( is_null( $t ) ) {
 653                         return '';
 654                 }
 655                 return wfEscapeWikiText( $t->getBaseText() );
 656         }
 657         public static function basepagenamee( $parser, $title = null ) {
 658                 $t = Title::newFromText( $title );
 659                 if ( is_null( $t ) ) {
 660                         return '';
 661                 }
 662                 return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 663         }
 664         public static function talkpagename( $parser, $title = null ) {
 665                 $t = Title::newFromText( $title );
 666                 if ( is_null( $t ) || !$t->canTalk() ) {
 667                         return '';
 668                 }
 669                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 670         }
 671         public static function talkpagenamee( $parser, $title = null ) {
 672                 $t = Title::newFromText( $title );
 673                 if ( is_null( $t ) || !$t->canTalk() ) {
 674                         return '';
 675                 }
 676                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 677         }
 678         public static function subjectpagename( $parser, $title = null ) {
 679                 $t = Title::newFromText( $title );
 680                 if ( is_null( $t ) ) {
 681                         return '';
 682                 }
 683                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 684         }
 685         public static function subjectpagenamee( $parser, $title = null ) {
 686                 $t = Title::newFromText( $title );
 687                 if ( is_null( $t ) ) {
 688                         return '';
 689                 }
 690                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 691         }
 692
 693         /**
 694          * Return the number of pages, files or subcats in the given category,
 695          * or 0 if it's nonexistent. This is an expensive parser function and
 696          * can't be called too many times per page.
 697          * @param Parser $parser
 698          * @param string $name
 699          * @param string $arg1
 700          * @param string $arg2
 701          * @return string
 702          */
 703         public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 704                 global $wgContLang;
 705                 static $magicWords = null;
 706                 if ( is_null( $magicWords ) ) {
 707                         $magicWords = new MagicWordArray( [
 708                                 'pagesincategory_all',
 709                                 'pagesincategory_pages',
 710                                 'pagesincategory_subcats',
 711                                 'pagesincategory_files'
 712                         ] );
 713                 }
 714                 static $cache = [];
 715
 716                 // split the given option to its variable
 717                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg1 ) ) {
 718                         // {{pagesincategory:|raw[|type]}}
 719                         $raw = $arg1;
 720                         $type = $magicWords->matchStartToEnd( $arg2 );
 721                 } else {
 722                         // {{pagesincategory:[|type[|raw]]}}
 723                         $type = $magicWords->matchStartToEnd( $arg1 );
 724                         $raw = $arg2;
 725                 }
 726                 if ( !$type ) { // backward compatibility
 727                         $type = 'pagesincategory_all';
 728                 }
 729
 730                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 731                 if ( !$title ) { # invalid title
 732                         return self::formatRaw( 0, $raw );
 733                 }
 734                 $wgContLang->findVariantLink( $name, $title, true );
 735
 736                 // Normalize name for cache
 737                 $name = $title->getDBkey();
 738
 739                 if ( !isset( $cache[$name] ) ) {
 740                         $category = Category::newFromTitle( $title );
 741
 742                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 743                         if ( $parser->incrementExpensiveFunctionCount() ) {
 744                                 // $allCount is the total number of cat members,
 745                                 // not the count of how many members are normal pages.
 746                                 $allCount = (int)$category->getPageCount();
 747                                 $subcatCount = (int)$category->getSubcatCount();
 748                                 $fileCount = (int)$category->getFileCount();
 749                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 750                         }
 751                         $cache[$name]['pagesincategory_all'] = $allCount;
 752                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 753                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 754                         $cache[$name]['pagesincategory_files'] = $fileCount;
 755                 }
 756
 757                 $count = $cache[$name][$type];
 758                 return self::formatRaw( $count, $raw );
 759         }
 760
 761         /**
 762          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 763          * expensive parser function and can't be called too many times per page.
 764          *
 765          * @param Parser $parser
 766          * @param string $page Name of page to check (Default: empty string)
 767          * @param string $raw Should number be human readable with commas or just number
 768          * @return string
 769          */
 770         public static function pagesize( $parser, $page = '', $raw = null ) {
 771                 $title = Title::newFromText( $page );
 772
 773                 if ( !is_object( $title ) ) {
 774                         return self::formatRaw( 0, $raw );
 775                 }
 776
 777                 // fetch revision from cache/database and return the value
 778                 $rev = self::getCachedRevisionObject( $parser, $title );
 779                 $length = $rev ? $rev->getSize() : 0;
 780                 if ( $length === null ) {
 781                         // We've had bugs where rev_len was not being recorded for empty pages, see T135414
 782                         $length = 0;
 783                 }
 784                 return self::formatRaw( $length, $raw );
 785         }
 786
 787         /**
 788          * Returns the requested protection level for the current page. This
 789          * is an expensive parser function and can't be called too many times
 790          * per page, unless the protection levels/expiries for the given title
 791          * have already been retrieved
 792          *
 793          * @param Parser $parser
 794          * @param string $type
 795          * @param string $title
 796          *
 797          * @return string
 798          */
 799         public static function protectionlevel( $parser, $type = '', $title = '' ) {
 800                 $titleObject = Title::newFromText( $title );
 801                 if ( !( $titleObject instanceof Title ) ) {
 802                         $titleObject = $parser->mTitle;
 803                 }
 804                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 805                         $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 806                         # Title::getRestrictions returns an array, its possible it may have
 807                         # multiple values in the future
 808                         return implode( $restrictions, ',' );
 809                 }
 810                 return '';
 811         }
 812
 813         /**
 814          * Returns the requested protection expiry for the current page. This
 815          * is an expensive parser function and can't be called too many times
 816          * per page, unless the protection levels/expiries for the given title
 817          * have already been retrieved
 818          *
 819          * @param Parser $parser
 820          * @param string $type
 821          * @param string $title
 822          *
 823          * @return string
 824          */
 825         public static function protectionexpiry( $parser, $type = '', $title = '' ) {
 826                 $titleObject = Title::newFromText( $title );
 827                 if ( !( $titleObject instanceof Title ) ) {
 828                         $titleObject = $parser->mTitle;
 829                 }
 830                 if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
 831                         $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
 832                         // getRestrictionExpiry() returns false on invalid type; trying to
 833                         // match protectionlevel() function that returns empty string instead
 834                         if ( $expiry === false ) {
 835                                 $expiry = '';
 836                         }
 837                         return $expiry;
 838                 }
 839                 return '';
 840         }
 841
 842         /**
 843          * Gives language names.
 844          * @param Parser $parser
 845          * @param string $code Language code (of which to get name)
 846          * @param string $inLanguage Language code (in which to get name)
 847          * @return string
 848          */
 849         public static function language( $parser, $code = '', $inLanguage = '' ) {
 850                 $code = strtolower( $code );
 851                 $inLanguage = strtolower( $inLanguage );
 852                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 853                 return $lang !== '' ? $lang : wfBCP47( $code );
 854         }
 855
 856         /**
 857          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 858          * @param Parser $parser
 859          * @param string $string
 860          * @param int $length
 861          * @param string $padding
 862          * @param int $direction
 863          * @return string
 864          */
 865         public static function pad(
 866                 $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
 867         ) {
 868                 $padding = $parser->killMarkers( $padding );
 869                 $lengthOfPadding = mb_strlen( $padding );
 870                 if ( $lengthOfPadding == 0 ) {
 871                         return $string;
 872                 }
 873
 874                 # The remaining length to add counts down to 0 as padding is added
 875                 $length = min( $length, 500 ) - mb_strlen( $string );
 876                 # $finalPadding is just $padding repeated enough times so that
 877                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 878                 $finalPadding = '';
 879                 while ( $length > 0 ) {
 880                         # If $length < $lengthofPadding, truncate $padding so we get the
 881                         # exact length desired.
 882                         $finalPadding .= mb_substr( $padding, 0, $length );
 883                         $length -= $lengthOfPadding;
 884                 }
 885
 886                 if ( $direction == STR_PAD_LEFT ) {
 887                         return $finalPadding . $string;
 888                 } else {
 889                         return $string . $finalPadding;
 890                 }
 891         }
 892
 893         public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 894                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 895         }
 896
 897         public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 898                 return self::pad( $parser, $string, $length, $padding );
 899         }
 900
 901         /**
 902          * @param Parser $parser
 903          * @param string $text
 904          * @return string
 905          */
 906         public static function anchorencode( $parser, $text ) {
 907                 $text = $parser->killMarkers( $text );
 908                 return (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 909         }
 910
 911         public static function special( $parser, $text ) {
 912                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 913                 if ( $page ) {
 914                         $title = SpecialPage::getTitleFor( $page, $subpage );
 915                         return $title->getPrefixedText();
 916                 } else {
 917                         // unknown special page, just use the given text as its title, if at all possible
 918                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 919                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 920                 }
 921         }
 922
 923         public static function speciale( $parser, $text ) {
 924                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 925         }
 926
 927         /**
 928          * @param Parser $parser
 929          * @param string $text The sortkey to use
 930          * @param string $uarg Either "noreplace" or "noerror" (in en)
 931          *   both suppress errors, and noreplace does nothing if
 932          *   a default sortkey already exists.
 933          * @return string
 934          */
 935         public static function defaultsort( $parser, $text, $uarg = '' ) {
 936                 static $magicWords = null;
 937                 if ( is_null( $magicWords ) ) {
 938                         $magicWords = new MagicWordArray( [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
 939                 }
 940                 $arg = $magicWords->matchStartToEnd( $uarg );
 941
 942                 $text = trim( $text );
 943                 if ( strlen( $text ) == 0 ) {
 944                         return '';
 945                 }
 946                 $old = $parser->getCustomDefaultSort();
 947                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 948                         $parser->setDefaultSort( $text );
 949                 }
 950
 951                 if ( $old === false || $old == $text || $arg ) {
 952                         return '';
 953                 } else {
 954                         $converter = $parser->getConverterLanguage()->getConverter();
 955                         return '<span class="error">' .
 956                                 wfMessage( 'duplicate-defaultsort',
 957                                         // Message should be parsed, but these params should only be escaped.
 958                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 959                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 960                                 )->inContentLanguage()->text() .
 961                                 '</span>';
 962                 }
 963         }
 964
 965         /**
 966          * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
 967          * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
 968          * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
 969          *
 970          * @param Parser $parser
 971          * @param string $name
 972          * @param string $argA
 973          * @param string $argB
 974          * @return array|string
 975          */
 976         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
 977                 $file = wfFindFile( $name );
 978
 979                 if ( $argA == 'nowiki' ) {
 980                         // {{filepath: | option [| size] }}
 981                         $isNowiki = true;
 982                         $parsedWidthParam = $parser->parseWidthParam( $argB );
 983                 } else {
 984                         // {{filepath: [| size [|option]] }}
 985                         $parsedWidthParam = $parser->parseWidthParam( $argA );
 986                         $isNowiki = ( $argB == 'nowiki' );
 987                 }
 988
 989                 if ( $file ) {
 990                         $url = $file->getFullUrl();
 991
 992                         // If a size is requested...
 993                         if ( count( $parsedWidthParam ) ) {
 994                                 $mto = $file->transform( $parsedWidthParam );
 995                                 // ... and we can
 996                                 if ( $mto && !$mto->isError() ) {
 997                                         // ... change the URL to point to a thumbnail.
 998                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
 999                                 }
1000                         }
1001                         if ( $isNowiki ) {
1002                                 return [ $url, 'nowiki' => true ];
1003                         }
1004                         return $url;
1005                 } else {
1006                         return '';
1007                 }
1008         }
1009
1010         /**
1011          * Parser function to extension tag adaptor
1012          * @param Parser $parser
1013          * @param PPFrame $frame
1014          * @param PPNode[] $args
1015          * @return string
1016          */
1017         public static function tagObj( $parser, $frame, $args ) {
1018                 if ( !count( $args ) ) {
1019                         return '';
1020                 }
1021                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
1022
1023                 if ( count( $args ) ) {
1024                         $inner = $frame->expand( array_shift( $args ) );
1025                 } else {
1026                         $inner = null;
1027                 }
1028
1029                 $attributes = [];
1030                 foreach ( $args as $arg ) {
1031                         $bits = $arg->splitArg();
1032                         if ( strval( $bits['index'] ) === '' ) {
1033                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1034                                 $value = trim( $frame->expand( $bits['value'] ) );
1035                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
1036                                         $value = isset( $m[1] ) ? $m[1] : '';
1037                                 }
1038                                 $attributes[$name] = $value;
1039                         }
1040                 }
1041
1042                 $stripList = $parser->getStripList();
1043                 if ( !in_array( $tagName, $stripList ) ) {
1044                         // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
1045                         $attrText = '';
1046                         foreach ( $attributes as $name => $value ) {
1047                                 $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
1048                         }
1049                         if ( $inner === null ) {
1050                                 return "<$tagName$attrText/>";
1051                         }
1052                         return "<$tagName$attrText>$inner</$tagName>";
1053                 }
1054
1055                 $params = [
1056                         'name' => $tagName,
1057                         'inner' => $inner,
1058                         'attributes' => $attributes,
1059                         'close' => "</$tagName>",
1060                 ];
1061                 return $parser->extensionSubstitution( $params, $frame );
1062         }
1063
1064         /**
1065          * Fetched the current revision of the given title and return this.
1066          * Will increment the expensive function count and
1067          * add a template link to get the value refreshed on changes.
1068          * For a given title, which is equal to the current parser title,
1069          * the revision object from the parser is used, when that is the current one
1070          *
1071          * @param Parser $parser
1072          * @param Title $title
1073          * @return Revision
1074          * @since 1.23
1075          */
1076         private static function getCachedRevisionObject( $parser, $title = null ) {
1077                 if ( is_null( $title ) ) {
1078                         return null;
1079                 }
1080
1081                 // Use the revision from the parser itself, when param is the current page
1082                 // and the revision is the current one
1083                 if ( $title->equals( $parser->getTitle() ) ) {
1084                         $parserRev = $parser->getRevisionObject();
1085                         if ( $parserRev && $parserRev->isCurrent() ) {
1086                                 // force reparse after edit with vary-revision flag
1087                                 $parser->getOutput()->setFlag( 'vary-revision' );
1088                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
1089                                 return $parserRev;
1090                         }
1091                 }
1092
1093                 // Normalize name for cache
1094                 $page = $title->getPrefixedDBkey();
1095
1096                 if ( !( $parser->currentRevisionCache && $parser->currentRevisionCache->has( $page ) )
1097                         && !$parser->incrementExpensiveFunctionCount() ) {
1098                         return null;
1099                 }
1100                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
1101                 $pageID = $rev ? $rev->getPage() : 0;
1102                 $revID = $rev ? $rev->getId() : 0;
1103
1104                 // Register dependency in templatelinks
1105                 $parser->getOutput()->addTemplate( $title, $pageID, $revID );
1106
1107                 return $rev;
1108         }
1109
1110         /**
1111          * Get the pageid of a specified page
1112          * @param Parser $parser
1113          * @param string $title Title to get the pageid from
1114          * @return int|null|string
1115          * @since 1.23
1116          */
1117         public static function pageid( $parser, $title = null ) {
1118                 $t = Title::newFromText( $title );
1119                 if ( is_null( $t ) ) {
1120                         return '';
1121                 }
1122                 // Use title from parser to have correct pageid after edit
1123                 if ( $t->equals( $parser->getTitle() ) ) {
1124                         $t = $parser->getTitle();
1125                         return $t->getArticleID();
1126                 }
1127
1128                 // These can't have ids
1129                 if ( !$t->canExist() || $t->isExternal() ) {
1130                         return 0;
1131                 }
1132
1133                 // Check the link cache, maybe something already looked it up.
1134                 $linkCache = LinkCache::singleton();
1135                 $pdbk = $t->getPrefixedDBkey();
1136                 $id = $linkCache->getGoodLinkID( $pdbk );
1137                 if ( $id != 0 ) {
1138                         $parser->mOutput->addLink( $t, $id );
1139                         return $id;
1140                 }
1141                 if ( $linkCache->isBadLink( $pdbk ) ) {
1142                         $parser->mOutput->addLink( $t, 0 );
1143                         return $id;
1144                 }
1145
1146                 // We need to load it from the DB, so mark expensive
1147                 if ( $parser->incrementExpensiveFunctionCount() ) {
1148                         $id = $t->getArticleID();
1149                         $parser->mOutput->addLink( $t, $id );
1150                         return $id;
1151                 }
1152                 return null;
1153         }
1154
1155         /**
1156          * Get the id from the last revision of a specified page.
1157          * @param Parser $parser
1158          * @param string $title Title to get the id from
1159          * @return int|null|string
1160          * @since 1.23
1161          */
1162         public static function revisionid( $parser, $title = null ) {
1163                 $t = Title::newFromText( $title );
1164                 if ( is_null( $t ) ) {
1165                         return '';
1166                 }
1167                 // fetch revision from cache/database and return the value
1168                 $rev = self::getCachedRevisionObject( $parser, $t );
1169                 return $rev ? $rev->getId() : '';
1170         }
1171
1172         /**
1173          * Get the day from the last revision of a specified page.
1174          * @param Parser $parser
1175          * @param string $title Title to get the day from
1176          * @return string
1177          * @since 1.23
1178          */
1179         public static function revisionday( $parser, $title = null ) {
1180                 $t = Title::newFromText( $title );
1181                 if ( is_null( $t ) ) {
1182                         return '';
1183                 }
1184                 // fetch revision from cache/database and return the value
1185                 $rev = self::getCachedRevisionObject( $parser, $t );
1186                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1187         }
1188
1189         /**
1190          * Get the day with leading zeros from the last revision of a specified page.
1191          * @param Parser $parser
1192          * @param string $title Title to get the day from
1193          * @return string
1194          * @since 1.23
1195          */
1196         public static function revisionday2( $parser, $title = null ) {
1197                 $t = Title::newFromText( $title );
1198                 if ( is_null( $t ) ) {
1199                         return '';
1200                 }
1201                 // fetch revision from cache/database and return the value
1202                 $rev = self::getCachedRevisionObject( $parser, $t );
1203                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1204         }
1205
1206         /**
1207          * Get the month with leading zeros from the last revision of a specified page.
1208          * @param Parser $parser
1209          * @param string $title Title to get the month from
1210          * @return string
1211          * @since 1.23
1212          */
1213         public static function revisionmonth( $parser, $title = null ) {
1214                 $t = Title::newFromText( $title );
1215                 if ( is_null( $t ) ) {
1216                         return '';
1217                 }
1218                 // fetch revision from cache/database and return the value
1219                 $rev = self::getCachedRevisionObject( $parser, $t );
1220                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1221         }
1222
1223         /**
1224          * Get the month from the last revision of a specified page.
1225          * @param Parser $parser
1226          * @param string $title Title to get the month from
1227          * @return string
1228          * @since 1.23
1229          */
1230         public static function revisionmonth1( $parser, $title = null ) {
1231                 $t = Title::newFromText( $title );
1232                 if ( is_null( $t ) ) {
1233                         return '';
1234                 }
1235                 // fetch revision from cache/database and return the value
1236                 $rev = self::getCachedRevisionObject( $parser, $t );
1237                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1238         }
1239
1240         /**
1241          * Get the year from the last revision of a specified page.
1242          * @param Parser $parser
1243          * @param string $title Title to get the year from
1244          * @return string
1245          * @since 1.23
1246          */
1247         public static function revisionyear( $parser, $title = null ) {
1248                 $t = Title::newFromText( $title );
1249                 if ( is_null( $t ) ) {
1250                         return '';
1251                 }
1252                 // fetch revision from cache/database and return the value
1253                 $rev = self::getCachedRevisionObject( $parser, $t );
1254                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1255         }
1256
1257         /**
1258          * Get the timestamp from the last revision of a specified page.
1259          * @param Parser $parser
1260          * @param string $title Title to get the timestamp from
1261          * @return string
1262          * @since 1.23
1263          */
1264         public static function revisiontimestamp( $parser, $title = null ) {
1265                 $t = Title::newFromText( $title );
1266                 if ( is_null( $t ) ) {
1267                         return '';
1268                 }
1269                 // fetch revision from cache/database and return the value
1270                 $rev = self::getCachedRevisionObject( $parser, $t );
1271                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1272         }
1273
1274         /**
1275          * Get the user from the last revision of a specified page.
1276          * @param Parser $parser
1277          * @param string $title Title to get the user from
1278          * @return string
1279          * @since 1.23
1280          */
1281         public static function revisionuser( $parser, $title = null ) {
1282                 $t = Title::newFromText( $title );
1283                 if ( is_null( $t ) ) {
1284                         return '';
1285                 }
1286                 // fetch revision from cache/database and return the value
1287                 $rev = self::getCachedRevisionObject( $parser, $t );
1288                 return $rev ? $rev->getUserText() : '';
1289         }
1290
1291         /**
1292          * Returns the sources of any cascading protection acting on a specified page.
1293          * Pages will not return their own title unless they transclude themselves.
1294          * This is an expensive parser function and can't be called too many times per page,
1295          * unless cascading protection sources for the page have already been loaded.
1296          *
1297          * @param Parser $parser
1298          * @param string $title
1299          *
1300          * @return string
1301          * @since 1.23
1302          */
1303         public static function cascadingsources( $parser, $title = '' ) {
1304                 $titleObject = Title::newFromText( $title );
1305                 if ( !( $titleObject instanceof Title ) ) {
1306                         $titleObject = $parser->mTitle;
1307                 }
1308                 if ( $titleObject->areCascadeProtectionSourcesLoaded()
1309                         || $parser->incrementExpensiveFunctionCount()
1310                 ) {
1311                         $names = [];
1312                         $sources = $titleObject->getCascadeProtectionSources();
1313                         foreach ( $sources[0] as $sourceTitle ) {
1314                                 $names[] = $sourceTitle->getPrefixedText();
1315                         }
1316                         return implode( $names, '|' );
1317                 }
1318                 return '';
1319         }
1320
1321 }