includes/parser/CoreParserFunctions.php

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