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
  24 /**
  25  * Various core parser functions, registered in Parser::firstCallInit()
  26  * @ingroup Parser
  27  */
  28 class CoreParserFunctions {
  29         /**
  30          * @param $parser Parser
  31          * @return void
  32          */
  33         static function register( $parser ) {
  34                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  35
  36                 # Syntax for arguments (see self::setFunctionHook):
  37                 #  "name for lookup in localized magic words array",
  38                 #  function callback,
  39                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}}
  40                 #    instead of {{#int:...}})
  41                 $noHashFunctions = array(
  42                         'ns', 'nse', 'urlencode', 'lcfirst', 'ucfirst', 'lc', 'uc',
  43                         'localurl', 'localurle', 'fullurl', 'fullurle', 'canonicalurl',
  44                         'canonicalurle', 'formatnum', 'grammar', 'gender', 'plural',
  45                         'numberofpages', 'numberofusers', 'numberofactiveusers',
  46                         'numberofarticles', 'numberoffiles', 'numberofadmins',
  47                         'numberingroup', 'numberofedits', 'numberofviews', 'language',
  48                         'padleft', 'padright', 'anchorencode', 'defaultsort', 'filepath',
  49                         'pagesincategory', 'pagesize', 'protectionlevel',
  50                         'namespacee', 'namespacenumber', 'talkspace', 'talkspacee',
  51                         'subjectspace', 'subjectspacee', 'pagename', 'pagenamee',
  52                         'fullpagename', 'fullpagenamee', 'rootpagename', 'rootpagenamee',
  53                         'basepagename', 'basepagenamee', 'subpagename', 'subpagenamee',
  54                         'talkpagename', 'talkpagenamee', 'subjectpagename',
  55                         'subjectpagenamee', 'pageid', 'revisionid', 'revisionday',
  56                         'revisionday2', 'revisionmonth', 'revisionmonth1', 'revisionyear',
  57                         'revisiontimestamp', 'revisionuser', 'cascadingsources',
  58                 );
  59                 foreach ( $noHashFunctions as $func ) {
  60                         $parser->setFunctionHook( $func, array( __CLASS__, $func ), SFH_NO_HASH );
  61                 }
  62
  63                 $parser->setFunctionHook( 'namespace',  array( __CLASS__, 'mwnamespace' ), SFH_NO_HASH );
  64                 $parser->setFunctionHook( 'int',        array( __CLASS__, 'intFunction' ), SFH_NO_HASH );
  65                 $parser->setFunctionHook( 'special',    array( __CLASS__, 'special'     ) );
  66                 $parser->setFunctionHook( 'speciale',   array( __CLASS__, 'speciale'    ) );
  67                 $parser->setFunctionHook( 'tag',        array( __CLASS__, 'tagObj'      ), SFH_OBJECT_ARGS );
  68                 $parser->setFunctionHook( 'formatdate', array( __CLASS__, 'formatDate'  ) );
  69
  70                 if ( $wgAllowDisplayTitle ) {
  71                         $parser->setFunctionHook( 'displaytitle', array( __CLASS__, 'displaytitle' ), SFH_NO_HASH );
  72                 }
  73                 if ( $wgAllowSlowParserFunctions ) {
  74                         $parser->setFunctionHook( 'pagesinnamespace', array( __CLASS__, 'pagesinnamespace' ), SFH_NO_HASH );
  75                 }
  76         }
  77
  78         /**
  79          * @param $parser Parser
  80          * @param string $part1
  81          * @return array
  82          */
  83         static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  84                 if ( strval( $part1 ) !== '' ) {
  85                         $args = array_slice( func_get_args(), 2 );
  86                         $message = wfMessage( $part1, $args )->inLanguage( $parser->getOptions()->getUserLangObj() )->plain();
  87                         return array( $message, 'noparse' => false );
  88                 } else {
  89                         return array( 'found' => false );
  90                 }
  91         }
  92
  93         /**
  94          * @param $parser Parser
  95          * @param  $date
  96          * @param null $defaultPref
  97          * @return mixed|string
  98          */
  99         static function formatDate( $parser, $date, $defaultPref = null ) {
 100                 $lang = $parser->getFunctionLang();
 101                 $df = DateFormatter::getInstance( $lang );
 102
 103                 $date = trim( $date );
 104
 105                 $pref = $parser->getOptions()->getDateFormat();
 106
 107                 // Specify a different default date format other than the the normal default
 108                 // if the user has 'default' for their setting
 109                 if ( $pref == 'default' && $defaultPref ) {
 110                         $pref = $defaultPref;
 111                 }
 112
 113                 $date = $df->reformat( $pref, $date, array( 'match-whole' ) );
 114                 return $date;
 115         }
 116
 117         static function ns( $parser, $part1 = '' ) {
 118                 global $wgContLang;
 119                 if ( intval( $part1 ) || $part1 == "0" ) {
 120                         $index = intval( $part1 );
 121                 } else {
 122                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 123                 }
 124                 if ( $index !== false ) {
 125                         return $wgContLang->getFormattedNsText( $index );
 126                 } else {
 127                         return array( 'found' => false );
 128                 }
 129         }
 130
 131         static function nse( $parser, $part1 = '' ) {
 132                 $ret = self::ns( $parser, $part1 );
 133                 if ( is_string( $ret ) ) {
 134                         $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
 135                 }
 136                 return $ret;
 137         }
 138
 139         /**
 140          * urlencodes a string according to one of three patterns: (bug 22474)
 141          *
 142          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 143          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 144          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 145          *
 146          * @param $parser Parser object
 147          * @param string $s The text to encode.
 148          * @param string $arg (optional): The type of encoding.
 149          * @return string
 150          */
 151         static function urlencode( $parser, $s = '', $arg = null ) {
 152                 static $magicWords = null;
 153                 if ( is_null( $magicWords ) ) {
 154                         $magicWords = new MagicWordArray( array( 'url_path', 'url_query', 'url_wiki' ) );
 155                 }
 156                 switch ( $magicWords->matchStartToEnd( $arg ) ) {
 157
 158                         // Encode as though it's a wiki page, '_' for ' '.
 159                         case 'url_wiki':
 160                                 $func = 'wfUrlencode';
 161                                 $s = str_replace( ' ', '_', $s );
 162                                 break;
 163
 164                         // Encode for an HTTP Path, '%20' for ' '.
 165                         case 'url_path':
 166                                 $func = 'rawurlencode';
 167                                 break;
 168
 169                         // Encode for HTTP query, '+' for ' '.
 170                         case 'url_query':
 171                         default:
 172                                 $func = 'urlencode';
 173                 }
 174                 return $parser->markerSkipCallback( $s, $func );
 175         }
 176
 177         static function lcfirst( $parser, $s = '' ) {
 178                 global $wgContLang;
 179                 return $wgContLang->lcfirst( $s );
 180         }
 181
 182         static function ucfirst( $parser, $s = '' ) {
 183                 global $wgContLang;
 184                 return $wgContLang->ucfirst( $s );
 185         }
 186
 187         /**
 188          * @param $parser Parser
 189          * @param string $s
 190          * @return
 191          */
 192         static function lc( $parser, $s = '' ) {
 193                 global $wgContLang;
 194                 return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
 195         }
 196
 197         /**
 198          * @param $parser Parser
 199          * @param string $s
 200          * @return
 201          */
 202         static function uc( $parser, $s = '' ) {
 203                 global $wgContLang;
 204                 return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
 205         }
 206
 207         static function localurl( $parser, $s = '', $arg = null ) {
 208                 return self::urlFunction( 'getLocalURL', $s, $arg );
 209         }
 210
 211         static function localurle( $parser, $s = '', $arg = null ) {
 212                 return htmlspecialchars( self::urlFunction( 'getLocalURL', $s, $arg ) );
 213         }
 214
 215         static function fullurl( $parser, $s = '', $arg = null ) {
 216                 return self::urlFunction( 'getFullURL', $s, $arg );
 217         }
 218
 219         static function fullurle( $parser, $s = '', $arg = null ) {
 220                 return htmlspecialchars( self::urlFunction( 'getFullURL', $s, $arg ) );
 221         }
 222
 223         static function canonicalurl( $parser, $s = '', $arg = null ) {
 224                 return self::urlFunction( 'getCanonicalURL', $s, $arg );
 225         }
 226
 227         static function canonicalurle( $parser, $s = '', $arg = null ) {
 228                 return self::urlFunction( 'escapeCanonicalURL', $s, $arg );
 229         }
 230
 231         static function urlFunction( $func, $s = '', $arg = null ) {
 232                 $title = Title::newFromText( $s );
 233                 # Due to order of execution of a lot of bits, the values might be encoded
 234                 # before arriving here; if that's true, then the title can't be created
 235                 # and the variable will fail. If we can't get a decent title from the first
 236                 # attempt, url-decode and try for a second.
 237                 if ( is_null( $title ) ) {
 238                         $title = Title::newFromURL( urldecode( $s ) );
 239                 }
 240                 if ( !is_null( $title ) ) {
 241                         # Convert NS_MEDIA -> NS_FILE
 242                         if ( $title->getNamespace() == NS_MEDIA ) {
 243                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 244                         }
 245                         if ( !is_null( $arg ) ) {
 246                                 $text = $title->$func( $arg );
 247                         } else {
 248                                 $text = $title->$func();
 249                         }
 250                         return $text;
 251                 } else {
 252                         return array( 'found' => false );
 253                 }
 254         }
 255
 256         /**
 257          * @param $parser Parser
 258          * @param string $num
 259          * @param string $arg
 260          * @return string
 261          */
 262         static function formatnum( $parser, $num = '', $arg = null ) {
 263                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg ) ) {
 264                         $func = array( $parser->getFunctionLang(), 'parseFormattedNumber' );
 265                 } elseif ( self::matchAgainstMagicword( 'nocommafysuffix', $arg ) ) {
 266                         $func = array( $parser->getFunctionLang(), 'formatNumNoSeparators' );
 267                 } else {
 268                         $func = array( $parser->getFunctionLang(), 'formatNum' );
 269                 }
 270                 return $parser->markerSkipCallback( $num, $func );
 271         }
 272
 273         /**
 274          * @param $parser Parser
 275          * @param string $case
 276          * @param string $word
 277          * @return
 278          */
 279         static function grammar( $parser, $case = '', $word = '' ) {
 280                 $word = $parser->killMarkers( $word );
 281                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 282         }
 283
 284         /**
 285          * @param $parser Parser
 286          * @param $username string
 287          * @return
 288          */
 289         static function gender( $parser, $username ) {
 290                 wfProfileIn( __METHOD__ );
 291                 $forms = array_slice( func_get_args(), 2 );
 292
 293                 // Some shortcuts to avoid loading user data unnecessarily
 294                 if ( count( $forms ) === 0 ) {
 295                         wfProfileOut( __METHOD__ );
 296                         return '';
 297                 } elseif ( count( $forms ) === 1 ) {
 298                         wfProfileOut( __METHOD__ );
 299                         return $forms[0];
 300                 }
 301
 302                 $username = trim( $username );
 303
 304                 // default
 305                 $gender = User::getDefaultOption( 'gender' );
 306
 307                 // allow prefix.
 308                 $title = Title::newFromText( $username );
 309
 310                 if ( $title && $title->getNamespace() == NS_USER ) {
 311                         $username = $title->getText();
 312                 }
 313
 314                 // check parameter, or use the ParserOptions if in interface message
 315                 $user = User::newFromName( $username );
 316                 if ( $user ) {
 317                         $gender = GenderCache::singleton()->getGenderOf( $user, __METHOD__ );
 318                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 319                         $gender = GenderCache::singleton()->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
 320                 }
 321                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 322                 wfProfileOut( __METHOD__ );
 323                 return $ret;
 324         }
 325
 326         /**
 327          * @param $parser Parser
 328          * @param string $text
 329          * @return
 330          */
 331         static function plural( $parser, $text = '' ) {
 332                 $forms = array_slice( func_get_args(), 2 );
 333                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 334                 settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
 335                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 336         }
 337
 338         /**
 339          * Override the title of the page when viewed, provided we've been given a
 340          * title which will normalise to the canonical title
 341          *
 342          * @param $parser Parser: parent parser
 343          * @param string $text desired title text
 344          * @return String
 345          */
 346         static function displaytitle( $parser, $text = '' ) {
 347                 global $wgRestrictDisplayTitle;
 348
 349                 // parse a limited subset of wiki markup (just the single quote items)
 350                 $text = $parser->doQuotes( $text );
 351
 352                 // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 353                 $text = preg_replace( '/' . preg_quote( $parser->uniqPrefix(), '/' ) . '.*?'
 354                         . preg_quote( Parser::MARKER_SUFFIX, '/' ) . '/', '', $text );
 355
 356                 // list of disallowed tags for DISPLAYTITLE
 357                 // these will be escaped even though they are allowed in normal wiki text
 358                 $bad = array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 359                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rp', 'br' );
 360
 361                 // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 362                 if ( $wgRestrictDisplayTitle ) {
 363                         $htmlTagsCallback = function ( &$params ) {
 364                                 $decoded = Sanitizer::decodeTagAttributes( $params );
 365
 366                                 if ( isset( $decoded['style'] ) ) {
 367                                         // this is called later anyway, but we need it right now for the regexes below to be safe
 368                                         // calling it twice doesn't hurt
 369                                         $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );
 370
 371                                         if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
 372                                                 $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
 373                                         }
 374                                 }
 375
 376                                 $params = Sanitizer::safeEncodeTagAttributes( $decoded );
 377                         };
 378                 } else {
 379                         $htmlTagsCallback = null;
 380                 }
 381
 382                 // only requested titles that normalize to the actual title are allowed through
 383                 // if $wgRestrictDisplayTitle is true (it is by default)
 384                 // mimic the escaping process that occurs in OutputPage::setPageTitle
 385                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $text, $htmlTagsCallback, array(), array(), $bad ) );
 386                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 387
 388                 if ( !$wgRestrictDisplayTitle ) {
 389                         $parser->mOutput->setDisplayTitle( $text );
 390                 } elseif ( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) ) {
 391                         $parser->mOutput->setDisplayTitle( $text );
 392                 }
 393
 394                 return '';
 395         }
 396
 397         /**
 398          * Matches the given value against the value of given magic word
 399          *
 400          * @param string $magicword magic word key
 401          * @param mixed $value value to match
 402          * @return boolean true on successful match
 403          */
 404         private static function matchAgainstMagicword( $magicword, $value ) {
 405                 if ( strval( $value ) === '' ) {
 406                         return false;
 407                 }
 408                 $mwObject = MagicWord::get( $magicword );
 409                 return $mwObject->match( $value );
 410         }
 411
 412         static function formatRaw( $num, $raw ) {
 413                 if ( self::matchAgainstMagicword( 'rawsuffix', $raw ) ) {
 414                         return $num;
 415                 } else {
 416                         global $wgContLang;
 417                         return $wgContLang->formatNum( $num );
 418                 }
 419         }
 420         static function numberofpages( $parser, $raw = null ) {
 421                 return self::formatRaw( SiteStats::pages(), $raw );
 422         }
 423         static function numberofusers( $parser, $raw = null ) {
 424                 return self::formatRaw( SiteStats::users(), $raw );
 425         }
 426         static function numberofactiveusers( $parser, $raw = null ) {
 427                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 428         }
 429         static function numberofarticles( $parser, $raw = null ) {
 430                 return self::formatRaw( SiteStats::articles(), $raw );
 431         }
 432         static function numberoffiles( $parser, $raw = null ) {
 433                 return self::formatRaw( SiteStats::images(), $raw );
 434         }
 435         static function numberofadmins( $parser, $raw = null ) {
 436                 return self::formatRaw( SiteStats::numberingroup( 'sysop' ), $raw );
 437         }
 438         static function numberofedits( $parser, $raw = null ) {
 439                 return self::formatRaw( SiteStats::edits(), $raw );
 440         }
 441         static function numberofviews( $parser, $raw = null ) {
 442                 global $wgDisableCounters;
 443                 return !$wgDisableCounters ? self::formatRaw( SiteStats::views(), $raw ) : '';
 444         }
 445         static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 446                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 447         }
 448         static function numberingroup( $parser, $name = '', $raw = null ) {
 449                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 450         }
 451
 452         /**
 453          * Given a title, return the namespace name that would be given by the
 454          * corresponding magic word
 455          * Note: function name changed to "mwnamespace" rather than "namespace"
 456          * to not break PHP 5.3
 457          * @return mixed|string
 458          */
 459         static function mwnamespace( $parser, $title = null ) {
 460                 $t = Title::newFromText( $title );
 461                 if ( is_null( $t ) ) {
 462                         return '';
 463                 }
 464                 return str_replace( '_', ' ', $t->getNsText() );
 465         }
 466         static function namespacee( $parser, $title = null ) {
 467                 $t = Title::newFromText( $title );
 468                 if ( is_null( $t ) ) {
 469                         return '';
 470                 }
 471                 return wfUrlencode( $t->getNsText() );
 472         }
 473         static function namespacenumber( $parser, $title = null ) {
 474                 $t = Title::newFromText( $title );
 475                 if ( is_null( $t ) ) {
 476                         return '';
 477                 }
 478                 return $t->getNamespace();
 479         }
 480         static function talkspace( $parser, $title = null ) {
 481                 $t = Title::newFromText( $title );
 482                 if ( is_null( $t ) || !$t->canTalk() ) {
 483                         return '';
 484                 }
 485                 return str_replace( '_', ' ', $t->getTalkNsText() );
 486         }
 487         static function talkspacee( $parser, $title = null ) {
 488                 $t = Title::newFromText( $title );
 489                 if ( is_null( $t ) || !$t->canTalk() ) {
 490                         return '';
 491                 }
 492                 return wfUrlencode( $t->getTalkNsText() );
 493         }
 494         static function subjectspace( $parser, $title = null ) {
 495                 $t = Title::newFromText( $title );
 496                 if ( is_null( $t ) ) {
 497                         return '';
 498                 }
 499                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 500         }
 501         static function subjectspacee( $parser, $title = null ) {
 502                 $t = Title::newFromText( $title );
 503                 if ( is_null( $t ) ) {
 504                         return '';
 505                 }
 506                 return wfUrlencode( $t->getSubjectNsText() );
 507         }
 508
 509         /**
 510          * Functions to get and normalize pagenames, corresponding to the magic words
 511          * of the same names
 512          * @return String
 513          */
 514         static function pagename( $parser, $title = null ) {
 515                 $t = Title::newFromText( $title );
 516                 if ( is_null( $t ) ) {
 517                         return '';
 518                 }
 519                 return wfEscapeWikiText( $t->getText() );
 520         }
 521         static function pagenamee( $parser, $title = null ) {
 522                 $t = Title::newFromText( $title );
 523                 if ( is_null( $t ) ) {
 524                         return '';
 525                 }
 526                 return wfEscapeWikiText( $t->getPartialURL() );
 527         }
 528         static function fullpagename( $parser, $title = null ) {
 529                 $t = Title::newFromText( $title );
 530                 if ( is_null( $t ) || !$t->canTalk() ) {
 531                         return '';
 532                 }
 533                 return wfEscapeWikiText( $t->getPrefixedText() );
 534         }
 535         static function fullpagenamee( $parser, $title = null ) {
 536                 $t = Title::newFromText( $title );
 537                 if ( is_null( $t ) || !$t->canTalk() ) {
 538                         return '';
 539                 }
 540                 return wfEscapeWikiText( $t->getPrefixedURL() );
 541         }
 542         static function subpagename( $parser, $title = null ) {
 543                 $t = Title::newFromText( $title );
 544                 if ( is_null( $t ) ) {
 545                         return '';
 546                 }
 547                 return wfEscapeWikiText( $t->getSubpageText() );
 548         }
 549         static function subpagenamee( $parser, $title = null ) {
 550                 $t = Title::newFromText( $title );
 551                 if ( is_null( $t ) ) {
 552                         return '';
 553                 }
 554                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 555         }
 556         static function rootpagename( $parser, $title = null ) {
 557                 $t = Title::newFromText( $title );
 558                 if ( is_null( $t ) ) {
 559                         return '';
 560                 }
 561                 return wfEscapeWikiText( $t->getRootText() );
 562         }
 563         static function rootpagenamee( $parser, $title = null ) {
 564                 $t = Title::newFromText( $title );
 565                 if ( is_null( $t ) ) {
 566                         return '';
 567                 }
 568                 return wfEscapeWikiText( wfUrlEncode( str_replace( ' ', '_', $t->getRootText() ) ) );
 569         }
 570         static function basepagename( $parser, $title = null ) {
 571                 $t = Title::newFromText( $title );
 572                 if ( is_null( $t ) ) {
 573                         return '';
 574                 }
 575                 return wfEscapeWikiText( $t->getBaseText() );
 576         }
 577         static function basepagenamee( $parser, $title = null ) {
 578                 $t = Title::newFromText( $title );
 579                 if ( is_null( $t ) ) {
 580                         return '';
 581                 }
 582                 return wfEscapeWikiText( wfUrlEncode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 583         }
 584         static function talkpagename( $parser, $title = null ) {
 585                 $t = Title::newFromText( $title );
 586                 if ( is_null( $t ) || !$t->canTalk() ) {
 587                         return '';
 588                 }
 589                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 590         }
 591         static function talkpagenamee( $parser, $title = null ) {
 592                 $t = Title::newFromText( $title );
 593                 if ( is_null( $t ) || !$t->canTalk() ) {
 594                         return '';
 595                 }
 596                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
 597         }
 598         static function subjectpagename( $parser, $title = null ) {
 599                 $t = Title::newFromText( $title );
 600                 if ( is_null( $t ) ) {
 601                         return '';
 602                 }
 603                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 604         }
 605         static function subjectpagenamee( $parser, $title = null ) {
 606                 $t = Title::newFromText( $title );
 607                 if ( is_null( $t ) ) {
 608                         return '';
 609                 }
 610                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
 611         }
 612
 613         /**
 614          * Return the number of pages, files or subcats in the given category,
 615          * or 0 if it's nonexistent. This is an expensive parser function and
 616          * can't be called too many times per page.
 617          * @return string
 618          */
 619         static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
 620                 global $wgContLang;
 621                 static $magicWords = null;
 622                 if ( is_null( $magicWords ) ) {
 623                         $magicWords = new MagicWordArray( array(
 624                                 'pagesincategory_all',
 625                                 'pagesincategory_pages',
 626                                 'pagesincategory_subcats',
 627                                 'pagesincategory_files'
 628                         ) );
 629                 }
 630                 static $cache = array();
 631
 632                 // split the given option to its variable
 633                 if ( self::matchAgainstMagicword( 'rawsuffix', $arg1 ) ) {
 634                         //{{pagesincategory:|raw[|type]}}
 635                         $raw = $arg1;
 636                         $type = $magicWords->matchStartToEnd( $arg2 );
 637                 } else {
 638                         //{{pagesincategory:[|type[|raw]]}}
 639                         $type = $magicWords->matchStartToEnd( $arg1 );
 640                         $raw = $arg2;
 641                 }
 642                 if ( !$type ) { //backward compatibility
 643                         $type = 'pagesincategory_all';
 644                 }
 645
 646                 $title = Title::makeTitleSafe( NS_CATEGORY, $name );
 647                 if ( !$title ) { # invalid title
 648                         return self::formatRaw( 0, $raw );
 649                 }
 650                 $wgContLang->findVariantLink( $name, $title, true );
 651
 652                 // Normalize name for cache
 653                 $name = $title->getDBkey();
 654
 655                 if ( !isset( $cache[$name] ) ) {
 656                         $category = Category::newFromTitle( $title );
 657
 658                         $allCount = $subcatCount = $fileCount = $pagesCount = 0;
 659                         if ( $parser->incrementExpensiveFunctionCount() ) {
 660                                 // $allCount is the total number of cat members,
 661                                 // not the count of how many members are normal pages.
 662                                 $allCount = (int)$category->getPageCount();
 663                                 $subcatCount = (int)$category->getSubcatCount();
 664                                 $fileCount = (int)$category->getFileCount();
 665                                 $pagesCount = $allCount - $subcatCount - $fileCount;
 666                         }
 667                         $cache[$name]['pagesincategory_all'] = $allCount;
 668                         $cache[$name]['pagesincategory_pages'] = $pagesCount;
 669                         $cache[$name]['pagesincategory_subcats'] = $subcatCount;
 670                         $cache[$name]['pagesincategory_files'] = $fileCount;
 671                 }
 672
 673                 $count = $cache[$name][$type];
 674                 return self::formatRaw( $count, $raw );
 675         }
 676
 677         /**
 678          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 679          * expensive parser function and can't be called too many times per page.
 680          *
 681          * @todo FIXME: Title::getLength() documentation claims that it adds things
 682          *   to the link cache, so the local cache here should be unnecessary, but
 683          *   in fact calling getLength() repeatedly for the same $page does seem to
 684          *   run one query for each call?
 685          * @todo Document parameters
 686          *
 687          * @param $parser Parser
 688          * @param $page String Name of page to check (Default: empty string)
 689          * @param $raw String Should number be human readable with commas or just number
 690          * @return string
 691          */
 692         static function pagesize( $parser, $page = '', $raw = null ) {
 693                 $title = Title::newFromText( $page );
 694
 695                 if ( !is_object( $title ) ) {
 696                         return self::formatRaw( 0, $raw );
 697                 }
 698
 699                 // fetch revision from cache/database and return the value
 700                 $rev = self::getCachedRevisionObject( $parser, $title );
 701                 $length = $rev ? $rev->getSize() : 0;
 702                 return self::formatRaw( $length, $raw );
 703         }
 704
 705         /**
 706          * Returns the requested protection level for the current page
 707          *
 708          * @param Parser $parser
 709          * @param string $type
 710          * @param string $title
 711          *
 712          * @return string
 713          */
 714         static function protectionlevel( $parser, $type = '', $title = '' ) {
 715                 $titleObject = Title::newFromText( $title );
 716                 if ( !( $titleObject instanceof Title ) ) {
 717                         $titleObject = $parser->mTitle;
 718                 }
 719                 $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
 720                 # Title::getRestrictions returns an array, its possible it may have
 721                 # multiple values in the future
 722                 return implode( $restrictions, ',' );
 723         }
 724
 725         /**
 726          * Gives language names.
 727          * @param $parser Parser
 728          * @param string $code  Language code (of which to get name)
 729          * @param string $inLanguage  Language code (in which to get name)
 730          * @return String
 731          */
 732         static function language( $parser, $code = '', $inLanguage = '' ) {
 733                 $code = strtolower( $code );
 734                 $inLanguage = strtolower( $inLanguage );
 735                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 736                 return $lang !== '' ? $lang : wfBCP47( $code );
 737         }
 738
 739         /**
 740          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 741          * @return string
 742          */
 743         static function pad( $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT ) {
 744                 $padding = $parser->killMarkers( $padding );
 745                 $lengthOfPadding = mb_strlen( $padding );
 746                 if ( $lengthOfPadding == 0 ) {
 747                         return $string;
 748                 }
 749
 750                 # The remaining length to add counts down to 0 as padding is added
 751                 $length = min( $length, 500 ) - mb_strlen( $string );
 752                 # $finalPadding is just $padding repeated enough times so that
 753                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 754                 $finalPadding = '';
 755                 while ( $length > 0 ) {
 756                         # If $length < $lengthofPadding, truncate $padding so we get the
 757                         # exact length desired.
 758                         $finalPadding .= mb_substr( $padding, 0, $length );
 759                         $length -= $lengthOfPadding;
 760                 }
 761
 762                 if ( $direction == STR_PAD_LEFT ) {
 763                         return $finalPadding . $string;
 764                 } else {
 765                         return $string . $finalPadding;
 766                 }
 767         }
 768
 769         static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 770                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 771         }
 772
 773         static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 774                 return self::pad( $parser, $string, $length, $padding );
 775         }
 776
 777         /**
 778          * @param $parser Parser
 779          * @param  $text
 780          * @return string
 781          */
 782         static function anchorencode( $parser, $text ) {
 783                 $text = $parser->killMarkers( $text );
 784                 return (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
 785         }
 786
 787         static function special( $parser, $text ) {
 788                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 789                 if ( $page ) {
 790                         $title = SpecialPage::getTitleFor( $page, $subpage );
 791                         return $title->getPrefixedText();
 792                 } else {
 793                         // unknown special page, just use the given text as its title, if at all possible
 794                         $title = Title::makeTitleSafe( NS_SPECIAL, $text );
 795                         return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
 796                 }
 797         }
 798
 799         static function speciale( $parser, $text ) {
 800                 return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
 801         }
 802
 803         /**
 804          * @param $parser Parser
 805          * @param string $text The sortkey to use
 806          * @param string $uarg Either "noreplace" or "noerror" (in en)
 807          *   both suppress errors, and noreplace does nothing if
 808          *   a default sortkey already exists.
 809          * @return string
 810          */
 811         public static function defaultsort( $parser, $text, $uarg = '' ) {
 812                 static $magicWords = null;
 813                 if ( is_null( $magicWords ) ) {
 814                         $magicWords = new MagicWordArray( array( 'defaultsort_noerror', 'defaultsort_noreplace' ) );
 815                 }
 816                 $arg = $magicWords->matchStartToEnd( $uarg );
 817
 818                 $text = trim( $text );
 819                 if ( strlen( $text ) == 0 ) {
 820                         return '';
 821                 }
 822                 $old = $parser->getCustomDefaultSort();
 823                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 824                         $parser->setDefaultSort( $text );
 825                 }
 826
 827                 if ( $old === false || $old == $text || $arg ) {
 828                         return '';
 829                 } else {
 830                         $converter = $parser->getConverterLanguage()->getConverter();
 831                         return '<span class="error">' .
 832                                 wfMessage( 'duplicate-defaultsort',
 833                                         // Message should be parsed, but these params should only be escaped.
 834                                         $converter->markNoConversion( wfEscapeWikiText( $old ) ),
 835                                         $converter->markNoConversion( wfEscapeWikiText( $text ) )
 836                                 )->inContentLanguage()->text() .
 837                                 '</span>';
 838                 }
 839         }
 840
 841         // Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}} or {{filepath|300|nowiki}}
 842         // or {{filepath|300px}}, {{filepath|200x300px}}, {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}
 843         public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
 844                 $file = wfFindFile( $name );
 845
 846                 if ( $argA == 'nowiki' ) {
 847                         // {{filepath: | option [| size] }}
 848                         $isNowiki = true;
 849                         $parsedWidthParam = $parser->parseWidthParam( $argB );
 850                 } else {
 851                         // {{filepath: [| size [|option]] }}
 852                         $parsedWidthParam = $parser->parseWidthParam( $argA );
 853                         $isNowiki = ( $argB == 'nowiki' );
 854                 }
 855
 856                 if ( $file ) {
 857                         $url = $file->getFullUrl();
 858
 859                         // If a size is requested...
 860                         if ( count( $parsedWidthParam ) ) {
 861                                 $mto = $file->transform( $parsedWidthParam );
 862                                 // ... and we can
 863                                 if ( $mto && !$mto->isError() ) {
 864                                         // ... change the URL to point to a thumbnail.
 865                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
 866                                 }
 867                         }
 868                         if ( $isNowiki ) {
 869                                 return array( $url, 'nowiki' => true );
 870                         }
 871                         return $url;
 872                 } else {
 873                         return '';
 874                 }
 875         }
 876
 877         /**
 878          * Parser function to extension tag adaptor
 879          * @return string
 880          */
 881         public static function tagObj( $parser, $frame, $args ) {
 882                 if ( !count( $args ) ) {
 883                         return '';
 884                 }
 885                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 886
 887                 if ( count( $args ) ) {
 888                         $inner = $frame->expand( array_shift( $args ) );
 889                 } else {
 890                         $inner = null;
 891                 }
 892
 893                 $stripList = $parser->getStripList();
 894                 if ( !in_array( $tagName, $stripList ) ) {
 895                         return '<span class="error">' .
 896                                 wfMessage( 'unknown_extension_tag', $tagName )->inContentLanguage()->text() .
 897                                 '</span>';
 898                 }
 899
 900                 $attributes = array();
 901                 foreach ( $args as $arg ) {
 902                         $bits = $arg->splitArg();
 903                         if ( strval( $bits['index'] ) === '' ) {
 904                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 905                                 $value = trim( $frame->expand( $bits['value'] ) );
 906                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 907                                         $value = isset( $m[1] ) ? $m[1] : '';
 908                                 }
 909                                 $attributes[$name] = $value;
 910                         }
 911                 }
 912
 913                 $params = array(
 914                         'name' => $tagName,
 915                         'inner' => $inner,
 916                         'attributes' => $attributes,
 917                         'close' => "</$tagName>",
 918                 );
 919                 return $parser->extensionSubstitution( $params, $frame );
 920         }
 921
 922         /**
 923          * Fetched the current revision of the given title and return this.
 924          * Will increment the expensive function count and
 925          * add a template link to get the value refreshed on changes.
 926          * For a given title, which is equal to the current parser title,
 927          * the revision object from the parser is used, when that is the current one
 928          *
 929          * @param $parser Parser
 930          * @param $title Title
 931          * @return Revision
 932          * @since 1.23
 933          */
 934         private static function getCachedRevisionObject( $parser, $title = null ) {
 935                 static $cache = array();
 936
 937                 if ( is_null( $title ) ) {
 938                         return null;
 939                 }
 940
 941                 // Use the revision from the parser itself, when param is the current page
 942                 // and the revision is the current one
 943                 if ( $title->equals( $parser->getTitle() ) ) {
 944                         $parserRev = $parser->getRevisionObject();
 945                         if ( $parserRev && $parserRev->isCurrent() ) {
 946                                 // force reparse after edit with vary-revision flag
 947                                 $parser->getOutput()->setFlag( 'vary-revision' );
 948                                 wfDebug( __METHOD__ . ": use current revision from parser, setting vary-revision...\n" );
 949                                 return $parserRev;
 950                         }
 951                 }
 952
 953                 // Normalize name for cache
 954                 $page = $title->getPrefixedDBkey();
 955
 956                 if ( array_key_exists( $page, $cache ) ) { // cache contains null values
 957                         return $cache[$page];
 958                 }
 959                 if ( $parser->incrementExpensiveFunctionCount() ) {
 960                         $rev = Revision::newFromTitle( $title, false, Revision::READ_NORMAL );
 961                         $pageID = $rev ? $rev->getPage() : 0;
 962                         $revID = $rev ? $rev->getId() : 0;
 963                         $cache[$page] = $rev; // maybe null
 964
 965                         // Register dependency in templatelinks
 966                         $parser->getOutput()->addTemplate( $title, $pageID, $revID );
 967
 968                         return $rev;
 969                 }
 970                 $cache[$page] = null;
 971                 return null;
 972         }
 973
 974         /**
 975          * Get the pageid of a specified page
 976          * @param $parser Parser
 977          * @param $title string Title to get the pageid from
 978          * @since 1.23
 979          */
 980         public static function pageid( $parser, $title = null ) {
 981                 $t = Title::newFromText( $title );
 982                 if ( is_null( $t ) ) {
 983                         return '';
 984                 }
 985                 // Use title from parser to have correct pageid after edit
 986                 if ( $t->equals( $parser->getTitle() ) ) {
 987                         $t = $parser->getTitle();
 988                 }
 989                 // fetch pageid from cache/database and return the value
 990                 $pageid = $t->getArticleID();
 991                 return $pageid ? $pageid : '';
 992         }
 993
 994         /**
 995          * Get the id from the last revision of a specified page.
 996          * @param $parser Parser
 997          * @param $title string Title to get the id from
 998          * @since 1.23
 999          */
1000         public static function revisionid( $parser, $title = null ) {
1001                 $t = Title::newFromText( $title );
1002                 if ( is_null( $t ) ) {
1003                         return '';
1004                 }
1005                 // fetch revision from cache/database and return the value
1006                 $rev = self::getCachedRevisionObject( $parser, $t );
1007                 return $rev ? $rev->getId() : '';
1008         }
1009
1010         /**
1011          * Get the day from the last revision of a specified page.
1012          * @param $parser Parser
1013          * @param $title string Title to get the day from
1014          * @since 1.23
1015          */
1016         public static function revisionday( $parser, $title = null ) {
1017                 $t = Title::newFromText( $title );
1018                 if ( is_null( $t ) ) {
1019                         return '';
1020                 }
1021                 // fetch revision from cache/database and return the value
1022                 $rev = self::getCachedRevisionObject( $parser, $t );
1023                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
1024         }
1025
1026         /**
1027          * Get the day with leading zeros from the last revision of a specified page.
1028          * @param $parser Parser
1029          * @param $title string Title to get the day from
1030          * @since 1.23
1031          */
1032         public static function revisionday2( $parser, $title = null ) {
1033                 $t = Title::newFromText( $title );
1034                 if ( is_null( $t ) ) {
1035                         return '';
1036                 }
1037                 // fetch revision from cache/database and return the value
1038                 $rev = self::getCachedRevisionObject( $parser, $t );
1039                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
1040         }
1041
1042         /**
1043          * Get the month with leading zeros from the last revision of a specified page.
1044          * @param $parser Parser
1045          * @param $title string Title to get the month from
1046          * @since 1.23
1047          */
1048         public static function revisionmonth( $parser, $title = null ) {
1049                 $t = Title::newFromText( $title );
1050                 if ( is_null( $t ) ) {
1051                         return '';
1052                 }
1053                 // fetch revision from cache/database and return the value
1054                 $rev = self::getCachedRevisionObject( $parser, $t );
1055                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
1056         }
1057
1058         /**
1059          * Get the month from the last revision of a specified page.
1060          * @param $parser Parser
1061          * @param $title string Title to get the month from
1062          * @since 1.23
1063          */
1064         public static function revisionmonth1( $parser, $title = null ) {
1065                 $t = Title::newFromText( $title );
1066                 if ( is_null( $t ) ) {
1067                         return '';
1068                 }
1069                 // fetch revision from cache/database and return the value
1070                 $rev = self::getCachedRevisionObject( $parser, $t );
1071                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
1072         }
1073
1074         /**
1075          * Get the year from the last revision of a specified page.
1076          * @param $parser Parser
1077          * @param $title string Title to get the year from
1078          * @since 1.23
1079          */
1080         public static function revisionyear( $parser, $title = null ) {
1081                 $t = Title::newFromText( $title );
1082                 if ( is_null( $t ) ) {
1083                         return '';
1084                 }
1085                 // fetch revision from cache/database and return the value
1086                 $rev = self::getCachedRevisionObject( $parser, $t );
1087                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
1088         }
1089
1090         /**
1091          * Get the timestamp from the last revision of a specified page.
1092          * @param $parser Parser
1093          * @param $title string Title to get the timestamp from
1094          * @since 1.23
1095          */
1096         public static function revisiontimestamp( $parser, $title = null ) {
1097                 $t = Title::newFromText( $title );
1098                 if ( is_null( $t ) ) {
1099                         return '';
1100                 }
1101                 // fetch revision from cache/database and return the value
1102                 $rev = self::getCachedRevisionObject( $parser, $t );
1103                 return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
1104         }
1105
1106         /**
1107          * Get the user from the last revision of a specified page.
1108          * @param $parser Parser
1109          * @param $title string Title to get the user from
1110          * @since 1.23
1111          */
1112         public static function revisionuser( $parser, $title = null ) {
1113                 $t = Title::newFromText( $title );
1114                 if ( is_null( $t ) ) {
1115                         return '';
1116                 }
1117                 // fetch revision from cache/database and return the value
1118                 $rev = self::getCachedRevisionObject( $parser, $t );
1119                 return $rev ? $rev->getUserText() : '';
1120         }
1121
1122         /**
1123          * Returns the sources of any cascading protection acting on a specified page.
1124          * Pages will not return their own title unless they transclude themselves.
1125          * This is an expensive parser function and can't be called too many times per page.
1126          *
1127          * @param Parser $parser
1128          * @param string $title
1129          *
1130          * @return string
1131          * @since 1.23
1132          */
1133         public static function cascadingsources( $parser, $title = '' ) {
1134                 $titleObject = Title::newFromText( $title );
1135                 if ( !( $titleObject instanceof Title ) ) {
1136                         $titleObject = $parser->mTitle;
1137                 }
1138                 $names = array();
1139                 if ( $parser->incrementExpensiveFunctionCount() ) {
1140                         $sources = $titleObject->getCascadeProtectionSources();
1141                         foreach ( $sources[0] as $sourceTitle ) {
1142                                 $names[] = $sourceTitle->getPrefixedText();
1143                         }
1144                 }
1145
1146                 return implode( $names, '|' );
1147         }
1148
1149 }