includes/parser/CoreParserFunctions.php

   1 <?php
   2
   3 /**
   4  * Various core parser functions, registered in Parser::firstCallInit()
   5  * @ingroup Parser
   6  */
   7 class CoreParserFunctions {
   8         static function register( $parser ) {
   9                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  10
  11                 # Syntax for arguments (see self::setFunctionHook):
  12                 #  "name for lookup in localized magic words array",
  13                 #  function callback,
  14                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}
  15                 #    instead of {{#int:...}})
  16
  17                 $parser->setFunctionHook( 'int',              array( __CLASS__, 'intFunction'      ), SFH_NO_HASH );
  18                 $parser->setFunctionHook( 'ns',               array( __CLASS__, 'ns'               ), SFH_NO_HASH );
  19                 $parser->setFunctionHook( 'urlencode',        array( __CLASS__, 'urlencode'        ), SFH_NO_HASH );
  20                 $parser->setFunctionHook( 'lcfirst',          array( __CLASS__, 'lcfirst'          ), SFH_NO_HASH );
  21                 $parser->setFunctionHook( 'ucfirst',          array( __CLASS__, 'ucfirst'          ), SFH_NO_HASH );
  22                 $parser->setFunctionHook( 'lc',               array( __CLASS__, 'lc'               ), SFH_NO_HASH );
  23                 $parser->setFunctionHook( 'uc',               array( __CLASS__, 'uc'               ), SFH_NO_HASH );
  24                 $parser->setFunctionHook( 'localurl',         array( __CLASS__, 'localurl'         ), SFH_NO_HASH );
  25                 $parser->setFunctionHook( 'localurle',        array( __CLASS__, 'localurle'        ), SFH_NO_HASH );
  26                 $parser->setFunctionHook( 'fullurl',          array( __CLASS__, 'fullurl'          ), SFH_NO_HASH );
  27                 $parser->setFunctionHook( 'fullurle',         array( __CLASS__, 'fullurle'         ), SFH_NO_HASH );
  28                 $parser->setFunctionHook( 'formatnum',        array( __CLASS__, 'formatnum'        ), SFH_NO_HASH );
  29                 $parser->setFunctionHook( 'grammar',          array( __CLASS__, 'grammar'          ), SFH_NO_HASH );
  30                 $parser->setFunctionHook( 'gender',           array( __CLASS__, 'gender'           ), SFH_NO_HASH );
  31                 $parser->setFunctionHook( 'plural',           array( __CLASS__, 'plural'           ), SFH_NO_HASH );
  32                 $parser->setFunctionHook( 'numberofpages',    array( __CLASS__, 'numberofpages'    ), SFH_NO_HASH );
  33                 $parser->setFunctionHook( 'numberofusers',    array( __CLASS__, 'numberofusers'    ), SFH_NO_HASH );
  34                 $parser->setFunctionHook( 'numberofactiveusers', array( __CLASS__, 'numberofactiveusers' ), SFH_NO_HASH );
  35                 $parser->setFunctionHook( 'numberofarticles', array( __CLASS__, 'numberofarticles' ), SFH_NO_HASH );
  36                 $parser->setFunctionHook( 'numberoffiles',    array( __CLASS__, 'numberoffiles'    ), SFH_NO_HASH );
  37                 $parser->setFunctionHook( 'numberofadmins',   array( __CLASS__, 'numberofadmins'   ), SFH_NO_HASH );
  38                 $parser->setFunctionHook( 'numberingroup',    array( __CLASS__, 'numberingroup'    ), SFH_NO_HASH );
  39                 $parser->setFunctionHook( 'numberofedits',    array( __CLASS__, 'numberofedits'    ), SFH_NO_HASH );
  40                 $parser->setFunctionHook( 'numberofviews',    array( __CLASS__, 'numberofviews'    ), SFH_NO_HASH );
  41                 $parser->setFunctionHook( 'language',         array( __CLASS__, 'language'         ), SFH_NO_HASH );
  42                 $parser->setFunctionHook( 'padleft',          array( __CLASS__, 'padleft'          ), SFH_NO_HASH );
  43                 $parser->setFunctionHook( 'padright',         array( __CLASS__, 'padright'         ), SFH_NO_HASH );
  44                 $parser->setFunctionHook( 'anchorencode',     array( __CLASS__, 'anchorencode'     ), SFH_NO_HASH );
  45                 $parser->setFunctionHook( 'special',          array( __CLASS__, 'special'          ) );
  46                 $parser->setFunctionHook( 'defaultsort',      array( __CLASS__, 'defaultsort'      ), SFH_NO_HASH );
  47                 $parser->setFunctionHook( 'filepath',         array( __CLASS__, 'filepath'         ), SFH_NO_HASH );
  48                 $parser->setFunctionHook( 'pagesincategory',  array( __CLASS__, 'pagesincategory'  ), SFH_NO_HASH );
  49                 $parser->setFunctionHook( 'pagesize',         array( __CLASS__, 'pagesize'         ), SFH_NO_HASH );
  50                 $parser->setFunctionHook( 'protectionlevel',  array( __CLASS__, 'protectionlevel'  ), SFH_NO_HASH );
  51                 $parser->setFunctionHook( 'namespace',        array( __CLASS__, 'mwnamespace'      ), SFH_NO_HASH );
  52                 $parser->setFunctionHook( 'namespacee',       array( __CLASS__, 'namespacee'       ), SFH_NO_HASH );
  53                 $parser->setFunctionHook( 'talkspace',        array( __CLASS__, 'talkspace'        ), SFH_NO_HASH );
  54                 $parser->setFunctionHook( 'talkspacee',       array( __CLASS__, 'talkspacee'       ), SFH_NO_HASH );
  55                 $parser->setFunctionHook( 'subjectspace',     array( __CLASS__, 'subjectspace'     ), SFH_NO_HASH );
  56                 $parser->setFunctionHook( 'subjectspacee',    array( __CLASS__, 'subjectspacee'    ), SFH_NO_HASH );
  57                 $parser->setFunctionHook( 'pagename',         array( __CLASS__, 'pagename'         ), SFH_NO_HASH );
  58                 $parser->setFunctionHook( 'pagenamee',        array( __CLASS__, 'pagenamee'        ), SFH_NO_HASH );
  59                 $parser->setFunctionHook( 'fullpagename',     array( __CLASS__, 'fullpagename'     ), SFH_NO_HASH );
  60                 $parser->setFunctionHook( 'fullpagenamee',    array( __CLASS__, 'fullpagenamee'    ), SFH_NO_HASH );
  61                 $parser->setFunctionHook( 'basepagename',     array( __CLASS__, 'basepagename'     ), SFH_NO_HASH );
  62                 $parser->setFunctionHook( 'basepagenamee',    array( __CLASS__, 'basepagenamee'    ), SFH_NO_HASH );
  63                 $parser->setFunctionHook( 'subpagename',      array( __CLASS__, 'subpagename'      ), SFH_NO_HASH );
  64                 $parser->setFunctionHook( 'subpagenamee',     array( __CLASS__, 'subpagenamee'     ), SFH_NO_HASH );
  65                 $parser->setFunctionHook( 'talkpagename',     array( __CLASS__, 'talkpagename'     ), SFH_NO_HASH );
  66                 $parser->setFunctionHook( 'talkpagenamee',    array( __CLASS__, 'talkpagenamee'    ), SFH_NO_HASH );
  67                 $parser->setFunctionHook( 'subjectpagename',  array( __CLASS__, 'subjectpagename'  ), SFH_NO_HASH );
  68                 $parser->setFunctionHook( 'subjectpagenamee', array( __CLASS__, 'subjectpagenamee' ), SFH_NO_HASH );
  69                 $parser->setFunctionHook( 'tag',              array( __CLASS__, 'tagObj'           ), SFH_OBJECT_ARGS );
  70                 $parser->setFunctionHook( 'formatdate',           array( __CLASS__, 'formatDate'           ), SFH_NO_HASH );
  71
  72                 if ( $wgAllowDisplayTitle ) {
  73                         $parser->setFunctionHook( 'displaytitle', array( __CLASS__, 'displaytitle' ), SFH_NO_HASH );
  74                 }
  75                 if ( $wgAllowSlowParserFunctions ) {
  76                         $parser->setFunctionHook( 'pagesinnamespace', array( __CLASS__, 'pagesinnamespace' ), SFH_NO_HASH );
  77                 }
  78         }
  79
  80         static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  81                 if ( strval( $part1 ) !== '' ) {
  82                         $args = array_slice( func_get_args(), 2 );
  83                         $message = wfMsgGetKey( $part1, true, false, false );
  84                         $message = wfMsgReplaceArgs( $message, $args );
  85                         $message = $parser->replaceVariables( $message ); // like $wgMessageCache->transform()
  86                         return $message;
  87                 } else {
  88                         return array( 'found' => false );
  89                 }
  90         }
  91
  92         static function formatDate( $parser, $date, $defaultPref = null ) {
  93                 $df = DateFormatter::getInstance();
  94
  95                 $date = trim($date);
  96
  97                 $pref = $parser->mOptions->getDateFormat();
  98
  99                 // Specify a different default date format other than the the normal default
 100                 // iff the user has 'default' for their setting
 101                 if ($pref == 'default' && $defaultPref)
 102                         $pref = $defaultPref;
 103
 104                 $date = $df->reformat( $pref, $date, array('match-whole') );
 105                 return $date;
 106         }
 107
 108         static function ns( $parser, $part1 = '' ) {
 109                 global $wgContLang;
 110                 if ( intval( $part1 ) || $part1 == "0" ) {
 111                         $index = intval( $part1 );
 112                 } else {
 113                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 114                 }
 115                 if ( $index !== false ) {
 116                         return $wgContLang->getFormattedNsText( $index );
 117                 } else {
 118                         return array( 'found' => false );
 119                 }
 120         }
 121
 122         static function urlencode( $parser, $s = '' ) {
 123                 return urlencode( $s );
 124         }
 125
 126         static function lcfirst( $parser, $s = '' ) {
 127                 global $wgContLang;
 128                 return $wgContLang->lcfirst( $s );
 129         }
 130
 131         static function ucfirst( $parser, $s = '' ) {
 132                 global $wgContLang;
 133                 return $wgContLang->ucfirst( $s );
 134         }
 135
 136         static function lc( $parser, $s = '' ) {
 137                 global $wgContLang;
 138                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 139                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
 140                 } else {
 141                         return $wgContLang->lc( $s );
 142                 }
 143         }
 144
 145         static function uc( $parser, $s = '' ) {
 146                 global $wgContLang;
 147                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 148                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
 149                 } else {
 150                         return $wgContLang->uc( $s );
 151                 }
 152         }
 153
 154         static function localurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getLocalURL', $s, $arg ); }
 155         static function localurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeLocalURL', $s, $arg ); }
 156         static function fullurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getFullURL', $s, $arg ); }
 157         static function fullurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeFullURL', $s, $arg ); }
 158
 159         static function urlFunction( $func, $s = '', $arg = null ) {
 160                 $title = Title::newFromText( $s );
 161                 # Due to order of execution of a lot of bits, the values might be encoded
 162                 # before arriving here; if that's true, then the title can't be created
 163                 # and the variable will fail. If we can't get a decent title from the first
 164                 # attempt, url-decode and try for a second.
 165                 if( is_null( $title ) )
 166                         $title = Title::newFromUrl( urldecode( $s ) );
 167                 if( !is_null( $title ) ) {
 168                         # Convert NS_MEDIA -> NS_FILE
 169                         if( $title->getNamespace() == NS_MEDIA ) {
 170                                 $title = Title::makeTitle( NS_FILE, $title->getDBKey() );
 171                         }
 172                         if( !is_null( $arg ) ) {
 173                                 $text = $title->$func( $arg );
 174                         } else {
 175                                 $text = $title->$func();
 176                         }
 177                         return $text;
 178                 } else {
 179                         return array( 'found' => false );
 180                 }
 181         }
 182
 183         static function formatNum( $parser, $num = '', $raw = null) {
 184                 if ( self::israw( $raw ) ) {
 185                         return $parser->getFunctionLang()->parseFormattedNumber( $num );
 186                 } else {
 187                         return $parser->getFunctionLang()->formatNum( $num );
 188                 }
 189         }
 190
 191         static function grammar( $parser, $case = '', $word = '' ) {
 192                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 193         }
 194
 195         static function gender( $parser, $user ) {
 196                 $forms = array_slice( func_get_args(), 2);
 197
 198                 // default
 199                 $gender = User::getDefaultOption( 'gender' );
 200
 201                 // allow prefix.
 202                 $title = Title::newFromText( $user );
 203
 204                 if ($title->getNamespace == NS_USER)
 205                         $user = $title->getText();
 206
 207                 // check parameter, or use $wgUser if in interface message
 208                 $user = User::newFromName( $user );
 209                 if ( $user ) {
 210                         $gender = $user->getOption( 'gender' );
 211                 } elseif ( $parser->mOptions->getInterfaceMessage() ) {
 212                         global $wgUser;
 213                         $gender = $wgUser->getOption( 'gender' );
 214                 }
 215                 return $parser->getFunctionLang()->gender( $gender, $forms );
 216         }
 217         static function plural( $parser, $text = '') {
 218                 $forms = array_slice( func_get_args(), 2);
 219                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 220                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 221         }
 222
 223         /**
 224          * Override the title of the page when viewed, provided we've been given a
 225          * title which will normalise to the canonical title
 226          *
 227          * @param Parser $parser Parent parser
 228          * @param string $text Desired title text
 229          * @return string
 230          */
 231         static function displaytitle( $parser, $text = '' ) {
 232                 global $wgRestrictDisplayTitle;
 233                 $text = trim( Sanitizer::decodeCharReferences( $text ) );
 234
 235                 if ( !$wgRestrictDisplayTitle ) {
 236                         $parser->mOutput->setDisplayTitle( $text );
 237                 } else {
 238                         $title = Title::newFromText( $text );
 239                         if( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) )
 240                                 $parser->mOutput->setDisplayTitle( $text );
 241                 }
 242                 return '';
 243         }
 244
 245         static function isRaw( $param ) {
 246                 static $mwRaw;
 247                 if ( !$mwRaw ) {
 248                         $mwRaw =& MagicWord::get( 'rawsuffix' );
 249                 }
 250                 if ( is_null( $param ) ) {
 251                         return false;
 252                 } else {
 253                         return $mwRaw->match( $param );
 254                 }
 255         }
 256
 257         static function formatRaw( $num, $raw ) {
 258                 if( self::isRaw( $raw ) ) {
 259                         return $num;
 260                 } else {
 261                         global $wgContLang;
 262                         return $wgContLang->formatNum( $num );
 263                 }
 264         }
 265         static function numberofpages( $parser, $raw = null ) {
 266                 return self::formatRaw( SiteStats::pages(), $raw );
 267         }
 268         static function numberofusers( $parser, $raw = null ) {
 269                 return self::formatRaw( SiteStats::users(), $raw );
 270         }
 271         static function numberofactiveusers( $parser, $raw = null ) {
 272                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 273         }
 274         static function numberofarticles( $parser, $raw = null ) {
 275                 return self::formatRaw( SiteStats::articles(), $raw );
 276         }
 277         static function numberoffiles( $parser, $raw = null ) {
 278                 return self::formatRaw( SiteStats::images(), $raw );
 279         }
 280         static function numberofadmins( $parser, $raw = null ) {
 281                 return self::formatRaw( SiteStats::numberingroup('sysop'), $raw );
 282         }
 283         static function numberofedits( $parser, $raw = null ) {
 284                 return self::formatRaw( SiteStats::edits(), $raw );
 285         }
 286         static function numberofviews( $parser, $raw = null ) {
 287                 return self::formatRaw( SiteStats::views(), $raw );
 288         }
 289         static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 290                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 291         }
 292         static function numberingroup( $parser, $name = '', $raw = null) {
 293                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 294         }
 295
 296
 297         /**
 298          * Given a title, return the namespace name that would be given by the
 299          * corresponding magic word
 300          * Note: function name changed to "mwnamespace" rather than "namespace"
 301          * to not break PHP 5.3
 302          */
 303         static function mwnamespace( $parser, $title = null ) {
 304                 $t = Title::newFromText( $title );
 305                 if ( is_null($t) )
 306                         return '';
 307                 return str_replace( '_', ' ', $t->getNsText() );
 308         }
 309         static function namespacee( $parser, $title = null ) {
 310                 $t = Title::newFromText( $title );
 311                 if ( is_null($t) )
 312                         return '';
 313                 return wfUrlencode( $t->getNsText() );
 314         }
 315         static function talkspace( $parser, $title = null ) {
 316                 $t = Title::newFromText( $title );
 317                 if ( is_null($t) || !$t->canTalk() )
 318                         return '';
 319                 return str_replace( '_', ' ', $t->getTalkNsText() );
 320         }
 321         static function talkspacee( $parser, $title = null ) {
 322                 $t = Title::newFromText( $title );
 323                 if ( is_null($t) || !$t->canTalk() )
 324                         return '';
 325                 return wfUrlencode( $t->getTalkNsText() );
 326         }
 327         static function subjectspace( $parser, $title = null ) {
 328                 $t = Title::newFromText( $title );
 329                 if ( is_null($t) )
 330                         return '';
 331                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 332         }
 333         static function subjectspacee( $parser, $title = null ) {
 334                 $t = Title::newFromText( $title );
 335                 if ( is_null($t) )
 336                         return '';
 337                 return wfUrlencode( $t->getSubjectNsText() );
 338         }
 339         /*
 340          * Functions to get and normalize pagenames, corresponding to the magic words
 341          * of the same names
 342         */
 343         static function pagename( $parser, $title = null ) {
 344                 $t = Title::newFromText( $title );
 345                 if ( is_null($t) )
 346                         return '';
 347                 return wfEscapeWikiText( $t->getText() );
 348         }
 349         static function pagenamee( $parser, $title = null ) {
 350                 $t = Title::newFromText( $title );
 351                 if ( is_null($t) )
 352                         return '';
 353                 return $t->getPartialURL();
 354         }
 355         static function fullpagename( $parser, $title = null ) {
 356                 $t = Title::newFromText( $title );
 357                 if ( is_null($t) || !$t->canTalk() )
 358                         return '';
 359                 return wfEscapeWikiText( $t->getPrefixedText() );
 360         }
 361         static function fullpagenamee( $parser, $title = null ) {
 362                 $t = Title::newFromText( $title );
 363                 if ( is_null($t) || !$t->canTalk() )
 364                         return '';
 365                 return $t->getPrefixedURL();
 366         }
 367         static function subpagename( $parser, $title = null ) {
 368                 $t = Title::newFromText( $title );
 369                 if ( is_null($t) )
 370                         return '';
 371                 return $t->getSubpageText();
 372         }
 373         static function subpagenamee( $parser, $title = null ) {
 374                 $t = Title::newFromText( $title );
 375                 if ( is_null($t) )
 376                         return '';
 377                 return $t->getSubpageUrlForm();
 378         }
 379         static function basepagename( $parser, $title = null ) {
 380                 $t = Title::newFromText( $title );
 381                 if ( is_null($t) )
 382                         return '';
 383                 return $t->getBaseText();
 384         }
 385         static function basepagenamee( $parser, $title = null ) {
 386                 $t = Title::newFromText( $title );
 387                 if ( is_null($t) )
 388                         return '';
 389                 return wfUrlEncode( str_replace( ' ', '_', $t->getBaseText() ) );
 390         }
 391         static function talkpagename( $parser, $title = null ) {
 392                 $t = Title::newFromText( $title );
 393                 if ( is_null($t) || !$t->canTalk() )
 394                         return '';
 395                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 396         }
 397         static function talkpagenamee( $parser, $title = null ) {
 398                 $t = Title::newFromText( $title );
 399                 if ( is_null($t) || !$t->canTalk() )
 400                         return '';
 401                 return $t->getTalkPage()->getPrefixedUrl();
 402         }
 403         static function subjectpagename( $parser, $title = null ) {
 404                 $t = Title::newFromText( $title );
 405                 if ( is_null($t) )
 406                         return '';
 407                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 408         }
 409         static function subjectpagenamee( $parser, $title = null ) {
 410                 $t = Title::newFromText( $title );
 411                 if ( is_null($t) )
 412                         return '';
 413                 return $t->getSubjectPage()->getPrefixedUrl();
 414         }
 415
 416         /**
 417          * Return the number of pages in the given category, or 0 if it's nonexis-
 418          * tent.  This is an expensive parser function and can't be called too many
 419          * times per page.
 420          */
 421         static function pagesincategory( $parser, $name = '', $raw = null ) {
 422                 static $cache = array();
 423                 $category = Category::newFromName( $name );
 424
 425                 if( !is_object( $category ) ) {
 426                         $cache[$name] = 0;
 427                         return self::formatRaw( 0, $raw );
 428                 }
 429
 430                 # Normalize name for cache
 431                 $name = $category->getName();
 432
 433                 $count = 0;
 434                 if( isset( $cache[$name] ) ) {
 435                         $count = $cache[$name];
 436                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 437                         $count = $cache[$name] = (int)$category->getPageCount();
 438                 }
 439                 return self::formatRaw( $count, $raw );
 440         }
 441
 442         /**
 443          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 444          * expensive parser function and can't be called too many times per page.
 445          *
 446          * @FIXME This doesn't work correctly on preview for getting the size of
 447          *   the current page.
 448          * @FIXME Title::getLength() documentation claims that it adds things to
 449          *   the link cache, so the local cache here should be unnecessary, but in
 450          *   fact calling getLength() repeatedly for the same $page does seem to
 451          *   run one query for each call?
 452          */
 453         static function pagesize( $parser, $page = '', $raw = null ) {
 454                 static $cache = array();
 455                 $title = Title::newFromText($page);
 456
 457                 if( !is_object( $title ) ) {
 458                         $cache[$page] = 0;
 459                         return self::formatRaw( 0, $raw );
 460                 }
 461
 462                 # Normalize name for cache
 463                 $page = $title->getPrefixedText();
 464
 465                 $length = 0;
 466                 if( isset( $cache[$page] ) ) {
 467                         $length = $cache[$page];
 468                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 469                         $rev = Revision::newFromTitle($title);
 470                         $id = $rev ? $rev->getPage() : 0;
 471                         $length = $cache[$page] = $rev ? $rev->getSize() : 0;
 472
 473                         // Register dependency in templatelinks
 474                         $parser->mOutput->addTemplate( $title, $id, $rev ? $rev->getId() : 0 );
 475                 }
 476                 return self::formatRaw( $length, $raw );
 477         }
 478
 479         /**
 480         * Returns the requested protection level for the current page
 481         */
 482         static function protectionlevel( $parser, $type = '' ) {
 483                 $restrictions = $parser->mTitle->getRestrictions( strtolower( $type ) );
 484                 # Title::getRestrictions returns an array, its possible it may have
 485                 # multiple values in the future
 486                 return implode( $restrictions, ',' );
 487         }
 488
 489         static function language( $parser, $arg = '' ) {
 490                 global $wgContLang;
 491                 $lang = $wgContLang->getLanguageName( strtolower( $arg ) );
 492                 return $lang != '' ? $lang : $arg;
 493         }
 494
 495         /**
 496          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 497          */
 498         static function pad( $string, $length, $padding = '0', $direction = STR_PAD_RIGHT ) {
 499                 $lengthOfPadding = mb_strlen( $padding );
 500                 if ( $lengthOfPadding == 0 ) return $string;
 501
 502                 # The remaining length to add counts down to 0 as padding is added
 503                 $length = min( $length, 500 ) - mb_strlen( $string );
 504                 # $finalPadding is just $padding repeated enough times so that
 505                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 506                 $finalPadding = '';
 507                 while ( $length > 0 ) {
 508                         # If $length < $lengthofPadding, truncate $padding so we get the
 509                         # exact length desired.
 510                         $finalPadding .= mb_substr( $padding, 0, $length );
 511                         $length -= $lengthOfPadding;
 512                 }
 513
 514                 if ( $direction == STR_PAD_LEFT ) {
 515                         return $finalPadding . $string;
 516                 } else {
 517                         return $string . $finalPadding;
 518                 }
 519         }
 520
 521         static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 522                 return self::pad( $string, $length, $padding, STR_PAD_LEFT );
 523         }
 524
 525         static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 526                 return self::pad( $string, $length, $padding );
 527         }
 528
 529         static function anchorencode( $parser, $text ) {
 530                 $a = urlencode( $text );
 531                 $a = strtr( $a, array( '%' => '.', '+' => '_' ) );
 532                 # leave colons alone, however
 533                 $a = str_replace( '.3A', ':', $a );
 534                 return $a;
 535         }
 536
 537         static function special( $parser, $text ) {
 538                 $title = SpecialPage::getTitleForAlias( $text );
 539                 if ( $title ) {
 540                         return $title->getPrefixedText();
 541                 } else {
 542                         return wfMsgForContent( 'nosuchspecialpage' );
 543                 }
 544         }
 545
 546         public static function defaultsort( $parser, $text ) {
 547                 $text = trim( $text );
 548                 if( strlen( $text ) == 0 )
 549                         return '';
 550                 $old = $parser->getCustomDefaultSort();
 551                 $parser->setDefaultSort( $text );
 552                 if( $old === false || $old == $text )
 553                         return '';
 554                 else
 555                         return( '<span class="error">' .
 556                                 wfMsg( 'duplicate-defaultsort',
 557                                                  htmlspecialchars( $old ),
 558                                                  htmlspecialchars( $text ) ) .
 559                                 '</span>' );
 560         }
 561
 562         public static function filepath( $parser, $name='', $option='' ) {
 563                 $file = wfFindFile( $name );
 564                 if( $file ) {
 565                         $url = $file->getFullUrl();
 566                         if( $option == 'nowiki' ) {
 567                                 return array( $url, 'nowiki' => true );
 568                         }
 569                         return $url;
 570                 } else {
 571                         return '';
 572                 }
 573         }
 574
 575         /**
 576          * Parser function to extension tag adaptor
 577          */
 578         public static function tagObj( $parser, $frame, $args ) {
 579                 $xpath = false;
 580                 if ( !count( $args ) ) {
 581                         return '';
 582                 }
 583                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 584
 585                 if ( count( $args ) ) {
 586                         $inner = $frame->expand( array_shift( $args ) );
 587                 } else {
 588                         $inner = null;
 589                 }
 590
 591                 $stripList = $parser->getStripList();
 592                 if ( !in_array( $tagName, $stripList ) ) {
 593                         return '<span class="error">' .
 594                                 wfMsg( 'unknown_extension_tag', $tagName ) .
 595                                 '</span>';
 596                 }
 597
 598                 $attributes = array();
 599                 foreach ( $args as $arg ) {
 600                         $bits = $arg->splitArg();
 601                         if ( strval( $bits['index'] ) === '' ) {
 602                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 603                                 $value = trim( $frame->expand( $bits['value'] ) );
 604                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 605                                         $value = isset( $m[1] ) ? $m[1] : '';
 606                                 }
 607                                 $attributes[$name] = $value;
 608                         }
 609                 }
 610
 611                 $params = array(
 612                         'name' => $tagName,
 613                         'inner' => $inner,
 614                         'attributes' => $attributes,
 615                         'close' => "</$tagName>",
 616                 );
 617                 return $parser->extensionSubstitution( $params, $frame );
 618         }
 619 }