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( 'revisionid',       array( __CLASS__, 'revisionid'       ), SFH_NO_HASH );
  70                 $parser->setFunctionHook( 'revisiontimestamp',array( __CLASS__, 'revisiontimestamp'), SFH_NO_HASH );
  71                 $parser->setFunctionHook( 'revisionday',      array( __CLASS__, 'revisionday'      ), SFH_NO_HASH );
  72                 $parser->setFunctionHook( 'revisionday2',     array( __CLASS__, 'revisionday2'     ), SFH_NO_HASH );
  73                 $parser->setFunctionHook( 'revisionmonth',    array( __CLASS__, 'revisionmonth'    ), SFH_NO_HASH );
  74                 $parser->setFunctionHook( 'revisionyear',     array( __CLASS__, 'revisionyear'     ), SFH_NO_HASH );
  75                 $parser->setFunctionHook( 'revisionuser',     array( __CLASS__, 'revisionuser'     ), SFH_NO_HASH );
  76                 $parser->setFunctionHook( 'tag',              array( __CLASS__, 'tagObj'           ), SFH_OBJECT_ARGS );
  77                 $parser->setFunctionHook( 'formatdate',           array( __CLASS__, 'formatDate'           ) );
  78                 $parser->setFunctionHook( 'groupconvert',         array( __CLASS__, 'groupconvert'         ), SFH_NO_HASH );
  79
  80                 if ( $wgAllowDisplayTitle ) {
  81                         $parser->setFunctionHook( 'displaytitle', array( __CLASS__, 'displaytitle' ), SFH_NO_HASH );
  82                 }
  83                 if ( $wgAllowSlowParserFunctions ) {
  84                         $parser->setFunctionHook( 'pagesinnamespace', array( __CLASS__, 'pagesinnamespace' ), SFH_NO_HASH );
  85                 }
  86         }
  87
  88         static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  89                 if ( strval( $part1 ) !== '' ) {
  90                         $args = array_slice( func_get_args(), 2 );
  91                         $message = wfMsgGetKey( $part1, true, false, false );
  92                         $message = wfMsgReplaceArgs( $message, $args );
  93                         $message = $parser->replaceVariables( $message ); // like $wgMessageCache->transform()
  94                         return $message;
  95                 } else {
  96                         return array( 'found' => false );
  97                 }
  98         }
  99
 100         static function formatDate( $parser, $date, $defaultPref = null ) {
 101                 $df = DateFormatter::getInstance();
 102
 103                 $date = trim($date);
 104
 105                 $pref = $parser->mOptions->getDateFormat();
 106
 107                 // Specify a different default date format other than the the normal default
 108                 // iff the user has 'default' for their setting
 109                 if ($pref == 'default' && $defaultPref)
 110                         $pref = $defaultPref;
 111
 112                 $date = $df->reformat( $pref, $date, array('match-whole') );
 113                 return $date;
 114         }
 115
 116         static function ns( $parser, $part1 = '' ) {
 117                 global $wgContLang;
 118                 if ( intval( $part1 ) || $part1 == "0" ) {
 119                         $index = intval( $part1 );
 120                 } else {
 121                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 122                 }
 123                 if ( $index !== false ) {
 124                         return $wgContLang->getFormattedNsText( $index );
 125                 } else {
 126                         return array( 'found' => false );
 127                 }
 128         }
 129
 130         static function urlencode( $parser, $s = '' ) {
 131                 return urlencode( $s );
 132         }
 133
 134         static function lcfirst( $parser, $s = '' ) {
 135                 global $wgContLang;
 136                 return $wgContLang->lcfirst( $s );
 137         }
 138
 139         static function ucfirst( $parser, $s = '' ) {
 140                 global $wgContLang;
 141                 return $wgContLang->ucfirst( $s );
 142         }
 143
 144         static function lc( $parser, $s = '' ) {
 145                 global $wgContLang;
 146                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 147                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
 148                 } else {
 149                         return $wgContLang->lc( $s );
 150                 }
 151         }
 152
 153         static function uc( $parser, $s = '' ) {
 154                 global $wgContLang;
 155                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 156                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
 157                 } else {
 158                         return $wgContLang->uc( $s );
 159                 }
 160         }
 161
 162         static function localurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getLocalURL', $s, $arg ); }
 163         static function localurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeLocalURL', $s, $arg ); }
 164         static function fullurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getFullURL', $s, $arg ); }
 165         static function fullurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeFullURL', $s, $arg ); }
 166
 167         static function urlFunction( $func, $s = '', $arg = null ) {
 168                 $title = Title::newFromText( $s );
 169                 # Due to order of execution of a lot of bits, the values might be encoded
 170                 # before arriving here; if that's true, then the title can't be created
 171                 # and the variable will fail. If we can't get a decent title from the first
 172                 # attempt, url-decode and try for a second.
 173                 if( is_null( $title ) )
 174                         $title = Title::newFromUrl( urldecode( $s ) );
 175                 if( !is_null( $title ) ) {
 176                         # Convert NS_MEDIA -> NS_FILE
 177                         if( $title->getNamespace() == NS_MEDIA ) {
 178                                 $title = Title::makeTitle( NS_FILE, $title->getDBKey() );
 179                         }
 180                         if( !is_null( $arg ) ) {
 181                                 $text = $title->$func( $arg );
 182                         } else {
 183                                 $text = $title->$func();
 184                         }
 185                         return $text;
 186                 } else {
 187                         return array( 'found' => false );
 188                 }
 189         }
 190
 191         static function formatNum( $parser, $num = '', $raw = null) {
 192                 if ( self::israw( $raw ) ) {
 193                         return $parser->getFunctionLang()->parseFormattedNumber( $num );
 194                 } else {
 195                         return $parser->getFunctionLang()->formatNum( $num );
 196                 }
 197         }
 198
 199         static function grammar( $parser, $case = '', $word = '' ) {
 200                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 201         }
 202
 203         static function gender( $parser, $user ) {
 204                 $forms = array_slice( func_get_args(), 2);
 205
 206                 // default
 207                 $gender = User::getDefaultOption( 'gender' );
 208
 209                 // allow prefix.
 210                 $title = Title::newFromText( $user );
 211
 212                 if (is_object( $title ) && $title->getNamespace() == NS_USER)
 213                         $user = $title->getText();
 214
 215                 // check parameter, or use $wgUser if in interface message
 216                 $user = User::newFromName( $user );
 217                 if ( $user ) {
 218                         $gender = $user->getOption( 'gender' );
 219                 } elseif ( $parser->mOptions->getInterfaceMessage() ) {
 220                         global $wgUser;
 221                         $gender = $wgUser->getOption( 'gender' );
 222                 }
 223                 return $parser->getFunctionLang()->gender( $gender, $forms );
 224         }
 225         static function plural( $parser, $text = '') {
 226                 $forms = array_slice( func_get_args(), 2);
 227                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 228                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 229         }
 230
 231         /**
 232          * Override the title of the page when viewed, provided we've been given a
 233          * title which will normalise to the canonical title
 234          *
 235          * @param Parser $parser Parent parser
 236          * @param string $text Desired title text
 237          * @return string
 238          */
 239         static function displaytitle( $parser, $displayTitle = '' ) {
 240                 #only requested titles that normalize to the actual title are allowed through
 241                 #mimic the escaping process that occurs in OutputPage::setPageTitle
 242                 $title = Title::newFromText( Sanitizer::stripAllTags( Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $displayTitle ) ) ) );
 243
 244                 if ( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) ) {
 245                         $parser->mOutput->setDisplayTitle( $displayTitle );
 246                 }
 247
 248                 return '';
 249         }
 250
 251         static function isRaw( $param ) {
 252                 static $mwRaw;
 253                 if ( !$mwRaw ) {
 254                         $mwRaw =& MagicWord::get( 'rawsuffix' );
 255                 }
 256                 if ( is_null( $param ) ) {
 257                         return false;
 258                 } else {
 259                         return $mwRaw->match( $param );
 260                 }
 261         }
 262
 263         static function formatRaw( $num, $raw ) {
 264                 if( self::isRaw( $raw ) ) {
 265                         return $num;
 266                 } else {
 267                         global $wgContLang;
 268                         return $wgContLang->formatNum( $num );
 269                 }
 270         }
 271         static function numberofpages( $parser, $raw = null ) {
 272                 return self::formatRaw( SiteStats::pages(), $raw );
 273         }
 274         static function numberofusers( $parser, $raw = null ) {
 275                 return self::formatRaw( SiteStats::users(), $raw );
 276         }
 277         static function numberofactiveusers( $parser, $raw = null ) {
 278                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 279         }
 280         static function numberofarticles( $parser, $raw = null ) {
 281                 return self::formatRaw( SiteStats::articles(), $raw );
 282         }
 283         static function numberoffiles( $parser, $raw = null ) {
 284                 return self::formatRaw( SiteStats::images(), $raw );
 285         }
 286         static function numberofadmins( $parser, $raw = null ) {
 287                 return self::formatRaw( SiteStats::numberingroup('sysop'), $raw );
 288         }
 289         static function numberofedits( $parser, $raw = null ) {
 290                 return self::formatRaw( SiteStats::edits(), $raw );
 291         }
 292         static function numberofviews( $parser, $raw = null ) {
 293                 return self::formatRaw( SiteStats::views(), $raw );
 294         }
 295         static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 296                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 297         }
 298         static function numberingroup( $parser, $name = '', $raw = null) {
 299                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 300         }
 301
 302
 303         /**
 304          * Given a title, return the namespace name that would be given by the
 305          * corresponding magic word
 306          * Note: function name changed to "mwnamespace" rather than "namespace"
 307          * to not break PHP 5.3
 308          */
 309         static function mwnamespace( $parser, $title = null ) {
 310                 $t = Title::newFromText( $title );
 311                 if ( is_null($t) )
 312                         return '';
 313                 return str_replace( '_', ' ', $t->getNsText() );
 314         }
 315         static function namespacee( $parser, $title = null ) {
 316                 $t = Title::newFromText( $title );
 317                 if ( is_null($t) )
 318                         return '';
 319                 return wfUrlencode( $t->getNsText() );
 320         }
 321         static function talkspace( $parser, $title = null ) {
 322                 $t = Title::newFromText( $title );
 323                 if ( is_null($t) || !$t->canTalk() )
 324                         return '';
 325                 return str_replace( '_', ' ', $t->getTalkNsText() );
 326         }
 327         static function talkspacee( $parser, $title = null ) {
 328                 $t = Title::newFromText( $title );
 329                 if ( is_null($t) || !$t->canTalk() )
 330                         return '';
 331                 return wfUrlencode( $t->getTalkNsText() );
 332         }
 333         static function subjectspace( $parser, $title = null ) {
 334                 $t = Title::newFromText( $title );
 335                 if ( is_null($t) )
 336                         return '';
 337                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 338         }
 339         static function subjectspacee( $parser, $title = null ) {
 340                 $t = Title::newFromText( $title );
 341                 if ( is_null($t) )
 342                         return '';
 343                 return wfUrlencode( $t->getSubjectNsText() );
 344         }
 345         /*
 346          * Functions to get and normalize pagenames, corresponding to the magic words
 347          * of the same names
 348         */
 349         static function pagename( $parser, $title = null ) {
 350                 $t = Title::newFromText( $title );
 351                 if ( is_null($t) )
 352                         return '';
 353                 return wfEscapeWikiText( $t->getText() );
 354         }
 355         static function pagenamee( $parser, $title = null ) {
 356                 $t = Title::newFromText( $title );
 357                 if ( is_null($t) )
 358                         return '';
 359                 return $t->getPartialURL();
 360         }
 361         static function fullpagename( $parser, $title = null ) {
 362                 $t = Title::newFromText( $title );
 363                 if ( is_null($t) || !$t->canTalk() )
 364                         return '';
 365                 return wfEscapeWikiText( $t->getPrefixedText() );
 366         }
 367         static function fullpagenamee( $parser, $title = null ) {
 368                 $t = Title::newFromText( $title );
 369                 if ( is_null($t) || !$t->canTalk() )
 370                         return '';
 371                 return $t->getPrefixedURL();
 372         }
 373         static function subpagename( $parser, $title = null ) {
 374                 $t = Title::newFromText( $title );
 375                 if ( is_null($t) )
 376                         return '';
 377                 return $t->getSubpageText();
 378         }
 379         static function subpagenamee( $parser, $title = null ) {
 380                 $t = Title::newFromText( $title );
 381                 if ( is_null($t) )
 382                         return '';
 383                 return $t->getSubpageUrlForm();
 384         }
 385         static function basepagename( $parser, $title = null ) {
 386                 $t = Title::newFromText( $title );
 387                 if ( is_null($t) )
 388                         return '';
 389                 return $t->getBaseText();
 390         }
 391         static function basepagenamee( $parser, $title = null ) {
 392                 $t = Title::newFromText( $title );
 393                 if ( is_null($t) )
 394                         return '';
 395                 return wfUrlEncode( str_replace( ' ', '_', $t->getBaseText() ) );
 396         }
 397         static function talkpagename( $parser, $title = null ) {
 398                 $t = Title::newFromText( $title );
 399                 if ( is_null($t) || !$t->canTalk() )
 400                         return '';
 401                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 402         }
 403         static function talkpagenamee( $parser, $title = null ) {
 404                 $t = Title::newFromText( $title );
 405                 if ( is_null($t) || !$t->canTalk() )
 406                         return '';
 407                 return $t->getTalkPage()->getPrefixedUrl();
 408         }
 409         static function subjectpagename( $parser, $title = null ) {
 410                 $t = Title::newFromText( $title );
 411                 if ( is_null($t) )
 412                         return '';
 413                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 414         }
 415         static function subjectpagenamee( $parser, $title = null ) {
 416                 $t = Title::newFromText( $title );
 417                 if ( is_null($t) )
 418                         return '';
 419                 return $t->getSubjectPage()->getPrefixedUrl();
 420         }
 421         /*
 422          * Functions to get revision informations, corresponding to the magic words
 423          * of the same names
 424          */
 425         static function revisionid( $parser, $title = null ) {
 426                 static $cache = array ();
 427                 $t = Title::newFromText( $title );
 428                 if ( is_null( $t ) )
 429                         return '';
 430                 if ( $t->equals( $parser->getTitle() ) ) {
 431                         // Let the edit saving system know we should parse the page
 432                         // *after* a revision ID has been assigned.
 433                         $parser->mOutput->setFlag( 'vary-revision' );
 434                         wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
 435                         return $parser->getRevisionId();
 436                 }
 437                 if ( isset( $cache[$t->getPrefixedText()] ) )
 438                         return $cache[$t->getPrefixedText()];
 439                 elseif ( $parser->incrementExpensiveFunctionCount() ) {
 440                         $a = new Article( $t );
 441                         return $cache[$t->getPrefixedText()] = $a->getRevIdFetched();
 442                 }
 443                 return '';
 444         }
 445         static function revisiontimestamp( $parser, $title = null ) {
 446                 static $cache = array ();
 447                 $t = Title::newFromText( $title );
 448                 if ( is_null( $t ) )
 449                         return '';
 450                 if ( $t->equals( $parser->getTitle() ) ) {
 451                         // Let the edit saving system know we should parse the page
 452                         // *after* a revision ID has been assigned. This is for null edits.
 453                         $parser->mOutput->setFlag( 'vary-revision' );
 454                         wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} or related parser function used, setting vary-revision...\n" );
 455                         return $parser->getRevisionTimestamp();
 456                 }
 457                 if ( isset( $cache[$t->getPrefixedText()] ) )
 458                         return $cache[$t->getPrefixedText()];
 459                 elseif ( $parser->incrementExpensiveFunctionCount() ) {
 460                         $a = new Article( $t );
 461                         return $cache[$t->getPrefixedText()] = $a->getTimestamp();
 462                 }
 463                 return '';
 464         }
 465         static function revisionday( $parser, $title = null ) {
 466                 $timestamp = self::revisiontimestamp( $parser, $title );
 467                 if ( $timestamp == '' ) return '';
 468                 return intval( substr( $timestamp, 6, 2 ) );
 469         }
 470         static function revisionday2( $parser, $title = null ) {
 471                 $timestamp = self::revisiontimestamp( $parser, $title );
 472                 if ( $timestamp == '' ) return '';
 473                 return substr( $timestamp, 6, 2 );
 474         }
 475         static function revisionmonth( $parser, $title = null ) {
 476                 $timestamp = self::revisiontimestamp( $parser, $title );
 477                 if ( $timestamp == '' ) return '';
 478                 return intval( substr( $timestamp, 4, 2 ) );
 479         }
 480         static function revisionyear( $parser, $title = null ) {
 481                 $timestamp = self::revisiontimestamp( $parser, $title );
 482                 if ( $timestamp == '' ) return '';
 483                 return substr( $timestamp, 0, 4 );
 484         }
 485         static function revisionuser( $parser, $title = null ) {
 486                 static $cache = array();
 487                 $t = Title::newFromText( $title );
 488                 if ( is_null( $t ) )
 489                         return '';
 490                 if ( $t->equals( $parser->getTitle() ) ) {
 491                         // Let the edit saving system know we should parse the page
 492                         // *after* a revision ID has been assigned. This is for null edits.
 493                         $parser->mOutput->setFlag( 'vary-revision' );
 494                         wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
 495                         return $parser->getRevisionUser();
 496                 }
 497                 if ( isset( $cache[$t->getPrefixedText()] ) )
 498                         return $cache[$t->getPrefixedText()];
 499                 elseif ( $parser->incrementExpensiveFunctionCount() ) {
 500                         $a = new Article( $t );
 501                         return $cache[$t->getPrefixedText()] = $a->getUserText();
 502                 }
 503                 return '';
 504         }
 505
 506         /**
 507          * Return the number of pages in the given category, or 0 if it's nonexis-
 508          * tent.  This is an expensive parser function and can't be called too many
 509          * times per page.
 510          */
 511         static function pagesincategory( $parser, $name = '', $raw = null ) {
 512                 static $cache = array();
 513                 $category = Category::newFromName( $name );
 514
 515                 if( !is_object( $category ) ) {
 516                         $cache[$name] = 0;
 517                         return self::formatRaw( 0, $raw );
 518                 }
 519
 520                 # Normalize name for cache
 521                 $name = $category->getName();
 522
 523                 $count = 0;
 524                 if( isset( $cache[$name] ) ) {
 525                         $count = $cache[$name];
 526                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 527                         $count = $cache[$name] = (int)$category->getPageCount();
 528                 }
 529                 return self::formatRaw( $count, $raw );
 530         }
 531
 532         /**
 533          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 534          * expensive parser function and can't be called too many times per page.
 535          *
 536          * @FIXME This doesn't work correctly on preview for getting the size of
 537          *   the current page.
 538          * @FIXME Title::getLength() documentation claims that it adds things to
 539          *   the link cache, so the local cache here should be unnecessary, but in
 540          *   fact calling getLength() repeatedly for the same $page does seem to
 541          *   run one query for each call?
 542          */
 543         static function pagesize( $parser, $page = '', $raw = null ) {
 544                 static $cache = array();
 545                 $title = Title::newFromText($page);
 546
 547                 if( !is_object( $title ) ) {
 548                         $cache[$page] = 0;
 549                         return self::formatRaw( 0, $raw );
 550                 }
 551
 552                 # Normalize name for cache
 553                 $page = $title->getPrefixedText();
 554
 555                 $length = 0;
 556                 if( isset( $cache[$page] ) ) {
 557                         $length = $cache[$page];
 558                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 559                         $rev = Revision::newFromTitle($title);
 560                         $id = $rev ? $rev->getPage() : 0;
 561                         $length = $cache[$page] = $rev ? $rev->getSize() : 0;
 562
 563                         // Register dependency in templatelinks
 564                         $parser->mOutput->addTemplate( $title, $id, $rev ? $rev->getId() : 0 );
 565                 }
 566                 return self::formatRaw( $length, $raw );
 567         }
 568
 569         /**
 570         * Returns the requested protection level for the current page
 571         */
 572         static function protectionlevel( $parser, $type = '' ) {
 573                 $restrictions = $parser->mTitle->getRestrictions( strtolower( $type ) );
 574                 # Title::getRestrictions returns an array, its possible it may have
 575                 # multiple values in the future
 576                 return implode( $restrictions, ',' );
 577         }
 578
 579         static function language( $parser, $arg = '' ) {
 580                 global $wgContLang;
 581                 $lang = $wgContLang->getLanguageName( strtolower( $arg ) );
 582                 return $lang != '' ? $lang : $arg;
 583         }
 584
 585         /**
 586          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 587          */
 588         static function pad( $string, $length, $padding = '0', $direction = STR_PAD_RIGHT ) {
 589                 $lengthOfPadding = mb_strlen( $padding );
 590                 if ( $lengthOfPadding == 0 ) return $string;
 591
 592                 # The remaining length to add counts down to 0 as padding is added
 593                 $length = min( $length, 500 ) - mb_strlen( $string );
 594                 # $finalPadding is just $padding repeated enough times so that
 595                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 596                 $finalPadding = '';
 597                 while ( $length > 0 ) {
 598                         # If $length < $lengthofPadding, truncate $padding so we get the
 599                         # exact length desired.
 600                         $finalPadding .= mb_substr( $padding, 0, $length );
 601                         $length -= $lengthOfPadding;
 602                 }
 603
 604                 if ( $direction == STR_PAD_LEFT ) {
 605                         return $finalPadding . $string;
 606                 } else {
 607                         return $string . $finalPadding;
 608                 }
 609         }
 610
 611         static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 612                 return self::pad( $string, $length, $padding, STR_PAD_LEFT );
 613         }
 614
 615         static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 616                 return self::pad( $string, $length, $padding );
 617         }
 618
 619         static function anchorencode( $parser, $text ) {
 620                 $a = urlencode( $text );
 621                 $a = strtr( $a, array( '%' => '.', '+' => '_' ) );
 622                 # leave colons alone, however
 623                 $a = str_replace( '.3A', ':', $a );
 624                 return $a;
 625         }
 626
 627         static function special( $parser, $text ) {
 628                 $title = SpecialPage::getTitleForAlias( $text );
 629                 if ( $title ) {
 630                         return $title->getPrefixedText();
 631                 } else {
 632                         return wfMsgForContent( 'nosuchspecialpage' );
 633                 }
 634         }
 635
 636         public static function defaultsort( $parser, $text ) {
 637                 $text = trim( $text );
 638                 if( strlen( $text ) == 0 )
 639                         return '';
 640                 $old = $parser->getCustomDefaultSort();
 641                 $parser->setDefaultSort( $text );
 642                 if( $old === false || $old == $text )
 643                         return '';
 644                 else
 645                         return( '<span class="error">' .
 646                                 wfMsg( 'duplicate-defaultsort',
 647                                                  htmlspecialchars( $old ),
 648                                                  htmlspecialchars( $text ) ) .
 649                                 '</span>' );
 650         }
 651
 652         public static function filepath( $parser, $name='', $option='' ) {
 653                 $file = wfFindFile( $name );
 654                 if( $file ) {
 655                         $url = $file->getFullUrl();
 656                         if( $option == 'nowiki' ) {
 657                                 return array( $url, 'nowiki' => true );
 658                         }
 659                         return $url;
 660                 } else {
 661                         return '';
 662                 }
 663         }
 664
 665         /**
 666          * Parser function to extension tag adaptor
 667          */
 668         public static function tagObj( $parser, $frame, $args ) {
 669                 $xpath = false;
 670                 if ( !count( $args ) ) {
 671                         return '';
 672                 }
 673                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 674
 675                 if ( count( $args ) ) {
 676                         $inner = $frame->expand( array_shift( $args ) );
 677                 } else {
 678                         $inner = null;
 679                 }
 680
 681                 $stripList = $parser->getStripList();
 682                 if ( !in_array( $tagName, $stripList ) ) {
 683                         return '<span class="error">' .
 684                                 wfMsg( 'unknown_extension_tag', $tagName ) .
 685                                 '</span>';
 686                 }
 687
 688                 $attributes = array();
 689                 foreach ( $args as $arg ) {
 690                         $bits = $arg->splitArg();
 691                         if ( strval( $bits['index'] ) === '' ) {
 692                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 693                                 $value = trim( $frame->expand( $bits['value'] ) );
 694                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 695                                         $value = isset( $m[1] ) ? $m[1] : '';
 696                                 }
 697                                 $attributes[$name] = $value;
 698                         }
 699                 }
 700
 701                 $params = array(
 702                         'name' => $tagName,
 703                         'inner' => $inner,
 704                         'attributes' => $attributes,
 705                         'close' => "</$tagName>",
 706                 );
 707                 return $parser->extensionSubstitution( $params, $frame );
 708         }
 709
 710         /**
 711          * magic word call for a group convert from LanguageConverter.
 712          */
 713         public static function groupconvert( $parser, $group ) {
 714                 global $wgContLang;
 715                 return $wgContLang->groupConvert( $group );
 716         }
 717 }