includes/parser/CoreParserFunctions.php

   1 <?php
   2 /**
   3  * Parser functions provided by MediaWiki core
   4  *
   5  * @file
   6  */
   7
   8 /**
   9  * Various core parser functions, registered in Parser::firstCallInit()
  10  * @ingroup Parser
  11  */
  12 class CoreParserFunctions {
  13         /**
  14          * @param $parser Parser
  15          * @return void
  16          */
  17         static function register( $parser ) {
  18                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
  19
  20                 # Syntax for arguments (see self::setFunctionHook):
  21                 #  "name for lookup in localized magic words array",
  22                 #  function callback,
  23                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}}
  24                 #    instead of {{#int:...}})
  25
  26                 $parser->setFunctionHook( 'int',              array( __CLASS__, 'intFunction'      ), SFH_NO_HASH );
  27                 $parser->setFunctionHook( 'ns',               array( __CLASS__, 'ns'               ), SFH_NO_HASH );
  28                 $parser->setFunctionHook( 'nse',              array( __CLASS__, 'nse'              ), SFH_NO_HASH );
  29                 $parser->setFunctionHook( 'urlencode',        array( __CLASS__, 'urlencode'        ), SFH_NO_HASH );
  30                 $parser->setFunctionHook( 'lcfirst',          array( __CLASS__, 'lcfirst'          ), SFH_NO_HASH );
  31                 $parser->setFunctionHook( 'ucfirst',          array( __CLASS__, 'ucfirst'          ), SFH_NO_HASH );
  32                 $parser->setFunctionHook( 'lc',               array( __CLASS__, 'lc'               ), SFH_NO_HASH );
  33                 $parser->setFunctionHook( 'uc',               array( __CLASS__, 'uc'               ), SFH_NO_HASH );
  34                 $parser->setFunctionHook( 'localurl',         array( __CLASS__, 'localurl'         ), SFH_NO_HASH );
  35                 $parser->setFunctionHook( 'localurle',        array( __CLASS__, 'localurle'        ), SFH_NO_HASH );
  36                 $parser->setFunctionHook( 'fullurl',          array( __CLASS__, 'fullurl'          ), SFH_NO_HASH );
  37                 $parser->setFunctionHook( 'fullurle',         array( __CLASS__, 'fullurle'         ), SFH_NO_HASH );
  38                 $parser->setFunctionHook( 'canonicalurl',     array( __CLASS__, 'canonicalurl'     ), SFH_NO_HASH );
  39                 $parser->setFunctionHook( 'canonicalurle',    array( __CLASS__, 'canonicalurle'    ), SFH_NO_HASH );
  40                 $parser->setFunctionHook( 'formatnum',        array( __CLASS__, 'formatnum'        ), SFH_NO_HASH );
  41                 $parser->setFunctionHook( 'grammar',          array( __CLASS__, 'grammar'          ), SFH_NO_HASH );
  42                 $parser->setFunctionHook( 'gender',           array( __CLASS__, 'gender'           ), SFH_NO_HASH );
  43                 $parser->setFunctionHook( 'plural',           array( __CLASS__, 'plural'           ), SFH_NO_HASH );
  44                 $parser->setFunctionHook( 'numberofpages',    array( __CLASS__, 'numberofpages'    ), SFH_NO_HASH );
  45                 $parser->setFunctionHook( 'numberofusers',    array( __CLASS__, 'numberofusers'    ), SFH_NO_HASH );
  46                 $parser->setFunctionHook( 'numberofactiveusers', array( __CLASS__, 'numberofactiveusers' ), SFH_NO_HASH );
  47                 $parser->setFunctionHook( 'numberofarticles', array( __CLASS__, 'numberofarticles' ), SFH_NO_HASH );
  48                 $parser->setFunctionHook( 'numberoffiles',    array( __CLASS__, 'numberoffiles'    ), SFH_NO_HASH );
  49                 $parser->setFunctionHook( 'numberofadmins',   array( __CLASS__, 'numberofadmins'   ), SFH_NO_HASH );
  50                 $parser->setFunctionHook( 'numberingroup',    array( __CLASS__, 'numberingroup'    ), SFH_NO_HASH );
  51                 $parser->setFunctionHook( 'numberofedits',    array( __CLASS__, 'numberofedits'    ), SFH_NO_HASH );
  52                 $parser->setFunctionHook( 'numberofviews',    array( __CLASS__, 'numberofviews'    ), SFH_NO_HASH );
  53                 $parser->setFunctionHook( 'language',         array( __CLASS__, 'language'         ), SFH_NO_HASH );
  54                 $parser->setFunctionHook( 'padleft',          array( __CLASS__, 'padleft'          ), SFH_NO_HASH );
  55                 $parser->setFunctionHook( 'padright',         array( __CLASS__, 'padright'         ), SFH_NO_HASH );
  56                 $parser->setFunctionHook( 'anchorencode',     array( __CLASS__, 'anchorencode'     ), SFH_NO_HASH );
  57                 $parser->setFunctionHook( 'special',          array( __CLASS__, 'special'          ) );
  58                 $parser->setFunctionHook( 'defaultsort',      array( __CLASS__, 'defaultsort'      ), SFH_NO_HASH );
  59                 $parser->setFunctionHook( 'filepath',         array( __CLASS__, 'filepath'         ), SFH_NO_HASH );
  60                 $parser->setFunctionHook( 'pagesincategory',  array( __CLASS__, 'pagesincategory'  ), SFH_NO_HASH );
  61                 $parser->setFunctionHook( 'pagesize',         array( __CLASS__, 'pagesize'         ), SFH_NO_HASH );
  62                 $parser->setFunctionHook( 'protectionlevel',  array( __CLASS__, 'protectionlevel'  ), SFH_NO_HASH );
  63                 $parser->setFunctionHook( 'namespace',        array( __CLASS__, 'mwnamespace'      ), SFH_NO_HASH );
  64                 $parser->setFunctionHook( 'namespacee',       array( __CLASS__, 'namespacee'       ), SFH_NO_HASH );
  65                 $parser->setFunctionHook( 'talkspace',        array( __CLASS__, 'talkspace'        ), SFH_NO_HASH );
  66                 $parser->setFunctionHook( 'talkspacee',       array( __CLASS__, 'talkspacee'       ), SFH_NO_HASH );
  67                 $parser->setFunctionHook( 'subjectspace',     array( __CLASS__, 'subjectspace'     ), SFH_NO_HASH );
  68                 $parser->setFunctionHook( 'subjectspacee',    array( __CLASS__, 'subjectspacee'    ), SFH_NO_HASH );
  69                 $parser->setFunctionHook( 'pagename',         array( __CLASS__, 'pagename'         ), SFH_NO_HASH );
  70                 $parser->setFunctionHook( 'pagenamee',        array( __CLASS__, 'pagenamee'        ), SFH_NO_HASH );
  71                 $parser->setFunctionHook( 'fullpagename',     array( __CLASS__, 'fullpagename'     ), SFH_NO_HASH );
  72                 $parser->setFunctionHook( 'fullpagenamee',    array( __CLASS__, 'fullpagenamee'    ), SFH_NO_HASH );
  73                 $parser->setFunctionHook( 'basepagename',     array( __CLASS__, 'basepagename'     ), SFH_NO_HASH );
  74                 $parser->setFunctionHook( 'basepagenamee',    array( __CLASS__, 'basepagenamee'    ), SFH_NO_HASH );
  75                 $parser->setFunctionHook( 'subpagename',      array( __CLASS__, 'subpagename'      ), SFH_NO_HASH );
  76                 $parser->setFunctionHook( 'subpagenamee',     array( __CLASS__, 'subpagenamee'     ), SFH_NO_HASH );
  77                 $parser->setFunctionHook( 'talkpagename',     array( __CLASS__, 'talkpagename'     ), SFH_NO_HASH );
  78                 $parser->setFunctionHook( 'talkpagenamee',    array( __CLASS__, 'talkpagenamee'    ), SFH_NO_HASH );
  79                 $parser->setFunctionHook( 'subjectpagename',  array( __CLASS__, 'subjectpagename'  ), SFH_NO_HASH );
  80                 $parser->setFunctionHook( 'subjectpagenamee', array( __CLASS__, 'subjectpagenamee' ), SFH_NO_HASH );
  81                 $parser->setFunctionHook( 'tag',              array( __CLASS__, 'tagObj'           ), SFH_OBJECT_ARGS );
  82                 $parser->setFunctionHook( 'formatdate',       array( __CLASS__, 'formatDate'       ) );
  83
  84                 if ( $wgAllowDisplayTitle ) {
  85                         $parser->setFunctionHook( 'displaytitle', array( __CLASS__, 'displaytitle' ), SFH_NO_HASH );
  86                 }
  87                 if ( $wgAllowSlowParserFunctions ) {
  88                         $parser->setFunctionHook( 'pagesinnamespace', array( __CLASS__, 'pagesinnamespace' ), SFH_NO_HASH );
  89                 }
  90         }
  91
  92         /**
  93          * @param $parser Parser
  94          * @param string $part1
  95          * @return array
  96          */
  97         static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  98                 if ( strval( $part1 ) !== '' ) {
  99                         $args = array_slice( func_get_args(), 2 );
 100                         $message = wfMessage( $part1, $args )->inLanguage( $parser->getOptions()->getUserLangObj() )->plain();
 101                         return array( $message, 'noparse' => false );
 102                 } else {
 103                         return array( 'found' => false );
 104                 }
 105         }
 106
 107         /**
 108          * @param $parser Parser
 109          * @param  $date
 110          * @param null $defaultPref
 111          * @return mixed|string
 112          */
 113         static function formatDate( $parser, $date, $defaultPref = null ) {
 114                 $df = DateFormatter::getInstance();
 115
 116                 $date = trim( $date );
 117
 118                 $pref = $parser->getOptions()->getDateFormat();
 119
 120                 // Specify a different default date format other than the the normal default
 121                 // iff the user has 'default' for their setting
 122                 if ( $pref == 'default' && $defaultPref )
 123                         $pref = $defaultPref;
 124
 125                 $date = $df->reformat( $pref, $date, array( 'match-whole' ) );
 126                 return $date;
 127         }
 128
 129         static function ns( $parser, $part1 = '' ) {
 130                 global $wgContLang;
 131                 if ( intval( $part1 ) || $part1 == "0" ) {
 132                         $index = intval( $part1 );
 133                 } else {
 134                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 135                 }
 136                 if ( $index !== false ) {
 137                         return $wgContLang->getFormattedNsText( $index );
 138                 } else {
 139                         return array( 'found' => false );
 140                 }
 141         }
 142
 143         static function nse( $parser, $part1 = '' ) {
 144                 return wfUrlencode( str_replace( ' ', '_', self::ns( $parser, $part1 ) ) );
 145         }
 146
 147         /**
 148          * urlencodes a string according to one of three patterns: (bug 22474)
 149          *
 150          * By default (for HTTP "query" strings), spaces are encoded as '+'.
 151          * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
 152          * For links to "wiki"s, or similar software, spaces are encoded as '_',
 153          *
 154          * @param $parser Parser object
 155          * @param $s String: The text to encode.
 156          * @param $arg String (optional): The type of encoding.
 157          * @return string
 158          */
 159         static function urlencode( $parser, $s = '', $arg = null ) {
 160                 static $magicWords = null;
 161                 if ( is_null( $magicWords ) ) {
 162                         $magicWords = new MagicWordArray( array( 'url_path', 'url_query', 'url_wiki' ) );
 163                 }
 164                 switch( $magicWords->matchStartToEnd( $arg ) ) {
 165
 166                         // Encode as though it's a wiki page, '_' for ' '.
 167                         case 'url_wiki':
 168                                 $func = 'wfUrlencode';
 169                                 $s = str_replace( ' ', '_', $s );
 170                                 break;
 171
 172                         // Encode for an HTTP Path, '%20' for ' '.
 173                         case 'url_path':
 174                                 $func = 'rawurlencode';
 175                                 break;
 176
 177                         // Encode for HTTP query, '+' for ' '.
 178                         case 'url_query':
 179                         default:
 180                                 $func = 'urlencode';
 181                 }
 182                 return $parser->markerSkipCallback( $s, $func );
 183         }
 184
 185         static function lcfirst( $parser, $s = '' ) {
 186                 global $wgContLang;
 187                 return $wgContLang->lcfirst( $s );
 188         }
 189
 190         static function ucfirst( $parser, $s = '' ) {
 191                 global $wgContLang;
 192                 return $wgContLang->ucfirst( $s );
 193         }
 194
 195         /**
 196          * @param $parser Parser
 197          * @param string $s
 198          * @return
 199          */
 200         static function lc( $parser, $s = '' ) {
 201                 global $wgContLang;
 202                 return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
 203         }
 204
 205         /**
 206          * @param $parser Parser
 207          * @param string $s
 208          * @return
 209          */
 210         static function uc( $parser, $s = '' ) {
 211                 global $wgContLang;
 212                 return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
 213         }
 214
 215         static function localurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getLocalURL', $s, $arg ); }
 216         static function localurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeLocalURL', $s, $arg ); }
 217         static function fullurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getFullURL', $s, $arg ); }
 218         static function fullurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeFullURL', $s, $arg ); }
 219         static function canonicalurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getCanonicalURL', $s, $arg ); }
 220         static function canonicalurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeCanonicalURL', $s, $arg ); }
 221
 222         static function urlFunction( $func, $s = '', $arg = null ) {
 223                 $title = Title::newFromText( $s );
 224                 # Due to order of execution of a lot of bits, the values might be encoded
 225                 # before arriving here; if that's true, then the title can't be created
 226                 # and the variable will fail. If we can't get a decent title from the first
 227                 # attempt, url-decode and try for a second.
 228                 if( is_null( $title ) )
 229                         $title = Title::newFromURL( urldecode( $s ) );
 230                 if( !is_null( $title ) ) {
 231                         # Convert NS_MEDIA -> NS_FILE
 232                         if( $title->getNamespace() == NS_MEDIA ) {
 233                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 234                         }
 235                         if( !is_null( $arg ) ) {
 236                                 $text = $title->$func( $arg );
 237                         } else {
 238                                 $text = $title->$func();
 239                         }
 240                         return $text;
 241                 } else {
 242                         return array( 'found' => false );
 243                 }
 244         }
 245
 246         /**
 247          * @param $parser Parser
 248          * @param string $num
 249          * @param null $raw
 250          * @return
 251          */
 252         static function formatnum( $parser, $num = '', $raw = null) {
 253                 if ( self::isRaw( $raw ) ) {
 254                         $func = array( $parser->getFunctionLang(), 'parseFormattedNumber' );
 255                 } else {
 256                         $func = array( $parser->getFunctionLang(), 'formatNum' );
 257                 }
 258                 return $parser->markerSkipCallback( $num, $func );
 259         }
 260
 261         /**
 262          * @param $parser Parser
 263          * @param string $case
 264          * @param string $word
 265          * @return
 266          */
 267         static function grammar( $parser, $case = '', $word = '' ) {
 268                 $word = $parser->killMarkers( $word );
 269                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 270         }
 271
 272         /**
 273          * @param $parser Parser
 274          * @param $username string
 275          * @return
 276          */
 277         static function gender( $parser, $username ) {
 278                 wfProfileIn( __METHOD__ );
 279                 $forms = array_slice( func_get_args(), 2 );
 280
 281                 // Some shortcuts to avoid loading user data unnecessarily
 282                 if ( count( $forms ) === 0 ) {
 283                         wfProfileOut( __METHOD__ );
 284                         return '';
 285                 } elseif ( count( $forms ) === 1 ) {
 286                         wfProfileOut( __METHOD__ );
 287                         return $forms[0];
 288                 }
 289
 290                 $username = trim( $username );
 291
 292                 // default
 293                 $gender = User::getDefaultOption( 'gender' );
 294
 295                 // allow prefix.
 296                 $title = Title::newFromText( $username );
 297
 298                 if ( $title && $title->getNamespace() == NS_USER ) {
 299                         $username = $title->getText();
 300                 }
 301
 302                 // check parameter, or use the ParserOptions if in interface message
 303                 $user = User::newFromName( $username );
 304                 if ( $user ) {
 305                         $gender = $user->getOption( 'gender' );
 306                 } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
 307                         $gender = $parser->getOptions()->getUser()->getOption( 'gender' );
 308                 }
 309                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 310                 wfProfileOut( __METHOD__ );
 311                 return $ret;
 312         }
 313
 314         /**
 315          * @param $parser Parser
 316          * @param string $text
 317          * @return
 318          */
 319         static function plural( $parser, $text = '' ) {
 320                 $forms = array_slice( func_get_args(), 2 );
 321                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 322                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 323         }
 324
 325         /**
 326          * Override the title of the page when viewed, provided we've been given a
 327          * title which will normalise to the canonical title
 328          *
 329          * @param $parser Parser: parent parser
 330          * @param $text String: desired title text
 331          * @return String
 332          */
 333         static function displaytitle( $parser, $text = '' ) {
 334                 global $wgRestrictDisplayTitle;
 335
 336                 #parse a limited subset of wiki markup (just the single quote items)
 337                 $text = $parser->doQuotes( $text );
 338
 339                 #remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 340                 $text = preg_replace( '/' . preg_quote( $parser->uniqPrefix(), '/' ) . '.*?'
 341                         . preg_quote( Parser::MARKER_SUFFIX, '/' ) . '/', '', $text );
 342
 343                 #list of disallowed tags for DISPLAYTITLE
 344                 #these will be escaped even though they are allowed in normal wiki text
 345                 $bad = array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 346                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rp', 'br' );
 347
 348                 #only requested titles that normalize to the actual title are allowed through
 349                 #if $wgRestrictDisplayTitle is true (it is by default)
 350                 #mimic the escaping process that occurs in OutputPage::setPageTitle
 351                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $text, null, array(), array(), $bad ) );
 352                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 353
 354                 if( !$wgRestrictDisplayTitle ) {
 355                         $parser->mOutput->setDisplayTitle( $text );
 356                 } else {
 357                         if ( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) ) {
 358                                 $parser->mOutput->setDisplayTitle( $text );
 359                         }
 360                 }
 361
 362                 return '';
 363         }
 364
 365         static function isRaw( $param ) {
 366                 static $mwRaw;
 367                 if ( !$mwRaw ) {
 368                         $mwRaw =& MagicWord::get( 'rawsuffix' );
 369                 }
 370                 if ( is_null( $param ) ) {
 371                         return false;
 372                 } else {
 373                         return $mwRaw->match( $param );
 374                 }
 375         }
 376
 377         static function formatRaw( $num, $raw ) {
 378                 if( self::isRaw( $raw ) ) {
 379                         return $num;
 380                 } else {
 381                         global $wgContLang;
 382                         return $wgContLang->formatNum( $num );
 383                 }
 384         }
 385         static function numberofpages( $parser, $raw = null ) {
 386                 return self::formatRaw( SiteStats::pages(), $raw );
 387         }
 388         static function numberofusers( $parser, $raw = null ) {
 389                 return self::formatRaw( SiteStats::users(), $raw );
 390         }
 391         static function numberofactiveusers( $parser, $raw = null ) {
 392                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 393         }
 394         static function numberofarticles( $parser, $raw = null ) {
 395                 return self::formatRaw( SiteStats::articles(), $raw );
 396         }
 397         static function numberoffiles( $parser, $raw = null ) {
 398                 return self::formatRaw( SiteStats::images(), $raw );
 399         }
 400         static function numberofadmins( $parser, $raw = null ) {
 401                 return self::formatRaw( SiteStats::numberingroup('sysop'), $raw );
 402         }
 403         static function numberofedits( $parser, $raw = null ) {
 404                 return self::formatRaw( SiteStats::edits(), $raw );
 405         }
 406         static function numberofviews( $parser, $raw = null ) {
 407                 return self::formatRaw( SiteStats::views(), $raw );
 408         }
 409         static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 410                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 411         }
 412         static function numberingroup( $parser, $name = '', $raw = null) {
 413                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 414         }
 415
 416
 417         /**
 418          * Given a title, return the namespace name that would be given by the
 419          * corresponding magic word
 420          * Note: function name changed to "mwnamespace" rather than "namespace"
 421          * to not break PHP 5.3
 422          * @return mixed|string
 423          */
 424         static function mwnamespace( $parser, $title = null ) {
 425                 $t = Title::newFromText( $title );
 426                 if ( is_null( $t ) )
 427                         return '';
 428                 return str_replace( '_', ' ', $t->getNsText() );
 429         }
 430         static function namespacee( $parser, $title = null ) {
 431                 $t = Title::newFromText( $title );
 432                 if ( is_null( $t ) )
 433                         return '';
 434                 return wfUrlencode( $t->getNsText() );
 435         }
 436         static function talkspace( $parser, $title = null ) {
 437                 $t = Title::newFromText( $title );
 438                 if ( is_null( $t ) || !$t->canTalk() )
 439                         return '';
 440                 return str_replace( '_', ' ', $t->getTalkNsText() );
 441         }
 442         static function talkspacee( $parser, $title = null ) {
 443                 $t = Title::newFromText( $title );
 444                 if ( is_null( $t ) || !$t->canTalk() )
 445                         return '';
 446                 return wfUrlencode( $t->getTalkNsText() );
 447         }
 448         static function subjectspace( $parser, $title = null ) {
 449                 $t = Title::newFromText( $title );
 450                 if ( is_null( $t ) )
 451                         return '';
 452                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 453         }
 454         static function subjectspacee( $parser, $title = null ) {
 455                 $t = Title::newFromText( $title );
 456                 if ( is_null( $t ) )
 457                         return '';
 458                 return wfUrlencode( $t->getSubjectNsText() );
 459         }
 460
 461         /**
 462          * Functions to get and normalize pagenames, corresponding to the magic words
 463          * of the same names
 464          * @return String
 465          */
 466         static function pagename( $parser, $title = null ) {
 467                 $t = Title::newFromText( $title );
 468                 if ( is_null( $t ) )
 469                         return '';
 470                 return wfEscapeWikiText( $t->getText() );
 471         }
 472         static function pagenamee( $parser, $title = null ) {
 473                 $t = Title::newFromText( $title );
 474                 if ( is_null( $t ) )
 475                         return '';
 476                 return wfEscapeWikiText( $t->getPartialURL() );
 477         }
 478         static function fullpagename( $parser, $title = null ) {
 479                 $t = Title::newFromText( $title );
 480                 if ( is_null( $t ) || !$t->canTalk() )
 481                         return '';
 482                 return wfEscapeWikiText( $t->getPrefixedText() );
 483         }
 484         static function fullpagenamee( $parser, $title = null ) {
 485                 $t = Title::newFromText( $title );
 486                 if ( is_null( $t ) || !$t->canTalk() )
 487                         return '';
 488                 return wfEscapeWikiText( $t->getPrefixedURL() );
 489         }
 490         static function subpagename( $parser, $title = null ) {
 491                 $t = Title::newFromText( $title );
 492                 if ( is_null( $t ) )
 493                         return '';
 494                 return wfEscapeWikiText( $t->getSubpageText() );
 495         }
 496         static function subpagenamee( $parser, $title = null ) {
 497                 $t = Title::newFromText( $title );
 498                 if ( is_null( $t ) )
 499                         return '';
 500                 return wfEscapeWikiText( $t->getSubpageUrlForm() );
 501         }
 502         static function basepagename( $parser, $title = null ) {
 503                 $t = Title::newFromText( $title );
 504                 if ( is_null( $t ) )
 505                         return '';
 506                 return wfEscapeWikiText( $t->getBaseText() );
 507         }
 508         static function basepagenamee( $parser, $title = null ) {
 509                 $t = Title::newFromText( $title );
 510                 if ( is_null( $t ) )
 511                         return '';
 512                 return wfEscapeWikiText( wfUrlEncode( str_replace( ' ', '_', $t->getBaseText() ) ) );
 513         }
 514         static function talkpagename( $parser, $title = null ) {
 515                 $t = Title::newFromText( $title );
 516                 if ( is_null( $t ) || !$t->canTalk() )
 517                         return '';
 518                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 519         }
 520         static function talkpagenamee( $parser, $title = null ) {
 521                 $t = Title::newFromText( $title );
 522                 if ( is_null( $t ) || !$t->canTalk() )
 523                         return '';
 524                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedUrl() );
 525         }
 526         static function subjectpagename( $parser, $title = null ) {
 527                 $t = Title::newFromText( $title );
 528                 if ( is_null( $t ) )
 529                         return '';
 530                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 531         }
 532         static function subjectpagenamee( $parser, $title = null ) {
 533                 $t = Title::newFromText( $title );
 534                 if ( is_null( $t ) )
 535                         return '';
 536                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedUrl() );
 537         }
 538
 539         /**
 540          * Return the number of pages in the given category, or 0 if it's nonexis-
 541          * tent.  This is an expensive parser function and can't be called too many
 542          * times per page.
 543          * @return string
 544          */
 545         static function pagesincategory( $parser, $name = '', $raw = null ) {
 546                 static $cache = array();
 547                 $category = Category::newFromName( $name );
 548
 549                 if( !is_object( $category ) ) {
 550                         $cache[$name] = 0;
 551                         return self::formatRaw( 0, $raw );
 552                 }
 553
 554                 # Normalize name for cache
 555                 $name = $category->getName();
 556
 557                 $count = 0;
 558                 if( isset( $cache[$name] ) ) {
 559                         $count = $cache[$name];
 560                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 561                         $count = $cache[$name] = (int)$category->getPageCount();
 562                 }
 563                 return self::formatRaw( $count, $raw );
 564         }
 565
 566         /**
 567          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 568          * expensive parser function and can't be called too many times per page.
 569          *
 570          * @todo FIXME: This doesn't work correctly on preview for getting the size
 571          *   of the current page.
 572          * @todo FIXME: Title::getLength() documentation claims that it adds things
 573          *   to the link cache, so the local cache here should be unnecessary, but
 574          *   in fact calling getLength() repeatedly for the same $page does seem to
 575          *   run one query for each call?
 576          * @todo Document parameters
 577          *
 578          * @param $parser Parser
 579          * @param $page String TODO DOCUMENT (Default: empty string)
 580          * @param $raw TODO DOCUMENT (Default: null)
 581          * @return string
 582          */
 583         static function pagesize( $parser, $page = '', $raw = null ) {
 584                 static $cache = array();
 585                 $title = Title::newFromText( $page );
 586
 587                 if( !is_object( $title ) ) {
 588                         $cache[$page] = 0;
 589                         return self::formatRaw( 0, $raw );
 590                 }
 591
 592                 # Normalize name for cache
 593                 $page = $title->getPrefixedText();
 594
 595                 $length = 0;
 596                 if( isset( $cache[$page] ) ) {
 597                         $length = $cache[$page];
 598                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 599                         $rev = Revision::newFromTitle( $title );
 600                         $id = $rev ? $rev->getPage() : 0;
 601                         $length = $cache[$page] = $rev ? $rev->getSize() : 0;
 602
 603                         // Register dependency in templatelinks
 604                         $parser->mOutput->addTemplate( $title, $id, $rev ? $rev->getId() : 0 );
 605                 }
 606                 return self::formatRaw( $length, $raw );
 607         }
 608
 609         /**
 610         * Returns the requested protection level for the current page
 611          * @return string
 612          */
 613         static function protectionlevel( $parser, $type = '' ) {
 614                 $restrictions = $parser->mTitle->getRestrictions( strtolower( $type ) );
 615                 # Title::getRestrictions returns an array, its possible it may have
 616                 # multiple values in the future
 617                 return implode( $restrictions, ',' );
 618         }
 619
 620         /**
 621          * Gives language names.
 622          * @param $parser Parser
 623          * @param $code String  Language code (of which to get name)
 624          * @param $inLanguage String  Language code (in which to get name)
 625          * @return String
 626          */
 627         static function language( $parser, $code = '', $inLanguage = '' ) {
 628                 $code = strtolower( $code );
 629                 $inLanguage = strtolower( $inLanguage );
 630                 $lang = Language::fetchLanguageName( $code, $inLanguage );
 631                 return $lang !== '' ? $lang : wfBCP47( $code );
 632         }
 633
 634         /**
 635          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 636          * @return string
 637          */
 638         static function pad( $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT ) {
 639                 $padding = $parser->killMarkers( $padding );
 640                 $lengthOfPadding = mb_strlen( $padding );
 641                 if ( $lengthOfPadding == 0 ) return $string;
 642
 643                 # The remaining length to add counts down to 0 as padding is added
 644                 $length = min( $length, 500 ) - mb_strlen( $string );
 645                 # $finalPadding is just $padding repeated enough times so that
 646                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 647                 $finalPadding = '';
 648                 while ( $length > 0 ) {
 649                         # If $length < $lengthofPadding, truncate $padding so we get the
 650                         # exact length desired.
 651                         $finalPadding .= mb_substr( $padding, 0, $length );
 652                         $length -= $lengthOfPadding;
 653                 }
 654
 655                 if ( $direction == STR_PAD_LEFT ) {
 656                         return $finalPadding . $string;
 657                 } else {
 658                         return $string . $finalPadding;
 659                 }
 660         }
 661
 662         static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 663                 return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
 664         }
 665
 666         static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 667                 return self::pad( $parser, $string, $length, $padding );
 668         }
 669
 670         /**
 671          * @param $parser Parser
 672          * @param  $text
 673          * @return string
 674          */
 675         static function anchorencode( $parser, $text ) {
 676                 $text = $parser->killMarkers( $text );
 677                 return substr( $parser->guessSectionNameFromWikiText( $text ), 1);
 678         }
 679
 680         static function special( $parser, $text ) {
 681                 list( $page, $subpage ) = SpecialPageFactory::resolveAlias( $text );
 682                 if ( $page ) {
 683                         $title = SpecialPage::getTitleFor( $page, $subpage );
 684                         return $title;
 685                 } else {
 686                         return wfMsgForContent( 'nosuchspecialpage' );
 687                 }
 688         }
 689
 690         /**
 691          * @param $parser Parser
 692          * @param $text String The sortkey to use
 693          * @param $uarg String Either "noreplace" or "noerror" (in en)
 694          *   both suppress errors, and noreplace does nothing if
 695          *   a default sortkey already exists.
 696          * @return string
 697          */
 698         public static function defaultsort( $parser, $text, $uarg = '' ) {
 699                 static $magicWords = null;
 700                 if ( is_null( $magicWords ) ) {
 701                         $magicWords = new MagicWordArray( array( 'defaultsort_noerror', 'defaultsort_noreplace' ) );
 702                 }
 703                 $arg = $magicWords->matchStartToEnd( $uarg );
 704
 705                 $text = trim( $text );
 706                 if( strlen( $text ) == 0 )
 707                         return '';
 708                 $old = $parser->getCustomDefaultSort();
 709                 if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
 710                         $parser->setDefaultSort( $text );
 711                 }
 712
 713                 if( $old === false || $old == $text || $arg ) {
 714                         return '';
 715                 } else {
 716                         return( '<span class="error">' .
 717                                 wfMsgForContent( 'duplicate-defaultsort',
 718                                                  htmlspecialchars( $old ),
 719                                                  htmlspecialchars( $text ) ) .
 720                                 '</span>' );
 721                 }
 722         }
 723
 724         // Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}} or {{filepath|300|nowiki}}
 725         public static function filepath( $parser, $name='', $argA='', $argB='' ) {
 726                 $file = wfFindFile( $name );
 727                 $size = '';
 728                 $argA_int = intval( $argA );
 729                 $argB_int = intval( $argB );
 730
 731                 if ( $argB_int > 0 ) {
 732                         // {{filepath: | option | size }}
 733                         $size = $argB_int;
 734                         $option = $argA;
 735
 736                 } elseif ( $argA_int > 0 ) {
 737                         // {{filepath: | size [|option] }}
 738                         $size = $argA_int;
 739                         $option = $argB;
 740
 741                 } else {
 742                         // {{filepath: [|option] }}
 743                         $option = $argA;
 744                 }
 745
 746                 if ( $file ) {
 747                         $url = $file->getFullUrl();
 748
 749                         // If a size is requested...
 750                         if ( is_integer( $size ) ) {
 751                                 $mto = $file->transform( array( 'width' => $size ) );
 752                                 // ... and we can
 753                                 if ( $mto && !$mto->isError() ) {
 754                                         // ... change the URL to point to a thumbnail.
 755                                         $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
 756                                 }
 757                         }
 758                         if ( $option == 'nowiki' ) {
 759                                 return array( $url, 'nowiki' => true );
 760                         }
 761                         return $url;
 762                 } else {
 763                         return '';
 764                 }
 765         }
 766
 767         /**
 768          * Parser function to extension tag adaptor
 769          * @return string
 770          */
 771         public static function tagObj( $parser, $frame, $args ) {
 772                 if ( !count( $args ) ) {
 773                         return '';
 774                 }
 775                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 776
 777                 if ( count( $args ) ) {
 778                         $inner = $frame->expand( array_shift( $args ) );
 779                 } else {
 780                         $inner = null;
 781                 }
 782
 783                 $stripList = $parser->getStripList();
 784                 if ( !in_array( $tagName, $stripList ) ) {
 785                         return '<span class="error">' .
 786                                 wfMsgForContent( 'unknown_extension_tag', $tagName ) .
 787                                 '</span>';
 788                 }
 789
 790                 $attributes = array();
 791                 foreach ( $args as $arg ) {
 792                         $bits = $arg->splitArg();
 793                         if ( strval( $bits['index'] ) === '' ) {
 794                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 795                                 $value = trim( $frame->expand( $bits['value'] ) );
 796                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 797                                         $value = isset( $m[1] ) ? $m[1] : '';
 798                                 }
 799                                 $attributes[$name] = $value;
 800                         }
 801                 }
 802
 803                 $params = array(
 804                         'name' => $tagName,
 805                         'inner' => $inner,
 806                         'attributes' => $attributes,
 807                         'close' => "</$tagName>",
 808                 );
 809                 return $parser->extensionSubstitution( $params, $frame );
 810         }
 811 }