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( 'nse',              array( __CLASS__, 'nse'              ), SFH_NO_HASH );
  20                 $parser->setFunctionHook( 'urlencode',        array( __CLASS__, 'urlencode'        ), SFH_NO_HASH );
  21                 $parser->setFunctionHook( 'lcfirst',          array( __CLASS__, 'lcfirst'          ), SFH_NO_HASH );
  22                 $parser->setFunctionHook( 'ucfirst',          array( __CLASS__, 'ucfirst'          ), SFH_NO_HASH );
  23                 $parser->setFunctionHook( 'lc',               array( __CLASS__, 'lc'               ), SFH_NO_HASH );
  24                 $parser->setFunctionHook( 'uc',               array( __CLASS__, 'uc'               ), SFH_NO_HASH );
  25                 $parser->setFunctionHook( 'localurl',         array( __CLASS__, 'localurl'         ), SFH_NO_HASH );
  26                 $parser->setFunctionHook( 'localurle',        array( __CLASS__, 'localurle'        ), SFH_NO_HASH );
  27                 $parser->setFunctionHook( 'fullurl',          array( __CLASS__, 'fullurl'          ), SFH_NO_HASH );
  28                 $parser->setFunctionHook( 'fullurle',         array( __CLASS__, 'fullurle'         ), SFH_NO_HASH );
  29                 $parser->setFunctionHook( 'formatnum',        array( __CLASS__, 'formatnum'        ), SFH_NO_HASH );
  30                 $parser->setFunctionHook( 'grammar',          array( __CLASS__, 'grammar'          ), SFH_NO_HASH );
  31                 $parser->setFunctionHook( 'gender',           array( __CLASS__, 'gender'           ), SFH_NO_HASH );
  32                 $parser->setFunctionHook( 'plural',           array( __CLASS__, 'plural'           ), SFH_NO_HASH );
  33                 $parser->setFunctionHook( 'numberofpages',    array( __CLASS__, 'numberofpages'    ), SFH_NO_HASH );
  34                 $parser->setFunctionHook( 'numberofusers',    array( __CLASS__, 'numberofusers'    ), SFH_NO_HASH );
  35                 $parser->setFunctionHook( 'numberofactiveusers', array( __CLASS__, 'numberofactiveusers' ), SFH_NO_HASH );
  36                 $parser->setFunctionHook( 'numberofarticles', array( __CLASS__, 'numberofarticles' ), SFH_NO_HASH );
  37                 $parser->setFunctionHook( 'numberoffiles',    array( __CLASS__, 'numberoffiles'    ), SFH_NO_HASH );
  38                 $parser->setFunctionHook( 'numberofadmins',   array( __CLASS__, 'numberofadmins'   ), SFH_NO_HASH );
  39                 $parser->setFunctionHook( 'numberingroup',    array( __CLASS__, 'numberingroup'    ), SFH_NO_HASH );
  40                 $parser->setFunctionHook( 'numberofedits',    array( __CLASS__, 'numberofedits'    ), SFH_NO_HASH );
  41                 $parser->setFunctionHook( 'numberofviews',    array( __CLASS__, 'numberofviews'    ), SFH_NO_HASH );
  42                 $parser->setFunctionHook( 'language',         array( __CLASS__, 'language'         ), SFH_NO_HASH );
  43                 $parser->setFunctionHook( 'padleft',          array( __CLASS__, 'padleft'          ), SFH_NO_HASH );
  44                 $parser->setFunctionHook( 'padright',         array( __CLASS__, 'padright'         ), SFH_NO_HASH );
  45                 $parser->setFunctionHook( 'anchorencode',     array( __CLASS__, 'anchorencode'     ), SFH_NO_HASH );
  46                 $parser->setFunctionHook( 'special',          array( __CLASS__, 'special'          ) );
  47                 $parser->setFunctionHook( 'defaultsort',      array( __CLASS__, 'defaultsort'      ), SFH_NO_HASH );
  48                 $parser->setFunctionHook( 'filepath',         array( __CLASS__, 'filepath'         ), SFH_NO_HASH );
  49                 $parser->setFunctionHook( 'pagesincategory',  array( __CLASS__, 'pagesincategory'  ), SFH_NO_HASH );
  50                 $parser->setFunctionHook( 'pagesize',         array( __CLASS__, 'pagesize'         ), SFH_NO_HASH );
  51                 $parser->setFunctionHook( 'protectionlevel',  array( __CLASS__, 'protectionlevel'  ), SFH_NO_HASH );
  52                 $parser->setFunctionHook( 'namespace',        array( __CLASS__, 'mwnamespace'      ), SFH_NO_HASH );
  53                 $parser->setFunctionHook( 'namespacee',       array( __CLASS__, 'namespacee'       ), SFH_NO_HASH );
  54                 $parser->setFunctionHook( 'talkspace',        array( __CLASS__, 'talkspace'        ), SFH_NO_HASH );
  55                 $parser->setFunctionHook( 'talkspacee',       array( __CLASS__, 'talkspacee'       ), SFH_NO_HASH );
  56                 $parser->setFunctionHook( 'subjectspace',     array( __CLASS__, 'subjectspace'     ), SFH_NO_HASH );
  57                 $parser->setFunctionHook( 'subjectspacee',    array( __CLASS__, 'subjectspacee'    ), SFH_NO_HASH );
  58                 $parser->setFunctionHook( 'pagename',         array( __CLASS__, 'pagename'         ), SFH_NO_HASH );
  59                 $parser->setFunctionHook( 'pagenamee',        array( __CLASS__, 'pagenamee'        ), SFH_NO_HASH );
  60                 $parser->setFunctionHook( 'fullpagename',     array( __CLASS__, 'fullpagename'     ), SFH_NO_HASH );
  61                 $parser->setFunctionHook( 'fullpagenamee',    array( __CLASS__, 'fullpagenamee'    ), SFH_NO_HASH );
  62                 $parser->setFunctionHook( 'basepagename',     array( __CLASS__, 'basepagename'     ), SFH_NO_HASH );
  63                 $parser->setFunctionHook( 'basepagenamee',    array( __CLASS__, 'basepagenamee'    ), SFH_NO_HASH );
  64                 $parser->setFunctionHook( 'subpagename',      array( __CLASS__, 'subpagename'      ), SFH_NO_HASH );
  65                 $parser->setFunctionHook( 'subpagenamee',     array( __CLASS__, 'subpagenamee'     ), SFH_NO_HASH );
  66                 $parser->setFunctionHook( 'talkpagename',     array( __CLASS__, 'talkpagename'     ), SFH_NO_HASH );
  67                 $parser->setFunctionHook( 'talkpagenamee',    array( __CLASS__, 'talkpagenamee'    ), SFH_NO_HASH );
  68                 $parser->setFunctionHook( 'subjectpagename',  array( __CLASS__, 'subjectpagename'  ), SFH_NO_HASH );
  69                 $parser->setFunctionHook( 'subjectpagenamee', array( __CLASS__, 'subjectpagenamee' ), SFH_NO_HASH );
  70                 $parser->setFunctionHook( 'tag',              array( __CLASS__, 'tagObj'           ), SFH_OBJECT_ARGS );
  71                 $parser->setFunctionHook( 'formatdate',           array( __CLASS__, 'formatDate'           ) );
  72
  73                 if ( $wgAllowDisplayTitle ) {
  74                         $parser->setFunctionHook( 'displaytitle', array( __CLASS__, 'displaytitle' ), SFH_NO_HASH );
  75                 }
  76                 if ( $wgAllowSlowParserFunctions ) {
  77                         $parser->setFunctionHook( 'pagesinnamespace', array( __CLASS__, 'pagesinnamespace' ), SFH_NO_HASH );
  78                 }
  79         }
  80
  81         static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  82                 if ( strval( $part1 ) !== '' ) {
  83                         $args = array_slice( func_get_args(), 2 );
  84                         $message = wfMsgGetKey( $part1, true, false, false );
  85                         $message = wfMsgReplaceArgs( $message, $args );
  86                         $message = $parser->replaceVariables( $message ); // like $wgMessageCache->transform()
  87                         return $message;
  88                 } else {
  89                         return array( 'found' => false );
  90                 }
  91         }
  92
  93         static function formatDate( $parser, $date, $defaultPref = null ) {
  94                 $df = DateFormatter::getInstance();
  95
  96                 $date = trim($date);
  97
  98                 $pref = $parser->mOptions->getDateFormat();
  99
 100                 // Specify a different default date format other than the the normal default
 101                 // iff the user has 'default' for their setting
 102                 if ($pref == 'default' && $defaultPref)
 103                         $pref = $defaultPref;
 104
 105                 $date = $df->reformat( $pref, $date, array('match-whole') );
 106                 return $date;
 107         }
 108
 109         static function ns( $parser, $part1 = '' ) {
 110                 global $wgContLang;
 111                 if ( intval( $part1 ) || $part1 == "0" ) {
 112                         $index = intval( $part1 );
 113                 } else {
 114                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
 115                 }
 116                 if ( $index !== false ) {
 117                         return $wgContLang->getFormattedNsText( $index );
 118                 } else {
 119                         return array( 'found' => false );
 120                 }
 121         }
 122
 123         static function nse( $parser, $part1 = '' ) {
 124                 return wfUrlencode( str_replace( ' ', '_', self::ns( $parser, $part1 ) ) );
 125         }
 126
 127         static function urlencode( $parser, $s = '' ) {
 128                 return urlencode( $s );
 129         }
 130
 131         static function lcfirst( $parser, $s = '' ) {
 132                 global $wgContLang;
 133                 return $wgContLang->lcfirst( $s );
 134         }
 135
 136         static function ucfirst( $parser, $s = '' ) {
 137                 global $wgContLang;
 138                 return $wgContLang->ucfirst( $s );
 139         }
 140
 141         static function lc( $parser, $s = '' ) {
 142                 global $wgContLang;
 143                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 144                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
 145                 } else {
 146                         return $wgContLang->lc( $s );
 147                 }
 148         }
 149
 150         static function uc( $parser, $s = '' ) {
 151                 global $wgContLang;
 152                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 153                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
 154                 } else {
 155                         return $wgContLang->uc( $s );
 156                 }
 157         }
 158
 159         static function localurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getLocalURL', $s, $arg ); }
 160         static function localurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeLocalURL', $s, $arg ); }
 161         static function fullurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getFullURL', $s, $arg ); }
 162         static function fullurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeFullURL', $s, $arg ); }
 163
 164         static function urlFunction( $func, $s = '', $arg = null ) {
 165                 $title = Title::newFromText( $s );
 166                 # Due to order of execution of a lot of bits, the values might be encoded
 167                 # before arriving here; if that's true, then the title can't be created
 168                 # and the variable will fail. If we can't get a decent title from the first
 169                 # attempt, url-decode and try for a second.
 170                 if( is_null( $title ) )
 171                         $title = Title::newFromUrl( urldecode( $s ) );
 172                 if( !is_null( $title ) ) {
 173                         # Convert NS_MEDIA -> NS_FILE
 174                         if( $title->getNamespace() == NS_MEDIA ) {
 175                                 $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 176                         }
 177                         if( !is_null( $arg ) ) {
 178                                 $text = $title->$func( $arg );
 179                         } else {
 180                                 $text = $title->$func();
 181                         }
 182                         return $text;
 183                 } else {
 184                         return array( 'found' => false );
 185                 }
 186         }
 187
 188         static function formatNum( $parser, $num = '', $raw = null) {
 189                 if ( self::israw( $raw ) ) {
 190                         return $parser->getFunctionLang()->parseFormattedNumber( $num );
 191                 } else {
 192                         return $parser->getFunctionLang()->formatNum( $num );
 193                 }
 194         }
 195
 196         static function grammar( $parser, $case = '', $word = '' ) {
 197                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 198         }
 199
 200         static function gender( $parser, $user ) {
 201                 wfProfileIn( __METHOD__ );
 202                 $forms = array_slice( func_get_args(), 2);
 203
 204                 // default
 205                 $gender = User::getDefaultOption( 'gender' );
 206
 207                 // allow prefix.
 208                 $title = Title::newFromText( $user );
 209
 210                 if (is_object( $title ) && $title->getNamespace() == NS_USER)
 211                         $user = $title->getText();
 212
 213                 // check parameter, or use $wgUser if in interface message
 214                 $user = User::newFromName( $user );
 215                 if ( $user ) {
 216                         $gender = $user->getOption( 'gender' );
 217                 } elseif ( $parser->mOptions->getInterfaceMessage() ) {
 218                         global $wgUser;
 219                         $gender = $wgUser->getOption( 'gender' );
 220                 }
 221                 $ret = $parser->getFunctionLang()->gender( $gender, $forms );
 222                 wfProfileOut( __METHOD__ );
 223                 return $ret;
 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, $text = '' ) {
 240                 global $wgRestrictDisplayTitle;
 241
 242                 #parse a limited subset of wiki markup (just the single quote items)
 243                 $text = $parser->doQuotes( $text );
 244
 245                 #remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
 246                 $text = preg_replace( '/' . preg_quote( $parser->uniqPrefix(), '/' ) . '.*?'
 247                         . preg_quote( Parser::MARKER_SUFFIX, '/' ) . '/', '', $text );
 248
 249                 #list of disallowed tags for DISPLAYTITLE
 250                 #these will be escaped even though they are allowed in normal wiki text
 251                 $bad = array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
 252                         'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rp', 'br' );
 253
 254                 #only requested titles that normalize to the actual title are allowed through
 255                 #if $wgRestrictDisplayTitle is true (it is by default)
 256                 #mimic the escaping process that occurs in OutputPage::setPageTitle
 257                 $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $text, null, array(), array(), $bad ) );
 258                 $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );
 259
 260                 if( !$wgRestrictDisplayTitle ) {
 261                         $parser->mOutput->setDisplayTitle( $text );
 262                 } else {
 263                         if ( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) ) {
 264                                 $parser->mOutput->setDisplayTitle( $text );
 265                         }
 266                 }
 267
 268                 return '';
 269         }
 270
 271         static function isRaw( $param ) {
 272                 static $mwRaw;
 273                 if ( !$mwRaw ) {
 274                         $mwRaw =& MagicWord::get( 'rawsuffix' );
 275                 }
 276                 if ( is_null( $param ) ) {
 277                         return false;
 278                 } else {
 279                         return $mwRaw->match( $param );
 280                 }
 281         }
 282
 283         static function formatRaw( $num, $raw ) {
 284                 if( self::isRaw( $raw ) ) {
 285                         return $num;
 286                 } else {
 287                         global $wgContLang;
 288                         return $wgContLang->formatNum( $num );
 289                 }
 290         }
 291         static function numberofpages( $parser, $raw = null ) {
 292                 return self::formatRaw( SiteStats::pages(), $raw );
 293         }
 294         static function numberofusers( $parser, $raw = null ) {
 295                 return self::formatRaw( SiteStats::users(), $raw );
 296         }
 297         static function numberofactiveusers( $parser, $raw = null ) {
 298                 return self::formatRaw( SiteStats::activeUsers(), $raw );
 299         }
 300         static function numberofarticles( $parser, $raw = null ) {
 301                 return self::formatRaw( SiteStats::articles(), $raw );
 302         }
 303         static function numberoffiles( $parser, $raw = null ) {
 304                 return self::formatRaw( SiteStats::images(), $raw );
 305         }
 306         static function numberofadmins( $parser, $raw = null ) {
 307                 return self::formatRaw( SiteStats::numberingroup('sysop'), $raw );
 308         }
 309         static function numberofedits( $parser, $raw = null ) {
 310                 return self::formatRaw( SiteStats::edits(), $raw );
 311         }
 312         static function numberofviews( $parser, $raw = null ) {
 313                 return self::formatRaw( SiteStats::views(), $raw );
 314         }
 315         static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 316                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 317         }
 318         static function numberingroup( $parser, $name = '', $raw = null) {
 319                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 320         }
 321
 322
 323         /**
 324          * Given a title, return the namespace name that would be given by the
 325          * corresponding magic word
 326          * Note: function name changed to "mwnamespace" rather than "namespace"
 327          * to not break PHP 5.3
 328          */
 329         static function mwnamespace( $parser, $title = null ) {
 330                 $t = Title::newFromText( $title );
 331                 if ( is_null($t) )
 332                         return '';
 333                 return str_replace( '_', ' ', $t->getNsText() );
 334         }
 335         static function namespacee( $parser, $title = null ) {
 336                 $t = Title::newFromText( $title );
 337                 if ( is_null($t) )
 338                         return '';
 339                 return wfUrlencode( $t->getNsText() );
 340         }
 341         static function talkspace( $parser, $title = null ) {
 342                 $t = Title::newFromText( $title );
 343                 if ( is_null($t) || !$t->canTalk() )
 344                         return '';
 345                 return str_replace( '_', ' ', $t->getTalkNsText() );
 346         }
 347         static function talkspacee( $parser, $title = null ) {
 348                 $t = Title::newFromText( $title );
 349                 if ( is_null($t) || !$t->canTalk() )
 350                         return '';
 351                 return wfUrlencode( $t->getTalkNsText() );
 352         }
 353         static function subjectspace( $parser, $title = null ) {
 354                 $t = Title::newFromText( $title );
 355                 if ( is_null($t) )
 356                         return '';
 357                 return str_replace( '_', ' ', $t->getSubjectNsText() );
 358         }
 359         static function subjectspacee( $parser, $title = null ) {
 360                 $t = Title::newFromText( $title );
 361                 if ( is_null($t) )
 362                         return '';
 363                 return wfUrlencode( $t->getSubjectNsText() );
 364         }
 365         /*
 366          * Functions to get and normalize pagenames, corresponding to the magic words
 367          * of the same names
 368         */
 369         static function pagename( $parser, $title = null ) {
 370                 $t = Title::newFromText( $title );
 371                 if ( is_null($t) )
 372                         return '';
 373                 return wfEscapeWikiText( $t->getText() );
 374         }
 375         static function pagenamee( $parser, $title = null ) {
 376                 $t = Title::newFromText( $title );
 377                 if ( is_null($t) )
 378                         return '';
 379                 return $t->getPartialURL();
 380         }
 381         static function fullpagename( $parser, $title = null ) {
 382                 $t = Title::newFromText( $title );
 383                 if ( is_null($t) || !$t->canTalk() )
 384                         return '';
 385                 return wfEscapeWikiText( $t->getPrefixedText() );
 386         }
 387         static function fullpagenamee( $parser, $title = null ) {
 388                 $t = Title::newFromText( $title );
 389                 if ( is_null($t) || !$t->canTalk() )
 390                         return '';
 391                 return $t->getPrefixedURL();
 392         }
 393         static function subpagename( $parser, $title = null ) {
 394                 $t = Title::newFromText( $title );
 395                 if ( is_null($t) )
 396                         return '';
 397                 return $t->getSubpageText();
 398         }
 399         static function subpagenamee( $parser, $title = null ) {
 400                 $t = Title::newFromText( $title );
 401                 if ( is_null($t) )
 402                         return '';
 403                 return $t->getSubpageUrlForm();
 404         }
 405         static function basepagename( $parser, $title = null ) {
 406                 $t = Title::newFromText( $title );
 407                 if ( is_null($t) )
 408                         return '';
 409                 return $t->getBaseText();
 410         }
 411         static function basepagenamee( $parser, $title = null ) {
 412                 $t = Title::newFromText( $title );
 413                 if ( is_null($t) )
 414                         return '';
 415                 return wfUrlEncode( str_replace( ' ', '_', $t->getBaseText() ) );
 416         }
 417         static function talkpagename( $parser, $title = null ) {
 418                 $t = Title::newFromText( $title );
 419                 if ( is_null($t) || !$t->canTalk() )
 420                         return '';
 421                 return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
 422         }
 423         static function talkpagenamee( $parser, $title = null ) {
 424                 $t = Title::newFromText( $title );
 425                 if ( is_null($t) || !$t->canTalk() )
 426                         return '';
 427                 return $t->getTalkPage()->getPrefixedUrl();
 428         }
 429         static function subjectpagename( $parser, $title = null ) {
 430                 $t = Title::newFromText( $title );
 431                 if ( is_null($t) )
 432                         return '';
 433                 return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
 434         }
 435         static function subjectpagenamee( $parser, $title = null ) {
 436                 $t = Title::newFromText( $title );
 437                 if ( is_null($t) )
 438                         return '';
 439                 return $t->getSubjectPage()->getPrefixedUrl();
 440         }
 441
 442         /**
 443          * Return the number of pages in the given category, or 0 if it's nonexis-
 444          * tent.  This is an expensive parser function and can't be called too many
 445          * times per page.
 446          */
 447         static function pagesincategory( $parser, $name = '', $raw = null ) {
 448                 static $cache = array();
 449                 $category = Category::newFromName( $name );
 450
 451                 if( !is_object( $category ) ) {
 452                         $cache[$name] = 0;
 453                         return self::formatRaw( 0, $raw );
 454                 }
 455
 456                 # Normalize name for cache
 457                 $name = $category->getName();
 458
 459                 $count = 0;
 460                 if( isset( $cache[$name] ) ) {
 461                         $count = $cache[$name];
 462                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 463                         $count = $cache[$name] = (int)$category->getPageCount();
 464                 }
 465                 return self::formatRaw( $count, $raw );
 466         }
 467
 468         /**
 469          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 470          * expensive parser function and can't be called too many times per page.
 471          *
 472          * @FIXME This doesn't work correctly on preview for getting the size of
 473          *   the current page.
 474          * @FIXME Title::getLength() documentation claims that it adds things to
 475          *   the link cache, so the local cache here should be unnecessary, but in
 476          *   fact calling getLength() repeatedly for the same $page does seem to
 477          *   run one query for each call?
 478          */
 479         static function pagesize( $parser, $page = '', $raw = null ) {
 480                 static $cache = array();
 481                 $title = Title::newFromText($page);
 482
 483                 if( !is_object( $title ) ) {
 484                         $cache[$page] = 0;
 485                         return self::formatRaw( 0, $raw );
 486                 }
 487
 488                 # Normalize name for cache
 489                 $page = $title->getPrefixedText();
 490
 491                 $length = 0;
 492                 if( isset( $cache[$page] ) ) {
 493                         $length = $cache[$page];
 494                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 495                         $rev = Revision::newFromTitle($title);
 496                         $id = $rev ? $rev->getPage() : 0;
 497                         $length = $cache[$page] = $rev ? $rev->getSize() : 0;
 498
 499                         // Register dependency in templatelinks
 500                         $parser->mOutput->addTemplate( $title, $id, $rev ? $rev->getId() : 0 );
 501                 }
 502                 return self::formatRaw( $length, $raw );
 503         }
 504
 505         /**
 506         * Returns the requested protection level for the current page
 507         */
 508         static function protectionlevel( $parser, $type = '' ) {
 509                 $restrictions = $parser->mTitle->getRestrictions( strtolower( $type ) );
 510                 # Title::getRestrictions returns an array, its possible it may have
 511                 # multiple values in the future
 512                 return implode( $restrictions, ',' );
 513         }
 514
 515         static function language( $parser, $arg = '' ) {
 516                 global $wgContLang;
 517                 $lang = $wgContLang->getLanguageName( strtolower( $arg ) );
 518                 return $lang != '' ? $lang : $arg;
 519         }
 520
 521         /**
 522          * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
 523          */
 524         static function pad( $string, $length, $padding = '0', $direction = STR_PAD_RIGHT ) {
 525                 $lengthOfPadding = mb_strlen( $padding );
 526                 if ( $lengthOfPadding == 0 ) return $string;
 527
 528                 # The remaining length to add counts down to 0 as padding is added
 529                 $length = min( $length, 500 ) - mb_strlen( $string );
 530                 # $finalPadding is just $padding repeated enough times so that
 531                 # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
 532                 $finalPadding = '';
 533                 while ( $length > 0 ) {
 534                         # If $length < $lengthofPadding, truncate $padding so we get the
 535                         # exact length desired.
 536                         $finalPadding .= mb_substr( $padding, 0, $length );
 537                         $length -= $lengthOfPadding;
 538                 }
 539
 540                 if ( $direction == STR_PAD_LEFT ) {
 541                         return $finalPadding . $string;
 542                 } else {
 543                         return $string . $finalPadding;
 544                 }
 545         }
 546
 547         static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
 548                 return self::pad( $string, $length, $padding, STR_PAD_LEFT );
 549         }
 550
 551         static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
 552                 return self::pad( $string, $length, $padding );
 553         }
 554
 555         static function anchorencode( $parser, $text ) {
 556                 $a = urlencode( $text );
 557                 $a = strtr( $a, array( '%' => '.', '+' => '_' ) );
 558                 # leave colons alone, however
 559                 $a = str_replace( '.3A', ':', $a );
 560                 return $a;
 561         }
 562
 563         static function special( $parser, $text ) {
 564                 $title = SpecialPage::getTitleForAlias( $text );
 565                 if ( $title ) {
 566                         return $title->getPrefixedText();
 567                 } else {
 568                         return wfMsgForContent( 'nosuchspecialpage' );
 569                 }
 570         }
 571
 572         public static function defaultsort( $parser, $text ) {
 573                 $text = trim( $text );
 574                 if( strlen( $text ) == 0 )
 575                         return '';
 576                 $old = $parser->getCustomDefaultSort();
 577                 $parser->setDefaultSort( $text );
 578                 if( $old === false || $old == $text )
 579                         return '';
 580                 else
 581                         return( '<span class="error">' .
 582                                 wfMsg( 'duplicate-defaultsort',
 583                                                  htmlspecialchars( $old ),
 584                                                  htmlspecialchars( $text ) ) .
 585                                 '</span>' );
 586         }
 587
 588         public static function filepath( $parser, $name='', $option='' ) {
 589                 $file = wfFindFile( $name );
 590                 if( $file ) {
 591                         $url = $file->getFullUrl();
 592                         if( $option == 'nowiki' ) {
 593                                 return array( $url, 'nowiki' => true );
 594                         }
 595                         return $url;
 596                 } else {
 597                         return '';
 598                 }
 599         }
 600
 601         /**
 602          * Parser function to extension tag adaptor
 603          */
 604         public static function tagObj( $parser, $frame, $args ) {
 605                 $xpath = false;
 606                 if ( !count( $args ) ) {
 607                         return '';
 608                 }
 609                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 610
 611                 if ( count( $args ) ) {
 612                         $inner = $frame->expand( array_shift( $args ) );
 613                 } else {
 614                         $inner = null;
 615                 }
 616
 617                 $stripList = $parser->getStripList();
 618                 if ( !in_array( $tagName, $stripList ) ) {
 619                         return '<span class="error">' .
 620                                 wfMsg( 'unknown_extension_tag', $tagName ) .
 621                                 '</span>';
 622                 }
 623
 624                 $attributes = array();
 625                 foreach ( $args as $arg ) {
 626                         $bits = $arg->splitArg();
 627                         if ( strval( $bits['index'] ) === '' ) {
 628                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 629                                 $value = trim( $frame->expand( $bits['value'] ) );
 630                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 631                                         $value = isset( $m[1] ) ? $m[1] : '';
 632                                 }
 633                                 $attributes[$name] = $value;
 634                         }
 635                 }
 636
 637                 $params = array(
 638                         'name' => $tagName,
 639                         'inner' => $inner,
 640                         'attributes' => $attributes,
 641                         'close' => "</$tagName>",
 642                 );
 643                 return $parser->extensionSubstitution( $params, $frame );
 644         }
 645 }