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( 'plural',           array( __CLASS__, 'plural'           ), SFH_NO_HASH );
  31                 $parser->setFunctionHook( 'numberofpages',    array( __CLASS__, 'numberofpages'    ), SFH_NO_HASH );
  32                 $parser->setFunctionHook( 'numberofusers',    array( __CLASS__, 'numberofusers'    ), SFH_NO_HASH );
  33                 $parser->setFunctionHook( 'numberofarticles', array( __CLASS__, 'numberofarticles' ), SFH_NO_HASH );
  34                 $parser->setFunctionHook( 'numberoffiles',    array( __CLASS__, 'numberoffiles'    ), SFH_NO_HASH );
  35                 $parser->setFunctionHook( 'numberofadmins',   array( __CLASS__, 'numberofadmins'   ), SFH_NO_HASH );
  36                 $parser->setFunctionHook( 'numberingroup',    array( __CLASS__, 'numberingroup'    ), SFH_NO_HASH );
  37                 $parser->setFunctionHook( 'numberofedits',    array( __CLASS__, 'numberofedits'    ), SFH_NO_HASH );
  38                 $parser->setFunctionHook( 'numberofviews',    array( __CLASS__, 'numberofviews'    ), SFH_NO_HASH );
  39                 $parser->setFunctionHook( 'language',         array( __CLASS__, 'language'         ), SFH_NO_HASH );
  40                 $parser->setFunctionHook( 'padleft',          array( __CLASS__, 'padleft'          ), SFH_NO_HASH );
  41                 $parser->setFunctionHook( 'padright',         array( __CLASS__, 'padright'         ), SFH_NO_HASH );
  42                 $parser->setFunctionHook( 'anchorencode',     array( __CLASS__, 'anchorencode'     ), SFH_NO_HASH );
  43                 $parser->setFunctionHook( 'special',          array( __CLASS__, 'special'          ) );
  44                 $parser->setFunctionHook( 'defaultsort',      array( __CLASS__, 'defaultsort'      ), SFH_NO_HASH );
  45                 $parser->setFunctionHook( 'filepath',         array( __CLASS__, 'filepath'         ), SFH_NO_HASH );
  46                 $parser->setFunctionHook( 'pagesincategory',  array( __CLASS__, 'pagesincategory'  ), SFH_NO_HASH );
  47                 $parser->setFunctionHook( 'pagesize',         array( __CLASS__, 'pagesize'         ), SFH_NO_HASH );
  48                 $parser->setFunctionHook( 'tag',              array( __CLASS__, 'tagObj'           ), SFH_OBJECT_ARGS );
  49
  50                 if ( $wgAllowDisplayTitle ) {
  51                         $parser->setFunctionHook( 'displaytitle', array( __CLASS__, 'displaytitle' ), SFH_NO_HASH );
  52                 }
  53                 if ( $wgAllowSlowParserFunctions ) {
  54                         $parser->setFunctionHook( 'pagesinnamespace', array( __CLASS__, 'pagesinnamespace' ), SFH_NO_HASH );
  55                 }
  56         }
  57
  58         static function intFunction( $parser, $part1 = '' /*, ... */ ) {
  59                 if ( strval( $part1 ) !== '' ) {
  60                         $args = array_slice( func_get_args(), 2 );
  61                         $message = wfMsgGetKey( $part1, true, false, false );
  62                         $message = wfMsgReplaceArgs( $message, $args );
  63                         $message = $parser->replaceVariables( $message ); // like $wgMessageCache->transform()
  64                         return $message;
  65                 } else {
  66                         return array( 'found' => false );
  67                 }
  68         }
  69
  70         static function ns( $parser, $part1 = '' ) {
  71                 global $wgContLang;
  72                 if ( intval( $part1 ) || $part1 == "0" ) {
  73                         $index = intval( $part1 );
  74                 } else {
  75                         $index = $wgContLang->getNsIndex( str_replace( ' ', '_', $part1 ) );
  76                 }
  77                 if ( $index !== false ) {
  78                         return $wgContLang->getFormattedNsText( $index );
  79                 } else {
  80                         return array( 'found' => false );
  81                 }
  82         }
  83
  84         static function urlencode( $parser, $s = '' ) {
  85                 return urlencode( $s );
  86         }
  87
  88         static function lcfirst( $parser, $s = '' ) {
  89                 global $wgContLang;
  90                 return $wgContLang->lcfirst( $s );
  91         }
  92
  93         static function ucfirst( $parser, $s = '' ) {
  94                 global $wgContLang;
  95                 return $wgContLang->ucfirst( $s );
  96         }
  97
  98         static function lc( $parser, $s = '' ) {
  99                 global $wgContLang;
 100                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 101                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
 102                 } else {
 103                         return $wgContLang->lc( $s );
 104                 }
 105         }
 106
 107         static function uc( $parser, $s = '' ) {
 108                 global $wgContLang;
 109                 if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
 110                         return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
 111                 } else {
 112                         return $wgContLang->uc( $s );
 113                 }
 114         }
 115
 116         static function localurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getLocalURL', $s, $arg ); }
 117         static function localurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeLocalURL', $s, $arg ); }
 118         static function fullurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getFullURL', $s, $arg ); }
 119         static function fullurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeFullURL', $s, $arg ); }
 120
 121         static function urlFunction( $func, $s = '', $arg = null ) {
 122                 $title = Title::newFromText( $s );
 123                 # Due to order of execution of a lot of bits, the values might be encoded
 124                 # before arriving here; if that's true, then the title can't be created
 125                 # and the variable will fail. If we can't get a decent title from the first
 126                 # attempt, url-decode and try for a second.
 127                 if( is_null( $title ) )
 128                         $title = Title::newFromUrl( urldecode( $s ) );
 129                 if ( !is_null( $title ) ) {
 130                         if ( !is_null( $arg ) ) {
 131                                 $text = $title->$func( $arg );
 132                         } else {
 133                                 $text = $title->$func();
 134                         }
 135                         return $text;
 136                 } else {
 137                         return array( 'found' => false );
 138                 }
 139         }
 140
 141         static function formatNum( $parser, $num = '', $raw = null) {
 142                 if ( self::israw( $raw ) ) {
 143                         return $parser->getFunctionLang()->parseFormattedNumber( $num );
 144                 } else {
 145                         return $parser->getFunctionLang()->formatNum( $num );
 146                 }
 147         }
 148
 149         static function grammar( $parser, $case = '', $word = '' ) {
 150                 return $parser->getFunctionLang()->convertGrammar( $word, $case );
 151         }
 152
 153         static function plural( $parser, $text = '') {
 154                 $forms = array_slice( func_get_args(), 2);
 155                 $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
 156                 return $parser->getFunctionLang()->convertPlural( $text, $forms );
 157         }
 158
 159         /**
 160          * Override the title of the page when viewed, provided we've been given a
 161          * title which will normalise to the canonical title
 162          *
 163          * @param Parser $parser Parent parser
 164          * @param string $text Desired title text
 165          * @return string
 166          */
 167         static function displaytitle( $parser, $text = '' ) {
 168                 global $wgRestrictDisplayTitle;
 169                 $text = trim( Sanitizer::decodeCharReferences( $text ) );
 170
 171                 if ( !$wgRestrictDisplayTitle ) {
 172                         $parser->mOutput->setDisplayTitle( $text );
 173                 } else {
 174                         $title = Title::newFromText( $text );
 175                         if( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) )
 176                                 $parser->mOutput->setDisplayTitle( $text );
 177                 }
 178                 return '';
 179         }
 180
 181         static function isRaw( $param ) {
 182                 static $mwRaw;
 183                 if ( !$mwRaw ) {
 184                         $mwRaw =& MagicWord::get( 'rawsuffix' );
 185                 }
 186                 if ( is_null( $param ) ) {
 187                         return false;
 188                 } else {
 189                         return $mwRaw->match( $param );
 190                 }
 191         }
 192
 193         static function formatRaw( $num, $raw ) {
 194                 if( self::isRaw( $raw ) ) {
 195                         return $num;
 196                 } else {
 197                         global $wgContLang;
 198                         return $wgContLang->formatNum( $num );
 199                 }
 200         }
 201         static function numberofpages( $parser, $raw = null ) {
 202                 return self::formatRaw( SiteStats::pages(), $raw );
 203         }
 204         static function numberofusers( $parser, $raw = null ) {
 205                 return self::formatRaw( SiteStats::users(), $raw );
 206         }
 207         static function numberofarticles( $parser, $raw = null ) {
 208                 return self::formatRaw( SiteStats::articles(), $raw );
 209         }
 210         static function numberoffiles( $parser, $raw = null ) {
 211                 return self::formatRaw( SiteStats::images(), $raw );
 212         }
 213         static function numberofadmins( $parser, $raw = null ) {
 214                 return self::formatRaw( SiteStats::numberingroup('sysop'), $raw );
 215         }
 216         static function numberofedits( $parser, $raw = null ) {
 217                 return self::formatRaw( SiteStats::edits(), $raw );
 218         }
 219         static function numberofviews( $parser, $raw = null ) {
 220                 return self::formatRaw( SiteStats::views(), $raw );
 221         }
 222         static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
 223                 return self::formatRaw( SiteStats::pagesInNs( intval( $namespace ) ), $raw );
 224         }
 225         static function numberingroup( $parser, $name = '', $raw = null) {
 226                 return self::formatRaw( SiteStats::numberingroup( strtolower( $name ) ), $raw );
 227         }
 228
 229         /**
 230          * Return the number of pages in the given category, or 0 if it's nonexis-
 231          * tent.  This is an expensive parser function and can't be called too many
 232          * times per page.
 233          */
 234         static function pagesincategory( $parser, $name = '', $raw = null ) {
 235                 static $cache = array();
 236                 $category = Category::newFromName( $name );
 237
 238                 if( !is_object( $category ) ) {
 239                         $cache[$name] = 0;
 240                         return self::formatRaw( 0, $raw );
 241                 }
 242
 243                 # Normalize name for cache
 244                 $name = $category->getName();
 245
 246                 $count = 0;
 247                 if( isset( $cache[$name] ) ) {
 248                         $count = $cache[$name];
 249                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 250                         $count = $cache[$name] = (int)$category->getPageCount();
 251                 }
 252                 return self::formatRaw( $count, $raw );
 253         }
 254
 255         /**
 256          * Return the size of the given page, or 0 if it's nonexistent.  This is an
 257          * expensive parser function and can't be called too many times per page.
 258          *
 259          * @FIXME This doesn't work correctly on preview for getting the size of
 260          *   the current page.
 261          * @FIXME Title::getLength() documentation claims that it adds things to
 262          *   the link cache, so the local cache here should be unnecessary, but in
 263          *   fact calling getLength() repeatedly for the same $page does seem to
 264          *   run one query for each call?
 265          */
 266         static function pagesize( $parser, $page = '', $raw = null ) {
 267                 static $cache = array();
 268                 $title = Title::newFromText($page);
 269
 270                 if( !is_object( $title ) ) {
 271                         $cache[$page] = 0;
 272                         return self::formatRaw( 0, $raw );
 273                 }
 274
 275                 # Normalize name for cache
 276                 $page = $title->getPrefixedText();
 277
 278                 $length = 0;
 279                 if( isset( $cache[$page] ) ) {
 280                         $length = $cache[$page];
 281                 } elseif( $parser->incrementExpensiveFunctionCount() ) {
 282                         $length = $cache[$page] = $title->getLength();
 283
 284                         // Register dependency in templatelinks
 285                         $id = $title->getArticleId();
 286                         $rev = Revision::newFromTitle($title);
 287                         $parser->mOutput->addTemplate( $title, $id, $rev->getId() );
 288                 }
 289                 return self::formatRaw( $length, $raw );
 290         }
 291
 292         static function language( $parser, $arg = '' ) {
 293                 global $wgContLang;
 294                 $lang = $wgContLang->getLanguageName( strtolower( $arg ) );
 295                 return $lang != '' ? $lang : $arg;
 296         }
 297
 298         static function pad( $string = '', $length = 0, $char = 0, $direction = STR_PAD_RIGHT ) {
 299                 $length = min( max( $length, 0 ), 500 );
 300                 $char = substr( $char, 0, 1 );
 301                 return ( $string !== '' && (int)$length > 0 && strlen( trim( (string)$char ) ) > 0 )
 302                                 ? str_pad( $string, $length, (string)$char, $direction )
 303                                 : $string;
 304         }
 305
 306         static function padleft( $parser, $string = '', $length = 0, $char = 0 ) {
 307                 return self::pad( $string, $length, $char, STR_PAD_LEFT );
 308         }
 309
 310         static function padright( $parser, $string = '', $length = 0, $char = 0 ) {
 311                 return self::pad( $string, $length, $char );
 312         }
 313
 314         static function anchorencode( $parser, $text ) {
 315                 $a = urlencode( $text );
 316                 $a = strtr( $a, array( '%' => '.', '+' => '_' ) );
 317                 # leave colons alone, however
 318                 $a = str_replace( '.3A', ':', $a );
 319                 return $a;
 320         }
 321
 322         static function special( $parser, $text ) {
 323                 $title = SpecialPage::getTitleForAlias( $text );
 324                 if ( $title ) {
 325                         return $title->getPrefixedText();
 326                 } else {
 327                         return wfMsgForContent( 'nosuchspecialpage' );
 328                 }
 329         }
 330
 331         public static function defaultsort( $parser, $text ) {
 332                 $text = trim( $text );
 333                 if( strlen( $text ) == 0 )
 334                         return '';
 335                 $old = $parser->getCustomDefaultSort();
 336                 $parser->setDefaultSort( $text );
 337                 if( $old === false || $old == $text )
 338                         return '';
 339                 else
 340                         return( '<span class="error">' .
 341                                 wfMsg( 'duplicate-defaultsort',
 342                                                  htmlspecialchars( $old ),
 343                                                  htmlspecialchars( $text ) ) .
 344                                 '</span>' );
 345         }
 346
 347         public static function filepath( $parser, $name='', $option='' ) {
 348                 $file = wfFindFile( $name );
 349                 if( $file ) {
 350                         $url = $file->getFullUrl();
 351                         if( $option == 'nowiki' ) {
 352                                 return "<nowiki>$url</nowiki>";
 353                         }
 354                         return $url;
 355                 } else {
 356                         return '';
 357                 }
 358         }
 359
 360         /**
 361          * Parser function to extension tag adaptor
 362          */
 363         public static function tagObj( $parser, $frame, $args ) {
 364                 $xpath = false;
 365                 if ( !count( $args ) ) {
 366                         return '';
 367                 }
 368                 $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );
 369
 370                 if ( count( $args ) ) {
 371                         $inner = $frame->expand( array_shift( $args ) );
 372                 } else {
 373                         $inner = null;
 374                 }
 375
 376                 $stripList = $parser->getStripList();
 377                 if ( !in_array( $tagName, $stripList ) ) {
 378                         return '<span class="error">' .
 379                                 wfMsg( 'unknown_extension_tag', $tagName ) .
 380                                 '</span>';
 381                 }
 382
 383                 $attributes = array();
 384                 foreach ( $args as $arg ) {
 385                         $bits = $arg->splitArg();
 386                         if ( strval( $bits['index'] ) === '' ) {
 387                                 $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 388                                 $value = trim( $frame->expand( $bits['value'] ) );
 389                                 if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
 390                                         $value = isset( $m[1] ) ? $m[1] : '';
 391                                 }
 392                                 $attributes[$name] = $value;
 393                         }
 394                 }
 395
 396                 $params = array(
 397                         'name' => $tagName,
 398                         'inner' => $inner,
 399                         'attributes' => $attributes,
 400                         'close' => "</$tagName>",
 401                 );
 402                 return $parser->extensionSubstitution( $params, $frame );
 403         }
 404 }