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