<?php

/**
 * Various core parser functions, registered in Parser::firstCallInit()
 * @addtogroup Parser
 */
class CoreParserFunctions {
	static function intFunction( $parser, $part1 = '' /*, ... */ ) {
		if ( strval( $part1 ) !== '' ) {
			$args = array_slice( func_get_args(), 2 );
			return wfMsgReal( $part1, $args, true );
		} else {
			return array( 'found' => false );
		}
	}

	static function ns( $parser, $part1 = '' ) {
		global $wgContLang;
		$found = false;
		if ( intval( $part1 ) || $part1 == "0" ) {
			$text = $wgContLang->getNsText( intval( $part1 ) );
			$found = true;
		} else {
			$param = str_replace( ' ', '_', strtolower( $part1 ) );
			$index = Namespace::getCanonicalIndex( strtolower( $param ) );
			if ( !is_null( $index ) ) {
				$text = $wgContLang->getNsText( $index );
				$found = true;
			}
		}
		if ( $found ) {
			return $text;
		} else {
			return array( 'found' => false );
		}
	}

	static function urlencode( $parser, $s = '' ) {
		return urlencode( $s );
	}

	static function lcfirst( $parser, $s = '' ) {
		global $wgContLang;
		return $wgContLang->lcfirst( $s );
	}

	static function ucfirst( $parser, $s = '' ) {
		global $wgContLang;
		return $wgContLang->ucfirst( $s );
	}

	static function lc( $parser, $s = '' ) {
		global $wgContLang;
		if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
			return $parser->markerSkipCallback( $s, array( $wgContLang, 'lc' ) );
		} else {
			return $wgContLang->lc( $s );
		}
	}

	static function uc( $parser, $s = '' ) {
		global $wgContLang;
		if ( is_callable( array( $parser, 'markerSkipCallback' ) ) ) {
			return $parser->markerSkipCallback( $s, array( $wgContLang, 'uc' ) );
		} else {
			return $wgContLang->uc( $s );
		}
	}

	static function localurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getLocalURL', $s, $arg ); }
	static function localurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeLocalURL', $s, $arg ); }
	static function fullurl( $parser, $s = '', $arg = null ) { return self::urlFunction( 'getFullURL', $s, $arg ); }
	static function fullurle( $parser, $s = '', $arg = null ) { return self::urlFunction( 'escapeFullURL', $s, $arg ); }

	static function urlFunction( $func, $s = '', $arg = null ) {
		$title = Title::newFromText( $s );
		# Due to order of execution of a lot of bits, the values might be encoded
		# before arriving here; if that's true, then the title can't be created
		# and the variable will fail. If we can't get a decent title from the first
		# attempt, url-decode and try for a second.
		if( is_null( $title ) )
			$title = Title::newFromUrl( urldecode( $s ) );
		if ( !is_null( $title ) ) {
			if ( !is_null( $arg ) ) {
				$text = $title->$func( $arg );
			} else {
				$text = $title->$func();
			}
			return $text;
		} else {
			return array( 'found' => false );
		}
	}

	static function formatNum( $parser, $num = '' ) {
		return $parser->getFunctionLang()->formatNum( $num );
	}

	static function grammar( $parser, $case = '', $word = '' ) {
		return $parser->getFunctionLang()->convertGrammar( $word, $case );
	}

	static function plural( $parser, $text = '') {
		$forms = array_slice( func_get_args(), 2);
		$text = $parser->getFunctionLang()->parseFormattedNumber( $text );
		return $parser->getFunctionLang()->convertPlural( $text, $forms );
	}

	/**
	 * Override the title of the page when viewed,
	 * provided we've been given a title which
	 * will normalise to the canonical title
	 *
	 * @param Parser $parser Parent parser
	 * @param string $text Desired title text
	 * @return string
	 */
	static function displaytitle( $parser, $text = '' ) {
		$text = trim( Sanitizer::decodeCharReferences( $text ) );
		$title = Title::newFromText( $text );
		if( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) )
			$parser->mOutput->setDisplayTitle( $text );
		return '';
	}

	static function isRaw( $param ) {
		static $mwRaw;
		if ( !$mwRaw ) {
			$mwRaw =& MagicWord::get( 'rawsuffix' );
		}
		if ( is_null( $param ) ) {
			return false;
		} else {
			return $mwRaw->match( $param );
		}
	}

	static function statisticsFunction( $func, $raw = null ) {
		if ( self::isRaw( $raw ) ) {
			return call_user_func( array( 'SiteStats', $func ) );
		} else {
			global $wgContLang;
			return $wgContLang->formatNum( call_user_func( array( 'SiteStats', $func ) ) );
		}
	}

	static function numberofpages( $parser, $raw = null ) { return self::statisticsFunction( 'pages', $raw ); }
	static function numberofusers( $parser, $raw = null ) { return self::statisticsFunction( 'users', $raw ); }
	static function numberofarticles( $parser, $raw = null ) { return self::statisticsFunction( 'articles', $raw ); }
	static function numberoffiles( $parser, $raw = null ) { return self::statisticsFunction( 'images', $raw ); }
	static function numberofadmins( $parser, $raw = null ) { return self::statisticsFunction( 'admins', $raw ); }
	static function numberofedits( $parser, $raw = null ) { return self::statisticsFunction( 'edits', $raw ); }

	static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
		$count = SiteStats::pagesInNs( intval( $namespace ) );
		if ( self::isRaw( $raw ) ) {
			global $wgContLang;
			return $wgContLang->formatNum( $count );
		} else {
			return $count;
		}
	}

	static function language( $parser, $arg = '' ) {
		global $wgContLang;
		$lang = $wgContLang->getLanguageName( strtolower( $arg ) );
		return $lang != '' ? $lang : $arg;
	}

	static function pad( $string = '', $length = 0, $char = 0, $direction = STR_PAD_RIGHT ) {
		$length = min( max( $length, 0 ), 500 );
		$char = substr( $char, 0, 1 );
		return ( $string !== '' && (int)$length > 0 && strlen( trim( (string)$char ) ) > 0 )
				? str_pad( $string, $length, (string)$char, $direction )
				: $string;
	}

	static function padleft( $parser, $string = '', $length = 0, $char = 0 ) {
		return self::pad( $string, $length, $char, STR_PAD_LEFT );
	}

	static function padright( $parser, $string = '', $length = 0, $char = 0 ) {
		return self::pad( $string, $length, $char );
	}

	static function anchorencode( $parser, $text ) {
		$a = urlencode( $text );
		$a = strtr( $a, array( '%' => '.', '+' => '_' ) );
		# leave colons alone, however
		$a = str_replace( '.3A', ':', $a );
		return $a;
	}

	static function special( $parser, $text ) {
		$title = SpecialPage::getTitleForAlias( $text );
		if ( $title ) {
			return $title->getPrefixedText();
		} else {
			return wfMsgForContent( 'nosuchspecialpage' );
		}
	}
	
	public static function defaultsort( $parser, $text ) {
		$text = trim( $text );
		if( strlen( $text ) > 0 )
			$parser->setDefaultSort( $text );
		return '';
	}
	
	public static function filepath( $parser, $name='', $option='' ) {
		$file = wfFindFile( $name );
		if( $file ) {
			$url = $file->getFullUrl();
			if( $option == 'nowiki' ) {
				return "<nowiki>$url</nowiki>";
			}
			return $url;
		} else {
			return '';
		}
	}

	/**
	 * Parser function to extension tag adaptor
	 */
	public static function tagObj( $parser, $frame, $args ) {
		$xpath = false;
		if ( !count( $args ) ) {
			return '';
		}
		$tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );

		if ( count( $args ) ) {
			$inner = $frame->expand( array_shift( $args ) );
		} else {
			$inner = null;
		}

		$stripList = $parser->getStripList();
		if ( !in_array( $tagName, $stripList ) ) {
			return '<span class="error">' . 
				wfMsg( 'unknown_extension_tag', $tagName ) . 
				'</span>';
		}

		$attributes = array();
		foreach ( $args as $arg ) {
			$bits = $arg->splitArg();
			if ( strval( $bits['index'] ) === '' ) {
				$name = $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS );
				$value = trim( $frame->expand( $bits['value'] ) );
				if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
					$value = isset( $m[1] ) ? $m[1] : '';
				}
				$attributes[$name] = $value;
			}
		}

		$params = array(
			'name' => $tagName,
			'inner' => $inner,
			'attributes' => $attributes,
			'close' => "</$tagName>",
		);
		return $parser->extensionSubstitution( $params, $frame );
	}
}