static public function parseString( $string ){
		if( substr_count( $string, "{" ) !== substr_count( $string, "}" ) )							//  
			throw Exception( 'Invalid paranthesis' );
		$string	= preg_replace( '/\/\*.+\*\//sU', '', $string );
		$string	= preg_replace( '/(\t|\r|\n)/s', '', $string );
		$state	= (int) ( $buffer = $key = '' );
		$sheet	= new ADT_CSS_Sheet();
		for( $i=0; $i<strlen( $string ); $i++ ){
			$char = $string[$i];
			if( !$state && $char == '{' ){
				$state	= (boolean) ( $key = trim( $buffer ) );
				$buffer	= '';
			}
			else if( $state && $char == '}' ){
				$properties	= self::parseProperties( $buffer );
				foreach( explode( ',', $key ) as $selector )
					$sheet->addRule( new ADT_CSS_Rule( $selector, $properties ) );
				$state	= (boolean) ($buffer = '');
			}
			else
				$buffer	.= $char;
		}
		return $sheet;
	}