static function parse_file( $f ){
		$src = file_get_contents( $f, true );
		if( $src === false ){
			throw new Exception("Cannot read file $f");
		}
		return self::parse_string( $src );
	}
static function parse_file( $f ){
		$src = file_get_contents( $f, true );
		if( $src === false ){
			throw new Exception("Cannot read file $f");
		}
		return self::parse_string( $src );
	}
static function parse_file ( $ f ) { $ src = file_get_contents ( $ f , true ) ; if ( $ src === false ) { throw new Exception ( "Cannot read file $f" ) ; } return self :: parse_string ( $ src ) ; }
Parse input from file
@param string file path
@return ParseNode
Parse input from file