use io;
use fmt;

export type invalid = !(uint, uint);
export type error = !(invalid | io::error);

export type punctuation = enum uint {
	LEFT_PAREN, RIGHT_PAREN,
	LEFT_SQUARE_BRACKET, RIGHT_SQUARE_BRACKET,
	LEFT_CURLY_BRACKET, RIGHT_CURLY_BRACKET,
	BACKSLASH, COLON,
};
export type word = struct { v: str };
export type token = (punctuation | word | str);

export fn strerror(err: error) const str = {
	static let buf: [64]u8 = [0...];
	match (err) {
	case let err: invalid =>
		return fmt::bsprintf(buf,
			"{}:{}: Invalid token found", err.0, err.1);
	case let err: io::error =>
		return io::strerror(err);
	};
};