C++ (Cpp) Error::error Examples

Example #1

File: lexer.cpp Project: sasaki-seiji/ProgrammingLanguageCPP4th

Lexer::Token Lexer::Token_stream::get()
{
	char ch;

	do {
		if (!ip->get(ch)) return ct={Kind::end};
	} while (ch != '\n' && isspace(ch));

	switch (ch){
	case ';':
	case '\n':
		return ct={Kind::print};
	case '*':
	case '/':
	case '+':
	case '-':
	case '(':
	case ')':
	case '=':
		return ct={static_cast<Kind>(ch)};
	case '0': case '1': case '2': case '3': case '4':
	case '5': case '6': case '7': case '8': case '9':
	case '.':
		ip->putback(ch);
		*ip >> ct.number_value;
		ct.kind = Kind::number;
		return ct;
	default:
		if (isalpha(ch)){
			ct.string_value = ch;
			while (ip->get(ch))
				if (isalnum(ch))
					ct.string_value += ch;
				else {
					ip->putback(ch);
					break;
				}
			ct.kind = {Kind::name};
			return ct;
		}

		error("bad token");
		return ct={Kind::print};
	}
}