Function parse_short

docopt.cpp:284–346

}

static PatternList parse_short(Tokens& tokens, std::vector<Option>& options)
{
	// shorts ::= '-' ( chars )* [ [ ' ' ] chars ] ;

	auto token = tokens.pop();

	assert(starts_with(token, "-"));
	assert(!starts_with(token, "--"));

	auto i = token.begin();
	++i; // skip the leading '-'

	PatternList ret;
	while (i != token.end()) {
		std::string shortOpt = { '-', *i };
		++i;

		std::vector<Option const*> similar;
		for(auto const& option : options) {
			if (option.shortOption()==shortOpt)
				similar.push_back(&option);
		}

		if (similar.size() > 1) {
			std::string error = shortOpt + " is specified ambiguously "
			+ std::to_string(similar.size()) + " times";
			throw Tokens::OptionError(std::move(error));
		} else if (similar.empty()) {
			options.emplace_back(shortOpt, "", 0);

			auto o = std::make_shared<Option>(options.back());
			if (tokens.isParsingArgv()) {
				o->setValue(value{true});
			}
			ret.push_back(o);
		} else {
			auto o = std::make_shared<Option>(*similar[0]);
			value val;
			if (o->argCount()) {
				if (i == token.end()) {
					// consume the next token
					auto const& ttoken = tokens.current();
					if (ttoken.empty() || ttoken=="--") {
						std::string error = shortOpt + " requires an argument";
						throw Tokens::OptionError(std::move(error));
					}
					val = tokens.pop();
				} else {
					// consume all the rest
					val = std::string{i, token.end()};
					i = token.end();
				}
			}

			if (tokens.isParsingArgv()) {
				o->setValue(val ? std::move(val) : value{true});
			}
			ret.push_back(o);