Parser Combinator Examples

SequenceParser.cpp

template<typename ...Parsers>
struct Seq {
	
	using is_parser_type = std::true_type;
	using return_type = typename std::tuple<typename Parsers::return_type...>;
	using container_type = typename std::tuple<Parsers...>;

	
	container_type const parsers;

	explicit constexpr Seq(Parsers const& ...p) :parsers(p...) {};

	template<typename Iterator>
	bool operator()(Iterator& it, Iterator end, return_type* result) const{

		return_type tmp;
		Iterator backtrack = it;
		bool res = std::apply(all_applicator_res<Iterator, return_type, Parsers...>, parsers)(it, end, tmp);
		
		if (res) {
			*result = tmp;
		}
		else {
			it = backtrack;
		}
		return res;
	}
};