112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
#ifndef RFL_PARSING_MAPREADER_HPP_
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#define RFL_PARSING_MAPREADER_HPP_
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#include <string>
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#include <string_view>
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#include <type_traits>
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#include <utility>
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#include <vector>
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#include "../Result.hpp"
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#include "../always_false.hpp"
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namespace rfl::parsing {
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template <class R, class W, class MapType, class ProcessorsType>
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class MapReader {
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private:
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using InputVarType = typename R::InputVarType;
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using KeyType =
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std::remove_cvref_t<typename MapType::value_type::first_type>;
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using ValueType =
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std::remove_cvref_t<typename MapType::value_type::second_type>;
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public:
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MapReader(const R* _r, MapType* _map, std::vector<Error>* _errors)
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: r_(_r), map_(_map), errors_(_errors) {}
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~MapReader() = default;
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void read(const std::string_view& _name,
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const InputVarType& _var) const noexcept {
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auto res = get_pair(_name, _var);
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if (res) {
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map_->emplace(std::move(*res));
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} else {
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errors_->push_back(Error("Failed to parse field '" +
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std::string(_name) +
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"': " + res.error()->what()));
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}
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}
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private:
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template <class T>
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Result<T> key_to_numeric(auto& _pair) const noexcept {
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try {
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if constexpr (std::is_integral_v<T> && std::is_signed_v<T>) {
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return static_cast<T>(std::stoll(_pair.first));
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} else if constexpr (std::is_integral_v<T> && std::is_unsigned_v<T>) {
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return static_cast<T>(std::stoull(_pair.first));
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} else if constexpr (std::is_floating_point_v<T>) {
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return static_cast<T>(std::stod(_pair.first));
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} else {
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static_assert(always_false_v<T>, "Unsupported type");
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}
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} catch (std::exception& e) { return Error(e.what()); }
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}
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Result<std::pair<KeyType, ValueType>> make_key(auto& _pair) const noexcept {
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const auto to_pair =
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[&](auto _key) -> Result<std::pair<KeyType, ValueType>> {
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try {
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return std::make_pair(KeyType(std::move(_key)),
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std::move(_pair.second));
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} catch (std::exception& e) { return Error(e.what()); }
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};
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if constexpr (std::is_integral_v<KeyType> ||
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std::is_floating_point_v<KeyType>) {
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return key_to_numeric<KeyType>(_pair).and_then(to_pair);
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} else if constexpr (internal::has_reflection_type_v<KeyType>) {
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using ReflT = typename KeyType::ReflectionType;
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if constexpr (std::is_integral_v<ReflT> ||
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std::is_floating_point_v<ReflT>) {
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return key_to_numeric<ReflT>(_pair).and_then(to_pair);
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} else {
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return to_pair(_pair.first);
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}
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} else {
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return std::move(_pair);
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}
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}
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Result<std::pair<KeyType, ValueType>> get_pair(
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const std::string_view& _name,
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const InputVarType& _var) const noexcept {
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const auto to_pair = [&](ValueType&& _val) {
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auto pair = std::make_pair(std::string(_name), std::move(_val));
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return make_key(pair);
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};
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return Parser<R, W, std::remove_cvref_t<ValueType>, ProcessorsType>::read(
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*r_, _var)
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.and_then(to_pair);
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}
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private:
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/// The underlying reader.
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const R* r_;
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/// The underlying map.
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MapType* map_;
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/// Collects any errors we may have come across.
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std::vector<Error>* errors_;
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};
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} // namespace rfl::parsing
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#endif
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