draconisplusplus/include/rfl/parsing/CustomParser.hpp

#ifndef RFL_PARSING_CUSTOMPARSER_HPP_
#define RFL_PARSING_CUSTOMPARSER_HPP_

#include <exception>
#include <tuple>

#include "../internal/has_to_class_method_v.hpp"
#include "../internal/to_ptr_field_tuple.hpp"
#include "Parser.hpp"
#include "schema/Type.hpp"

namespace rfl {
  namespace parsing {

    template <class R,
              class W,
              class ProcessorsType,
              class OriginalClass,
              class HelperStruct>
    struct CustomParser {
      static Result<OriginalClass> read(const R& _r,
                                        const auto& _var) noexcept {
        const auto to_class = [](auto&& _h) -> Result<OriginalClass> {
          try {
            if constexpr (internal::has_to_class_method_v<HelperStruct>) {
              return _h.to_class();
            } else {
              auto ptr_field_tuple       = internal::to_ptr_field_tuple(_h);
              const auto class_from_ptrs = [](auto&... _ptrs) {
                return OriginalClass(std::move(*_ptrs.value_)...);
              };
              return std::apply(class_from_ptrs, ptr_field_tuple);
            }
          } catch (std::exception& e) { return Error(e.what()); }
        };
        return Parser<R, W, HelperStruct, ProcessorsType>::read(_r, _var)
            .and_then(to_class);
      }

      template <class P>
      static auto write(const W& _w,
                        const OriginalClass& _p,
                        const P& _parent) noexcept {
        Parser<R, W, HelperStruct, ProcessorsType>::write(
            _w, HelperStruct::from_class(_p), _parent);
      }

      static schema::Type to_schema(
          std::map<std::string, schema::Type>* _definitions) {
        return Parser<R, W, std::remove_cvref_t<HelperStruct>,
                      ProcessorsType>::to_schema(_definitions);
      }
    };

  } // namespace parsing
} // namespace rfl

#endif