65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
#ifndef RFL_PARSING_PARSER_OPTIONAL_HPP_
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#define RFL_PARSING_PARSER_OPTIONAL_HPP_
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#include <map>
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#include <optional>
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#include <type_traits>
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#include "../Ref.hpp"
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#include "../Result.hpp"
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#include "../always_false.hpp"
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#include "Parent.hpp"
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#include "Parser_base.hpp"
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#include "schema/Type.hpp"
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namespace rfl {
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namespace parsing {
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template <class R, class W, class T, class ProcessorsType>
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requires AreReaderAndWriter<R, W, std::optional<T>>
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struct Parser<R, W, std::optional<T>, ProcessorsType> {
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using InputVarType = typename R::InputVarType;
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using OutputVarType = typename W::OutputVarType;
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using ParentType = Parent<W>;
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static Result<std::optional<T>>
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read(const R& _r, const InputVarType& _var) noexcept {
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if (_r.is_empty(_var)) { return std::optional<T>(); }
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const auto to_opt = [](auto&& _t) { return std::make_optional<T>(_t); };
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return Parser<R, W, std::remove_cvref_t<T>, ProcessorsType>::read(
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_r, _var
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)
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.transform(to_opt);
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}
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template <class P>
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static void write(
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const W& _w,
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const std::optional<T>& _o,
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const P& _parent
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) noexcept {
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if (!_o) {
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ParentType::add_null(_w, _parent);
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return;
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}
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Parser<R, W, std::remove_cvref_t<T>, ProcessorsType>::write(
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_w, *_o, _parent
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);
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}
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static schema::Type to_schema(
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std::map<std::string, schema::Type>* _definitions
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) {
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using U = std::remove_cvref_t<T>;
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return schema::Type {schema::Type::Optional {Ref<schema::Type>::make(
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Parser<R, W, U, ProcessorsType>::to_schema(_definitions)
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)}};
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}
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};
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} // namespace parsing
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} // namespace rfl
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#endif
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