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