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#ifndef RFL_PARSING_TUPLEPARSER_HPP_
#define RFL_PARSING_TUPLEPARSER_HPP_
#include <cstddef>
#include <map>
#include <type_traits>
#include <utility>
#include "../Result.hpp"
#include "../Tuple.hpp"
#include "../always_false.hpp"
#include "../internal/nth_element_t.hpp"
#include "../internal/ptr_cast.hpp"
#include "Parent.hpp"
#include "TupleReader.hpp"
#include "call_destructors_on_tuple_where_necessary.hpp"
#include "schema/Type.hpp"
#include "schemaful/IsSchemafulReader.hpp"
#include "schemaful/IsSchemafulWriter.hpp"
#include "schemaful/tuple_to_named_tuple.hpp"
#include "schemaful/tuple_to_named_tuple_t.hpp"
namespace rfl::parsing {
template <class R, class W, bool _ignore_empty_containers, bool _all_required,
class ProcessorsType, class TupleType>
requires AreReaderAndWriter<R, W, TupleType>
struct TupleParser {
public:
using InputArrayType = typename R::InputArrayType;
using InputVarType = typename R::InputVarType;
using ParentType = Parent<W>;
static Result<TupleType> read(const R& _r,
const InputVarType& _var) noexcept {
if constexpr (schemaful::IsSchemafulReader<R>) {
using NamedTupleType = schemaful::tuple_to_named_tuple_t<TupleType>;
const auto to_tuple = [](auto&& _named_tuple) {
return [&]<int... _is>(std::integer_sequence<int, _is...>) {
return TupleType(std::move(rfl::get<_is>(_named_tuple))...);
}(std::make_integer_sequence<int, NamedTupleType::size()>());
};
return Parser<R, W, NamedTupleType, ProcessorsType>::read(_r, _var)
.transform(to_tuple);
} else {
const auto parse = [&](const InputArrayType& _arr) -> Result<TupleType> {
alignas(TupleType) unsigned char buf[sizeof(TupleType)]{};
auto ptr = internal::ptr_cast<TupleType*>(&buf);
const auto tuple_reader =
TupleReader<R, W, TupleType, _ignore_empty_containers,
_all_required, ProcessorsType>(&_r, ptr);
auto err = _r.read_array(tuple_reader, _arr);
if (err) {
call_destructors_on_tuple_where_necessary(tuple_reader.num_set(),
ptr);
return error(*err);
}
err = tuple_reader.handle_missing_fields();
if (err) {
call_destructors_on_tuple_where_necessary(tuple_reader.num_set(),
ptr);
return error(*err);
}
auto res = Result<TupleType>(std::move(*ptr));
call_destructors_on_tuple_where_necessary(tuple_reader.num_set(), ptr);
return res;
};
return _r.to_array(_var).and_then(parse);
}
}
template <class P>
static void write(const W& _w, const TupleType& _tup,
const P& _parent) noexcept {
if constexpr (schemaful::IsSchemafulWriter<W>) {
const auto named_tuple = schemaful::tuple_to_named_tuple(_tup);
Parser<R, W, std::remove_cvref_t<decltype(named_tuple)>,
ProcessorsType>::write(_w, named_tuple, _parent);
} else {
constexpr auto size = rfl::tuple_size_v<TupleType>;
auto arr = ParentType::add_array(_w, size, _parent);
const auto new_parent = typename ParentType::Array{&arr};
to_array(_w, _tup, new_parent, std::make_integer_sequence<int, size>());
_w.end_array(&arr);
}
}
static schema::Type to_schema(
std::map<std::string, schema::Type>* _definitions) {
std::vector<schema::Type> types;
build_schema(
_definitions, &types,
std::make_integer_sequence<int, rfl::tuple_size_v<TupleType>>());
return schema::Type{schema::Type::Tuple{.types_ = std::move(types)}};
}
private:
template <size_t _i>
static void add_to_schema(std::map<std::string, schema::Type>* _definitions,
std::vector<schema::Type>* _types) noexcept {
using U = std::remove_cvref_t<rfl::tuple_element_t<_i, TupleType>>;
_types->push_back(Parser<R, W, U, ProcessorsType>::to_schema(_definitions));
}
template <int... _is>
static void build_schema(std::map<std::string, schema::Type>* _definitions,
std::vector<schema::Type>* _types,
std::integer_sequence<int, _is...>) noexcept {
(add_to_schema<_is>(_definitions, _types), ...);
}
template <int _i, class P>
static void add_to_array(const W& _w, const TupleType& _tup,
const P& _parent) noexcept {
using NewFieldType =
std::remove_cvref_t<rfl::tuple_element_t<_i, TupleType>>;
Parser<R, W, NewFieldType, ProcessorsType>::write(_w, rfl::get<_i>(_tup),
_parent);
}
template <int... _is, class P>
static void to_array(const W& _w, const TupleType& _tup, const P& _parent,
std::integer_sequence<int, _is...>) noexcept {
(add_to_array<_is>(_w, _tup, _parent), ...);
}
};
} // namespace rfl::parsing
#endif
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