100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
#ifndef RFL_PARSING_TUPLEPARSER_HPP_
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#define RFL_PARSING_TUPLEPARSER_HPP_
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#include <map>
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#include <tuple>
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#include <type_traits>
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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 "TupleReader.hpp"
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#include "schema/Type.hpp"
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namespace rfl::parsing {
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template <
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class R,
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class W,
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bool _ignore_empty_containers,
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bool _all_required,
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class ProcessorsType,
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class... Ts>
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requires AreReaderAndWriter<R, W, std::tuple<Ts...>>
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struct TupleParser {
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public:
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using InputArrayType = typename R::InputArrayType;
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using InputVarType = typename R::InputVarType;
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using OutputArrayType = typename W::OutputArrayType;
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using OutputVarType = typename W::OutputVarType;
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using ParentType = Parent<W>;
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static Result<std::tuple<Ts...>> read(const R& _r, const InputVarType& _var) noexcept {
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const auto parse = [&](const InputArrayType& _arr) -> Result<std::tuple<Ts...>> {
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alignas(std::tuple<Ts...>) unsigned char buf[sizeof(std::tuple<Ts...>)];
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auto ptr = reinterpret_cast<std::tuple<Ts...>*>(buf);
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const auto tuple_reader = TupleReader<
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R,
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W,
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std::tuple<Ts...>,
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_ignore_empty_containers,
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_all_required,
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ProcessorsType>(&_r, ptr);
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auto err = _r.read_array(tuple_reader, _arr);
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if (err) {
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tuple_reader.call_destructors_where_necessary();
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return *err;
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}
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err = tuple_reader.handle_missing_fields();
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if (err) {
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tuple_reader.call_destructors_where_necessary();
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return *err;
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}
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return std::move(*ptr);
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};
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return _r.to_array(_var).and_then(parse);
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}
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template <class P>
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static void write(const W& _w, const std::tuple<Ts...>& _tup, const P& _parent) noexcept {
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auto arr = ParentType::add_array(_w, sizeof...(Ts), _parent);
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const auto new_parent = typename ParentType::Array { &arr };
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to_array<0>(_w, _tup, new_parent);
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_w.end_array(&arr);
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}
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template <size_t _i = 0>
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static schema::Type to_schema(
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std::map<std::string, schema::Type>* _definitions,
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std::vector<schema::Type> _types = {}
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) {
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using Type = schema::Type;
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constexpr size_t size = sizeof...(Ts);
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if constexpr (_i == size) {
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return Type { Type::Tuple { .types_ = _types } };
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} else {
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using U = std::remove_cvref_t<std::tuple_element_t<_i, std::tuple<Ts...>>>;
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_types.push_back(Parser<R, W, U, ProcessorsType>::to_schema(_definitions));
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return to_schema<_i + 1>(_definitions, std::move(_types));
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}
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}
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private:
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template <int _i, class P>
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static void to_array(const W& _w, const std::tuple<Ts...>& _tup, const P& _parent) noexcept {
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if constexpr (_i < sizeof...(Ts)) {
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using NewFieldType =
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std::remove_cvref_t<typename std::tuple_element_t<_i, std::tuple<Ts...>>>;
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Parser<R, W, NewFieldType, ProcessorsType>::write(_w, std::get<_i>(_tup), _parent);
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to_array<_i + 1>(_w, _tup, _parent);
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}
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}
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};
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} // namespace rfl::parsing
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#endif
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