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#ifndef RFL_MSGPACK_READER_HPP_
#define RFL_MSGPACK_READER_HPP_
#include <msgpack.h>
#include <cstddef>
#include <exception>
#include <string>
#include <string_view>
#include <type_traits>
#include "../Bytestring.hpp"
#include "../Result.hpp"
#include "../always_false.hpp"
#include "../internal/ptr_cast.hpp"
namespace rfl {
namespace msgpack {
struct Reader {
using InputArrayType = msgpack_object_array;
using InputObjectType = msgpack_object_map;
using InputVarType = msgpack_object;
template <class T>
static constexpr bool has_custom_constructor =
(requires(InputVarType var) { T::from_msgpack_obj(var); });
rfl::Result<InputVarType> get_field_from_array(
const size_t _idx, const InputArrayType _arr) const noexcept {
if (_idx >= _arr.size) {
return error("Index " + std::to_string(_idx) + " of of bounds.");
}
return _arr.ptr[_idx];
}
rfl::Result<InputVarType> get_field_from_object(
const std::string& _name, const InputObjectType& _obj) const noexcept {
for (uint32_t i = 0; i < _obj.size; ++i) {
const auto& key = _obj.ptr[i].key;
if (key.type != MSGPACK_OBJECT_STR) {
return error("Key in element " + std::to_string(i) +
" was not a string.");
}
const auto current_name =
std::string_view(key.via.str.ptr, key.via.str.size);
if (_name == current_name) {
return _obj.ptr[i].val;
}
}
return error("No field named '" + _name + "' was found.");
}
bool is_empty(const InputVarType& _var) const noexcept {
return _var.type == MSGPACK_OBJECT_NIL;
}
template <class T>
rfl::Result<T> to_basic_type(const InputVarType& _var) const noexcept {
const auto type = _var.type;
if constexpr (std::is_same<std::remove_cvref_t<T>, std::string>()) {
if (type != MSGPACK_OBJECT_STR) {
return error("Could not cast to string.");
}
const auto str = _var.via.str;
return std::string(str.ptr, str.size);
} else if constexpr (std::is_same<std::remove_cvref_t<T>,
rfl::Bytestring>()) {
if (type != MSGPACK_OBJECT_BIN) {
return error("Could not cast to a bytestring.");
}
const auto bin = _var.via.bin;
const auto data = internal::ptr_cast<const std::byte*>(bin.ptr);
return rfl::Bytestring(data, data + bin.size);
} else if constexpr (std::is_same<std::remove_cvref_t<T>, bool>()) {
if (type != MSGPACK_OBJECT_BOOLEAN) {
return error("Could not cast to boolean.");
}
return _var.via.boolean;
} else if constexpr (std::is_floating_point<std::remove_cvref_t<T>>()) {
if (type == MSGPACK_OBJECT_FLOAT32 || type == MSGPACK_OBJECT_FLOAT64 ||
type == MSGPACK_OBJECT_FLOAT) {
return static_cast<T>(_var.via.f64);
}
return error(
"Could not cast to numeric value. The type must be float "
"or double.");
} else if constexpr (std::is_integral<std::remove_cvref_t<T>>()) {
if (type == MSGPACK_OBJECT_POSITIVE_INTEGER) {
return static_cast<T>(_var.via.u64);
} else if (type == MSGPACK_OBJECT_NEGATIVE_INTEGER) {
return static_cast<T>(_var.via.i64);
}
return error(
"Could not cast to numeric value. The type must be integral, float "
"or double.");
} else {
static_assert(rfl::always_false_v<T>, "Unsupported type.");
}
}
rfl::Result<InputArrayType> to_array(
const InputVarType& _var) const noexcept {
if (_var.type != MSGPACK_OBJECT_ARRAY) {
return error("Could not cast to an array.");
}
return _var.via.array;
}
rfl::Result<InputObjectType> to_object(
const InputVarType& _var) const noexcept {
if (_var.type != MSGPACK_OBJECT_MAP) {
return error("Could not cast to a map.");
}
return _var.via.map;
}
template <class ArrayReader>
std::optional<Error> read_array(const ArrayReader& _array_reader,
const InputArrayType& _arr) const noexcept {
for (uint32_t i = 0; i < _arr.size; ++i) {
const auto err = _array_reader.read(_arr.ptr[i]);
if (err) {
return err;
}
}
return std::nullopt;
}
template <class ObjectReader>
std::optional<Error> read_object(const ObjectReader& _object_reader,
const InputObjectType& _obj) const noexcept {
for (uint32_t i = 0; i < _obj.size; ++i) {
const auto& key = _obj.ptr[i].key;
const auto& val = _obj.ptr[i].val;
if (key.type != MSGPACK_OBJECT_STR) {
return rfl::Error("Key in element " + std::to_string(i) +
" was not a string.");
}
const auto name = std::string_view(key.via.str.ptr, key.via.str.size);
_object_reader.read(name, val);
}
return std::nullopt;
}
template <class T>
rfl::Result<T> use_custom_constructor(
const InputVarType& _var) const noexcept {
try {
return T::from_msgpack_obj(_var);
} catch (std::exception& e) {
return error(e.what());
}
}
};
} // namespace msgpack
} // namespace rfl
#endif
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