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#ifndef RFL_UBJSON_READER_HPP_
#define RFL_UBJSON_READER_HPP_
#include <cstddef>
#include <exception>
#include <jsoncons/json.hpp>
#include <string>
#include <string_view>
#include <type_traits>
#include <vector>
#include "../Bytestring.hpp"
#include "../Result.hpp"
#include "../always_false.hpp"
#include "../internal/ptr_cast.hpp"
namespace rfl::ubjson {
class Reader {
public:
struct UBJSONInputArray {
jsoncons::json* val_;
};
struct UBJSONInputObject {
jsoncons::json* val_;
};
struct UBJSONInputVar {
jsoncons::json* val_;
};
using InputArrayType = UBJSONInputArray;
using InputObjectType = UBJSONInputObject;
using InputVarType = UBJSONInputVar;
Reader() {}
~Reader() = default;
template <class T>
static constexpr bool has_custom_constructor =
(requires(InputVarType var) { T::from_ubjson_obj(var); });
rfl::Result<InputVarType> get_field_from_array(
const size_t _idx, const InputArrayType& _arr) const noexcept {
if (_idx >= _arr.val_->size()) {
return error("Index out of range.");
}
return InputVarType{&_arr.val_->at(_idx)};
}
rfl::Result<InputVarType> get_field_from_object(
const std::string& _name, const InputObjectType& _obj) const noexcept {
for (auto& kv : _obj.val_->object_range()) {
if (kv.key() == _name) {
return InputVarType{&kv.value()};
};
}
return error("Field name '" + _name + "' not found.");
}
bool is_empty(const InputVarType& _var) const noexcept {
return _var.val_->is_null();
}
template <class T>
rfl::Result<T> to_basic_type(const InputVarType& _var) const noexcept {
if constexpr (std::is_same<std::remove_cvref_t<T>, std::string>()) {
if (!_var.val_->is_string()) {
return error("Could not cast to string.");
}
return _var.val_->as<std::string>();
} else if constexpr (std::is_same<std::remove_cvref_t<T>,
rfl::Bytestring>()) {
if (!_var.val_->is<std::vector<uint8_t>>()) {
return error("Could not cast to bytestring.");
}
const auto vec = _var.val_->as<std::vector<uint8_t>>();
const auto data = internal::ptr_cast<const std::byte*>(vec.data());
return rfl::Bytestring(data, data + vec.size());
} else if constexpr (std::is_same<std::remove_cvref_t<T>, bool>()) {
if (!_var.val_->is_bool()) {
return error("Could not cast to boolean.");
}
return _var.val_->as<bool>();
} else if constexpr (std::is_floating_point<std::remove_cvref_t<T>>()) {
if (_var.val_->is_double()) {
return static_cast<T>(_var.val_->as<double>());
}
return error("Could not cast to floating point value.");
} else if constexpr (std::is_integral<std::remove_cvref_t<T>>()) {
if (_var.val_->is_int64()) {
return static_cast<T>(_var.val_->as<int64_t>());
}
if (_var.val_->is_uint64()) {
return static_cast<T>(_var.val_->as<uint64_t>());
}
return error("Could not cast to integer.");
} else {
static_assert(rfl::always_false_v<T>, "Unsupported type.");
}
}
rfl::Result<InputArrayType> to_array(
const InputVarType& _var) const noexcept {
if (!_var.val_->is_array()) {
return error("Could not cast to an array.");
}
return InputArrayType{_var.val_};
}
rfl::Result<InputObjectType> to_object(
const InputVarType& _var) const noexcept {
if (!_var.val_->is_object()) {
return error("Could not cast to an object.");
}
return InputObjectType{_var.val_};
}
template <class ArrayReader>
std::optional<Error> read_array(const ArrayReader& _array_reader,
const InputArrayType& _arr) const noexcept {
for (auto& val : _arr.val_->array_range()) {
const auto err = _array_reader.read(InputVarType{&val});
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 (auto& kv : _obj.val_->object_range()) {
_object_reader.read(kv.key(), InputVarType{&kv.value()});
}
return std::nullopt;
}
template <class T>
rfl::Result<T> use_custom_constructor(
const InputVarType& _var) const noexcept {
try {
return T::from_ubjson_obj(_var);
} catch (std::exception& e) {
return error(e.what());
}
}
};
} // namespace rfl::ubjson
#endif
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