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#ifndef RFL_TOML_READER_HPP_
#define RFL_TOML_READER_HPP_
#include <array>
#include <exception>
#include <map>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <string>
#include <string_view>
#include <toml++/toml.hpp>
#include <type_traits>
#include <unordered_map>
#include <vector>
#include "../Result.hpp"
#include "../always_false.hpp"
namespace rfl::toml {
struct Reader {
using InputArrayType = ::toml::array*;
using InputObjectType = ::toml::table*;
using InputVarType = ::toml::node*;
template <class T>
static constexpr bool has_custom_constructor =
(requires(InputVarType var) { T::from_toml_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->get(_idx);
}
rfl::Result<InputVarType> get_field_from_object(
const std::string& _name, const InputObjectType& _obj) const noexcept {
auto var = (*_obj)[_name];
if (!var) {
return error("Object contains no field named '" + _name + "'.");
}
return var.node();
}
bool is_empty(const InputVarType& _var) const noexcept {
return !_var && true;
}
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>()) {
const auto ptr = _var->as<std::string>();
if (!ptr) {
return error("Could not cast the node to std::string!");
}
return **ptr;
} else if constexpr (std::is_same<std::remove_cvref_t<T>, bool>()) {
const auto ptr = _var->as<bool>();
if (!ptr) {
return error("Could not cast the node to bool!");
}
return **ptr;
} else if constexpr (std::is_floating_point<std::remove_cvref_t<T>>()) {
const auto ptr = _var->as<double>();
if (!ptr) {
return error("Could not cast the node to double!");
}
return static_cast<std::remove_cvref_t<T>>(**ptr);
} else if constexpr (std::is_integral<std::remove_cvref_t<T>>()) {
const auto ptr = _var->as<int64_t>();
if (!ptr) {
return error("Could not cast the node to int64_t!");
}
return static_cast<std::remove_cvref_t<T>>(**ptr);
} else {
static_assert(rfl::always_false_v<T>, "Unsupported type.");
}
}
rfl::Result<InputArrayType> to_array(
const InputVarType& _var) const noexcept {
const auto ptr = _var->as_array();
if (!ptr) {
return error("Could not cast to an array!");
}
return ptr;
}
template <class ArrayReader>
std::optional<Error> read_array(const ArrayReader& _array_reader,
const InputArrayType& _arr) const noexcept {
for (auto& node : *_arr) {
const auto err = _array_reader.read(&node);
if (err) {
return err;
}
}
return std::nullopt;
}
template <class ObjectReader>
std::optional<Error> read_object(const ObjectReader& _object_reader,
InputObjectType _obj) const noexcept {
for (auto& [k, v] : *_obj) {
_object_reader.read(std::string_view(k), &v);
}
return std::nullopt;
}
rfl::Result<InputObjectType> to_object(
const InputVarType& _var) const noexcept {
const auto ptr = _var->as_table();
if (!ptr) {
return error("Could not cast to a table!");
}
return ptr;
}
template <class T>
rfl::Result<T> use_custom_constructor(
const InputVarType _var) const noexcept {
try {
return T::from_toml_obj(_var);
} catch (std::exception& e) {
return error(e.what());
}
}
};
} // namespace rfl::toml
#endif
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