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