dolphin/Source/Core/Common/Config/Layer.h

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// Copyright 2016 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#include "Common/Config/ConfigInfo.h"
#include "Common/Config/Enums.h"
#include "Common/StringUtil.h"
namespace Config
{
namespace detail
{
template <typename T, std::enable_if_t<!std::is_enum<T>::value>* = nullptr>
std::optional<T> TryParse(const std::string& str_value)
{
T value;
if (!::TryParse(str_value, &value))
return std::nullopt;
return value;
}
template <typename T, std::enable_if_t<std::is_enum<T>::value>* = nullptr>
std::optional<T> TryParse(const std::string& str_value)
{
const auto result = TryParse<std::underlying_type_t<T>>(str_value);
if (result)
return static_cast<T>(*result);
return {};
}
template <>
inline std::optional<std::string> TryParse(const std::string& str_value)
{
return str_value;
}
} // namespace detail
template <typename T>
class Info;
class Layer;
using LayerMap = std::map<Location, std::optional<std::string>>;
class ConfigLayerLoader
{
public:
explicit ConfigLayerLoader(LayerType layer);
virtual ~ConfigLayerLoader();
virtual void Load(Layer* config_layer) = 0;
virtual void Save(Layer* config_layer) = 0;
LayerType GetLayer() const;
private:
const LayerType m_layer;
};
class Section
{
public:
using iterator = LayerMap::iterator;
Section(iterator begin_, iterator end_) : m_begin(begin_), m_end(end_) {}
iterator begin() const { return m_begin; }
iterator end() const { return m_end; }
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private:
iterator m_begin;
iterator m_end;
};
class ConstSection
{
public:
using iterator = LayerMap::const_iterator;
ConstSection(iterator begin_, iterator end_) : m_begin(begin_), m_end(end_) {}
iterator begin() const { return m_begin; }
iterator end() const { return m_end; }
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private:
iterator m_begin;
iterator m_end;
};
class Layer
{
public:
explicit Layer(LayerType layer);
explicit Layer(std::unique_ptr<ConfigLayerLoader> loader);
virtual ~Layer();
// Convenience functions
bool Exists(const Location& location) const;
bool DeleteKey(const Location& location);
void DeleteAllKeys();
template <typename T>
T Get(const Info<T>& config_info) const
{
return Get<T>(config_info.GetLocation()).value_or(config_info.GetDefaultValue());
}
template <typename T>
std::optional<T> Get(const Location& location) const
{
const auto iter = m_map.find(location);
if (iter == m_map.end() || !iter->second.has_value())
return std::nullopt;
return detail::TryParse<T>(*iter->second);
}
template <typename T>
bool Set(const Info<T>& config_info, const std::common_type_t<T>& value)
{
return Set(config_info.GetLocation(), value);
}
template <typename T>
bool Set(const Location& location, const T& value)
{
return Set(location, ValueToString(value));
}
bool Set(const Location& location, std::string new_value)
{
const auto iter = m_map.find(location);
if (iter != m_map.end() && iter->second == new_value)
return false;
m_is_dirty = true;
m_map.insert_or_assign(location, std::move(new_value));
return true;
}
void MarkAsDirty() { m_is_dirty = true; }
Section GetSection(System system, const std::string& section);
ConstSection GetSection(System system, const std::string& section) const;
// Explicit load and save of layers
void Load();
void Save();
LayerType GetLayer() const;
const LayerMap& GetLayerMap() const;
protected:
bool m_is_dirty = false;
LayerMap m_map;
const LayerType m_layer;
std::unique_ptr<ConfigLayerLoader> m_loader;
};
} // namespace Config