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◆ main openmsx / src / settings / EnumSetting.hh
3.4 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#ifndef ENUMSETTING_HH
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#define ENUMSETTING_HH
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#include "Setting.hh"
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#include <concepts>
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#include <iterator>
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#include <ranges>
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#include <utility>
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#include <vector>
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namespace openmsx {
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class TclObject;
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// non-templatized base class
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class EnumSettingBase
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{
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public:
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	struct MapEntry {
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		template<typename Enum>
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		MapEntry(std::string_view name_, Enum value_)
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			: name(name_), value(static_cast<int>(value_)) {}
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		std::string name; // cannot be string_view because of the 'default_machine' setting
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		int value;
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	};
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	using Map = std::vector<MapEntry>;
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	[[nodiscard]] const auto& getMap() const { return baseMap; }
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	explicit EnumSettingBase(Map&& m);
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	[[nodiscard]] int fromStringBase(std::string_view str) const;
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	[[nodiscard]] std::string_view toStringBase(int value) const;
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	[[nodiscard]] auto getPossibleValues() const {
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		return std::views::transform(baseMap,
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			[](const auto& e) -> std::string_view { return e.name; });
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	}
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	void additionalInfoBase(TclObject& result) const;
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	void tabCompletionBase(std::vector<std::string>& tokens) const;
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private:
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	Map baseMap;
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};
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template<typename T>
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concept EnumSettingValue = requires(T t, int i) {
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	static_cast<T>(i);
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	static_cast<int>(t);
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};
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template<EnumSettingValue T> class EnumSetting final : public EnumSettingBase, public Setting
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{
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public:
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	using Map = EnumSettingBase::Map;
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	EnumSetting(CommandController& commandController, std::string_view name,
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	            static_string_view description, T initialValue,
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	            Map&& map_, Save save = Save::YES);
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	[[nodiscard]] std::string_view getTypeString() const override;
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	void additionalInfo(TclObject& result) const override;
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	void tabCompletion(std::vector<std::string>& tokens) const override;
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	[[nodiscard]] T getEnum() const noexcept;
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	void setEnum(T e);
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	[[nodiscard]] std::string_view getString() const;
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private:
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	std::string_view toString(T e) const;
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};
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//-------------
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template<EnumSettingValue T>
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EnumSetting<T>::EnumSetting(
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		CommandController& commandController_, std::string_view name,
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		static_string_view description_, T initialValue,
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		Map&& map, Save save_)
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	: EnumSettingBase(std::move(map))
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	, Setting(commandController_, name, description_,
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	          TclObject(EnumSettingBase::toStringBase(static_cast<int>(initialValue))), save_)
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{
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	setChecker([this](const TclObject& newValue) {
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		(void)fromStringBase(newValue.getString()); // may throw
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	});
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	init();
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}
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template<EnumSettingValue T>
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std::string_view EnumSetting<T>::getTypeString() const
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{
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	return "enumeration";
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}
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template<EnumSettingValue T>
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void EnumSetting<T>::additionalInfo(TclObject& result) const
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{
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	additionalInfoBase(result);
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}
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template<EnumSettingValue T>
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void EnumSetting<T>::tabCompletion(std::vector<std::string>& tokens) const
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{
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	tabCompletionBase(tokens);
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}
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template<EnumSettingValue T>
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T EnumSetting<T>::getEnum() const noexcept
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{
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	return static_cast<T>(fromStringBase(getValue().getString()));
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}
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template<> inline bool EnumSetting<bool>::getEnum() const noexcept
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{
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	// _exactly_ the same functionality as above, but suppress VS warning
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	return fromStringBase(getValue().getString()) != 0;
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}
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template<EnumSettingValue T>
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void EnumSetting<T>::setEnum(T e)
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{
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	setValue(TclObject(toString(e)));
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}
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template<EnumSettingValue T>
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std::string_view EnumSetting<T>::getString() const
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{
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	return getValue().getString();
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}
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template<EnumSettingValue T>
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std::string_view EnumSetting<T>::toString(T e) const
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{
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	return toStringBase(static_cast<int>(e));
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}
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} // namespace openmsx
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#endif