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/*
* This source code is released into the public domain.
*/
module;
#include <iosfwd>
#include <string>
export module nihil.config:option;
import nihil.ucl;
import :error;
namespace nihil::config {
/*
* Base class for options; this is what config_store interacts with.
*/
export struct option
{
// Short name of this option.
auto name(this option const &self) noexcept -> std::string_view;
// Human-readable description of this option.
auto description(this option const &self) noexcept -> std::string_view;
// If true, this option is set to its default value.
auto is_default(this option const &self) noexcept -> bool;
// Get or set this option as a string.
auto string(this option const &self) -> std::string;
auto string(this option &self, std::string_view value) -> void;
/*
* Return this object as a UCL object. This is used when writing the
* configuration file.
*/
virtual auto to_ucl() const -> ucl::object = 0;
/*
* Set this object from a UCL object. This is used when reading the
* configuration file.
*/
virtual auto from_ucl(ucl::object const &) -> void = 0;
// Not copyable or movable.
option(option const &) = delete;
auto operator=(option const &) -> option& = delete;
protected:
option(std::string_view name, std::string_view description);
auto is_default(bool b) -> void;
/*
* Get or set this option as a string.
*/
virtual auto get_string() const -> std::string = 0;
virtual auto set_string(std::string_view) -> void = 0;
private:
std::string _name;
std::string _description;
bool _is_default = true;
};
/*
* Make options printable. This is mostly useful for testing.
*/
export auto operator<<(std::ostream &strm, option const &opt) -> std::ostream &;
} // namespace nihil
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