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/*
* This source code is released into the public domain.
*/
module;
/*
* The configuration store. There should only be one of these.
*/
#include <coroutine>
#include <string>
#include <map>
export module nihil.config:store;
import nihil;
import :error;
import :option;
namespace nihil::config {
// Exception thrown on an attempt to fetch an undefined option.
export struct unknown_option final : error {
unknown_option(std::string_view option_name);
auto option_name(this unknown_option const &self) -> std::string_view;
private:
std::string _option_name;
};
struct store final {
/*
* Get the global config store.
*/
static auto get() -> store &;
/*
* Register a new value with the config store.
*/
auto register_option(this store &self, option *object) -> void;
/*
* Remove a value from the config store.
*/
auto unregister_option(this store &self, option *object) -> void;
/*
* Fetch an existing value in the config store.
*/
auto fetch(this store const &self, std::string_view name) -> option &;
/*
* Fetch all values in the configuration store.
*/
auto all(this store const &self) -> nihil::generator<option const &>;
// Not movable or copyable.
store(store const &) = delete;
store(store &&) = delete;
store& operator=(store const &) = delete;
store& operator=(store &&) = delete;
private:
/*
* The global configuration store, created by init() and accessed via
* get().
*/
inline static store *instance = nullptr;
std::map<std::string_view, option *> options;
store() = default;
};
/*
* The public API.
*/
export auto get_option(std::string_view option_name) -> option &;
} // namespace nihil::config
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