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/*
* This file is part of smolbote. It's copyrighted by the contributors recorded
* in the version control history of the file, available from its original
* location: https://neueland.iserlohn-fortress.net/gitea/aqua/smolbote
*
* SPDX-License-Identifier: GPL-3.0
*/
#ifndef SMOLBOTE_CONFIGURATION_H
#define SMOLBOTE_CONFIGURATION_H
#include <initializer_list>
#include <memory>
#include <optional>
#include <string>
#include <type_traits>
#include <unordered_map>
#include <variant>
#if defined(__clang__)
#define consumable(X) [[clang::consumable(X)]]
#define return_typestate(X) [[clang::return_typestate(X)]]
#define callable_when(X) [[clang::callable_when(X)]]
#define param_typestate(X) [[clang::param_typestate(X)]]
#else
#define consumable(X)
#define return_typestate(X)
#define callable_when(X)
#define param_typestate(X)
#endif
typedef std::variant<std::string, int, bool> conf_value_t;
template <typename T>
concept concept_value_t = std::is_arithmetic<T>::value || std::is_same<T, bool>::value || std::is_constructible<T, std::string>::value;
class consumable(unconsumed) Configuration : private std::unordered_map<std::string, conf_value_t>
{
friend std::ostream &operator<<(std::ostream &out, const Configuration &obj);
public:
return_typestate(unconsumed) Configuration();
return_typestate(unconsumed) Configuration(const std::initializer_list<std::pair<std::string, conf_value_t>> &list) noexcept;
Configuration(const Configuration &) = delete;
Configuration &operator=(const Configuration &) = delete;
return_typestate(unconsumed) Configuration(Configuration && other param_typestate(unconsumed)) = default;
Configuration &operator=(Configuration &&) = delete;
~Configuration() = default;
callable_when(unconsumed) void read_file(const std::string &location);
callable_when(unconsumed) void read(std::basic_istream<char> & input);
template <typename T>
callable_when(unconsumed) [[nodiscard]] std::optional<T> value(const char *path) const
{
if(use_global) {
return instance()->value<T>(path);
}
if(count(path) == 0) {
return std::nullopt;
}
return std::get<T>(at(path));
}
template <concept_value_t T>
callable_when(unconsumed) [[nodiscard]] std::optional<T> value(const char *path) const
{
if(use_global) {
return instance()->value<T>(path);
}
if(this->count(path) == 0) {
return std::nullopt;
}
// path is guaranteed to exist
const auto value = at(path);
if(std::holds_alternative<int>(value)) {
if constexpr(std::is_arithmetic<T>::value) {
return static_cast<T>(std::get<int>(value));
} else if constexpr(std::is_constructible<T, std::string>::value) {
return T{ std::to_string(std::get<int>(value)) };
}
} else if(std::holds_alternative<bool>(value)) {
if constexpr(std::is_constructible<T, bool>::value) {
return std::get<bool>(value);
} else if constexpr(std::is_constructible<T, const char *>::value) {
return std::get<bool>(value) ? T{ "true" } : T{ "false" };
}
} else if(std::holds_alternative<std::string>(value)) {
auto str = std::get<std::string>(value);
try {
if constexpr(std::is_floating_point<T>::value) {
return static_cast<T>(std::stod(str));
} else if constexpr(std::is_arithmetic<T>::value) {
return static_cast<T>(std::stol(str));
}
} catch(std::invalid_argument &) {
return std::nullopt;
}
if(str.front() == '~') {
str.replace(0, 1, m_homePath);
}
if constexpr(std::is_constructible<T, std::string>::value) {
return T{ str };
}
}
return std::nullopt;
}
template <typename T>
callable_when(unconsumed) T &shortcut(T & /* unused */, const char * /* unused */) const
{
return T{};
}
callable_when(unconsumed) void setValue(const std::string &key, const std::string &value);
bool make_global();
private:
static Configuration *instance();
const std::string m_homePath;
const bool use_global = false;
};
#ifndef NO_QT_SPEC
#include "qt_specialization.h"
#endif
std::ostream &operator<<(std::ostream &out, const Configuration &obj);
#endif // SMOLBOTE_CONFIGURATION_H
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