keyboard_key.hpp

// Copyright Take Vos 2020.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "keyboard_modifiers.hpp"
#include "keyboard_virtual_key.hpp"
#include "../hash.hpp"
#include "../exception.hpp"
#include "../strings.hpp"
#include <string_view>
#include <unordered_map>
 
namespace tt {
 
class keyboard_key {
    keyboard_modifiers modifiers;
 
    keyboard_virtual_key virtualKey;
 
public:
    constexpr keyboard_key() noexcept :
        modifiers(keyboard_modifiers::None), virtualKey(keyboard_virtual_key::Nul) {}
 
    constexpr keyboard_key(keyboard_modifiers modifiers, keyboard_virtual_key key) noexcept :
        modifiers(modifiers), virtualKey(key) {}
 
    keyboard_key(std::string_view key_combination) :
        modifiers(keyboard_modifiers::None), virtualKey(keyboard_virtual_key::Nul)
    {
        ttlet modifiers_and_vkey = split(key_combination, '+');
        tt_assert(modifiers_and_vkey.cbegin() != modifiers_and_vkey.cend());
 
        ttlet end_modifiers = modifiers_and_vkey.cend() - 1;
        for (auto i = modifiers_and_vkey.cbegin(); i != end_modifiers; ++i) {
            modifiers |= to_keyboard_modifiers(*i);
        }
 
        virtualKey = to_keyboard_virtual_key(modifiers_and_vkey.back());
    }
 
    size_t hash() const noexcept {
        return hash_mix(modifiers, virtualKey);
    }
 
    [[nodiscard]] friend bool operator==(keyboard_key const &lhs, keyboard_key const &rhs) noexcept {
        return lhs.modifiers == rhs.modifiers && lhs.virtualKey == rhs.virtualKey;
    }
    [[nodiscard]] friend bool operator!=(keyboard_key const &lhs, keyboard_key const &rhs) noexcept {
        return !(lhs == rhs);
    }
 
    [[nodiscard]] friend std::string to_string(keyboard_key const &rhs) noexcept {
        return std::format("{}{}", rhs.modifiers, rhs.virtualKey);
    }
 
    friend std::ostream &operator<<(std::ostream &lhs, keyboard_key const &rhs) {
        return lhs << to_string(rhs);
    }
};
 
}
 
namespace std {
 
template<>
struct hash<tt::keyboard_key> {
    [[nodiscard]] size_t operator() (tt::keyboard_key const &rhs) const noexcept {
        return rhs.hash();
    }
};
 
}