iso_15924.hpp

// Copyright Take Vos 2021-2022.
// 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 "../utility/module.hpp"
#include <string_view>
#include <cstdint>
#include <format>
 
namespace hi::inline v1 {

class iso_15924 {
public:
    constexpr iso_15924() noexcept : _v(0) {}
    constexpr iso_15924(iso_15924 const&) noexcept = default;
    constexpr iso_15924(iso_15924&&) noexcept = default;
    constexpr iso_15924& operator=(iso_15924 const&) noexcept = default;
    constexpr iso_15924& operator=(iso_15924&&) noexcept = default;
 
    constexpr iso_15924(std::integral auto number) : _v(0)
    {
        hi_check_bounds(number, 0, 1000);
        _v = narrow_cast<uint16_t>(number);
    }
 
    iso_15924(std::string_view code4);
 
    constexpr iso_15924(intrinsic_t, uint16_t v) noexcept : _v(v)
    {
        hi_axiom_bounds(_v, 0, 1000);
    }
 
    [[nodiscard]] constexpr uint16_t const& intrinsic() const noexcept
    {
        return _v;
    }
 
    [[nodiscard]] constexpr uint16_t& intrinsic() noexcept
    {
        return _v;
    }
 
    [[nodiscard]] constexpr bool empty() const noexcept
    {
        return _v == 0;
    }
 
    explicit operator bool() const noexcept
    {
        return not empty();
    }

    [[nodiscard]] constexpr uint16_t number() const noexcept
    {
        return _v;
    }

    [[nodiscard]] std::string_view code4() const noexcept;

    [[nodiscard]] std::string_view code4_open_type() const noexcept;

    [[nodiscard]] bool left_to_right() const noexcept;
 
    [[nodiscard]] constexpr friend bool operator==(iso_15924 const& lhs, iso_15924 const& rhs) noexcept = default;
    [[nodiscard]] constexpr friend auto operator<=>(iso_15924 const& lhs, iso_15924 const& rhs) noexcept = default;

    [[nodiscard]] constexpr friend bool matches(iso_15924 const& lhs, iso_15924 const& rhs) noexcept
    {
        return lhs.empty() or lhs == rhs;
    }
 
private:
    uint16_t _v;
};
 
} // namespace hi::inline v1
 
template<>
struct std::hash<hi::iso_15924> {
    [[nodiscard]] size_t operator()(hi::iso_15924 const& rhs) const noexcept
    {
        return std::hash<uint16_t>{}(rhs.number());
    }
};