transmission/libtransmission/interned-string.h

179 lines
4.2 KiB
C++

// This file Copyright © 2021-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include <string_view>
#include <fmt/format.h>
#include "quark.h"
/**
* Helper functions wrapped around tr_quark
*/
class tr_interned_string
{
public:
tr_interned_string() = default;
explicit tr_interned_string(tr_quark quark)
: quark_{ quark }
, sv_{ tr_quark_get_string_view(quark_) }
{
}
explicit tr_interned_string(std::string_view sv)
: tr_interned_string{ tr_quark_new(sv) }
{
}
explicit tr_interned_string(char const* c_str)
: tr_interned_string{ std::string_view{ c_str ? c_str : "" } }
{
}
tr_interned_string& operator=(tr_quark quark)
{
quark_ = quark;
sv_ = tr_quark_get_string_view(quark_);
return *this;
}
tr_interned_string& operator=(std::string_view sv)
{
return *this = tr_quark_new(sv);
}
tr_interned_string& operator=(char const* c_str)
{
return *this = std::string_view{ c_str != nullptr ? c_str : "" };
}
[[nodiscard]] constexpr auto quark() const noexcept
{
return quark_;
}
[[nodiscard]] constexpr auto sv() const noexcept
{
return sv_;
}
[[nodiscard]] constexpr char const* c_str() const noexcept
{
return std::data(sv()); // tr_quark strs are always zero-terminated
}
[[nodiscard]] constexpr auto data() const noexcept
{
return std::data(sv());
}
[[nodiscard]] constexpr auto empty() const noexcept
{
return quark_ == TR_KEY_NONE;
}
[[nodiscard]] constexpr auto size() const noexcept
{
return std::size(sv());
}
constexpr void clear()
{
*this = tr_interned_string{};
}
[[nodiscard]] constexpr auto begin() const noexcept
{
return std::begin(sv());
}
[[nodiscard]] constexpr auto end() const noexcept
{
return std::end(sv());
}
[[nodiscard]] constexpr auto rbegin() const noexcept
{
return std::rbegin(sv());
}
[[nodiscard]] constexpr auto rend() const noexcept
{
return std::rend(sv());
}
[[nodiscard]] constexpr auto compare(tr_interned_string const& that) const noexcept // <=>
{
if (this->quark() < that.quark())
{
return -1;
}
if (this->quark() > that.quark())
{
return 1;
}
return 0;
}
[[nodiscard]] constexpr bool operator<(tr_interned_string const& that) const noexcept
{
return this->compare(that) < 0;
}
[[nodiscard]] constexpr bool operator>(tr_interned_string const& that) const noexcept
{
return this->compare(that) > 0;
}
[[nodiscard]] constexpr bool operator==(tr_interned_string const& that) const noexcept
{
return this->compare(that) == 0;
}
[[nodiscard]] constexpr bool operator!=(tr_interned_string const& that) const noexcept
{
return this->compare(that) != 0;
}
[[nodiscard]] constexpr auto operator==(std::string_view that) const noexcept
{
return sv() == that;
}
[[nodiscard]] constexpr auto operator!=(std::string_view that) const noexcept
{
return sv() != that;
}
[[nodiscard]] constexpr bool operator==(char const* that) const noexcept
{
return *this == std::string_view{ that != nullptr ? that : "" };
}
[[nodiscard]] constexpr bool operator!=(char const* that) const noexcept
{
return *this != std::string_view{ that != nullptr ? that : "" };
}
[[nodiscard]] constexpr operator std::string_view() const noexcept
{
return sv();
}
private:
tr_quark quark_ = TR_KEY_NONE;
std::string_view sv_ = "";
};
template<>
struct fmt::formatter<tr_interned_string> : formatter<std::string_view>
{
template<typename FormatContext>
constexpr auto format(tr_interned_string const& is, FormatContext& ctx) const
{
return formatter<std::string_view>::format(is.sv(), ctx);
}
};