269 lines
11 KiB
C++
269 lines
11 KiB
C++
// _ _ __ _____
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// | \ | | / _| / ____|_ _
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// | \| | __ _ _ __ ___ ___ ___ | |_ | | _| |_ _| |_
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// | . ` |/ _` | '_ ` _ \ / _ \/ _ \| _| | | |_ _|_ _|
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// | |\ | (_| | | | | | | __/ (_) | | | |____|_| |_|
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// |_| \_|\__,_|_| |_| |_|\___|\___/|_| \_____|
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// https://github.com/Neargye/nameof
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// vesion 0.8.1
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//
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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// SPDX-License-Identifier: MIT
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// Copyright (c) 2016, 2018 - 2019 Daniil Goncharov <neargye@gmail.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#pragma once
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#include <array>
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#include <cstddef>
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#include <limits>
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#include <type_traits>
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#include <string_view>
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// Enum value must be greater or equals than NAMEOF_ENUM_RANGE_MIN. By default NAMEOF_ENUM_RANGE_MIN = -128.
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// If need another min range for all enum types by default, redefine the macro NAMEOF_ENUM_RANGE_MIN.
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#if !defined(NAMEOF_ENUM_RANGE_MIN)
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# define NAMEOF_ENUM_RANGE_MIN -128
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#endif
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// Enum value must be less or equals than NAMEOF_ENUM_RANGE_MAX. By default NAMEOF_ENUM_RANGE_MAX = 128.
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// If need another max range for all enum types by default, redefine the macro NAMEOF_ENUM_RANGE_MAX.
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#if !defined(NAMEOF_ENUM_RANGE_MAX)
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# define NAMEOF_ENUM_RANGE_MAX 128
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#endif
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namespace nameof {
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// Enum value must be in range [-NAMEOF_ENUM_RANGE_MAX, NAMEOF_ENUM_RANGE_MIN]. By default NAMEOF_ENUM_RANGE_MIN = -128, NAMEOF_ENUM_RANGE_MAX = 128.
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// If need another range for all enum types by default, redefine the macro NAMEOF_ENUM_RANGE_MAX and NAMEOF_ENUM_RANGE_MIN.
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// If need another range for specific enum type, add specialization enum_range for necessary enum type.
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template <typename E>
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struct enum_range final {
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static_assert(std::is_enum_v<E>, "nameof::enum_range requires enum type.");
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static constexpr int min = std::is_signed_v<std::underlying_type_t<E>> ? NAMEOF_ENUM_RANGE_MIN : 0;
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static constexpr int max = NAMEOF_ENUM_RANGE_MAX;
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static_assert(max > min, "nameof::enum_range requires max > min.");
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};
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namespace detail {
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template <typename T>
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struct identity final {
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using type = T;
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};
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template <typename... T>
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[[nodiscard]] constexpr std::string_view nameof_type_impl() noexcept {
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#if defined(__clang__)
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constexpr auto prefix = sizeof("std::string_view nameof::detail::nameof_type_impl() [T = <nameof::detail::identity<") - 1;
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constexpr auto suffix = sizeof(">>]") - 1;
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constexpr std::string_view name{__PRETTY_FUNCTION__ + prefix, sizeof(__PRETTY_FUNCTION__) - prefix - suffix - 1};
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#elif defined(__GNUC__)
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constexpr auto prefix = sizeof("constexpr std::string_view nameof::detail::nameof_type_impl() [with T = {nameof::detail::identity<") - 1;
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constexpr auto suffix = sizeof(">}; std::string_view = std::basic_string_view<char>]") - 1;
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constexpr std::string_view name{__PRETTY_FUNCTION__ + prefix, sizeof(__PRETTY_FUNCTION__) - prefix - suffix - 1};
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#elif defined(_MSC_VER)
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constexpr auto prefix = sizeof("class std::basic_string_view<char,struct std::char_traits<char> > __cdecl nameof::detail::nameof_type_impl<struct nameof::detail::identity<") - 1;
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constexpr auto suffix = sizeof(">>(void) noexcept") - 1;
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constexpr std::string_view name{__FUNCSIG__ + prefix, sizeof(__FUNCSIG__) - prefix - suffix - 1};
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#else
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return {}; // Unsupported compiler.
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#endif
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#if defined(__clang__) || defined(__GNUC__) || defined(_MSC_VER)
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return name.substr(0, name.length() - (name.back() == ' ' ? 1 : 0));
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#endif
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}
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template <typename E, E V>
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[[nodiscard]] constexpr std::string_view enum_name_impl() noexcept {
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static_assert(std::is_enum_v<E>, "nameof::enum_name_impl requires enum type.");
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#if defined(__clang__)
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constexpr std::string_view name{__PRETTY_FUNCTION__};
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constexpr auto suffix = sizeof("]") - 1;
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#elif defined(__GNUC__) && __GNUC__ >= 9
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constexpr std::string_view name{__PRETTY_FUNCTION__};
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constexpr auto suffix = sizeof("; std::string_view = std::basic_string_view<char>]") - 1;
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#elif defined(_MSC_VER)
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constexpr std::string_view name{__FUNCSIG__};
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constexpr auto suffix = sizeof(">(void) noexcept") - 1;
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#else
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return {}; // Unsupported compiler.
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#endif
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#if defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 9) || defined(_MSC_VER)
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constexpr auto prefix = name.find_last_of(" :,-)", name.length() - suffix) + 1;
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if constexpr (name[prefix] >= '0' && name[prefix] <= '9') {
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return {}; // Value does not have name.
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} else {
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return name.substr(prefix, name.length() - prefix - suffix);
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}
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#endif
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}
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template <typename E, int O, int... I>
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[[nodiscard]] constexpr decltype(auto) enum_names_impl(std::integer_sequence<int, I...>) noexcept {
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static_assert(std::is_enum_v<E>, "nameof::detail::enum_strings_impl requires enum type.");
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constexpr std::array<std::string_view, sizeof...(I)> names{{enum_name_impl<E, static_cast<E>(I + O)>()...}};
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return names;
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}
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template <typename T>
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struct check final {
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using type = void;
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};
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template <typename T>
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using check_t = typename check<T>::type;
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template <typename T>
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[[nodiscard]] constexpr std::string_view nameof_impl(std::string_view name, bool with_template_suffix) noexcept {
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static_assert(std::is_void_v<T>, "nameof::detail::nameof_impl requires void type.");
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if (name.length() >= 1 && (name.front() == '"' || name.front() == '\'')) {
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return {}; // Narrow multibyte string literal.
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} else if (name.length() >= 2 && name[0] == 'R' && (name[1] == '"' || name[1] == '\'')) {
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return {}; // Raw string literal.
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} else if (name.length() >= 2 && name[0] == 'L' && (name[1] == '"' || name[1] == '\'')) {
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return {}; // Wide string literal.
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} else if (name.length() >= 2 && name[0] == 'U' && (name[1] == '"' || name[1] == '\'')) {
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return {}; // UTF-32 encoded string literal.
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} else if (name.length() >= 2 && name[0] == 'u' && (name[1] == '"' || name[1] == '\'')) {
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return {}; // UTF-16 encoded string literal.
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} else if (name.length() >= 3 && name[0] == 'u' && name[1] == '8' && (name[2] == '"' || name[2] == '\'')) {
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return {}; // UTF-8 encoded string literal.
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} else if (name.length() >= 1 && (name.front() >= '0' && name.front() <= '9')) {
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return {}; // Invalid name.
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}
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for (std::size_t i = name.length(), h = 0, s = 0; i > 0; --i) {
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if (name[i - 1] == ')') {
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++h;
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++s;
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continue;
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} else if (name[i - 1] == '(') {
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--h;
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++s;
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continue;
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}
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if (h == 0) {
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name.remove_suffix(s);
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break;
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} else {
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++s;
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continue;
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}
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}
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std::size_t s = 0;
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for (std::size_t i = name.length(), h = 0; i > 0; --i) {
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if (name[i - 1] == '>') {
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++h;
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++s;
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continue;
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} else if (name[i - 1] == '<') {
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--h;
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++s;
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continue;
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}
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if (h == 0) {
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break;
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} else {
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++s;
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continue;
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}
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}
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for (std::size_t i = name.length() - s; i > 0; --i) {
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if (!((name[i - 1] >= '0' && name[i - 1] <= '9') ||
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(name[i - 1] >= 'a' && name[i - 1] <= 'z') ||
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(name[i - 1] >= 'A' && name[i - 1] <= 'Z') ||
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(name[i - 1] == '_'))) {
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name.remove_prefix(i);
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break;
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}
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}
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name.remove_suffix(with_template_suffix ? 0 : s);
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if (name.length() > 0 && ((name.front() >= 'a' && name.front() <= 'z') ||
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(name.front() >= 'A' && name.front() <= 'Z') ||
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(name.front() == '_'))) {
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return name;
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} else {
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return {}; // Invalid name.
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}
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}
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template <typename T>
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[[nodiscard]] constexpr std::string_view nameof_raw_impl(std::string_view name) noexcept {
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static_assert(std::is_void_v<T>, "nameof::detail::nameof_raw_impl requires void type.");
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return name;
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}
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} // namespace nameof::detail
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// Obtains simple (unqualified) string enum name of enum variable.
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template <typename E, typename = std::enable_if_t<std::is_enum_v<std::decay_t<E>>>>
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[[nodiscard]] constexpr std::string_view nameof_enum(E value) noexcept {
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using D = std::decay_t<E>;
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static_assert(std::is_enum_v<D>, "nameof::nameof_enum requires enum type.");
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static_assert(enum_range<D>::max > enum_range<D>::min, "nameof::enum_range requires max > min.");
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using U = std::underlying_type_t<D>;
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constexpr int max = enum_range<D>::max < (std::numeric_limits<U>::max)() ? enum_range<D>::max : (std::numeric_limits<U>::max)();
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constexpr int min = enum_range<D>::min > (std::numeric_limits<U>::min)() ? enum_range<D>::min : (std::numeric_limits<U>::min)();
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constexpr auto range = std::make_integer_sequence<int, max - min + 1>{};
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constexpr auto names = detail::enum_names_impl<D, min>(range);
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const int i = static_cast<int>(value) - min;
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if (i >= 0 && static_cast<std::size_t>(i) < names.size()) {
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return names[i];
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} else {
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return {}; // Value out of range.
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}
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}
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// Obtains string name of type.
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template <typename T>
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[[nodiscard]] constexpr std::string_view nameof_type() noexcept {
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return detail::nameof_type_impl<detail::identity<T>>();
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}
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} // namespace nameof
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// NAMEOF obtains simple (unqualified) string name of variable, function, enum, macro.
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#define NAMEOF(...) ::nameof::detail::nameof_impl<::nameof::detail::check_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__, false)
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// Obtains simple (unqualified) full (with template suffix) string name of variable, function, enum, macro.
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#define NAMEOF_FULL(...) ::nameof::detail::nameof_impl<::nameof::detail::check_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__, true)
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// Obtains raw string name of variable, function, enum, macro.
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#define NAMEOF_RAW(...) ::nameof::detail::nameof_raw_impl<::nameof::detail::check_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__)
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// Obtains simple (unqualified) string enum name of enum variable.
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#define NAMEOF_ENUM(...) ::nameof::nameof_enum<decltype(__VA_ARGS__)>(__VA_ARGS__)
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// Obtains string name of type.
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#define NAMEOF_TYPE(...) ::nameof::nameof_type<__VA_ARGS__>()
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// Obtains string name of variable type.
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#define NAMEOF_VAR_TYPE(...) ::nameof::nameof_type<decltype(__VA_ARGS__)>()
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