307 lines
10 KiB
C++
307 lines
10 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 0.5.0
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//
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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// Copyright (c) 2016, 2018 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 <cstddef>
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#include <type_traits>
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#include <ostream>
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namespace nameof {
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namespace detail {
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template <typename T>
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struct identity {
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using type = T;
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};
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template <typename T>
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struct remove_all_pointers
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: std::conditional_t<std::is_pointer<T>::value,
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remove_all_pointers<typename std::remove_pointer<T>::type>,
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identity<T>> {};
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class cstring final {
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const char* str_;
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std::size_t size_;
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public:
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constexpr cstring(const char* str, std::size_t size) noexcept : str_(str), size_(size) {}
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template <std::size_t N>
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constexpr cstring(const char(&str)[N]) noexcept : str_(str), size_(N - 1) {}
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cstring() = delete;
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cstring(const cstring&) = default;
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cstring(cstring&&) = default;
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cstring& operator=(const cstring&) = default;
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cstring& operator=(cstring&&) = default;
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~cstring() = default;
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inline constexpr std::size_t size() const noexcept { return size_; }
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inline constexpr std::size_t length() const noexcept { return size_; }
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inline constexpr std::size_t max_size() const noexcept { return std::numeric_limits<decltype(size_)>::max(); }
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inline constexpr bool empty() const noexcept { return size_ == 0; }
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inline constexpr const char* begin() const noexcept { return str_; }
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inline constexpr const char* end() const noexcept { return str_ + size_; }
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inline constexpr const char* cbegin() const noexcept { return begin(); }
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inline constexpr const char* cend() const noexcept { return end(); }
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inline constexpr const char& operator[](std::size_t i) const { return str_[i]; }
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inline friend constexpr bool operator==(const cstring& lhs, const cstring& rhs) noexcept;
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inline friend constexpr bool operator!=(const cstring& lhs, const cstring& rhs) noexcept;
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template <std::size_t N>
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inline friend constexpr bool operator==(const cstring& lhs, const char(&str)[N]) noexcept;
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template <std::size_t N>
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inline friend constexpr bool operator!=(const cstring& lhs, const char(&str)[N]) noexcept;
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inline friend std::ostream& operator<<(std::ostream& os, const cstring& str);
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inline operator std::string() const { return std::string(begin(), end()); }
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};
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inline constexpr bool operator==(const cstring& lhs, const cstring& rhs) noexcept {
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if (lhs.size_ != rhs.size_)
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return false;
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for (std::size_t i = 0; i < lhs.size_; ++i) {
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if (lhs.str_[i] != rhs.str_[i])
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return false;
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}
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return true;
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}
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inline constexpr bool operator!=(const cstring& lhs, const cstring& rhs) noexcept {
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return !(lhs == rhs);
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}
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template <std::size_t N>
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inline constexpr bool operator==(const cstring& lhs, const char(&str)[N]) noexcept {
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return lhs == cstring{str, N - 1};
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}
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template <std::size_t N>
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constexpr bool operator!=(const cstring& lhs, const char(&str)[N]) noexcept {
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return !(lhs == cstring{str, N - 1});
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}
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inline std::ostream& operator<<(std::ostream& os, const cstring& str) {
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os.write(str.begin(), str.size());
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return os;
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}
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inline constexpr bool IsLexeme(char s) noexcept {
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return !((s >= '0' && s <= '9') || (s >= 'a' && s <= 'z') ||
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(s >= 'A' && s <= 'Z') || s == '_');
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}
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inline constexpr cstring NameofBase(const char* name, std::size_t length) noexcept {
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if (length == 0)
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return {name, length};
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for (std::size_t i = length; i > 0; --i) {
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if (IsLexeme(name[i - 1])) {
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return {&name[i], length - i};
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}
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}
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return {name, length};
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}
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inline constexpr cstring NameofFunction(const char* name, std::size_t length, bool with_template_prefix) noexcept {
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if (length == 0)
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return {name, length};
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std::size_t h = 0;
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std::size_t p = 0;
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for (std::size_t i = length; i > 0; --i) {
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if (name[i - 1] == '>') {
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++h;
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++p;
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continue;
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}
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if (name[i - 1] == '<') {
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--h;
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++p;
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continue;
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}
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if (h != 0) {
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++p;
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continue;
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}
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if (IsLexeme(name[i - 1]) && h == 0) {
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return {&name[i], length - i - (with_template_prefix ? 0 : p)};
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}
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}
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return {name, length - (with_template_prefix ? 0 : p)};
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}
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inline constexpr cstring NameofType(const char* name, std::size_t length) noexcept {
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if (length == 0)
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return {name, length};
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std::size_t h = 0;
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for (std::size_t i = length; i > 0; --i) {
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if (h == 0 && (name[i - 1] == '&' || name[i - 1] == '*')) {
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continue;
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}
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if (name[i - 1] == '>') {
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++h;
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continue;
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}
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if (name[i - 1] == '<') {
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--h;
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continue;
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}
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if (h != 0) {
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continue;
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}
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if (IsLexeme(name[i - 1]) && h == 0) {
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return {&name[i], length - i};
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}
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}
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return {name, length};
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}
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inline constexpr cstring NameofRaw(const char* name, std::size_t length) noexcept {
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return {name, length};
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}
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} // namespace detail
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template <typename T,
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typename = typename std::enable_if<!std::is_reference<T>::value &&
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!std::is_void<T>::value>::type>
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inline constexpr detail::cstring Nameof(const T&, const char* name, std::size_t length, bool with_template_prefix) noexcept {
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// TODO: conditional expression is constant
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if (std::is_function<T>::value || std::is_member_function_pointer<T>::value)
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return detail::NameofFunction(name, length, with_template_prefix);
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return detail::NameofBase(name, length);
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}
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template <typename T,
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typename = typename std::enable_if<!std::is_enum<T>::value &&
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!std::is_function<T>::value &&
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!std::is_member_function_pointer<T>::value>::type>
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inline constexpr detail::cstring Nameof(T&&, const char*, std::size_t) = delete;
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template <typename T>
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inline constexpr detail::cstring NameofType() {
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#if defined(__GNUC__) || defined(__clang__)
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constexpr auto function_name = __PRETTY_FUNCTION__;
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constexpr auto total_length = sizeof(__PRETTY_FUNCTION__) - 1;
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constexpr auto prefix_length = sizeof("nameof::detail::cstring nameof::NameofType() [T = ") - 1;
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constexpr auto suffix_length = sizeof("]") - 1;
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#elif defined(_MSC_VER)
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constexpr auto function_name = __FUNCSIG__;
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constexpr auto total_length = sizeof(__FUNCSIG__) - 1;
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constexpr auto prefix_length = sizeof("class nameof::detail::cstring __cdecl nameof::NameofType<") - 1;
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constexpr auto suffix_length = sizeof(">(void)") - 1;
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#endif
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constexpr auto type_name = detail::cstring{function_name + prefix_length, total_length - prefix_length - suffix_length};
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#if defined(_MSC_VER)
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constexpr auto class_length = sizeof("class") - 1;
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constexpr auto struct_length = sizeof("struct") - 1;
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constexpr auto enum_length = sizeof("enum") - 1;
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if (std::is_class<typename detail::remove_all_pointers<typename std::remove_reference<T>::type>::type>::value) {
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if (type_name[0] == 'c') {
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if (type_name[class_length] == ' ') {
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return detail::cstring{type_name.begin() + class_length + 1, type_name.length() - class_length - 1};
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}
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return detail::cstring{type_name.begin() + class_length, type_name.length() - class_length};
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}
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if (type_name[0] == 's') {
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if (type_name[struct_length] == ' ') {
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return detail::cstring{type_name.begin() + struct_length + 1, type_name.length() - struct_length - 1};
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}
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return detail::cstring{type_name.begin() + struct_length, type_name.length() - struct_length};
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}
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}
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if (std::is_enum<typename detail::remove_all_pointers<typename std::remove_reference<T>::type>::type>::value) {
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if (type_name[0] == 'e') {
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if (type_name[enum_length] == ' ') {
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return detail::cstring{type_name.begin() + enum_length + 1, type_name.length() - enum_length - 1};
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}
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return detail::cstring{type_name.begin() + enum_length, type_name.length() - enum_length};
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}
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}
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#endif
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return type_name;
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}
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} // namespace nameof
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#if defined(__GNUC__) || defined(__clang__)
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// Used to obtain the raw string name of a variable, type, member, function, macros.
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# define NAMEOF_RAW(name) ::nameof::detail::NameofRaw(#name, ((sizeof(#name) / sizeof(char)) - 1) + (0 * sizeof(void (*)(__typeof__(name)))))
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#elif defined(_MSC_VER)
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// Used to obtain the raw string name of a variable, type, member, function, macros.
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# define NAMEOF_RAW(name) ::nameof::detail::NameofRaw(#name, ((sizeof(#name) / sizeof(char)) - 1) + (0 * sizeof(typeid(name))))
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#endif
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// Used to obtain the simple (unqualified) string name of a variable, member, function.
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#define NAMEOF(name) ::nameof::Nameof<decltype(name)>(name, #name, (sizeof(#name) / sizeof(char)) - 1, false)
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#define NAMEOF_T(name) ::nameof::Nameof<decltype(name)>(name, #name, (sizeof(#name) / sizeof(char)) - 1, true)
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// Used to obtain the simple (unqualified) string name of a type.
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#define NAMEOF_TYPE(name) ::nameof::NameofType<decltype(name)>()
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