sol2/include/sol/demangle.hpp

// sol2

// The MIT License (MIT)

// Copyright (c) 2013-2021 Rapptz, ThePhD and contributors

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef SOL_DEMANGLE_HPP
#define SOL_DEMANGLE_HPP

#include <sol/string_view.hpp>
#include <string>
#include <array>
#include <cctype>
#if SOL_IS_ON(SOL_MINGW_CCTYPE_IS_POISONED_I_)
extern "C" {
#include <ctype.h>
}
#endif // MinGW is on some stuff
#include <locale>

namespace sol { namespace detail {
	inline constexpr std::array<string_view, 9> removals { { "{anonymous}",
		"(anonymous namespace)",
		"public:",
		"private:",
		"protected:",
		"struct ",
		"class ",
		"`anonymous-namespace'",
		"`anonymous namespace'" } };


#if SOL_IS_ON(SOL_COMPILER_GCC_I_) || SOL_IS_ON(SOL_COMPILER_CLANG_I_) || SOL_IS_ON(SOL_COMPILER_VCXX_CLANG_I_)
	inline std::string ctti_get_type_name_from_sig(std::string name) {
		// cardinal sins from MINGW
		using namespace std;
		std::size_t start = name.find_first_of('[');
		start = name.find_first_of('=', start);
		std::size_t end = name.find_last_of(']');
		if (end == std::string::npos)
			end = name.size();
		if (start == std::string::npos)
			start = 0;
		if (start < name.size() - 1)
			start += 1;
		name = name.substr(start, end - start);
		start = name.rfind("seperator_mark");
		if (start != std::string::npos) {
			name.erase(start - 2, name.length());
		}
		while (!name.empty() && isblank(name.front()))
			name.erase(name.begin());
		while (!name.empty() && isblank(name.back()))
			name.pop_back();

		for (std::size_t r = 0; r < removals.size(); ++r) {
			auto found = name.find(removals[r]);
			while (found != std::string::npos) {
				name.erase(found, removals[r].size());
				found = name.find(removals[r]);
			}
		}

		return name;
	}

	template <typename T, class seperator_mark = int>
	inline std::string ctti_get_type_name() {
		return ctti_get_type_name_from_sig(__PRETTY_FUNCTION__);
	}
#elif SOL_IS_ON(SOL_COMPILER_VCXX_I_)
	inline std::string ctti_get_type_name_from_sig(std::string name) {
		std::size_t start = name.find("get_type_name");
		if (start == std::string::npos)
			start = 0;
		else
			start += 13;
		if (start < name.size() - 1)
			start += 1;
		std::size_t end = name.find_last_of('>');
		if (end == std::string::npos)
			end = name.size();
		name = name.substr(start, end - start);
		if (name.find("struct", 0) == 0)
			name.replace(0, 6, "", 0);
		if (name.find("class", 0) == 0)
			name.replace(0, 5, "", 0);
		while (!name.empty() && isblank(name.front()))
			name.erase(name.begin());
		while (!name.empty() && isblank(name.back()))
			name.pop_back();

		for (std::size_t r = 0; r < removals.size(); ++r) {
			auto found = name.find(removals[r]);
			while (found != std::string::npos) {
				name.erase(found, removals[r].size());
				found = name.find(removals[r]);
			}
		}

		return name;
	}

	template <typename T>
	std::string ctti_get_type_name() {
		return ctti_get_type_name_from_sig(__FUNCSIG__);
	}
#else
#error Compiler not supported for demangling
#endif // compilers

	template <typename T>
	std::string demangle_once() {
		std::string realname = ctti_get_type_name<T>();
		return realname;
	}

	inline std::string short_demangle_from_type_name(std::string realname) {
		// This isn't the most complete but it'll do for now...?
		static const std::array<std::string, 10> ops = {
			{ "operator<", "operator<<", "operator<<=", "operator<=", "operator>", "operator>>", "operator>>=", "operator>=", "operator->", "operator->*" }
		};
		int level = 0;
		std::size_t idx = 0;
		for (idx = static_cast<std::size_t>(realname.empty() ? 0 : realname.size() - 1); idx > 0; --idx) {
			if (level == 0 && realname[idx] == ':') {
				break;
			}
			bool isleft = realname[idx] == '<';
			bool isright = realname[idx] == '>';
			if (!isleft && !isright)
				continue;
			bool earlybreak = false;
			for (const auto& op : ops) {
				std::size_t nisop = realname.rfind(op, idx);
				if (nisop == std::string::npos)
					continue;
				std::size_t nisopidx = idx - op.size() + 1;
				if (nisop == nisopidx) {
					idx = static_cast<std::size_t>(nisopidx);
					earlybreak = true;
				}
				break;
			}
			if (earlybreak) {
				continue;
			}
			level += isleft ? -1 : 1;
		}
		if (idx > 0) {
			realname.erase(0, realname.length() < static_cast<std::size_t>(idx) ? realname.length() : idx + 1);
		}
		return realname;
	}

	template <typename T>
	std::string short_demangle_once() {
		std::string realname = ctti_get_type_name<T>();
		return short_demangle_from_type_name(realname);
	}

	template <typename T>
	const std::string& demangle() {
		static const std::string d = demangle_once<T>();
		return d;
	}

	template <typename T>
	const std::string& short_demangle() {
		static const std::string d = short_demangle_once<T>();
		return d;
	}
}} // namespace sol::detail

#endif // SOL_DEMANGLE_HPP