mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
403 lines
11 KiB
C++
403 lines
11 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013-2016 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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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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// 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, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_STACK_GET_HPP
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#define SOL_STACK_GET_HPP
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#include "stack_core.hpp"
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#include "usertype_traits.hpp"
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#include "inheritance.hpp"
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#include "overload.hpp"
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#include "error.hpp"
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#include <memory>
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#include <functional>
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#include <utility>
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namespace sol {
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namespace stack {
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template<typename T, typename>
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struct getter {
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static T& get(lua_State* L, int index, record& tracking) {
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return getter<T&>{}.get(L, index, tracking);
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}
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};
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template<typename T>
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struct getter<T, std::enable_if_t<std::is_floating_point<T>::value>> {
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static T get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return static_cast<T>(lua_tonumber(L, index));
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}
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};
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template<typename T>
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struct getter<T, std::enable_if_t<meta::all<std::is_integral<T>, std::is_signed<T>>::value>> {
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static T get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return static_cast<T>(lua_tointeger(L, index));
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}
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};
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template<typename T>
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struct getter<T, std::enable_if_t<meta::all<std::is_integral<T>, std::is_unsigned<T>>::value>> {
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static T get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return static_cast<T>(lua_tointeger(L, index));
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}
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};
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template<typename T>
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struct getter<T, std::enable_if_t<std::is_enum<T>::value>> {
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static T get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return static_cast<T>(lua_tointegerx(L, index, nullptr));
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}
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};
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template<typename T>
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struct getter<T, std::enable_if_t<std::is_base_of<reference, T>::value || std::is_base_of<stack_reference, T>::value>> {
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static T get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return T(L, index);
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}
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};
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template<>
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struct getter<userdata_value> {
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static userdata_value get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return userdata_value(lua_touserdata(L, index));
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}
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};
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template<>
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struct getter<lightuserdata_value> {
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static lightuserdata_value get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return lightuserdata_value(lua_touserdata(L, index));
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}
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};
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template<typename T>
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struct getter<light<T>> {
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static light<T> get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return light<T>(static_cast<T*>(lua_touserdata(L, index)));
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}
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};
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template<typename T>
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struct getter<user<T>> {
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static T& get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return *static_cast<T*>(lua_touserdata(L, index));
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}
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};
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template<typename T>
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struct getter<user<T*>> {
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static T* get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return static_cast<T*>(lua_touserdata(L, index));
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}
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};
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template<>
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struct getter<type> {
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static type get(lua_State *L, int index, record& tracking) {
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tracking.use(1);
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return static_cast<type>(lua_type(L, index));
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}
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};
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template<>
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struct getter<bool> {
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static bool get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return lua_toboolean(L, index) != 0;
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}
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};
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template<>
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struct getter<std::string> {
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static std::string get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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std::size_t len;
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auto str = lua_tolstring(L, index, &len);
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return{ str, len };
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}
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};
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template <>
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struct getter<string_detail::string_shim> {
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string_detail::string_shim get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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size_t len;
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const char* p = lua_tolstring(L, index, &len);
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return string_detail::string_shim(p, len);
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}
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};
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template<>
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struct getter<const char*> {
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static const char* get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return lua_tostring(L, index);
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}
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};
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template<>
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struct getter<meta_function> {
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static meta_function get(lua_State *L, int index, record& tracking) {
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tracking.use(1);
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const char* name = getter<const char*>{}.get(L, index, tracking);
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for (std::size_t i = 0; i < meta_function_names.size(); ++i)
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if (meta_function_names[i] == name)
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return static_cast<meta_function>(i);
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return meta_function::construct;
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}
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};
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template<>
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struct getter<char> {
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static char get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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size_t len;
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auto str = lua_tolstring(L, index, &len);
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return len > 0 ? str[0] : '\0';
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}
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};
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#if 0
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template<>
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struct getter<std::wstring> {
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static std::wstring get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return{};
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}
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};
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template<>
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struct getter<std::u16string> {
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static std::u16string get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return{};
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}
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};
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template<>
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struct getter<std::u32string> {
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static std::u32string get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return{};
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}
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};
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template<>
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struct getter<wchar_t> {
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static wchar_t get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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auto str = getter<std::wstring>{}.get(L, index);
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return str.size() > 0 ? str[0] : '\0';
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}
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};
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template<>
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struct getter<char16_t> {
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static char get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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auto str = getter<std::u16string>{}.get(L, index);
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return str.size() > 0 ? str[0] : '\0';
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}
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};
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template<>
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struct getter<char32_t> {
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static char32_t get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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auto str = getter<std::u32string>{}.get(L, index);
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return str.size() > 0 ? str[0] : '\0';
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}
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};
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#endif // For a distant future
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template<>
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struct getter<nil_t> {
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static nil_t get(lua_State*, int, record& tracking) {
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tracking.use(1);
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return nil;
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}
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};
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template<>
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struct getter<std::nullptr_t> {
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static std::nullptr_t get(lua_State*, int, record& tracking) {
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tracking.use(1);
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return nullptr;
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}
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};
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template<>
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struct getter<nullopt_t> {
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static nullopt_t get(lua_State*, int, record& tracking) {
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tracking.use(1);
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return nullopt;
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}
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};
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template<>
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struct getter<this_state> {
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static this_state get(lua_State* L, int, record& tracking) {
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tracking.use(0);
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return this_state{ L };
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}
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};
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template<>
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struct getter<lua_CFunction> {
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static lua_CFunction get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return lua_tocfunction(L, index);
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}
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};
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template<>
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struct getter<c_closure> {
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static c_closure get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return c_closure(lua_tocfunction(L, index), -1);
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}
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};
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template<>
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struct getter<error> {
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static error get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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size_t sz = 0;
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const char* err = lua_tolstring(L, index, &sz);
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if (err == nullptr) {
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return error(detail::direct_error, "");
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}
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return error(detail::direct_error, std::string(err, sz));
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}
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};
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template<>
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struct getter<void*> {
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static void* get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return lua_touserdata(L, index);
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}
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};
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template<typename T>
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struct getter<T*> {
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static T* get_no_nil(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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void** pudata = static_cast<void**>(lua_touserdata(L, index));
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void* udata = *pudata;
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return get_no_nil_from(L, udata, index, tracking);
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}
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static T* get_no_nil_from(lua_State* L, void* udata, int index, record&) {
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if (detail::has_derived<T>::value && luaL_getmetafield(L, index, &detail::base_class_cast_key()[0]) != 0) {
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void* basecastdata = lua_touserdata(L, -1);
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detail::inheritance_cast_function ic = (detail::inheritance_cast_function)basecastdata;
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// use the casting function to properly adjust the pointer for the desired T
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udata = ic(udata, detail::id_for<T>::value);
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lua_pop(L, 1);
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}
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T* obj = static_cast<T*>(udata);
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return obj;
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}
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static T* get(lua_State* L, int index, record& tracking) {
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type t = type_of(L, index);
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if (t == type::nil) {
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tracking.use(1);
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return nullptr;
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}
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return get_no_nil(L, index, tracking);
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}
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};
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template<typename T>
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struct getter<non_null<T*>> {
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static T* get(lua_State* L, int index, record& tracking) {
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return getter<T*>::get_no_nil(L, index, tracking);
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}
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};
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template<typename T>
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struct getter<T&> {
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static T& get(lua_State* L, int index, record& tracking) {
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return *getter<T*>::get_no_nil(L, index, tracking);
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}
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};
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template<typename T>
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struct getter<T, std::enable_if_t<is_unique_usertype<T>::value>> {
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typedef typename unique_usertype_traits<T>::type P;
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typedef typename unique_usertype_traits<T>::actual_type Real;
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static Real& get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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P** pref = static_cast<P**>(lua_touserdata(L, index));
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detail::special_destruct_func* fx = static_cast<detail::special_destruct_func*>(static_cast<void*>(pref + 1));
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Real* mem = static_cast<Real*>(static_cast<void*>(fx + 1));
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return *mem;
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}
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};
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template<typename T>
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struct getter<std::reference_wrapper<T>> {
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static T& get(lua_State* L, int index, record& tracking) {
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return getter<T&>{}.get(L, index, tracking);
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}
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};
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template<typename... Args>
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struct getter<std::tuple<Args...>> {
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template <std::size_t... I>
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static decltype(auto) apply(std::index_sequence<I...>, lua_State* L, int index, record& tracking) {
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return std::tuple<decltype(stack::get<Args>(L, index))...>{stack::get<Args>(L, index + tracking.used, tracking)...};
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}
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static decltype(auto) get(lua_State* L, int index, record& tracking) {
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return apply(std::make_index_sequence<sizeof...(Args)>(), L, index, tracking);
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}
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};
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template<typename A, typename B>
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struct getter<std::pair<A, B>> {
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static decltype(auto) get(lua_State* L, int index, record& tracking) {
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return std::pair<decltype(stack::get<A>(L, index)), decltype(stack::get<B>(L, index))>{stack::get<A>(L, index, tracking), stack::get<B>(L, index + tracking.used, tracking)};
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}
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};
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} // stack
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} // sol
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#endif // SOL_STACK_GET_HPP
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