mirror of
https://github.com/vcmi/vcmi.git
synced 2024-12-26 22:57:00 +02:00
369 lines
7.4 KiB
C++
369 lines
7.4 KiB
C++
/*
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* LuaStack.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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#include "api/Registry.h"
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#include "../../lib/GameConstants.h"
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VCMI_LIB_NAMESPACE_BEGIN
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class JsonNode;
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class int3;
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namespace scripting
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{
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namespace detail
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{
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template<typename T>
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struct IsRegularClass
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{
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static constexpr auto value = std::is_class<T>::value && !std::is_base_of<IdTag, T>::value;
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};
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template<typename T>
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struct IsIdClass
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{
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static constexpr auto value = std::is_class<T>::value && std::is_base_of<IdTag, T>::value;
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};
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}
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class LuaStack
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{
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public:
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LuaStack(lua_State * L_);
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void balance();
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void clear();
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void pushByIndex(lua_Integer index);
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void pushNil();
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void pushInteger(lua_Integer value);
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void push(bool value);
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void push(const char * value);
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void push(const std::string & value);
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void push(const JsonNode & value);
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template<typename T>
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void push(const boost::optional<T> & value)
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{
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if(value.is_initialized())
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push(value.get());
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else
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pushNil();
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}
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template<typename T, typename std::enable_if< std::is_integral<T>::value && !std::is_same<T, bool>::value, int>::type = 0>
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void push(const T value)
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{
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pushInteger(static_cast<lua_Integer>(value));
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}
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template<typename T, typename std::enable_if< std::is_enum<T>::value, int>::type = 0>
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void push(const T value)
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{
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pushInteger(static_cast<lua_Integer>(value));
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}
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void push(const int3 & value);
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template<typename T, typename std::enable_if< detail::IsIdClass<T>::value, int>::type = 0>
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void push(const T & value)
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{
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pushInteger(static_cast<lua_Integer>(value.toEnum()));
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}
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template<typename T, typename std::enable_if<detail::IsRegularClass<T>::value, int>::type = 0>
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void push(T * value)
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{
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using UData = T *;
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static auto KEY = api::TypeRegistry::get()->getKey<UData>();
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if(!value)
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{
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pushNil();
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return;
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}
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void * raw = lua_newuserdata(L, sizeof(UData));
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if(!raw)
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{
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pushNil();
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return;
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}
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UData * ptr = static_cast<UData *>(raw);
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*ptr = value;
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luaL_getmetatable(L, KEY);
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lua_setmetatable(L, -2);
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}
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template<typename T, typename std::enable_if<detail::IsRegularClass<T>::value, int>::type = 0>
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void push(std::shared_ptr<T> value)
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{
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using UData = std::shared_ptr<T>;
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static auto KEY = api::TypeRegistry::get()->getKey<UData>();
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if(!value)
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{
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pushNil();
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return;
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}
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void * raw = lua_newuserdata(L, sizeof(UData));
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if(!raw)
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{
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pushNil();
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return;
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}
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new(raw) UData(value);
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luaL_getmetatable(L, KEY);
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lua_setmetatable(L, -2);
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}
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template<typename T, typename std::enable_if<detail::IsRegularClass<T>::value, int>::type = 0>
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void push(std::unique_ptr<T> && value)
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{
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using UData = std::unique_ptr<T>;
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static auto KEY = api::TypeRegistry::get()->getKey<UData>();
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if(!value)
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{
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pushNil();
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return;
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}
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void * raw = lua_newuserdata(L, sizeof(UData));
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if(!raw)
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{
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pushNil();
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return;
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}
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new(raw) UData(std::move(value));
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luaL_getmetatable(L, KEY);
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lua_setmetatable(L, -2);
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}
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bool tryGetInteger(int position, lua_Integer & value);
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bool tryGet(int position, bool & value);
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template<typename T, typename std::enable_if< std::is_integral<T>::value && !std::is_same<T, bool>::value, int>::type = 0>
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bool tryGet(int position, T & value)
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{
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lua_Integer temp;
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if(tryGetInteger(position, temp))
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{
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value = static_cast<T>(temp);
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return true;
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}
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else
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{
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return false;
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}
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}
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template<typename T, typename std::enable_if<detail::IsIdClass<T>::value, int>::type = 0>
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bool tryGet(int position, T & value)
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{
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lua_Integer temp;
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if(tryGetInteger(position, temp))
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{
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value = T(temp);
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return true;
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}
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else
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{
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return false;
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}
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}
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template<typename T, typename std::enable_if< std::is_enum<T>::value, int>::type = 0>
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bool tryGet(int position, T & value)
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{
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lua_Integer temp;
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if(tryGetInteger(position, temp))
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{
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value = static_cast<T>(temp);
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return true;
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}
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else
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{
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return false;
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}
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}
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bool tryGet(int position, int3 & value);
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bool tryGet(int position, double & value);
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bool tryGet(int position, std::string & value);
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template<typename T, typename std::enable_if<detail::IsRegularClass<T>::value && std::is_const<T>::value, int>::type = 0>
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STRONG_INLINE bool tryGet(int position, T * & value)
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{
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using NCValue = typename std::remove_const<T>::type;
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using UData = NCValue *;
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using CUData = T *;
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return tryGetCUData<T *, UData, CUData>(position, value);
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}
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template<typename T, typename std::enable_if<detail::IsRegularClass<T>::value && !std::is_const<T>::value, int>::type = 0>
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STRONG_INLINE bool tryGet(int position, T * & value)
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{
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return tryGetUData<T *>(position, value);
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}
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template<typename T, typename std::enable_if<detail::IsRegularClass<T>::value && std::is_const<T>::value, int>::type = 0>
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STRONG_INLINE bool tryGet(int position, std::shared_ptr<T> & value)
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{
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using NCValue = typename std::remove_const<T>::type;
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using UData = std::shared_ptr<NCValue>;
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using CUData = std::shared_ptr<T>;
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return tryGetCUData<std::shared_ptr<T>, UData, CUData>(position, value);
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}
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template<typename T, typename std::enable_if<detail::IsRegularClass<T>::value && !std::is_const<T>::value, int>::type = 0>
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STRONG_INLINE bool tryGet(int position, std::shared_ptr<T> & value)
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{
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return tryGetUData<std::shared_ptr<T>>(position, value);
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}
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template<typename U>
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bool tryGetUData(int position, U & value)
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{
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static auto KEY = api::TypeRegistry::get()->getKey<U>();
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void * raw = lua_touserdata(L, position);
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if(!raw)
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return false;
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if(lua_getmetatable(L, position) == 0)
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return false;
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lua_getfield(L, LUA_REGISTRYINDEX, KEY);
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if(lua_rawequal(L, -1, -2) == 1)
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{
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value = *(static_cast<U *>(raw));
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lua_pop(L, 2);
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return true;
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}
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lua_pop(L, 2);
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return false;
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}
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template<typename T, typename U, typename CU>
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bool tryGetCUData(int position, T & value)
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{
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static auto KEY = api::TypeRegistry::get()->getKey<U>();
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static auto C_KEY = api::TypeRegistry::get()->getKey<CU>();
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void * raw = lua_touserdata(L, position);
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if(!raw)
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return false;
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if(lua_getmetatable(L, position) == 0)
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return false;
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//top is metatable
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lua_getfield(L, LUA_REGISTRYINDEX, KEY);
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if(lua_rawequal(L, -1, -2) == 1)
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{
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value = *(static_cast<U *>(raw));
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lua_pop(L, 2);
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return true;
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}
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lua_pop(L, 1);
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//top is metatable
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lua_getfield(L, LUA_REGISTRYINDEX, C_KEY);
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if(lua_rawequal(L, -1, -2) == 1)
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{
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value = *(static_cast<CU *>(raw));
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lua_pop(L, 2);
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return true;
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}
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lua_pop(L, 2);
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return false;
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}
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bool tryGet(int position, JsonNode & value);
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int retNil();
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int retVoid();
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STRONG_INLINE
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int retPushed()
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{
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return lua_gettop(L);
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}
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inline bool isFunction(int position)
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{
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return lua_isfunction(L, position);
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}
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inline bool isNumber(int position)
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{
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return lua_isnumber(L, position);
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}
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static int quickRetBool(lua_State * L, bool value)
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{
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lua_settop(L, 0);
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lua_pushboolean(L, value);
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return 1;
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}
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template<typename T>
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static int quickRetInt(lua_State * L, const T & value)
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{
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lua_settop(L, 0);
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lua_pushinteger(L, static_cast<int32_t>(value));
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return 1;
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}
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static int quickRetStr(lua_State * L, const std::string & value)
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{
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lua_settop(L, 0);
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lua_pushlstring(L, value.c_str(), value.size());
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return 1;
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}
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private:
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lua_State * L;
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int initialTop;
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};
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}
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VCMI_LIB_NAMESPACE_END
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