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#ifndef _LUA_METATABLE_H_
#define _LUA_METATABLE_H_
#define LUA_TINTEGER LUA_NUMTAGS + 1
#define LUA_TSTRINGA LUA_NUMTAGS + 2
#define LUA_TSTRINGW LUA_NUMTAGS + 3
struct MTField
{
size_t offset;
size_t size;
int type;
MTField(size_t offset, size_t size, int type)
: offset(offset), size(size), type(type) { }
};
template<typename T>
class MT
{
private:
lua_State *L;
static const char *name;
static std::map<std::string, MTField*> fields;
template<typename R>
static R GetValue(const T *obj, size_t offset, size_t size)
{
R res = NULL;
memcpy(&res, ((char*)obj) + offset, size);
return res;
}
static void Init(lua_State *L, T **obj)
{
luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
T *udata = (T*)lua_touserdata(L, 1);
memcpy(*obj, udata, sizeof(T));
}
static void Free(T **obj)
{
*obj = NULL;
}
static int lua__new(lua_State *L)
{
T *udata = (T*)lua_newuserdata(L, sizeof(T));
memset(udata, 0, sizeof(T));
Init(L, &udata);
if (udata == NULL)
{
lua_pushnil(L);
return 1;
}
luaL_setmetatable(L, MT::name);
return 1;
}
static int lua__index(lua_State *L)
{
T *obj = (T*)luaL_checkudata(L, 1, MT::name);
const char *key = lua_tostring(L, 2);
auto it = fields.find(key);
if (it == fields.end())
{
lua_pushnil(L);
return 1;
}
MTField *field = it->second;
size_t offset = field->offset;
size_t size = field->size;
switch (field->type)
{
case LUA_TBOOLEAN:
lua_pushboolean(L, GetValue<bool>(obj, offset, size));
break;
case LUA_TINTEGER:
lua_pushinteger(L, GetValue<long long>(obj, offset, size));
break;
case LUA_TNUMBER:
lua_pushnumber(L, GetValue<double>(obj, offset, size));
break;
case LUA_TSTRING:
lua_pushstring(L, GetValue<char*>(obj, offset, size));
break;
case LUA_TSTRINGA:
lua_pushstring(L, ptrA(mir_utf8encode(GetValue<char*>(obj, offset, size))));
break;
case LUA_TSTRINGW:
lua_pushstring(L, ptrA(mir_utf8encodeW(GetValue<wchar_t*>(obj, offset, size))));
break;
case LUA_TLIGHTUSERDATA:
lua_pushlightuserdata(L, GetValue<void*>(obj, offset, size));
break;
default:
lua_pushnil(L);
}
return 1;
}
static int lua__gc(lua_State *L)
{
T *obj = (T*)luaL_checkudata(L, 1, MT::name);
MT::Free(&obj);
return 0;
}
public:
MT(lua_State *L, const char *tname) : L(L)
{
MT::name = tname;
lua_pushcfunction(L, lua__new);
lua_setglobal(L, MT::name);
luaL_newmetatable(L, MT::name);
lua_pushcfunction(L, lua__new);
lua_setfield(L, -2, "__call");
lua_pushcfunction(L, lua__index);
lua_setfield(L, -2, "__index");
lua_pushcfunction(L, lua__gc);
lua_setfield(L, -2, "__gc");
}
template<typename R>
MT& Field(R T::*M, const char *name, int type, size_t size = sizeof(R))
{
size_t offset = reinterpret_cast<size_t>(&(((T*)0)->*M));
if (type != LUA_TNONE)
fields[name] = new MTField(offset, size, type);
return *this;
}
MT& Method(lua_CFunction func, const char *name)
{
luaL_getmetatable(L, MT::name);
lua_pushcfunction(L, func);
lua_setfield(L, -2, name);
lua_pop(L, 1);
return *this;
}
static void Set(lua_State *L, T *obj)
{
if (obj == NULL)
{
lua_pushnil(L);
return;
}
T *udata = (T*)lua_newuserdata(L, sizeof(T));
memcpy(udata, obj, sizeof(T));
luaL_setmetatable(L, MT::name);
}
};
template<typename T>
const char *MT<T>::name;
template<typename T>
std::map<std::string, MTField*> MT<T>::fields;
#endif //_LUA_METATABLE_H_
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