/*
* Pushes a new object into the Lua stack with the provided
* metatable
*/
private void pushNewObject(ILuaState luaState, object o, int index, string metatable)
{
if (metatable == "luaNet_metatable")
{
// Gets or creates the metatable for the object's type
LuaDLL.luaL_getmetatable(luaState, o.GetType().AssemblyQualifiedName);
if (LuaDLL.lua_isnil(luaState, -1))
{
LuaDLL.lua_settop(luaState, -2);
LuaDLL.luaL_newmetatable(luaState, o.GetType().AssemblyQualifiedName);
LuaDLL.lua_pushstring(luaState, "cache");
LuaDLL.lua_newtable(luaState);
LuaDLL.lua_rawset(luaState, -3);
LuaDLL.lua_pushlightuserdata(luaState, LuaDLL.luanet_gettag());
LuaDLL.lua_pushnumber(luaState, 1);
LuaDLL.lua_rawset(luaState, -3);
LuaDLL.lua_pushstring(luaState, "__index");
LuaDLL.lua_pushstring(luaState, "luaNet_indexfunction");
LuaDLL.lua_rawget(luaState, (int)LuaDef.LUA_REGISTRYINDEX);
LuaDLL.lua_rawset(luaState, -3);
LuaDLL.lua_pushstring(luaState, "__gc");
LuaDLL.lua_pushstdcallcfunction(luaState, metaFunctions.gcFunction);
LuaDLL.lua_rawset(luaState, -3);
LuaDLL.lua_pushstring(luaState, "__tostring");
LuaDLL.lua_pushstdcallcfunction(luaState, metaFunctions.toStringFunction);
LuaDLL.lua_rawset(luaState, -3);
LuaDLL.lua_pushstring(luaState, "__newindex");
LuaDLL.lua_pushstdcallcfunction(luaState, metaFunctions.newindexFunction);
LuaDLL.lua_rawset(luaState, -3);
}
}
else
{
LuaDLL.luaL_getmetatable(luaState, metatable);
}
// Stores the object index in the Lua list and pushes the
// index into the Lua stack
LuaDLL.luaL_getmetatable(luaState, "luaNet_objects");
LuaDLL.luanet_newudata(luaState, index);
LuaDLL.lua_pushvalue(luaState, -3);
LuaDLL.lua_remove(luaState, -4);
LuaDLL.lua_setmetatable(luaState, -2);
LuaDLL.lua_pushvalue(luaState, -1);
LuaDLL.lua_rawseti(luaState, -3, index);
LuaDLL.lua_remove(luaState, -2);
}
/*
* Pushes a CLR object into the Lua stack as an userdata
* with the provided metatable
*/
internal void pushObject(ILuaState luaState, object o, string metatable)
{
int index = -1;
// Pushes nil
if (o == null)
{
LuaDLL.lua_pushnil(luaState);
return;
}
// Object already in the list of Lua objects? Push the stored reference.
bool found = objectsBackMap.TryGetValue(o, out index);
if (found)
{
LuaDLL.luaL_getmetatable(luaState, "luaNet_objects");
LuaDLL.lua_rawgeti(luaState, -1, index);
// Note: starting with lua5.1 the garbage collector may remove weak reference items (such as our luaNet_objects values) when the initial GC sweep
// occurs, but the actual call of the __gc finalizer for that object may not happen until a little while later. During that window we might call
// this routine and find the element missing from luaNet_objects, but collectObject() has not yet been called. In that case, we go ahead and call collect
// object here
// did we find a non nil object in our table? if not, we need to call collect object
LuaType type = LuaDLL.lua_type(luaState, -1);
if (type != LuaType.LUA_TNIL)
{
LuaDLL.lua_remove(luaState, -2); // drop the metatable - we're going to leave our object on the stack
return;
}
// MetaFunctions.dumpStack(this, luaState);
LuaDLL.lua_remove(luaState, -1); // remove the nil object value
LuaDLL.lua_remove(luaState, -1); // remove the metatable
collectObject(o, index); // Remove from both our tables and fall out to get a new ID
}
index = addObject(o);
pushNewObject(luaState, o, index, metatable);
}
