private ObjectCast genCaster(Type type)
{
ObjectCast fixTypeGetter = (RealStatePtr L, int idx, object target) =>
{
if (LuaAPI.lua_type(L, idx) == LuaTypes.LUA_TUSERDATA)
{
object obj = translator.SafeGetCSObj(L, idx);
return((obj != null && type.IsAssignableFrom(obj.GetType())) ? obj : null);
}
return(null);
};
if (typeof(Delegate).IsAssignableFrom(type))
{
return((RealStatePtr L, int idx, object target) =>
{
object obj = fixTypeGetter(L, idx, target);
if (obj != null)
{
return obj;
}
if (!LuaAPI.lua_isfunction(L, idx))
{
return null;
}
return translator.CreateDelegateBridge(L, type, idx);
});
}
else if (type.IsInterface)
{
return((RealStatePtr L, int idx, object target) =>
{
object obj = fixTypeGetter(L, idx, target);
if (obj != null)
{
return obj;
}
if (!LuaAPI.lua_istable(L, idx))
{
return null;
}
return translator.CreateInterfaceBridge(L, type, idx);
});
}
else if (type.IsEnum)
{
return((RealStatePtr L, int idx, object target) =>
{
object obj = fixTypeGetter(L, idx, target);
if (obj != null)
{
return obj;
}
LuaTypes lua_type = LuaAPI.lua_type(L, idx);
if (lua_type == LuaTypes.LUA_TSTRING)
{
return Enum.Parse(type, LuaAPI.lua_tostring(L, idx));
}
else if (lua_type == LuaTypes.LUA_TNUMBER)
{
return Enum.ToObject(type, LuaAPI.xlua_tointeger(L, idx));
}
throw new InvalidCastException("invalid value for enum " + type);
});
}
else if (type.IsArray)
{
return((RealStatePtr L, int idx, object target) =>
{
object obj = fixTypeGetter(L, idx, target);
if (obj != null)
{
return obj;
}
if (!LuaAPI.lua_istable(L, idx))
{
return null;
}
uint len = LuaAPI.xlua_objlen(L, idx);
int n = LuaAPI.lua_gettop(L);
idx = idx > 0 ? idx : LuaAPI.lua_gettop(L) + idx + 1;// abs of index
Type et = type.GetElementType();
ObjectCast elementCaster = GetCaster(et);
Array ary = target == null?Array.CreateInstance(et, len) : target as Array;
if (!LuaAPI.lua_checkstack(L, 1))
{
throw new Exception("stack overflow while cast to Array");
}
for (int i = 0; i < len; ++i)
{
LuaAPI.lua_pushnumber(L, i + 1);
LuaAPI.lua_rawget(L, idx);
if (et.IsPrimitive)
{
if (!StaticLuaCallbacks.TryPrimitiveArraySet(type, L, ary, i, n + 1))
{
ary.SetValue(elementCaster(L, n + 1, null), i);
}
}
else
{
if (StaticLuaCallbacks.GenTryArraySetPtr == null ||
!StaticLuaCallbacks.GenTryArraySetPtr(type, L, translator, ary, i, n + 1))
{
ary.SetValue(elementCaster(L, n + 1, null), i);
}
}
LuaAPI.lua_pop(L, 1);
}
return ary;
});
}
else if (typeof(IList).IsAssignableFrom(type) && type.IsGenericType)
{
ObjectCast elementCaster = GetCaster(type.GetGenericArguments()[0]);
return((RealStatePtr L, int idx, object target) =>
{
object obj = fixTypeGetter(L, idx, target);
if (obj != null)
{
return obj;
}
if (!LuaAPI.lua_istable(L, idx))
{
return null;
}
obj = target == null?Activator.CreateInstance(type) : target;
int n = LuaAPI.lua_gettop(L);
idx = idx > 0 ? idx : LuaAPI.lua_gettop(L) + idx + 1;// abs of index
IList list = obj as IList;
uint len = LuaAPI.xlua_objlen(L, n);
if (!LuaAPI.lua_checkstack(L, 1))
{
throw new Exception("stack overflow while cast to IList");
}
for (int i = 0; i < len; ++i)
{
LuaAPI.lua_pushnumber(L, i + 1);
LuaAPI.lua_rawget(L, idx);
if (i < list.Count && target != null)
{
var item = elementCaster(L, n + 1, list[i]);
if (item != null)
{
list[i] = item;
}
}
else
{
var item = elementCaster(L, n + 1, null);
if (item != null)
{
list.Add(item);
}
}
LuaAPI.lua_pop(L, 1);
}
return obj;
});
}
else if (typeof(IDictionary).IsAssignableFrom(type) && type.IsGenericType)
{
ObjectCast keyCaster = GetCaster(type.GetGenericArguments()[0]);
ObjectCast valueCaster = GetCaster(type.GetGenericArguments()[1]);
return((RealStatePtr L, int idx, object target) =>
{
object obj = fixTypeGetter(L, idx, target);
if (obj != null)
{
return obj;
}
if (!LuaAPI.lua_istable(L, idx))
{
return null;
}
IDictionary dic = (target == null ? Activator.CreateInstance(type) : target) as IDictionary;
int n = LuaAPI.lua_gettop(L);
idx = idx > 0 ? idx : LuaAPI.lua_gettop(L) + idx + 1;// abs of index
LuaAPI.lua_pushnil(L);
if (!LuaAPI.lua_checkstack(L, 1))
{
throw new Exception("stack overflow while cast to IDictionary");
}
while (LuaAPI.lua_next(L, idx) != 0)
{
object k = keyCaster(L, n + 1, null); // -2:key
if (k != null)
{
object v = valueCaster(L, n + 2, !dic.Contains(k) ? null : dic[k]);
if (v != null)
{
dic[k] = v; // -1:value
}
}
LuaAPI.lua_pop(L, 1); // removes value, keeps key for next iteration
}
return dic;
});
}
else if ((type.IsClass && type.GetConstructor(System.Type.EmptyTypes) != null) || (type.IsValueType && !type.IsEnum)) //class has default construtor
{
return((RealStatePtr L, int idx, object target) =>
{
object obj = fixTypeGetter(L, idx, target);
if (obj != null)
{
return obj;
}
if (!LuaAPI.lua_istable(L, idx))
{
return null;
}
obj = target == null?Activator.CreateInstance(type) : target;
int n = LuaAPI.lua_gettop(L);
idx = idx > 0 ? idx : LuaAPI.lua_gettop(L) + idx + 1;// abs of index
if (!LuaAPI.lua_checkstack(L, 1))
{
throw new Exception("stack overflow while cast to " + type);
}
/*foreach (PropertyInfo prop in type.GetProperties())
* {
* LuaAPI.xlua_pushasciistring(L, prop.Name);
* LuaAPI.lua_rawget(L, idx);
* if (!LuaAPI.lua_isnil(L, -1))
* {
* try
* {
* prop.SetValue(obj, GetCaster(prop.PropertyType)(L, n + 1,
* target == null || prop.PropertyType.IsPrimitive || prop.PropertyType == typeof(string) ? null : prop.GetValue(obj, null)), null);
* }
* catch (Exception e)
* {
* throw new Exception("exception in tran " + prop.Name + ", msg=" + e.Message);
* }
* }
* LuaAPI.lua_pop(L, 1);
* }*/
foreach (FieldInfo field in type.GetFields())
{
LuaAPI.xlua_pushasciistring(L, field.Name);
LuaAPI.lua_rawget(L, idx);
if (!LuaAPI.lua_isnil(L, -1))
{
try
{
field.SetValue(obj, GetCaster(field.FieldType)(L, n + 1,
target == null || field.FieldType.IsPrimitive || field.FieldType == typeof(string) ? null : field.GetValue(obj)));
}
catch (Exception e)
{
throw new Exception("exception in tran " + field.Name + ", msg=" + e.Message);
}
}
LuaAPI.lua_pop(L, 1);
}
return obj;
});
}
else
{
return(fixTypeGetter);
}
}