Example #1
0
File: lua.go Project: szll/golua
// lua_touserdata
func (L *State) ToUserdata(index int) unsafe.Pointer {
	return unsafe.Pointer(C.lua_touserdata(L.s, C.int(index)))
}
Example #2
0
// If the value at the given valid index is a full userdata, returns
// its block address. If the value is a light userdata, returns its
// pointer. Otherwise, returns unsafe.Pointer(nil).
func (s *State) Touserdata(index int) unsafe.Pointer {
	return C.lua_touserdata(s.l, C.int(index))
}
Example #3
0
// If the value at the given valid index is a full userdata, returns
// its block address. If the value is a light userdata, returns its
// pointer. Otherwise, returns unsafe.Pointer(nil).
func (this *State) Touserdata(index int) unsafe.Pointer {
	return C.lua_touserdata(this.luastate, C.int(index))
}
Example #4
0
File: lua.go Project: reusee/lua
func (l *Lua) toGoValue(i C.int, paramType reflect.Type) (ret *reflect.Value, err error) {
	luaType := C.lua_type(l.State, i)
	paramKind := paramType.Kind()
	switch paramKind {
	case reflect.Bool:
		if luaType != C.LUA_TBOOLEAN {
			err = fmt.Errorf("not a boolean")
			return
		}
		v := reflect.ValueOf(C.lua_toboolean(l.State, i) == C.int(1))
		ret = &v
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		if luaType != C.LUA_TNUMBER {
			err = fmt.Errorf("not an integer")
			return
		}
		v := reflect.New(paramType).Elem()
		v.SetInt(int64(C.lua_tointeger(l.State, i)))
		ret = &v
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		if luaType != C.LUA_TNUMBER {
			err = fmt.Errorf("not a unsigned")
			return
		}
		v := reflect.New(paramType).Elem()
		v.SetUint(uint64(C.lua_tointeger(l.State, i)))
		ret = &v
	case reflect.Float32, reflect.Float64:
		if luaType != C.LUA_TNUMBER {
			err = fmt.Errorf("not a float")
			return
		}
		v := reflect.New(paramType).Elem()
		v.SetFloat(float64(C.lua_tonumber(l.State, i)))
		ret = &v
	case reflect.Interface:
		switch paramType {
		case interfaceType:
			switch luaType {
			case C.LUA_TNUMBER:
				v := reflect.New(floatType).Elem() // always return float64 for interface{}
				v.SetFloat(float64(C.lua_tonumber(l.State, i)))
				ret = &v
			case C.LUA_TSTRING:
				v := reflect.New(stringType).Elem()
				v.SetString(C.GoString(C.lua_tolstring(l.State, i, nil)))
				ret = &v
			case C.LUA_TLIGHTUSERDATA, C.LUA_TUSERDATA:
				v := reflect.ValueOf(C.lua_touserdata(l.State, i))
				ret = &v
			case C.LUA_TBOOLEAN:
				v := reflect.New(boolType).Elem()
				v.SetBool(C.lua_toboolean(l.State, i) == C.int(1))
				ret = &v
			case C.LUA_TNIL:
				ret = nil
			default:
				err = fmt.Errorf("unsupported type %s for interface{}", luaTypeName(luaType))
				return
			}
		default:
			err = fmt.Errorf("only interface{} is supported, no %v", paramType)
			return
		}
	case reflect.String:
		if luaType != C.LUA_TSTRING {
			err = fmt.Errorf("not a string")
			return
		}
		v := reflect.New(paramType).Elem()
		v.SetString(C.GoString(C.lua_tolstring(l.State, i, nil)))
		ret = &v
	case reflect.Slice:
		switch luaType {
		case C.LUA_TSTRING:
			v := reflect.New(paramType).Elem()
			cstr := C.lua_tolstring(l.State, i, nil)
			v.SetBytes(C.GoBytes(unsafe.Pointer(cstr), C.int(C.strlen(cstr))))
			ret = &v
		case C.LUA_TTABLE:
			v := reflect.MakeSlice(paramType, 0, 0)
			C.lua_pushnil(l.State)
			elemType := paramType.Elem()
			for C.lua_next(l.State, i) != 0 {
				elemValue, e := l.toGoValue(-1, elemType)
				if e != nil {
					err = e
					return
				}
				// there is no nil value in lua table so elemValue will never be nil
				v = reflect.Append(v, *elemValue)
				C.lua_settop(l.State, -2)
				ret = &v
			}
		default:
			err = fmt.Errorf("wrong slice argument")
			return
		}
	case reflect.Ptr:
		if luaType != C.LUA_TLIGHTUSERDATA {
			err = fmt.Errorf("not a pointer")
			return
		}
		p := C.lua_topointer(l.State, i)
		v := reflect.NewAt(paramType, unsafe.Pointer(&p)).Elem()
		ret = &v
	case reflect.Map:
		if luaType != C.LUA_TTABLE {
			err = fmt.Errorf("not a map")
			return
		}
		v := reflect.MakeMap(paramType)
		C.lua_pushnil(l.State)
		keyType := paramType.Key()
		elemType := paramType.Elem()
		for C.lua_next(l.State, i) != 0 {
			keyValue, e := l.toGoValue(-2, keyType)
			if e != nil {
				err = e
				return
			}
			// table has no nil key so keyValue will not be nil
			elemValue, e := l.toGoValue(-1, elemType)
			if e != nil {
				err = e
				return
			}
			// table has no nil value so elemValue will not be nil
			v.SetMapIndex(*keyValue, *elemValue)
			C.lua_settop(l.State, -2)
		}
		ret = &v
	case reflect.UnsafePointer:
		v := reflect.ValueOf(C.lua_topointer(l.State, i))
		ret = &v
	default:
		err = fmt.Errorf("unsupported toGoValue type %v", paramType)
		return
	}
	return
}