Example #1
0
File: lgo.go Project: reusee/lgo
func (lua *Lua) toGoValue(i C.int, paramType reflect.Type) (ret reflect.Value) {
	luaType := C.lua_type(lua.State, i)
	paramKind := paramType.Kind()
	switch paramKind {
	case reflect.Bool:
		if luaType != C.LUA_TBOOLEAN {
			lua.Panic("not a boolean")
		}
		ret = reflect.ValueOf(C.lua_toboolean(lua.State, i) == C.int(1))
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		if luaType != C.LUA_TNUMBER {
			lua.Panic("not an integer")
		}
		ret = reflect.New(paramType).Elem()
		ret.SetInt(int64(C.lua_tointegerx(lua.State, i, nil)))
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		if luaType != C.LUA_TNUMBER {
			lua.Panic("not an unsigned")
		}
		ret = reflect.New(paramType).Elem()
		ret.SetUint(uint64(C.lua_tointegerx(lua.State, i, nil)))
	case reflect.Float32, reflect.Float64:
		if luaType != C.LUA_TNUMBER {
			lua.Panic("not a float")
		}
		ret = reflect.New(paramType).Elem()
		ret.SetFloat(float64(C.lua_tonumberx(lua.State, i, nil)))
	case reflect.Interface:
		switch luaType {
		case C.LUA_TNUMBER:
			ret = reflect.New(floatType).Elem()
			ret.SetFloat(float64(C.lua_tonumberx(lua.State, i, nil)))
		case C.LUA_TSTRING:
			ret = reflect.New(stringType).Elem()
			ret.SetString(C.GoString(C.lua_tolstring(lua.State, i, nil)))
		case C.LUA_TLIGHTUSERDATA:
			ret = reflect.ValueOf(C.lua_topointer(lua.State, i))
		case C.LUA_TBOOLEAN:
			ret = reflect.New(boolType).Elem()
			ret.SetBool(C.lua_toboolean(lua.State, i) == C.int(1))
		//TODO nil
		//TODO table
		default:
			lua.Panic("wrong interface argument: %v", paramKind)
		}
	case reflect.String:
		if luaType != C.LUA_TSTRING {
			lua.Panic("not a string")
		}
		ret = reflect.New(paramType).Elem()
		ret.SetString(C.GoString(C.lua_tolstring(lua.State, i, nil)))
	case reflect.Slice:
		switch luaType {
		case C.LUA_TSTRING:
			ret = reflect.New(paramType).Elem()
			cstr := C.lua_tolstring(lua.State, i, nil)
			ret.SetBytes(C.GoBytes(unsafe.Pointer(cstr), C.int(C.strlen(cstr))))
		case C.LUA_TTABLE:
			ret = reflect.MakeSlice(paramType, 0, 0)
			C.lua_pushnil(lua.State)
			elemType := paramType.Elem()
			for C.lua_next(lua.State, i) != 0 {
				ret = reflect.Append(ret, lua.toGoValue(-1, elemType))
				C.lua_settop(lua.State, -2)
			}
		default:
			lua.Panic("wrong slice argument")
		}
	case reflect.Ptr:
		if luaType != C.LUA_TLIGHTUSERDATA {
			lua.Panic("not a pointer")
		}
		pointer := C.lua_topointer(lua.State, i)
		ret = reflect.NewAt(paramType, unsafe.Pointer(&pointer)).Elem()
	case reflect.Map:
		if luaType != C.LUA_TTABLE {
			lua.Panic("not a map")
		}
		ret = reflect.MakeMap(paramType)
		C.lua_pushnil(lua.State)
		keyType := paramType.Key()
		elemType := paramType.Elem()
		for C.lua_next(lua.State, i) != 0 {
			ret.SetMapIndex(
				lua.toGoValue(-2, keyType),
				lua.toGoValue(-1, elemType))
			C.lua_settop(lua.State, -2)
		}
	case reflect.UnsafePointer:
		ret = reflect.ValueOf(C.lua_topointer(lua.State, i))
	//TODO complex64/128
	//TODO array
	//TODO chan
	//TODO func
	//TODO struct
	default:
		lua.Panic("unknown argument type %v", paramType)
	}
	return
}
Example #2
0
// Converts the Lua value at the given valid index to a Go int. The Lua
// value must be a number or a string convertible to a number; otherwise,
// Tointeger returns 0.
//
// If the number is not an integer, it is truncated in some non-specified
// way.
func (this *State) Tointeger(index int) int {
	return int(C.lua_tointegerx(this.luastate, C.int(index), nil))
}