Golang Value.SetUint方法代码示例

// setFieldVal first converts v to the type of structField, then uses reflection
// to set the field to the converted value.
func setFieldVal(structField reflect.Value, name string, v string) error {
	switch structField.Kind() {
	case reflect.String:
		structField.SetString(v)
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		vInt, err := strconv.Atoi(v)
		if err != nil {
			return fmt.Errorf("envvar: Error parsing environment variable %s: %s\n%s", name, v, err.Error())
		}
		structField.SetInt(int64(vInt))
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		vUint, err := strconv.ParseUint(v, 10, 64)
		if err != nil {
			return fmt.Errorf("envvar: Error parsing environment variable %s: %s\n%s", name, v, err.Error())
		}
		structField.SetUint(uint64(vUint))
	case reflect.Float32, reflect.Float64:
		vFloat, err := strconv.ParseFloat(v, 64)
		if err != nil {
			return fmt.Errorf("envvar: Error parsing environment variable %s: %s\n%s", name, v, err.Error())
		}
		structField.SetFloat(vFloat)
	case reflect.Bool:
		vBool, err := strconv.ParseBool(v)
		if err != nil {
			return fmt.Errorf("envvar: Error parsing environment variable %s: %s\n%s", name, v, err.Error())
		}
		structField.SetBool(vBool)
	default:
		return fmt.Errorf("envvar: Unsupported struct field type: %s", structField.Type().String())
	}
	return nil
}

func (d base) setModelValue(driverValue, fieldValue reflect.Value) error {
	switch fieldValue.Type().Kind() {
	case reflect.Bool:
		fieldValue.SetBool(d.dialect.parseBool(driverValue.Elem()))
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		fieldValue.SetInt(driverValue.Elem().Int())
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		// reading uint from int value causes panic
		switch driverValue.Elem().Kind() {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			fieldValue.SetUint(uint64(driverValue.Elem().Int()))
		default:
			fieldValue.SetUint(driverValue.Elem().Uint())
		}
	case reflect.Float32, reflect.Float64:
		fieldValue.SetFloat(driverValue.Elem().Float())
	case reflect.String:
		fieldValue.SetString(string(driverValue.Elem().Bytes()))
	case reflect.Slice:
		if reflect.TypeOf(driverValue.Interface()).Elem().Kind() == reflect.Uint8 {
			fieldValue.SetBytes(driverValue.Elem().Bytes())
		}
	case reflect.Struct:
		switch fieldValue.Interface().(type) {
		case time.Time:
			fieldValue.Set(driverValue.Elem())
		default:
			if scanner, ok := fieldValue.Addr().Interface().(sql.Scanner); ok {
				return scanner.Scan(driverValue.Interface())
			}
		}

	}
	return nil
}

func convertAssignInt(d reflect.Value, s int64) (err error) {
	switch d.Type().Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		d.SetInt(s)
		if d.Int() != s {
			err = strconv.ErrRange
			d.SetInt(0)
		}
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		if s < 0 {
			err = strconv.ErrRange
		} else {
			x := uint64(s)
			d.SetUint(x)
			if d.Uint() != x {
				err = strconv.ErrRange
				d.SetUint(0)
			}
		}
	case reflect.Bool:
		d.SetBool(s != 0)
	default:
		err = cannotConvert(d, s)
	}
	return
}

func (defaultMarshaler) Marshal(v reflect.Value, s string) error {
	if v.Kind() == reflect.Slice {
		n := reflect.New(v.Type().Elem())
		m := valueMarshaler(n.Elem())
		err := m.Marshal(n.Elem(), s)
		if err != nil {
			return err
		}
		v.Set(reflect.Append(v, n.Elem()))
		return nil
	}
	switch v.Kind() {
	case reflect.Int:
		x, err := strconv.ParseInt(s, 0, 0)
		v.SetInt(x)
		return err
	case reflect.Uint:
		x, err := strconv.ParseUint(s, 0, 0)
		v.SetUint(x)
		return err
	case reflect.Int64:
		x, err := strconv.ParseInt(s, 0, 64)
		v.SetInt(x)
		return err
	case reflect.String:
		v.SetString(s)
		return nil
	default:
		return fmt.Errorf("unhandled builtin type: %s", v.Type().String())
	}
}

func (d *base) SetModelValue(driverValue, fieldValue reflect.Value) error {
	// ignore zero types
	if !driverValue.Elem().IsValid() {
		return nil
	}
	switch fieldValue.Type().Kind() {
	case reflect.Bool:
		fieldValue.SetBool(d.Dialect.ParseBool(driverValue.Elem()))
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		fieldValue.SetInt(driverValue.Elem().Int())
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		// reading uint from int value causes panic
		switch driverValue.Elem().Kind() {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			fieldValue.SetUint(uint64(driverValue.Elem().Int()))
		default:
			fieldValue.SetUint(driverValue.Elem().Uint())
		}
	case reflect.Float32, reflect.Float64:
		fieldValue.SetFloat(driverValue.Elem().Float())
	case reflect.String:
		fieldValue.SetString(string(driverValue.Elem().Bytes()))
	case reflect.Slice:
		if reflect.TypeOf(driverValue.Interface()).Elem().Kind() == reflect.Uint8 {
			fieldValue.SetBytes(driverValue.Elem().Bytes())
		}
	case reflect.Struct:
		if _, ok := fieldValue.Interface().(time.Time); ok {
			fieldValue.Set(driverValue.Elem())
		}
	}
	return nil
}

func boolAsUintDecoder(dv, sv reflect.Value) {
	if sv.Bool() {
		dv.SetUint(1)
	} else {
		dv.SetUint(0)
	}
}

func (d *MySQL) ValueToField(value reflect.Value, field reflect.Value) error {
	switch field.Type().Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		field.SetInt(value.Elem().Int())
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		// reading uint from int value causes panic
		switch value.Elem().Kind() {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			field.SetUint(uint64(value.Elem().Int()))
		default:
			field.SetUint(value.Elem().Uint())
		}
	case reflect.Float32, reflect.Float64:
		field.SetFloat(value.Elem().Float())
	case reflect.String:
		if !value.Elem().IsValid() {
			field.SetString("")
			return nil
		}
		field.SetString(string(value.Elem().Bytes()))
	case reflect.Slice:
		if reflect.TypeOf(value.Interface()).Elem().Kind() == reflect.Uint8 {
			field.SetBytes(value.Elem().Bytes())
		}
	case reflect.Struct:
		if field.Type() == reflect.TypeOf(time.Time{}) {
			field.Set(value.Elem())
		}
	}
	return nil
}

// type(1) | name length(1) | raw name bytes | 0x00 | value bytes(8)
func (d *decodeState) uint64(v reflect.Value) {
	d.off += 1 // type

	klen := int(Int8(d.data[d.off:]))
	d.off += 1 // name length

	if klen > 0 {
		key := d.data[d.off : d.off+klen-1]
		d.off += klen
		v = fieldByTag(v, key)
		u, pv := d.indirect(v, false)
		if u != nil {
			d.off -= 1 + 1 + klen
			if err := u.UnmarshalMCPACK(d.next()); err != nil {
				d.error(err)
			}
			return
		}
		v = pv
	}

	val := Uint64(d.data[d.off:])
	d.off += 8 // value

	if !v.IsValid() {
		return
	}
	v.SetUint(val)
}

// setWithProperType sets proper value to field based on its type,
// but it does not return error for failing parsing,
// because we want to use default value that is already assigned to strcut.
func setWithProperType(t reflect.Type, key *Key, field reflect.Value, delim string) error {
	switch t.Kind() {
	case reflect.String:
		if len(key.String()) == 0 {
			return nil
		}
		field.SetString(key.String())
	case reflect.Bool:
		boolVal, err := key.Bool()
		if err != nil {
			return nil
		}
		field.SetBool(boolVal)
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		durationVal, err := key.Duration()
		// Skip zero value
		if err == nil && int(durationVal) > 0 {
			field.Set(reflect.ValueOf(durationVal))
			return nil
		}

		intVal, err := key.Int64()
		if err != nil || intVal == 0 {
			return nil
		}
		field.SetInt(intVal)
	//	byte is an alias for uint8, so supporting uint8 breaks support for byte
	case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		durationVal, err := key.Duration()
		// Skip zero value
		if err == nil && int(durationVal) > 0 {
			field.Set(reflect.ValueOf(durationVal))
			return nil
		}

		uintVal, err := key.Uint64()
		if err != nil {
			return nil
		}
		field.SetUint(uintVal)

	case reflect.Float64:
		floatVal, err := key.Float64()
		if err != nil {
			return nil
		}
		field.SetFloat(floatVal)
	case reflectTime:
		timeVal, err := key.Time()
		if err != nil {
			return nil
		}
		field.Set(reflect.ValueOf(timeVal))
	case reflect.Slice:
		return setSliceWithProperType(key, field, delim)
	default:
		return fmt.Errorf("unsupported type '%s'", t)
	}
	return nil
}

// This sets the value in a struct of an indeterminate type to the
// matching value from the request (via Form middleware) in the
// same type, so that not all deserialized values have to be strings.
// Supported types are string, int, float, and bool.
func setWithProperType(valueKind reflect.Kind, val string, structField reflect.Value, nameInTag string, errors Errors) {
	if scan, ok := structField.Addr().Interface().(sql.Scanner); ok {
		scan.Scan(val)
		return
	}
	switch valueKind {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		if val == "" {
			val = "0"
		}
		intVal, err := strconv.ParseInt(val, 10, 64)
		if err != nil {
			errors.Add([]string{nameInTag}, TypeError, "Value could not be parsed as integer")
		} else {
			structField.SetInt(intVal)
		}
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		if val == "" {
			val = "0"
		}
		uintVal, err := strconv.ParseUint(val, 10, 64)
		if err != nil {
			errors.Add([]string{nameInTag}, TypeError, "Value could not be parsed as unsigned integer")
		} else {
			structField.SetUint(uintVal)
		}
	case reflect.Bool:
		if val == "" {
			val = "false"
		}
		boolVal, err := strconv.ParseBool(val)
		if err != nil {
			errors.Add([]string{nameInTag}, TypeError, "Value could not be parsed as boolean")
		} else {
			structField.SetBool(boolVal)
		}
	case reflect.Float32:
		if val == "" {
			val = "0.0"
		}
		floatVal, err := strconv.ParseFloat(val, 32)
		if err != nil {
			errors.Add([]string{nameInTag}, TypeError, "Value could not be parsed as 32-bit float")
		} else {
			structField.SetFloat(floatVal)
		}
	case reflect.Float64:
		if val == "" {
			val = "0.0"
		}
		floatVal, err := strconv.ParseFloat(val, 64)
		if err != nil {
			errors.Add([]string{nameInTag}, TypeError, "Value could not be parsed as 64-bit float")
		} else {
			structField.SetFloat(floatVal)
		}
	case reflect.String:
		structField.SetString(val)
	}
}

func setConfigVal(str string, field reflect.Value) error {
	t := field.Kind()
	switch {
	case t == reflect.String:
		field.SetString(str)
	case t >= reflect.Int && t <= reflect.Int64:
		if x, err := strconv.ParseInt(str, 10, 64); err != nil {
			return err
		} else {
			field.SetInt(x)
		}
	case t >= reflect.Uint && t <= reflect.Uint64:
		if x, err := strconv.ParseUint(str, 10, 64); err != nil {
			return err
		} else {
			field.SetUint(x)
		}
	case t >= reflect.Float32 && t <= reflect.Float64:
		if x, err := strconv.ParseFloat(str, 64); err != nil {
			return err
		} else {
			field.SetFloat(x)
		}
	case t == reflect.Bool:
		if x, err := strconv.ParseBool(str); err != nil {
			return err
		} else {
			field.SetBool(x)
		}
	default:
		return nil
	}
	return nil
}

func (decoder *Decoder) readInteger(value reflect.Value) error {

	uv, err := decoder.readU29()
	if err != nil {
		return err
	}

	vv := int32(uv)
	if uv > 0xfffffff {
		vv = int32(uv - 0x20000000)
	}

	switch value.Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		value.SetInt(int64(vv))
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		value.SetUint(uint64(uv))
	case reflect.Interface:
		value.Set(reflect.ValueOf(uv))
	default:
		return errors.New("invalid type:" + value.Type().String() + " for integer")
	}

	return nil
}

func (decoder *Decoder) readFloat(value reflect.Value) error {
	bytes, err := decoder.readBytes(8)
	if err != nil {
		return err
	}

	n := uint64(0)
	for _, b := range bytes {
		n <<= 8
		n |= uint64(b)
	}

	v := math.Float64frombits(n)

	switch value.Kind() {
	case reflect.Float32, reflect.Float64:
		value.SetFloat(v)
	case reflect.Int32, reflect.Int, reflect.Int64:
		value.SetInt(int64(v))
	case reflect.Uint32, reflect.Uint, reflect.Uint64:
		value.SetUint(uint64(v))
	case reflect.Interface:
		value.Set(reflect.ValueOf(v))
	default:
		return errors.New("invalid type:" + value.Type().String() + " for double")
	}

	return nil
}

func (d *decoder) unmarshalInt32(size uint, offset uint, result reflect.Value) (uint, error) {
	if size > 4 {
		return 0, newInvalidDatabaseError("the MaxMind DB file's data section contains bad data (int32 size of %v)", size)
	}
	value, newOffset, err := d.decodeInt(size, offset)
	if err != nil {
		return 0, err
	}

	switch result.Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		n := int64(value)
		if !result.OverflowInt(n) {
			result.SetInt(n)
			return newOffset, nil
		}
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		n := uint64(value)
		if !result.OverflowUint(n) {
			result.SetUint(n)
			return newOffset, nil
		}
	case reflect.Interface:
		if result.NumMethod() == 0 {
			result.Set(reflect.ValueOf(value))
			return newOffset, nil
		}
	}
	return newOffset, newUnmarshalTypeError(value, result.Type())
}

func setUint(rv reflect.Value, u uint64) error {
	switch rv.Kind() {
	case reflect.Ptr:
		if rv.IsNil() {
			if rv.CanSet() {
				rv.Set(reflect.New(rv.Type().Elem()))
				// fall through to set indirect below
			} else {
				return fmt.Errorf("trying to put uint into unsettable nil ptr")
			}
		}
		return setUint(reflect.Indirect(rv), u)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		if rv.OverflowUint(u) {
			return fmt.Errorf("value %d does not fit into target of type %s", u, rv.Kind().String())
		}
		rv.SetUint(u)
		return nil
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		if (u == 0xffffffffffffffff) || rv.OverflowInt(int64(u)) {
			return fmt.Errorf("value %d does not fit into target of type %s", u, rv.Kind().String())
		}
		rv.SetInt(int64(u))
		return nil
	case reflect.Interface:
		rv.Set(reflect.ValueOf(u))
		return nil
	default:
		return fmt.Errorf("cannot assign uint into Kind=%s Type=%#v %#v", rv.Kind().String(), rv.Type(), rv)
	}
}