Method unmarshalAttr

opensca/sca/java/xml/read.go:251–303

unmarshalAttr unmarshals a single XML attribute into val.

(val reflect.Value, attr Attr)

// unmarshalAttr unmarshals a single XML attribute into val.
func (d *Decoder) unmarshalAttr(val reflect.Value, attr Attr) error {
	if val.Kind() == reflect.Pointer {
		if val.IsNil() {
			val.Set(reflect.New(val.Type().Elem()))
		}
		val = val.Elem()
	}
	if val.CanInterface() && val.Type().Implements(unmarshalerAttrType) {
		// This is an unmarshaler with a non-pointer receiver,
		// so it's likely to be incorrect, but we do what we're told.
		return val.Interface().(UnmarshalerAttr).UnmarshalXMLAttr(attr)
	}
	if val.CanAddr() {
		pv := val.Addr()
		if pv.CanInterface() && pv.Type().Implements(unmarshalerAttrType) {
			return pv.Interface().(UnmarshalerAttr).UnmarshalXMLAttr(attr)
		}
	}

	// Not an UnmarshalerAttr; try encoding.TextUnmarshaler.
	if val.CanInterface() && val.Type().Implements(textUnmarshalerType) {
		// This is an unmarshaler with a non-pointer receiver,
		// so it's likely to be incorrect, but we do what we're told.
		return val.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(attr.Value))
	}
	if val.CanAddr() {
		pv := val.Addr()
		if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) {
			return pv.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(attr.Value))
		}
	}

	if val.Type().Kind() == reflect.Slice && val.Type().Elem().Kind() != reflect.Uint8 {
		// Slice of element values.
		// Grow slice.
		n := val.Len()
		val.Set(reflect.Append(val, reflect.Zero(val.Type().Elem())))

		// Recur to read element into slice.
		if err := d.unmarshalAttr(val.Index(n), attr); err != nil {
			val.SetLen(n)
			return err
		}
		return nil
	}

	if val.Type() == attrType {
		val.Set(reflect.ValueOf(attr))
		return nil
	}

	return copyValue(val, []byte(attr.Value))
}

var (
	attrType            = reflect.TypeFor[Attr]()