コード例 #1
0
ファイル: jsonpb.go プロジェクト: andres-erbsen/protobuf
// marshalObject writes a struct to the Writer.
func (m *Marshaler) marshalObject(out *errWriter, v proto.Message, indent string) error {
	// Prefer specialized marshalers if available
	if mlr, ok := v.(json.Marshaler); ok {
		bs, err := mlr.MarshalJSON()
		if err != nil {
			return err
		}
		if out.err != nil {
			return out.err
		}
		_, out.err = out.writer.Write(bs)
		return out.err
	}

	out.write("{")
	if m.Indent != "" {
		out.write("\n")
	}

	s := reflect.ValueOf(v).Elem()
	writeBeforeField := ""
	for i := 0; i < s.NumField(); i++ {
		value := s.Field(i)
		valueField := s.Type().Field(i)
		if strings.HasPrefix(valueField.Name, "XXX_") {
			continue
		}
		fieldName := jsonFieldName(valueField)

		// TODO: proto3 objects should have default values omitted.

		// IsNil will panic on most value kinds.
		switch value.Kind() {
		case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
			if value.IsNil() {
				continue
			}
		}

		// Oneof fields need special handling.
		if valueField.Tag.Get("protobuf_oneof") != "" {
			// value is an interface containing &T{real_value}.
			sv := value.Elem().Elem() // interface -> *T -> T
			value = sv.Field(0)
			valueField = sv.Type().Field(0)

			var p proto.Properties
			p.Parse(sv.Type().Field(0).Tag.Get("protobuf"))
			fieldName = p.OrigName
		}

		out.write(writeBeforeField)
		if m.Indent != "" {
			out.write(indent)
			out.write(m.Indent)
		}
		out.write(`"`)
		out.write(fieldName)
		out.write(`":`)
		if m.Indent != "" {
			out.write(" ")
		}

		if err := m.marshalValue(out, value, valueField, indent); err != nil {
			return err
		}

		if m.Indent != "" {
			writeBeforeField = ",\n"
		} else {
			writeBeforeField = ","
		}
	}

	if m.Indent != "" {
		out.write("\n")
		out.write(indent)
	}
	out.write("}")
	return out.err
}
コード例 #2
0
ファイル: jsonpb.go プロジェクト: andres-erbsen/protobuf
// jsonFieldName returns the field name to use.
func jsonFieldName(f reflect.StructField) string {
	var prop proto.Properties
	prop.Init(f.Type, f.Name, f.Tag.Get("protobuf"), &f)
	return prop.OrigName
}