Function stringifyMapKey

docstore/driver/codec.go:252–272

k is the key of a map. Encode it as a string. Only strings, integers (signed or unsigned), and types that implement encoding.TextMarshaler are supported.

(k reflect.Value)

// Only strings, integers (signed or unsigned), and types that implement
// encoding.TextMarshaler are supported.
func stringifyMapKey(k reflect.Value) (string, error) {
	// This is basically reflectWithString.resolve, from encoding/json/encode.go.
	if k.Kind() == reflect.String {
		return k.String(), nil
	}
	if tm, ok := k.Interface().(encoding.TextMarshaler); ok {
		b, err := tm.MarshalText()
		if err != nil {
			return "", err
		}
		return string(b), nil
	}
	switch k.Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return strconv.FormatInt(k.Int(), 10), nil
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		return strconv.FormatUint(k.Uint(), 10), nil
	default:
		return "", gcerr.Newf(gcerr.InvalidArgument, nil, "cannot encode key %v of type %s", k, k.Type())
	}
}

func encodeStructWithFields(v reflect.Value, fields fields.List, e Encoder) error {
	e2 := e.EncodeMap(len(fields))