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- package proto
- import (
- "fmt"
- "log"
- "reflect"
- "strings"
- )
- func Clone(src Message) Message {
- in := reflect.ValueOf(src)
- if in.IsNil() {
- return src
- }
- out := reflect.New(in.Type().Elem())
- dst := out.Interface().(Message)
- Merge(dst, src)
- return dst
- }
- type Merger interface {
-
-
-
-
-
- Merge(src Message)
- }
- type generatedMerger interface {
- XXX_Merge(src Message)
- }
- func Merge(dst, src Message) {
- if m, ok := dst.(Merger); ok {
- m.Merge(src)
- return
- }
- in := reflect.ValueOf(src)
- out := reflect.ValueOf(dst)
- if out.IsNil() {
- panic("proto: nil destination")
- }
- if in.Type() != out.Type() {
- panic(fmt.Sprintf("proto.Merge(%T, %T) type mismatch", dst, src))
- }
- if in.IsNil() {
- return
- }
- if m, ok := dst.(generatedMerger); ok {
- m.XXX_Merge(src)
- return
- }
- mergeStruct(out.Elem(), in.Elem())
- }
- func mergeStruct(out, in reflect.Value) {
- sprop := GetProperties(in.Type())
- for i := 0; i < in.NumField(); i++ {
- f := in.Type().Field(i)
- if strings.HasPrefix(f.Name, "XXX_") {
- continue
- }
- mergeAny(out.Field(i), in.Field(i), false, sprop.Prop[i])
- }
- if emIn, err := extendable(in.Addr().Interface()); err == nil {
- emOut, _ := extendable(out.Addr().Interface())
- mIn, muIn := emIn.extensionsRead()
- if mIn != nil {
- mOut := emOut.extensionsWrite()
- muIn.Lock()
- mergeExtension(mOut, mIn)
- muIn.Unlock()
- }
- }
- uf := in.FieldByName("XXX_unrecognized")
- if !uf.IsValid() {
- return
- }
- uin := uf.Bytes()
- if len(uin) > 0 {
- out.FieldByName("XXX_unrecognized").SetBytes(append([]byte(nil), uin...))
- }
- }
- func mergeAny(out, in reflect.Value, viaPtr bool, prop *Properties) {
- if in.Type() == protoMessageType {
- if !in.IsNil() {
- if out.IsNil() {
- out.Set(reflect.ValueOf(Clone(in.Interface().(Message))))
- } else {
- Merge(out.Interface().(Message), in.Interface().(Message))
- }
- }
- return
- }
- switch in.Kind() {
- case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64,
- reflect.String, reflect.Uint32, reflect.Uint64:
- if !viaPtr && isProto3Zero(in) {
- return
- }
- out.Set(in)
- case reflect.Interface:
-
- if in.IsNil() {
- return
- }
-
-
- if out.IsNil() || out.Elem().Type() != in.Elem().Type() {
- out.Set(reflect.New(in.Elem().Elem().Type()))
- }
- mergeAny(out.Elem(), in.Elem(), false, nil)
- case reflect.Map:
- if in.Len() == 0 {
- return
- }
- if out.IsNil() {
- out.Set(reflect.MakeMap(in.Type()))
- }
-
- elemKind := in.Type().Elem().Kind()
- for _, key := range in.MapKeys() {
- var val reflect.Value
- switch elemKind {
- case reflect.Ptr:
- val = reflect.New(in.Type().Elem().Elem())
- mergeAny(val, in.MapIndex(key), false, nil)
- case reflect.Slice:
- val = in.MapIndex(key)
- val = reflect.ValueOf(append([]byte{}, val.Bytes()...))
- default:
- val = in.MapIndex(key)
- }
- out.SetMapIndex(key, val)
- }
- case reflect.Ptr:
- if in.IsNil() {
- return
- }
- if out.IsNil() {
- out.Set(reflect.New(in.Elem().Type()))
- }
- mergeAny(out.Elem(), in.Elem(), true, nil)
- case reflect.Slice:
- if in.IsNil() {
- return
- }
- if in.Type().Elem().Kind() == reflect.Uint8 {
-
-
-
-
- if prop != nil && prop.proto3 && in.Len() == 0 {
- return
- }
-
-
-
- out.SetBytes(append([]byte{}, in.Bytes()...))
- return
- }
- n := in.Len()
- if out.IsNil() {
- out.Set(reflect.MakeSlice(in.Type(), 0, n))
- }
- switch in.Type().Elem().Kind() {
- case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64,
- reflect.String, reflect.Uint32, reflect.Uint64:
- out.Set(reflect.AppendSlice(out, in))
- default:
- for i := 0; i < n; i++ {
- x := reflect.Indirect(reflect.New(in.Type().Elem()))
- mergeAny(x, in.Index(i), false, nil)
- out.Set(reflect.Append(out, x))
- }
- }
- case reflect.Struct:
- mergeStruct(out, in)
- default:
-
- log.Printf("proto: don't know how to copy %v", in)
- }
- }
- func mergeExtension(out, in map[int32]Extension) {
- for extNum, eIn := range in {
- eOut := Extension{desc: eIn.desc}
- if eIn.value != nil {
- v := reflect.New(reflect.TypeOf(eIn.value)).Elem()
- mergeAny(v, reflect.ValueOf(eIn.value), false, nil)
- eOut.value = v.Interface()
- }
- if eIn.enc != nil {
- eOut.enc = make([]byte, len(eIn.enc))
- copy(eOut.enc, eIn.enc)
- }
- out[extNum] = eOut
- }
- }
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