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deepcopy.go
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/
deepcopy.go
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package deepcopy
import (
"sort"
"github.com/docker/swarmkit/protobuf/plugin"
"github.com/gogo/protobuf/gogoproto"
"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
"github.com/gogo/protobuf/protoc-gen-gogo/generator"
)
type deepCopyGen struct {
gen *generator.Generator
}
func init() {
generator.RegisterPlugin(new(deepCopyGen))
}
func (d *deepCopyGen) Name() string {
return "deepcopy"
}
func (d *deepCopyGen) Init(g *generator.Generator) {
d.gen = g
}
func (d *deepCopyGen) genMsgDeepCopy(m *generator.Descriptor) {
if !plugin.DeepcopyEnabled(m.Options) {
return
}
ccTypeName := generator.CamelCaseSlice(m.TypeName())
d.gen.P("func (m *", ccTypeName, ") Copy() *", ccTypeName, "{")
d.gen.P("\tif m == nil {")
d.gen.P("\t\treturn nil")
d.gen.P("\t}")
d.gen.P()
d.gen.P("\to := &", ccTypeName, "{")
var funcs []func()
oneOfFuncs := make(map[string][]func())
for _, f := range m.Field {
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
notNullablePrefix := ""
if !gogoproto.IsNullable(f) {
notNullablePrefix = "*"
}
// Handle all kinds of message type
if f.IsMessage() {
// Handle map type
if mapfunc := d.genMapWriter(m, f, notNullablePrefix); mapfunc != nil {
funcs = append(funcs, mapfunc)
continue
}
// Handle any message which is not repeated or part of oneof
if !f.IsRepeated() && f.OneofIndex == nil {
d.gen.P("\t\t", fName, ": ", notNullablePrefix, "m.", fName, ".Copy(),")
continue
}
}
// Handle repeated field
if f.IsRepeated() {
funcs = append(funcs, d.genRepeatedWriter(m, f, notNullablePrefix))
continue
}
// Handle oneof type
if f.OneofIndex != nil {
d.genOneOfWriter(m, f, oneOfFuncs)
continue
}
// Handle all kinds of scalar type
d.gen.P("\t\t", fName, ": m.", fName, ",")
}
d.gen.P("\t}")
d.gen.P()
for _, fn := range funcs {
fn()
}
// Sort map keys from oneOfFuncs so that generated code has consistent
// ordering.
oneOfKeys := make([]string, 0, len(oneOfFuncs))
for key := range oneOfFuncs {
oneOfKeys = append(oneOfKeys, key)
}
sort.Strings(oneOfKeys)
for _, key := range oneOfKeys {
oneOfNameFuncs := oneOfFuncs[key]
for _, oneOfFunc := range oneOfNameFuncs {
oneOfFunc()
}
d.gen.P("\t}")
d.gen.P()
}
d.gen.P("\treturn o")
d.gen.P("}")
d.gen.P()
}
func (d *deepCopyGen) genMapWriter(m *generator.Descriptor, f *descriptor.FieldDescriptorProto, notNullablePrefix string) func() {
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
dv := d.gen.ObjectNamed(f.GetTypeName())
if desc, ok := dv.(*generator.Descriptor); ok && desc.GetOptions().GetMapEntry() {
mt := d.gen.GoMapType(desc, f)
typename := mt.GoType
valueIsMessage := mt.ValueField.IsMessage()
mapfunc := func() {
d.gen.P("\tif m.", fName, " != nil {")
d.gen.P("\t\to.", fName, " = make(", typename, ")")
d.gen.P("\t\tfor k, v := range m.", fName, " {")
if valueIsMessage {
d.gen.P("\t\t\to.", fName, "[k] = ", notNullablePrefix, "v.Copy()")
} else {
d.gen.P("\t\t\to.", fName, "[k] = v")
}
d.gen.P("\t\t}")
d.gen.P("\t}")
d.gen.P()
}
return mapfunc
}
return nil
}
func (d *deepCopyGen) genRepeatedWriter(m *generator.Descriptor, f *descriptor.FieldDescriptorProto, notNullablePrefix string) func() {
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
typename, _ := d.gen.GoType(m, f)
isMessage := f.IsMessage()
repeatedFunc := func() {
d.gen.P("\tif m.", fName, " != nil {")
d.gen.P("\t\to.", fName, " = make(", typename, ", 0, len(m.", fName, "))")
d.gen.P("\t\tfor _, v := range m.", fName, " {")
if isMessage {
d.gen.P("\t\t\to.", fName, " = append(o.", fName, ", ", notNullablePrefix, "v.Copy())")
} else {
d.gen.P("\t\t\to.", fName, " = append(o.", fName, ", v)")
}
d.gen.P("\t\t}")
d.gen.P("\t}")
d.gen.P()
}
return repeatedFunc
}
func (d *deepCopyGen) genOneOfWriter(m *generator.Descriptor, f *descriptor.FieldDescriptorProto, oneOfFuncs map[string][]func()) {
ccTypeName := generator.CamelCaseSlice(m.TypeName())
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
odp := m.OneofDecl[int(*f.OneofIndex)]
oneOfName := generator.CamelCase(odp.GetName())
oneOfNameFuncs, ok := oneOfFuncs[oneOfName]
if !ok {
oneOfFunc := func() {
d.gen.P("\tswitch m.", oneOfName, ".(type) {")
}
oneOfNameFuncs = append(oneOfNameFuncs, oneOfFunc)
}
isMessage := f.IsMessage()
oneOfFunc := func() {
tName := ccTypeName + "_" + fName
d.gen.P("\tcase *", tName, ":")
d.gen.P("\t\ti := &", tName, " {")
if isMessage {
d.gen.P("\t\t\t", fName, ": m.Get", fName, "().Copy(),")
} else {
d.gen.P("\t\t\t", fName, ": m.Get", fName, "(),")
}
d.gen.P("\t\t}")
d.gen.P()
d.gen.P("\t\to.", oneOfName, " = i")
}
oneOfNameFuncs = append(oneOfNameFuncs, oneOfFunc)
oneOfFuncs[oneOfName] = oneOfNameFuncs
}
func (d *deepCopyGen) Generate(file *generator.FileDescriptor) {
d.gen.P()
for _, m := range file.Messages() {
if m.DescriptorProto.GetOptions().GetMapEntry() {
continue
}
d.genMsgDeepCopy(m)
}
d.gen.P()
}
func (d *deepCopyGen) GenerateImports(file *generator.FileDescriptor) {
}