source: code/trunk/vendor/google.golang.org/protobuf/reflect/protodesc/proto.go@ 824

// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package protodesc

import (
        "fmt"
        "strings"

        "google.golang.org/protobuf/internal/encoding/defval"
        "google.golang.org/protobuf/internal/strs"
        "google.golang.org/protobuf/proto"
        "google.golang.org/protobuf/reflect/protoreflect"

        "google.golang.org/protobuf/types/descriptorpb"
)

// ToFileDescriptorProto copies a protoreflect.FileDescriptor into a
// google.protobuf.FileDescriptorProto message.
func ToFileDescriptorProto(file protoreflect.FileDescriptor) *descriptorpb.FileDescriptorProto {
        p := &descriptorpb.FileDescriptorProto{
                Name:    proto.String(file.Path()),
                Options: proto.Clone(file.Options()).(*descriptorpb.FileOptions),
        }
        if file.Package() != "" {
                p.Package = proto.String(string(file.Package()))
        }
        for i, imports := 0, file.Imports(); i < imports.Len(); i++ {
                imp := imports.Get(i)
                p.Dependency = append(p.Dependency, imp.Path())
                if imp.IsPublic {
                        p.PublicDependency = append(p.PublicDependency, int32(i))
                }
                if imp.IsWeak {
                        p.WeakDependency = append(p.WeakDependency, int32(i))
                }
        }
        for i, locs := 0, file.SourceLocations(); i < locs.Len(); i++ {
                loc := locs.Get(i)
                l := &descriptorpb.SourceCodeInfo_Location{}
                l.Path = append(l.Path, loc.Path...)
                if loc.StartLine == loc.EndLine {
                        l.Span = []int32{int32(loc.StartLine), int32(loc.StartColumn), int32(loc.EndColumn)}
                } else {
                        l.Span = []int32{int32(loc.StartLine), int32(loc.StartColumn), int32(loc.EndLine), int32(loc.EndColumn)}
                }
                l.LeadingDetachedComments = append([]string(nil), loc.LeadingDetachedComments...)
                if loc.LeadingComments != "" {
                        l.LeadingComments = proto.String(loc.LeadingComments)
                }
                if loc.TrailingComments != "" {
                        l.TrailingComments = proto.String(loc.TrailingComments)
                }
                if p.SourceCodeInfo == nil {
                        p.SourceCodeInfo = &descriptorpb.SourceCodeInfo{}
                }
                p.SourceCodeInfo.Location = append(p.SourceCodeInfo.Location, l)

        }
        for i, messages := 0, file.Messages(); i < messages.Len(); i++ {
                p.MessageType = append(p.MessageType, ToDescriptorProto(messages.Get(i)))
        }
        for i, enums := 0, file.Enums(); i < enums.Len(); i++ {
                p.EnumType = append(p.EnumType, ToEnumDescriptorProto(enums.Get(i)))
        }
        for i, services := 0, file.Services(); i < services.Len(); i++ {
                p.Service = append(p.Service, ToServiceDescriptorProto(services.Get(i)))
        }
        for i, exts := 0, file.Extensions(); i < exts.Len(); i++ {
                p.Extension = append(p.Extension, ToFieldDescriptorProto(exts.Get(i)))
        }
        if syntax := file.Syntax(); syntax != protoreflect.Proto2 {
                p.Syntax = proto.String(file.Syntax().String())
        }
        return p
}

// ToDescriptorProto copies a protoreflect.MessageDescriptor into a
// google.protobuf.DescriptorProto message.
func ToDescriptorProto(message protoreflect.MessageDescriptor) *descriptorpb.DescriptorProto {
        p := &descriptorpb.DescriptorProto{
                Name:    proto.String(string(message.Name())),
                Options: proto.Clone(message.Options()).(*descriptorpb.MessageOptions),
        }
        for i, fields := 0, message.Fields(); i < fields.Len(); i++ {
                p.Field = append(p.Field, ToFieldDescriptorProto(fields.Get(i)))
        }
        for i, exts := 0, message.Extensions(); i < exts.Len(); i++ {
                p.Extension = append(p.Extension, ToFieldDescriptorProto(exts.Get(i)))
        }
        for i, messages := 0, message.Messages(); i < messages.Len(); i++ {
                p.NestedType = append(p.NestedType, ToDescriptorProto(messages.Get(i)))
        }
        for i, enums := 0, message.Enums(); i < enums.Len(); i++ {
                p.EnumType = append(p.EnumType, ToEnumDescriptorProto(enums.Get(i)))
        }
        for i, xranges := 0, message.ExtensionRanges(); i < xranges.Len(); i++ {
                xrange := xranges.Get(i)
                p.ExtensionRange = append(p.ExtensionRange, &descriptorpb.DescriptorProto_ExtensionRange{
                        Start:   proto.Int32(int32(xrange[0])),
                        End:     proto.Int32(int32(xrange[1])),
                        Options: proto.Clone(message.ExtensionRangeOptions(i)).(*descriptorpb.ExtensionRangeOptions),
                })
        }
        for i, oneofs := 0, message.Oneofs(); i < oneofs.Len(); i++ {
                p.OneofDecl = append(p.OneofDecl, ToOneofDescriptorProto(oneofs.Get(i)))
        }
        for i, ranges := 0, message.ReservedRanges(); i < ranges.Len(); i++ {
                rrange := ranges.Get(i)
                p.ReservedRange = append(p.ReservedRange, &descriptorpb.DescriptorProto_ReservedRange{
                        Start: proto.Int32(int32(rrange[0])),
                        End:   proto.Int32(int32(rrange[1])),
                })
        }
        for i, names := 0, message.ReservedNames(); i < names.Len(); i++ {
                p.ReservedName = append(p.ReservedName, string(names.Get(i)))
        }
        return p
}

// ToFieldDescriptorProto copies a protoreflect.FieldDescriptor into a
// google.protobuf.FieldDescriptorProto message.
func ToFieldDescriptorProto(field protoreflect.FieldDescriptor) *descriptorpb.FieldDescriptorProto {
        p := &descriptorpb.FieldDescriptorProto{
                Name:    proto.String(string(field.Name())),
                Number:  proto.Int32(int32(field.Number())),
                Label:   descriptorpb.FieldDescriptorProto_Label(field.Cardinality()).Enum(),
                Options: proto.Clone(field.Options()).(*descriptorpb.FieldOptions),
        }
        if field.IsExtension() {
                p.Extendee = fullNameOf(field.ContainingMessage())
        }
        if field.Kind().IsValid() {
                p.Type = descriptorpb.FieldDescriptorProto_Type(field.Kind()).Enum()
        }
        if field.Enum() != nil {
                p.TypeName = fullNameOf(field.Enum())
        }
        if field.Message() != nil {
                p.TypeName = fullNameOf(field.Message())
        }
        if field.HasJSONName() {
                // A bug in older versions of protoc would always populate the
                // "json_name" option for extensions when it is meaningless.
                // When it did so, it would always use the camel-cased field name.
                if field.IsExtension() {
                        p.JsonName = proto.String(strs.JSONCamelCase(string(field.Name())))
                } else {
                        p.JsonName = proto.String(field.JSONName())
                }
        }
        if field.Syntax() == protoreflect.Proto3 && field.HasOptionalKeyword() {
                p.Proto3Optional = proto.Bool(true)
        }
        if field.HasDefault() {
                def, err := defval.Marshal(field.Default(), field.DefaultEnumValue(), field.Kind(), defval.Descriptor)
                if err != nil && field.DefaultEnumValue() != nil {
                        def = string(field.DefaultEnumValue().Name()) // occurs for unresolved enum values
                } else if err != nil {
                        panic(fmt.Sprintf("%v: %v", field.FullName(), err))
                }
                p.DefaultValue = proto.String(def)
        }
        if oneof := field.ContainingOneof(); oneof != nil {
                p.OneofIndex = proto.Int32(int32(oneof.Index()))
        }
        return p
}

// ToOneofDescriptorProto copies a protoreflect.OneofDescriptor into a
// google.protobuf.OneofDescriptorProto message.
func ToOneofDescriptorProto(oneof protoreflect.OneofDescriptor) *descriptorpb.OneofDescriptorProto {
        return &descriptorpb.OneofDescriptorProto{
                Name:    proto.String(string(oneof.Name())),
                Options: proto.Clone(oneof.Options()).(*descriptorpb.OneofOptions),
        }
}

// ToEnumDescriptorProto copies a protoreflect.EnumDescriptor into a
// google.protobuf.EnumDescriptorProto message.
func ToEnumDescriptorProto(enum protoreflect.EnumDescriptor) *descriptorpb.EnumDescriptorProto {
        p := &descriptorpb.EnumDescriptorProto{
                Name:    proto.String(string(enum.Name())),
                Options: proto.Clone(enum.Options()).(*descriptorpb.EnumOptions),
        }
        for i, values := 0, enum.Values(); i < values.Len(); i++ {
                p.Value = append(p.Value, ToEnumValueDescriptorProto(values.Get(i)))
        }
        for i, ranges := 0, enum.ReservedRanges(); i < ranges.Len(); i++ {
                rrange := ranges.Get(i)
                p.ReservedRange = append(p.ReservedRange, &descriptorpb.EnumDescriptorProto_EnumReservedRange{
                        Start: proto.Int32(int32(rrange[0])),
                        End:   proto.Int32(int32(rrange[1])),
                })
        }
        for i, names := 0, enum.ReservedNames(); i < names.Len(); i++ {
                p.ReservedName = append(p.ReservedName, string(names.Get(i)))
        }
        return p
}

// ToEnumValueDescriptorProto copies a protoreflect.EnumValueDescriptor into a
// google.protobuf.EnumValueDescriptorProto message.
func ToEnumValueDescriptorProto(value protoreflect.EnumValueDescriptor) *descriptorpb.EnumValueDescriptorProto {
        return &descriptorpb.EnumValueDescriptorProto{
                Name:    proto.String(string(value.Name())),
                Number:  proto.Int32(int32(value.Number())),
                Options: proto.Clone(value.Options()).(*descriptorpb.EnumValueOptions),
        }
}

// ToServiceDescriptorProto copies a protoreflect.ServiceDescriptor into a
// google.protobuf.ServiceDescriptorProto message.
func ToServiceDescriptorProto(service protoreflect.ServiceDescriptor) *descriptorpb.ServiceDescriptorProto {
        p := &descriptorpb.ServiceDescriptorProto{
                Name:    proto.String(string(service.Name())),
                Options: proto.Clone(service.Options()).(*descriptorpb.ServiceOptions),
        }
        for i, methods := 0, service.Methods(); i < methods.Len(); i++ {
                p.Method = append(p.Method, ToMethodDescriptorProto(methods.Get(i)))
        }
        return p
}

// ToMethodDescriptorProto copies a protoreflect.MethodDescriptor into a
// google.protobuf.MethodDescriptorProto message.
func ToMethodDescriptorProto(method protoreflect.MethodDescriptor) *descriptorpb.MethodDescriptorProto {
        p := &descriptorpb.MethodDescriptorProto{
                Name:       proto.String(string(method.Name())),
                InputType:  fullNameOf(method.Input()),
                OutputType: fullNameOf(method.Output()),
                Options:    proto.Clone(method.Options()).(*descriptorpb.MethodOptions),
        }
        if method.IsStreamingClient() {
                p.ClientStreaming = proto.Bool(true)
        }
        if method.IsStreamingServer() {
                p.ServerStreaming = proto.Bool(true)
        }
        return p
}

func fullNameOf(d protoreflect.Descriptor) *string {
        if d == nil {
                return nil
        }
        if strings.HasPrefix(string(d.FullName()), unknownPrefix) {
                return proto.String(string(d.FullName()[len(unknownPrefix):]))
        }
        return proto.String("." + string(d.FullName()))
}