mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-14 17:24:04 +00:00
448 lines
13 KiB
Go
448 lines
13 KiB
Go
// Protocol Buffers for Go with Gadgets
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//
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// Copyright (c) 2013, The GoGo Authors. All rights reserved.
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// http://github.com/gogo/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package generator
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import (
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"bytes"
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"go/parser"
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"go/printer"
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"go/token"
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"path"
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"strings"
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"github.com/gogo/protobuf/gogoproto"
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"github.com/gogo/protobuf/proto"
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descriptor "github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
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plugin "github.com/gogo/protobuf/protoc-gen-gogo/plugin"
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)
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func (d *FileDescriptor) Messages() []*Descriptor {
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return d.desc
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}
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func (d *FileDescriptor) Enums() []*EnumDescriptor {
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return d.enum
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}
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func (d *Descriptor) IsGroup() bool {
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return d.group
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}
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func (g *Generator) IsGroup(field *descriptor.FieldDescriptorProto) bool {
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if d, ok := g.typeNameToObject[field.GetTypeName()].(*Descriptor); ok {
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return d.IsGroup()
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}
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return false
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}
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func (g *Generator) TypeNameByObject(typeName string) Object {
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o, ok := g.typeNameToObject[typeName]
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if !ok {
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g.Fail("can't find object with type", typeName)
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}
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return o
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}
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func (g *Generator) OneOfTypeName(message *Descriptor, field *descriptor.FieldDescriptorProto) string {
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typeName := message.TypeName()
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ccTypeName := CamelCaseSlice(typeName)
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fieldName := g.GetOneOfFieldName(message, field)
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tname := ccTypeName + "_" + fieldName
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// It is possible for this to collide with a message or enum
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// nested in this message. Check for collisions.
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ok := true
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for _, desc := range message.nested {
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if strings.Join(desc.TypeName(), "_") == tname {
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ok = false
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break
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}
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}
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for _, enum := range message.enums {
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if strings.Join(enum.TypeName(), "_") == tname {
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ok = false
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break
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}
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}
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if !ok {
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tname += "_"
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}
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return tname
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}
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type PluginImports interface {
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NewImport(pkg string) Single
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GenerateImports(file *FileDescriptor)
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}
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type pluginImports struct {
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generator *Generator
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singles []Single
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}
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func NewPluginImports(generator *Generator) *pluginImports {
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return &pluginImports{generator, make([]Single, 0)}
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}
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func (this *pluginImports) NewImport(pkg string) Single {
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imp := newImportedPackage(this.generator.ImportPrefix, pkg)
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this.singles = append(this.singles, imp)
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return imp
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}
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func (this *pluginImports) GenerateImports(file *FileDescriptor) {
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for _, s := range this.singles {
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if s.IsUsed() {
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this.generator.PrintImport(s.Name(), s.Location())
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}
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}
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}
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type Single interface {
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Use() string
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IsUsed() bool
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Name() string
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Location() string
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}
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type importedPackage struct {
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used bool
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pkg string
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name string
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importPrefix string
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}
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func newImportedPackage(importPrefix, pkg string) *importedPackage {
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return &importedPackage{
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pkg: pkg,
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importPrefix: importPrefix,
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}
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}
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func (this *importedPackage) Use() string {
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if !this.used {
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this.name = RegisterUniquePackageName(this.pkg, nil)
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this.used = true
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}
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return this.name
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}
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func (this *importedPackage) IsUsed() bool {
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return this.used
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}
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func (this *importedPackage) Name() string {
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return this.name
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}
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func (this *importedPackage) Location() string {
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return this.importPrefix + this.pkg
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}
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func (g *Generator) GetFieldName(message *Descriptor, field *descriptor.FieldDescriptorProto) string {
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goTyp, _ := g.GoType(message, field)
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fieldname := CamelCase(*field.Name)
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if gogoproto.IsCustomName(field) {
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fieldname = gogoproto.GetCustomName(field)
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}
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if gogoproto.IsEmbed(field) {
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fieldname = EmbedFieldName(goTyp)
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}
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if field.OneofIndex != nil {
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fieldname = message.OneofDecl[int(*field.OneofIndex)].GetName()
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fieldname = CamelCase(fieldname)
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}
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for _, f := range methodNames {
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if f == fieldname {
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return fieldname + "_"
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}
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}
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if !gogoproto.IsProtoSizer(message.file, message.DescriptorProto) {
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if fieldname == "Size" {
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return fieldname + "_"
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}
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}
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return fieldname
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}
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func (g *Generator) GetOneOfFieldName(message *Descriptor, field *descriptor.FieldDescriptorProto) string {
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goTyp, _ := g.GoType(message, field)
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fieldname := CamelCase(*field.Name)
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if gogoproto.IsCustomName(field) {
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fieldname = gogoproto.GetCustomName(field)
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}
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if gogoproto.IsEmbed(field) {
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fieldname = EmbedFieldName(goTyp)
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}
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for _, f := range methodNames {
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if f == fieldname {
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return fieldname + "_"
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}
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}
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if !gogoproto.IsProtoSizer(message.file, message.DescriptorProto) {
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if fieldname == "Size" {
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return fieldname + "_"
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}
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}
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return fieldname
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}
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func (g *Generator) IsMap(field *descriptor.FieldDescriptorProto) bool {
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if !field.IsMessage() {
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return false
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}
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byName := g.ObjectNamed(field.GetTypeName())
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desc, ok := byName.(*Descriptor)
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if byName == nil || !ok || !desc.GetOptions().GetMapEntry() {
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return false
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}
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return true
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}
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func (g *Generator) GetMapKeyField(field, keyField *descriptor.FieldDescriptorProto) *descriptor.FieldDescriptorProto {
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if !gogoproto.IsCastKey(field) {
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return keyField
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}
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keyField = proto.Clone(keyField).(*descriptor.FieldDescriptorProto)
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if keyField.Options == nil {
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keyField.Options = &descriptor.FieldOptions{}
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}
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keyType := gogoproto.GetCastKey(field)
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if err := proto.SetExtension(keyField.Options, gogoproto.E_Casttype, &keyType); err != nil {
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g.Fail(err.Error())
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}
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return keyField
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}
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func (g *Generator) GetMapValueField(field, valField *descriptor.FieldDescriptorProto) *descriptor.FieldDescriptorProto {
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if gogoproto.IsCustomType(field) && gogoproto.IsCastValue(field) {
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g.Fail("cannot have a customtype and casttype: ", field.String())
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}
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valField = proto.Clone(valField).(*descriptor.FieldDescriptorProto)
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if valField.Options == nil {
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valField.Options = &descriptor.FieldOptions{}
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}
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stdtime := gogoproto.IsStdTime(field)
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if stdtime {
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if err := proto.SetExtension(valField.Options, gogoproto.E_Stdtime, &stdtime); err != nil {
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g.Fail(err.Error())
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}
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}
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stddur := gogoproto.IsStdDuration(field)
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if stddur {
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if err := proto.SetExtension(valField.Options, gogoproto.E_Stdduration, &stddur); err != nil {
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g.Fail(err.Error())
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}
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}
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if valType := gogoproto.GetCastValue(field); len(valType) > 0 {
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if err := proto.SetExtension(valField.Options, gogoproto.E_Casttype, &valType); err != nil {
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g.Fail(err.Error())
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}
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}
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if valType := gogoproto.GetCustomType(field); len(valType) > 0 {
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if err := proto.SetExtension(valField.Options, gogoproto.E_Customtype, &valType); err != nil {
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g.Fail(err.Error())
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}
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}
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nullable := gogoproto.IsNullable(field)
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if err := proto.SetExtension(valField.Options, gogoproto.E_Nullable, &nullable); err != nil {
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g.Fail(err.Error())
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}
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return valField
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}
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// GoMapValueTypes returns the map value Go type and the alias map value Go type (for casting), taking into
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// account whether the map is nullable or the value is a message.
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func GoMapValueTypes(mapField, valueField *descriptor.FieldDescriptorProto, goValueType, goValueAliasType string) (nullable bool, outGoType string, outGoAliasType string) {
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nullable = gogoproto.IsNullable(mapField) && (valueField.IsMessage() || gogoproto.IsCustomType(mapField))
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if nullable {
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// ensure the non-aliased Go value type is a pointer for consistency
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if strings.HasPrefix(goValueType, "*") {
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outGoType = goValueType
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} else {
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outGoType = "*" + goValueType
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}
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outGoAliasType = goValueAliasType
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} else {
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outGoType = strings.Replace(goValueType, "*", "", 1)
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outGoAliasType = strings.Replace(goValueAliasType, "*", "", 1)
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}
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return
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}
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func GoTypeToName(goTyp string) string {
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return strings.Replace(strings.Replace(goTyp, "*", "", -1), "[]", "", -1)
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}
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func EmbedFieldName(goTyp string) string {
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goTyp = GoTypeToName(goTyp)
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goTyps := strings.Split(goTyp, ".")
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if len(goTyps) == 1 {
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return goTyp
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}
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if len(goTyps) == 2 {
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return goTyps[1]
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}
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panic("unreachable")
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}
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func (g *Generator) GeneratePlugin(p Plugin) {
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plugins = []Plugin{p}
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p.Init(g)
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// Generate the output. The generator runs for every file, even the files
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// that we don't generate output for, so that we can collate the full list
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// of exported symbols to support public imports.
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genFileMap := make(map[*FileDescriptor]bool, len(g.genFiles))
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for _, file := range g.genFiles {
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genFileMap[file] = true
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}
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for _, file := range g.allFiles {
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g.Reset()
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g.writeOutput = genFileMap[file]
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g.generatePlugin(file, p)
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if !g.writeOutput {
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continue
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}
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g.Response.File = append(g.Response.File, &plugin.CodeGeneratorResponse_File{
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Name: proto.String(file.goFileName()),
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Content: proto.String(g.String()),
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})
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}
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}
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func (g *Generator) SetFile(file *descriptor.FileDescriptorProto) {
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g.file = g.FileOf(file)
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}
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func (g *Generator) generatePlugin(file *FileDescriptor, p Plugin) {
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g.writtenImports = make(map[string]bool)
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g.file = g.FileOf(file.FileDescriptorProto)
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g.usedPackages = make(map[string]bool)
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// Run the plugins before the imports so we know which imports are necessary.
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p.Generate(file)
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// Generate header and imports last, though they appear first in the output.
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rem := g.Buffer
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g.Buffer = new(bytes.Buffer)
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g.generateHeader()
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p.GenerateImports(g.file)
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g.generateImports()
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if !g.writeOutput {
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return
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}
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g.Write(rem.Bytes())
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// Reformat generated code.
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contents := string(g.Buffer.Bytes())
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fset := token.NewFileSet()
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ast, err := parser.ParseFile(fset, "", g, parser.ParseComments)
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if err != nil {
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g.Fail("bad Go source code was generated:", contents, err.Error())
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return
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}
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g.Reset()
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err = (&printer.Config{Mode: printer.TabIndent | printer.UseSpaces, Tabwidth: 8}).Fprint(g, fset, ast)
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if err != nil {
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g.Fail("generated Go source code could not be reformatted:", err.Error())
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}
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}
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func GetCustomType(field *descriptor.FieldDescriptorProto) (packageName string, typ string, err error) {
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return getCustomType(field)
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}
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func getCustomType(field *descriptor.FieldDescriptorProto) (packageName string, typ string, err error) {
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if field.Options != nil {
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var v interface{}
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v, err = proto.GetExtension(field.Options, gogoproto.E_Customtype)
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if err == nil && v.(*string) != nil {
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ctype := *(v.(*string))
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packageName, typ = splitCPackageType(ctype)
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return packageName, typ, nil
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}
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}
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return "", "", err
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}
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func splitCPackageType(ctype string) (packageName string, typ string) {
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ss := strings.Split(ctype, ".")
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if len(ss) == 1 {
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return "", ctype
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}
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packageName = strings.Join(ss[0:len(ss)-1], ".")
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typeName := ss[len(ss)-1]
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importStr := strings.Map(badToUnderscore, packageName)
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typ = importStr + "." + typeName
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return packageName, typ
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}
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func getCastType(field *descriptor.FieldDescriptorProto) (packageName string, typ string, err error) {
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if field.Options != nil {
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var v interface{}
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v, err = proto.GetExtension(field.Options, gogoproto.E_Casttype)
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if err == nil && v.(*string) != nil {
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ctype := *(v.(*string))
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packageName, typ = splitCPackageType(ctype)
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return packageName, typ, nil
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}
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}
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return "", "", err
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}
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func FileName(file *FileDescriptor) string {
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fname := path.Base(file.FileDescriptorProto.GetName())
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fname = strings.Replace(fname, ".proto", "", -1)
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fname = strings.Replace(fname, "-", "_", -1)
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fname = strings.Replace(fname, ".", "_", -1)
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return CamelCase(fname)
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}
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func (g *Generator) AllFiles() *descriptor.FileDescriptorSet {
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set := &descriptor.FileDescriptorSet{}
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set.File = make([]*descriptor.FileDescriptorProto, len(g.allFiles))
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for i := range g.allFiles {
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set.File[i] = g.allFiles[i].FileDescriptorProto
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}
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return set
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}
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func (d *Descriptor) Path() string {
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return d.path
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}
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func (g *Generator) useTypes() string {
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pkg := strings.Map(badToUnderscore, "github.com/gogo/protobuf/types")
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g.customImports = append(g.customImports, "github.com/gogo/protobuf/types")
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return pkg
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}
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