| // Copyright 2018 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 internal_gengo is internal to the protobuf module. |
| package internal_gengo |
| |
| import ( |
| "fmt" |
| "go/ast" |
| "go/parser" |
| "go/token" |
| "math" |
| "strconv" |
| "strings" |
| "unicode" |
| "unicode/utf8" |
| |
| "google.golang.org/protobuf/compiler/protogen" |
| "google.golang.org/protobuf/internal/encoding/tag" |
| "google.golang.org/protobuf/internal/genid" |
| "google.golang.org/protobuf/internal/version" |
| "google.golang.org/protobuf/reflect/protoreflect" |
| "google.golang.org/protobuf/runtime/protoimpl" |
| |
| "google.golang.org/protobuf/types/descriptorpb" |
| "google.golang.org/protobuf/types/pluginpb" |
| ) |
| |
| // SupportedFeatures reports the set of supported protobuf language features. |
| var SupportedFeatures = uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL) |
| |
| // GenerateVersionMarkers specifies whether to generate version markers. |
| var GenerateVersionMarkers = true |
| |
| // Standard library dependencies. |
| const ( |
| base64Package = protogen.GoImportPath("encoding/base64") |
| mathPackage = protogen.GoImportPath("math") |
| reflectPackage = protogen.GoImportPath("reflect") |
| sortPackage = protogen.GoImportPath("sort") |
| stringsPackage = protogen.GoImportPath("strings") |
| syncPackage = protogen.GoImportPath("sync") |
| timePackage = protogen.GoImportPath("time") |
| utf8Package = protogen.GoImportPath("unicode/utf8") |
| ) |
| |
| // Protobuf library dependencies. |
| // |
| // These are declared as an interface type so that they can be more easily |
| // patched to support unique build environments that impose restrictions |
| // on the dependencies of generated source code. |
| var ( |
| protoPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/proto") |
| protoifacePackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/runtime/protoiface") |
| protoimplPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/runtime/protoimpl") |
| protojsonPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/encoding/protojson") |
| protoreflectPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/reflect/protoreflect") |
| protoregistryPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/reflect/protoregistry") |
| ) |
| |
| type goImportPath interface { |
| String() string |
| Ident(string) protogen.GoIdent |
| } |
| |
| // GenerateFile generates the contents of a .pb.go file. |
| func GenerateFile(gen *protogen.Plugin, file *protogen.File) *protogen.GeneratedFile { |
| filename := file.GeneratedFilenamePrefix + ".pb.go" |
| g := gen.NewGeneratedFile(filename, file.GoImportPath) |
| f := newFileInfo(file) |
| |
| genStandaloneComments(g, f, int32(genid.FileDescriptorProto_Syntax_field_number)) |
| genGeneratedHeader(gen, g, f) |
| genStandaloneComments(g, f, int32(genid.FileDescriptorProto_Package_field_number)) |
| |
| packageDoc := genPackageKnownComment(f) |
| g.P(packageDoc, "package ", f.GoPackageName) |
| g.P() |
| |
| // Emit a static check that enforces a minimum version of the proto package. |
| if GenerateVersionMarkers { |
| g.P("const (") |
| g.P("// Verify that this generated code is sufficiently up-to-date.") |
| g.P("_ = ", protoimplPackage.Ident("EnforceVersion"), "(", protoimpl.GenVersion, " - ", protoimplPackage.Ident("MinVersion"), ")") |
| g.P("// Verify that runtime/protoimpl is sufficiently up-to-date.") |
| g.P("_ = ", protoimplPackage.Ident("EnforceVersion"), "(", protoimplPackage.Ident("MaxVersion"), " - ", protoimpl.GenVersion, ")") |
| g.P(")") |
| g.P() |
| } |
| |
| for i, imps := 0, f.Desc.Imports(); i < imps.Len(); i++ { |
| genImport(gen, g, f, imps.Get(i)) |
| } |
| for _, enum := range f.allEnums { |
| genEnum(g, f, enum) |
| } |
| for _, message := range f.allMessages { |
| genMessage(g, f, message) |
| } |
| genExtensions(g, f) |
| |
| genReflectFileDescriptor(gen, g, f) |
| |
| return g |
| } |
| |
| // genStandaloneComments prints all leading comments for a FileDescriptorProto |
| // location identified by the field number n. |
| func genStandaloneComments(g *protogen.GeneratedFile, f *fileInfo, n int32) { |
| loc := f.Desc.SourceLocations().ByPath(protoreflect.SourcePath{n}) |
| for _, s := range loc.LeadingDetachedComments { |
| g.P(protogen.Comments(s)) |
| g.P() |
| } |
| if s := loc.LeadingComments; s != "" { |
| g.P(protogen.Comments(s)) |
| g.P() |
| } |
| } |
| |
| func genGeneratedHeader(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo) { |
| g.P("// Code generated by protoc-gen-go. DO NOT EDIT.") |
| |
| if GenerateVersionMarkers { |
| g.P("// versions:") |
| protocGenGoVersion := version.String() |
| protocVersion := "(unknown)" |
| if v := gen.Request.GetCompilerVersion(); v != nil { |
| protocVersion = fmt.Sprintf("v%v.%v.%v", v.GetMajor(), v.GetMinor(), v.GetPatch()) |
| if s := v.GetSuffix(); s != "" { |
| protocVersion += "-" + s |
| } |
| } |
| g.P("// \tprotoc-gen-go ", protocGenGoVersion) |
| g.P("// \tprotoc ", protocVersion) |
| } |
| |
| if f.Proto.GetOptions().GetDeprecated() { |
| g.P("// ", f.Desc.Path(), " is a deprecated file.") |
| } else { |
| g.P("// source: ", f.Desc.Path()) |
| } |
| g.P() |
| } |
| |
| func genImport(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, imp protoreflect.FileImport) { |
| impFile, ok := gen.FilesByPath[imp.Path()] |
| if !ok { |
| return |
| } |
| if impFile.GoImportPath == f.GoImportPath { |
| // Don't generate imports or aliases for types in the same Go package. |
| return |
| } |
| // Generate imports for all non-weak dependencies, even if they are not |
| // referenced, because other code and tools depend on having the |
| // full transitive closure of protocol buffer types in the binary. |
| if !imp.IsWeak { |
| g.Import(impFile.GoImportPath) |
| } |
| if !imp.IsPublic { |
| return |
| } |
| |
| // Generate public imports by generating the imported file, parsing it, |
| // and extracting every symbol that should receive a forwarding declaration. |
| impGen := GenerateFile(gen, impFile) |
| impGen.Skip() |
| b, err := impGen.Content() |
| if err != nil { |
| gen.Error(err) |
| return |
| } |
| fset := token.NewFileSet() |
| astFile, err := parser.ParseFile(fset, "", b, parser.ParseComments) |
| if err != nil { |
| gen.Error(err) |
| return |
| } |
| genForward := func(tok token.Token, name string, expr ast.Expr) { |
| // Don't import unexported symbols. |
| r, _ := utf8.DecodeRuneInString(name) |
| if !unicode.IsUpper(r) { |
| return |
| } |
| // Don't import the FileDescriptor. |
| if name == impFile.GoDescriptorIdent.GoName { |
| return |
| } |
| // Don't import decls referencing a symbol defined in another package. |
| // i.e., don't import decls which are themselves public imports: |
| // |
| // type T = somepackage.T |
| if _, ok := expr.(*ast.SelectorExpr); ok { |
| return |
| } |
| g.P(tok, " ", name, " = ", impFile.GoImportPath.Ident(name)) |
| } |
| g.P("// Symbols defined in public import of ", imp.Path(), ".") |
| g.P() |
| for _, decl := range astFile.Decls { |
| switch decl := decl.(type) { |
| case *ast.GenDecl: |
| for _, spec := range decl.Specs { |
| switch spec := spec.(type) { |
| case *ast.TypeSpec: |
| genForward(decl.Tok, spec.Name.Name, spec.Type) |
| case *ast.ValueSpec: |
| for i, name := range spec.Names { |
| var expr ast.Expr |
| if i < len(spec.Values) { |
| expr = spec.Values[i] |
| } |
| genForward(decl.Tok, name.Name, expr) |
| } |
| case *ast.ImportSpec: |
| default: |
| panic(fmt.Sprintf("can't generate forward for spec type %T", spec)) |
| } |
| } |
| } |
| } |
| g.P() |
| } |
| |
| func genEnum(g *protogen.GeneratedFile, f *fileInfo, e *enumInfo) { |
| // Enum type declaration. |
| g.Annotate(e.GoIdent.GoName, e.Location) |
| leadingComments := appendDeprecationSuffix(e.Comments.Leading, |
| e.Desc.Options().(*descriptorpb.EnumOptions).GetDeprecated()) |
| g.P(leadingComments, |
| "type ", e.GoIdent, " int32") |
| |
| // Enum value constants. |
| g.P("const (") |
| for _, value := range e.Values { |
| g.Annotate(value.GoIdent.GoName, value.Location) |
| leadingComments := appendDeprecationSuffix(value.Comments.Leading, |
| value.Desc.Options().(*descriptorpb.EnumValueOptions).GetDeprecated()) |
| g.P(leadingComments, |
| value.GoIdent, " ", e.GoIdent, " = ", value.Desc.Number(), |
| trailingComment(value.Comments.Trailing)) |
| } |
| g.P(")") |
| g.P() |
| |
| // Enum value maps. |
| g.P("// Enum value maps for ", e.GoIdent, ".") |
| g.P("var (") |
| g.P(e.GoIdent.GoName+"_name", " = map[int32]string{") |
| for _, value := range e.Values { |
| duplicate := "" |
| if value.Desc != e.Desc.Values().ByNumber(value.Desc.Number()) { |
| duplicate = "// Duplicate value: " |
| } |
| g.P(duplicate, value.Desc.Number(), ": ", strconv.Quote(string(value.Desc.Name())), ",") |
| } |
| g.P("}") |
| g.P(e.GoIdent.GoName+"_value", " = map[string]int32{") |
| for _, value := range e.Values { |
| g.P(strconv.Quote(string(value.Desc.Name())), ": ", value.Desc.Number(), ",") |
| } |
| g.P("}") |
| g.P(")") |
| g.P() |
| |
| // Enum method. |
| // |
| // NOTE: A pointer value is needed to represent presence in proto2. |
| // Since a proto2 message can reference a proto3 enum, it is useful to |
| // always generate this method (even on proto3 enums) to support that case. |
| g.P("func (x ", e.GoIdent, ") Enum() *", e.GoIdent, " {") |
| g.P("p := new(", e.GoIdent, ")") |
| g.P("*p = x") |
| g.P("return p") |
| g.P("}") |
| g.P() |
| |
| // String method. |
| g.P("func (x ", e.GoIdent, ") String() string {") |
| g.P("return ", protoimplPackage.Ident("X"), ".EnumStringOf(x.Descriptor(), ", protoreflectPackage.Ident("EnumNumber"), "(x))") |
| g.P("}") |
| g.P() |
| |
| genEnumReflectMethods(g, f, e) |
| |
| // UnmarshalJSON method. |
| if e.genJSONMethod && e.Desc.Syntax() == protoreflect.Proto2 { |
| g.P("// Deprecated: Do not use.") |
| g.P("func (x *", e.GoIdent, ") UnmarshalJSON(b []byte) error {") |
| g.P("num, err := ", protoimplPackage.Ident("X"), ".UnmarshalJSONEnum(x.Descriptor(), b)") |
| g.P("if err != nil {") |
| g.P("return err") |
| g.P("}") |
| g.P("*x = ", e.GoIdent, "(num)") |
| g.P("return nil") |
| g.P("}") |
| g.P() |
| } |
| |
| // EnumDescriptor method. |
| if e.genRawDescMethod { |
| var indexes []string |
| for i := 1; i < len(e.Location.Path); i += 2 { |
| indexes = append(indexes, strconv.Itoa(int(e.Location.Path[i]))) |
| } |
| g.P("// Deprecated: Use ", e.GoIdent, ".Descriptor instead.") |
| g.P("func (", e.GoIdent, ") EnumDescriptor() ([]byte, []int) {") |
| g.P("return ", rawDescVarName(f), "GZIP(), []int{", strings.Join(indexes, ","), "}") |
| g.P("}") |
| g.P() |
| f.needRawDesc = true |
| } |
| } |
| |
| func genMessage(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| if m.Desc.IsMapEntry() { |
| return |
| } |
| |
| // Message type declaration. |
| g.Annotate(m.GoIdent.GoName, m.Location) |
| leadingComments := appendDeprecationSuffix(m.Comments.Leading, |
| m.Desc.Options().(*descriptorpb.MessageOptions).GetDeprecated()) |
| g.P(leadingComments, |
| "type ", m.GoIdent, " struct {") |
| genMessageFields(g, f, m) |
| g.P("}") |
| g.P() |
| |
| genMessageKnownFunctions(g, f, m) |
| genMessageDefaultDecls(g, f, m) |
| genMessageMethods(g, f, m) |
| genMessageOneofWrapperTypes(g, f, m) |
| } |
| |
| func genMessageFields(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| sf := f.allMessageFieldsByPtr[m] |
| genMessageInternalFields(g, f, m, sf) |
| for _, field := range m.Fields { |
| genMessageField(g, f, m, field, sf) |
| } |
| } |
| |
| func genMessageInternalFields(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, sf *structFields) { |
| g.P(genid.State_goname, " ", protoimplPackage.Ident("MessageState")) |
| sf.append(genid.State_goname) |
| g.P(genid.SizeCache_goname, " ", protoimplPackage.Ident("SizeCache")) |
| sf.append(genid.SizeCache_goname) |
| if m.hasWeak { |
| g.P(genid.WeakFields_goname, " ", protoimplPackage.Ident("WeakFields")) |
| sf.append(genid.WeakFields_goname) |
| } |
| g.P(genid.UnknownFields_goname, " ", protoimplPackage.Ident("UnknownFields")) |
| sf.append(genid.UnknownFields_goname) |
| if m.Desc.ExtensionRanges().Len() > 0 { |
| g.P(genid.ExtensionFields_goname, " ", protoimplPackage.Ident("ExtensionFields")) |
| sf.append(genid.ExtensionFields_goname) |
| } |
| if sf.count > 0 { |
| g.P() |
| } |
| } |
| |
| func genMessageField(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, field *protogen.Field, sf *structFields) { |
| if oneof := field.Oneof; oneof != nil && !oneof.Desc.IsSynthetic() { |
| // It would be a bit simpler to iterate over the oneofs below, |
| // but generating the field here keeps the contents of the Go |
| // struct in the same order as the contents of the source |
| // .proto file. |
| if oneof.Fields[0] != field { |
| return // only generate for first appearance |
| } |
| |
| tags := structTags{ |
| {"protobuf_oneof", string(oneof.Desc.Name())}, |
| } |
| if m.isTracked { |
| tags = append(tags, gotrackTags...) |
| } |
| |
| g.Annotate(m.GoIdent.GoName+"."+oneof.GoName, oneof.Location) |
| leadingComments := oneof.Comments.Leading |
| if leadingComments != "" { |
| leadingComments += "\n" |
| } |
| ss := []string{fmt.Sprintf(" Types that are assignable to %s:\n", oneof.GoName)} |
| for _, field := range oneof.Fields { |
| ss = append(ss, "\t*"+field.GoIdent.GoName+"\n") |
| } |
| leadingComments += protogen.Comments(strings.Join(ss, "")) |
| g.P(leadingComments, |
| oneof.GoName, " ", oneofInterfaceName(oneof), tags) |
| sf.append(oneof.GoName) |
| return |
| } |
| goType, pointer := fieldGoType(g, f, field) |
| if pointer { |
| goType = "*" + goType |
| } |
| tags := structTags{ |
| {"protobuf", fieldProtobufTagValue(field)}, |
| {"json", fieldJSONTagValue(field)}, |
| } |
| if field.Desc.IsMap() { |
| key := field.Message.Fields[0] |
| val := field.Message.Fields[1] |
| tags = append(tags, structTags{ |
| {"protobuf_key", fieldProtobufTagValue(key)}, |
| {"protobuf_val", fieldProtobufTagValue(val)}, |
| }...) |
| } |
| if m.isTracked { |
| tags = append(tags, gotrackTags...) |
| } |
| |
| name := field.GoName |
| if field.Desc.IsWeak() { |
| name = genid.WeakFieldPrefix_goname + name |
| } |
| g.Annotate(m.GoIdent.GoName+"."+name, field.Location) |
| leadingComments := appendDeprecationSuffix(field.Comments.Leading, |
| field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated()) |
| g.P(leadingComments, |
| name, " ", goType, tags, |
| trailingComment(field.Comments.Trailing)) |
| sf.append(field.GoName) |
| } |
| |
| // genMessageDefaultDecls generates consts and vars holding the default |
| // values of fields. |
| func genMessageDefaultDecls(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| var consts, vars []string |
| for _, field := range m.Fields { |
| if !field.Desc.HasDefault() { |
| continue |
| } |
| name := "Default_" + m.GoIdent.GoName + "_" + field.GoName |
| goType, _ := fieldGoType(g, f, field) |
| defVal := field.Desc.Default() |
| switch field.Desc.Kind() { |
| case protoreflect.StringKind: |
| consts = append(consts, fmt.Sprintf("%s = %s(%q)", name, goType, defVal.String())) |
| case protoreflect.BytesKind: |
| vars = append(vars, fmt.Sprintf("%s = %s(%q)", name, goType, defVal.Bytes())) |
| case protoreflect.EnumKind: |
| idx := field.Desc.DefaultEnumValue().Index() |
| val := field.Enum.Values[idx] |
| if val.GoIdent.GoImportPath == f.GoImportPath { |
| consts = append(consts, fmt.Sprintf("%s = %s", name, g.QualifiedGoIdent(val.GoIdent))) |
| } else { |
| // If the enum value is declared in a different Go package, |
| // reference it by number since the name may not be correct. |
| // See https://github.com/golang/protobuf/issues/513. |
| consts = append(consts, fmt.Sprintf("%s = %s(%d) // %s", |
| name, g.QualifiedGoIdent(field.Enum.GoIdent), val.Desc.Number(), g.QualifiedGoIdent(val.GoIdent))) |
| } |
| case protoreflect.FloatKind, protoreflect.DoubleKind: |
| if f := defVal.Float(); math.IsNaN(f) || math.IsInf(f, 0) { |
| var fn, arg string |
| switch f := defVal.Float(); { |
| case math.IsInf(f, -1): |
| fn, arg = g.QualifiedGoIdent(mathPackage.Ident("Inf")), "-1" |
| case math.IsInf(f, +1): |
| fn, arg = g.QualifiedGoIdent(mathPackage.Ident("Inf")), "+1" |
| case math.IsNaN(f): |
| fn, arg = g.QualifiedGoIdent(mathPackage.Ident("NaN")), "" |
| } |
| vars = append(vars, fmt.Sprintf("%s = %s(%s(%s))", name, goType, fn, arg)) |
| } else { |
| consts = append(consts, fmt.Sprintf("%s = %s(%v)", name, goType, f)) |
| } |
| default: |
| consts = append(consts, fmt.Sprintf("%s = %s(%v)", name, goType, defVal.Interface())) |
| } |
| } |
| if len(consts) > 0 { |
| g.P("// Default values for ", m.GoIdent, " fields.") |
| g.P("const (") |
| for _, s := range consts { |
| g.P(s) |
| } |
| g.P(")") |
| } |
| if len(vars) > 0 { |
| g.P("// Default values for ", m.GoIdent, " fields.") |
| g.P("var (") |
| for _, s := range vars { |
| g.P(s) |
| } |
| g.P(")") |
| } |
| g.P() |
| } |
| |
| func genMessageMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| genMessageBaseMethods(g, f, m) |
| genMessageGetterMethods(g, f, m) |
| genMessageSetterMethods(g, f, m) |
| } |
| |
| func genMessageBaseMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| // Reset method. |
| g.P("func (x *", m.GoIdent, ") Reset() {") |
| g.P("*x = ", m.GoIdent, "{}") |
| g.P("if ", protoimplPackage.Ident("UnsafeEnabled"), " {") |
| g.P("mi := &", messageTypesVarName(f), "[", f.allMessagesByPtr[m], "]") |
| g.P("ms := ", protoimplPackage.Ident("X"), ".MessageStateOf(", protoimplPackage.Ident("Pointer"), "(x))") |
| g.P("ms.StoreMessageInfo(mi)") |
| g.P("}") |
| g.P("}") |
| g.P() |
| |
| // String method. |
| g.P("func (x *", m.GoIdent, ") String() string {") |
| g.P("return ", protoimplPackage.Ident("X"), ".MessageStringOf(x)") |
| g.P("}") |
| g.P() |
| |
| // ProtoMessage method. |
| g.P("func (*", m.GoIdent, ") ProtoMessage() {}") |
| g.P() |
| |
| // ProtoReflect method. |
| genMessageReflectMethods(g, f, m) |
| |
| // Descriptor method. |
| if m.genRawDescMethod { |
| var indexes []string |
| for i := 1; i < len(m.Location.Path); i += 2 { |
| indexes = append(indexes, strconv.Itoa(int(m.Location.Path[i]))) |
| } |
| g.P("// Deprecated: Use ", m.GoIdent, ".ProtoReflect.Descriptor instead.") |
| g.P("func (*", m.GoIdent, ") Descriptor() ([]byte, []int) {") |
| g.P("return ", rawDescVarName(f), "GZIP(), []int{", strings.Join(indexes, ","), "}") |
| g.P("}") |
| g.P() |
| f.needRawDesc = true |
| } |
| } |
| |
| func genMessageGetterMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| for _, field := range m.Fields { |
| genNoInterfacePragma(g, m.isTracked) |
| |
| // Getter for parent oneof. |
| if oneof := field.Oneof; oneof != nil && oneof.Fields[0] == field && !oneof.Desc.IsSynthetic() { |
| g.Annotate(m.GoIdent.GoName+".Get"+oneof.GoName, oneof.Location) |
| g.P("func (m *", m.GoIdent.GoName, ") Get", oneof.GoName, "() ", oneofInterfaceName(oneof), " {") |
| g.P("if m != nil {") |
| g.P("return m.", oneof.GoName) |
| g.P("}") |
| g.P("return nil") |
| g.P("}") |
| g.P() |
| } |
| |
| // Getter for message field. |
| goType, pointer := fieldGoType(g, f, field) |
| defaultValue := fieldDefaultValue(g, f, m, field) |
| g.Annotate(m.GoIdent.GoName+".Get"+field.GoName, field.Location) |
| leadingComments := appendDeprecationSuffix("", |
| field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated()) |
| switch { |
| case field.Desc.IsWeak(): |
| g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", protoPackage.Ident("Message"), "{") |
| g.P("var w ", protoimplPackage.Ident("WeakFields")) |
| g.P("if x != nil {") |
| g.P("w = x.", genid.WeakFields_goname) |
| if m.isTracked { |
| g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName) |
| } |
| g.P("}") |
| g.P("return ", protoimplPackage.Ident("X"), ".GetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ")") |
| g.P("}") |
| case field.Oneof != nil && !field.Oneof.Desc.IsSynthetic(): |
| g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {") |
| g.P("if x, ok := x.Get", field.Oneof.GoName, "().(*", field.GoIdent, "); ok {") |
| g.P("return x.", field.GoName) |
| g.P("}") |
| g.P("return ", defaultValue) |
| g.P("}") |
| default: |
| g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {") |
| if !field.Desc.HasPresence() || defaultValue == "nil" { |
| g.P("if x != nil {") |
| } else { |
| g.P("if x != nil && x.", field.GoName, " != nil {") |
| } |
| star := "" |
| if pointer { |
| star = "*" |
| } |
| g.P("return ", star, " x.", field.GoName) |
| g.P("}") |
| g.P("return ", defaultValue) |
| g.P("}") |
| } |
| g.P() |
| } |
| } |
| |
| func genMessageSetterMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| for _, field := range m.Fields { |
| if !field.Desc.IsWeak() { |
| continue |
| } |
| |
| genNoInterfacePragma(g, m.isTracked) |
| |
| g.Annotate(m.GoIdent.GoName+".Set"+field.GoName, field.Location) |
| leadingComments := appendDeprecationSuffix("", |
| field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated()) |
| g.P(leadingComments, "func (x *", m.GoIdent, ") Set", field.GoName, "(v ", protoPackage.Ident("Message"), ") {") |
| g.P("var w *", protoimplPackage.Ident("WeakFields")) |
| g.P("if x != nil {") |
| g.P("w = &x.", genid.WeakFields_goname) |
| if m.isTracked { |
| g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName) |
| } |
| g.P("}") |
| g.P(protoimplPackage.Ident("X"), ".SetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ", v)") |
| g.P("}") |
| g.P() |
| } |
| } |
| |
| // fieldGoType returns the Go type used for a field. |
| // |
| // If it returns pointer=true, the struct field is a pointer to the type. |
| func fieldGoType(g *protogen.GeneratedFile, f *fileInfo, field *protogen.Field) (goType string, pointer bool) { |
| if field.Desc.IsWeak() { |
| return "struct{}", false |
| } |
| |
| pointer = field.Desc.HasPresence() |
| switch field.Desc.Kind() { |
| case protoreflect.BoolKind: |
| goType = "bool" |
| case protoreflect.EnumKind: |
| goType = g.QualifiedGoIdent(field.Enum.GoIdent) |
| case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind: |
| goType = "int32" |
| case protoreflect.Uint32Kind, protoreflect.Fixed32Kind: |
| goType = "uint32" |
| case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind: |
| goType = "int64" |
| case protoreflect.Uint64Kind, protoreflect.Fixed64Kind: |
| goType = "uint64" |
| case protoreflect.FloatKind: |
| goType = "float32" |
| case protoreflect.DoubleKind: |
| goType = "float64" |
| case protoreflect.StringKind: |
| goType = "string" |
| case protoreflect.BytesKind: |
| goType = "[]byte" |
| pointer = false // rely on nullability of slices for presence |
| case protoreflect.MessageKind, protoreflect.GroupKind: |
| goType = "*" + g.QualifiedGoIdent(field.Message.GoIdent) |
| pointer = false // pointer captured as part of the type |
| } |
| switch { |
| case field.Desc.IsList(): |
| return "[]" + goType, false |
| case field.Desc.IsMap(): |
| keyType, _ := fieldGoType(g, f, field.Message.Fields[0]) |
| valType, _ := fieldGoType(g, f, field.Message.Fields[1]) |
| return fmt.Sprintf("map[%v]%v", keyType, valType), false |
| } |
| return goType, pointer |
| } |
| |
| func fieldProtobufTagValue(field *protogen.Field) string { |
| var enumName string |
| if field.Desc.Kind() == protoreflect.EnumKind { |
| enumName = protoimpl.X.LegacyEnumName(field.Enum.Desc) |
| } |
| return tag.Marshal(field.Desc, enumName) |
| } |
| |
| func fieldDefaultValue(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, field *protogen.Field) string { |
| if field.Desc.IsList() { |
| return "nil" |
| } |
| if field.Desc.HasDefault() { |
| defVarName := "Default_" + m.GoIdent.GoName + "_" + field.GoName |
| if field.Desc.Kind() == protoreflect.BytesKind { |
| return "append([]byte(nil), " + defVarName + "...)" |
| } |
| return defVarName |
| } |
| switch field.Desc.Kind() { |
| case protoreflect.BoolKind: |
| return "false" |
| case protoreflect.StringKind: |
| return `""` |
| case protoreflect.MessageKind, protoreflect.GroupKind, protoreflect.BytesKind: |
| return "nil" |
| case protoreflect.EnumKind: |
| val := field.Enum.Values[0] |
| if val.GoIdent.GoImportPath == f.GoImportPath { |
| return g.QualifiedGoIdent(val.GoIdent) |
| } else { |
| // If the enum value is declared in a different Go package, |
| // reference it by number since the name may not be correct. |
| // See https://github.com/golang/protobuf/issues/513. |
| return g.QualifiedGoIdent(field.Enum.GoIdent) + "(" + strconv.FormatInt(int64(val.Desc.Number()), 10) + ")" |
| } |
| default: |
| return "0" |
| } |
| } |
| |
| func fieldJSONTagValue(field *protogen.Field) string { |
| return string(field.Desc.Name()) + ",omitempty" |
| } |
| |
| func genExtensions(g *protogen.GeneratedFile, f *fileInfo) { |
| if len(f.allExtensions) == 0 { |
| return |
| } |
| |
| g.P("var ", extensionTypesVarName(f), " = []", protoimplPackage.Ident("ExtensionInfo"), "{") |
| for _, x := range f.allExtensions { |
| g.P("{") |
| g.P("ExtendedType: (*", x.Extendee.GoIdent, ")(nil),") |
| goType, pointer := fieldGoType(g, f, x.Extension) |
| if pointer { |
| goType = "*" + goType |
| } |
| g.P("ExtensionType: (", goType, ")(nil),") |
| g.P("Field: ", x.Desc.Number(), ",") |
| g.P("Name: ", strconv.Quote(string(x.Desc.FullName())), ",") |
| g.P("Tag: ", strconv.Quote(fieldProtobufTagValue(x.Extension)), ",") |
| g.P("Filename: ", strconv.Quote(f.Desc.Path()), ",") |
| g.P("},") |
| } |
| g.P("}") |
| g.P() |
| |
| // Group extensions by the target message. |
| var orderedTargets []protogen.GoIdent |
| allExtensionsByTarget := make(map[protogen.GoIdent][]*extensionInfo) |
| allExtensionsByPtr := make(map[*extensionInfo]int) |
| for i, x := range f.allExtensions { |
| target := x.Extendee.GoIdent |
| if len(allExtensionsByTarget[target]) == 0 { |
| orderedTargets = append(orderedTargets, target) |
| } |
| allExtensionsByTarget[target] = append(allExtensionsByTarget[target], x) |
| allExtensionsByPtr[x] = i |
| } |
| for _, target := range orderedTargets { |
| g.P("// Extension fields to ", target, ".") |
| g.P("var (") |
| for _, x := range allExtensionsByTarget[target] { |
| xd := x.Desc |
| typeName := xd.Kind().String() |
| switch xd.Kind() { |
| case protoreflect.EnumKind: |
| typeName = string(xd.Enum().FullName()) |
| case protoreflect.MessageKind, protoreflect.GroupKind: |
| typeName = string(xd.Message().FullName()) |
| } |
| fieldName := string(xd.Name()) |
| |
| leadingComments := x.Comments.Leading |
| if leadingComments != "" { |
| leadingComments += "\n" |
| } |
| leadingComments += protogen.Comments(fmt.Sprintf(" %v %v %v = %v;\n", |
| xd.Cardinality(), typeName, fieldName, xd.Number())) |
| leadingComments = appendDeprecationSuffix(leadingComments, |
| x.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated()) |
| g.P(leadingComments, |
| "E_", x.GoIdent, " = &", extensionTypesVarName(f), "[", allExtensionsByPtr[x], "]", |
| trailingComment(x.Comments.Trailing)) |
| } |
| g.P(")") |
| g.P() |
| } |
| } |
| |
| // genMessageOneofWrapperTypes generates the oneof wrapper types and |
| // associates the types with the parent message type. |
| func genMessageOneofWrapperTypes(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) { |
| for _, oneof := range m.Oneofs { |
| if oneof.Desc.IsSynthetic() { |
| continue |
| } |
| ifName := oneofInterfaceName(oneof) |
| g.P("type ", ifName, " interface {") |
| g.P(ifName, "()") |
| g.P("}") |
| g.P() |
| for _, field := range oneof.Fields { |
| g.Annotate(field.GoIdent.GoName, field.Location) |
| g.Annotate(field.GoIdent.GoName+"."+field.GoName, field.Location) |
| g.P("type ", field.GoIdent, " struct {") |
| goType, _ := fieldGoType(g, f, field) |
| tags := structTags{ |
| {"protobuf", fieldProtobufTagValue(field)}, |
| } |
| if m.isTracked { |
| tags = append(tags, gotrackTags...) |
| } |
| leadingComments := appendDeprecationSuffix(field.Comments.Leading, |
| field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated()) |
| g.P(leadingComments, |
| field.GoName, " ", goType, tags, |
| trailingComment(field.Comments.Trailing)) |
| g.P("}") |
| g.P() |
| } |
| for _, field := range oneof.Fields { |
| g.P("func (*", field.GoIdent, ") ", ifName, "() {}") |
| g.P() |
| } |
| } |
| } |
| |
| // oneofInterfaceName returns the name of the interface type implemented by |
| // the oneof field value types. |
| func oneofInterfaceName(oneof *protogen.Oneof) string { |
| return "is" + oneof.GoIdent.GoName |
| } |
| |
| // genNoInterfacePragma generates a standalone "nointerface" pragma to |
| // decorate methods with field-tracking support. |
| func genNoInterfacePragma(g *protogen.GeneratedFile, tracked bool) { |
| if tracked { |
| g.P("//go:nointerface") |
| g.P() |
| } |
| } |
| |
| var gotrackTags = structTags{{"go", "track"}} |
| |
| // structTags is a data structure for build idiomatic Go struct tags. |
| // Each [2]string is a key-value pair, where value is the unescaped string. |
| // |
| // Example: structTags{{"key", "value"}}.String() -> `key:"value"` |
| type structTags [][2]string |
| |
| func (tags structTags) String() string { |
| if len(tags) == 0 { |
| return "" |
| } |
| var ss []string |
| for _, tag := range tags { |
| // NOTE: When quoting the value, we need to make sure the backtick |
| // character does not appear. Convert all cases to the escaped hex form. |
| key := tag[0] |
| val := strings.Replace(strconv.Quote(tag[1]), "`", `\x60`, -1) |
| ss = append(ss, fmt.Sprintf("%s:%s", key, val)) |
| } |
| return "`" + strings.Join(ss, " ") + "`" |
| } |
| |
| // appendDeprecationSuffix optionally appends a deprecation notice as a suffix. |
| func appendDeprecationSuffix(prefix protogen.Comments, deprecated bool) protogen.Comments { |
| if !deprecated { |
| return prefix |
| } |
| if prefix != "" { |
| prefix += "\n" |
| } |
| return prefix + " Deprecated: Do not use.\n" |
| } |
| |
| // trailingComment is like protogen.Comments, but lacks a trailing newline. |
| type trailingComment protogen.Comments |
| |
| func (c trailingComment) String() string { |
| s := strings.TrimSuffix(protogen.Comments(c).String(), "\n") |
| if strings.Contains(s, "\n") { |
| // We don't support multi-lined trailing comments as it is unclear |
| // how to best render them in the generated code. |
| return "" |
| } |
| return s |
| } |