415 lines
12 KiB
Go
415 lines
12 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package descfmt provides functionality to format descriptors.
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package descfmt
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import (
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"fmt"
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"io"
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"reflect"
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"strconv"
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"strings"
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"google.golang.org/protobuf/internal/detrand"
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"google.golang.org/protobuf/internal/pragma"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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type list interface {
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Len() int
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pragma.DoNotImplement
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}
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func FormatList(s fmt.State, r rune, vs list) {
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io.WriteString(s, formatListOpt(vs, true, r == 'v' && (s.Flag('+') || s.Flag('#'))))
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}
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func formatListOpt(vs list, isRoot, allowMulti bool) string {
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start, end := "[", "]"
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if isRoot {
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var name string
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switch vs.(type) {
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case protoreflect.Names:
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name = "Names"
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case protoreflect.FieldNumbers:
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name = "FieldNumbers"
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case protoreflect.FieldRanges:
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name = "FieldRanges"
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case protoreflect.EnumRanges:
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name = "EnumRanges"
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case protoreflect.FileImports:
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name = "FileImports"
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case protoreflect.Descriptor:
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name = reflect.ValueOf(vs).MethodByName("Get").Type().Out(0).Name() + "s"
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default:
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name = reflect.ValueOf(vs).Elem().Type().Name()
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}
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start, end = name+"{", "}"
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}
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var ss []string
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switch vs := vs.(type) {
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case protoreflect.Names:
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for i := 0; i < vs.Len(); i++ {
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ss = append(ss, fmt.Sprint(vs.Get(i)))
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}
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return start + joinStrings(ss, false) + end
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case protoreflect.FieldNumbers:
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for i := 0; i < vs.Len(); i++ {
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ss = append(ss, fmt.Sprint(vs.Get(i)))
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}
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return start + joinStrings(ss, false) + end
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case protoreflect.FieldRanges:
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for i := 0; i < vs.Len(); i++ {
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r := vs.Get(i)
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if r[0]+1 == r[1] {
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ss = append(ss, fmt.Sprintf("%d", r[0]))
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} else {
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ss = append(ss, fmt.Sprintf("%d:%d", r[0], r[1])) // enum ranges are end exclusive
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}
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}
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return start + joinStrings(ss, false) + end
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case protoreflect.EnumRanges:
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for i := 0; i < vs.Len(); i++ {
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r := vs.Get(i)
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if r[0] == r[1] {
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ss = append(ss, fmt.Sprintf("%d", r[0]))
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} else {
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ss = append(ss, fmt.Sprintf("%d:%d", r[0], int64(r[1])+1)) // enum ranges are end inclusive
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}
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}
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return start + joinStrings(ss, false) + end
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case protoreflect.FileImports:
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for i := 0; i < vs.Len(); i++ {
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var rs records
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rv := reflect.ValueOf(vs.Get(i))
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Path"), "Path"},
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{rv.MethodByName("Package"), "Package"},
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{rv.MethodByName("IsPublic"), "IsPublic"},
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{rv.MethodByName("IsWeak"), "IsWeak"},
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}...)
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ss = append(ss, "{"+rs.Join()+"}")
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}
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return start + joinStrings(ss, allowMulti) + end
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default:
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_, isEnumValue := vs.(protoreflect.EnumValueDescriptors)
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for i := 0; i < vs.Len(); i++ {
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m := reflect.ValueOf(vs).MethodByName("Get")
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v := m.Call([]reflect.Value{reflect.ValueOf(i)})[0].Interface()
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ss = append(ss, formatDescOpt(v.(protoreflect.Descriptor), false, allowMulti && !isEnumValue, nil))
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}
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return start + joinStrings(ss, allowMulti && isEnumValue) + end
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}
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}
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type methodAndName struct {
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method reflect.Value
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name string
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}
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func FormatDesc(s fmt.State, r rune, t protoreflect.Descriptor) {
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io.WriteString(s, formatDescOpt(t, true, r == 'v' && (s.Flag('+') || s.Flag('#')), nil))
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}
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func InternalFormatDescOptForTesting(t protoreflect.Descriptor, isRoot, allowMulti bool, record func(string)) string {
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return formatDescOpt(t, isRoot, allowMulti, record)
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}
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func formatDescOpt(t protoreflect.Descriptor, isRoot, allowMulti bool, record func(string)) string {
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rv := reflect.ValueOf(t)
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rt := rv.MethodByName("ProtoType").Type().In(0)
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start, end := "{", "}"
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if isRoot {
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start = rt.Name() + "{"
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}
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_, isFile := t.(protoreflect.FileDescriptor)
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rs := records{
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allowMulti: allowMulti,
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record: record,
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}
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if t.IsPlaceholder() {
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if isFile {
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Path"), "Path"},
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{rv.MethodByName("Package"), "Package"},
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{rv.MethodByName("IsPlaceholder"), "IsPlaceholder"},
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}...)
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} else {
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("FullName"), "FullName"},
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{rv.MethodByName("IsPlaceholder"), "IsPlaceholder"},
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}...)
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}
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} else {
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switch {
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case isFile:
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rs.Append(rv, methodAndName{rv.MethodByName("Syntax"), "Syntax"})
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case isRoot:
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Syntax"), "Syntax"},
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{rv.MethodByName("FullName"), "FullName"},
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}...)
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default:
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rs.Append(rv, methodAndName{rv.MethodByName("Name"), "Name"})
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}
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switch t := t.(type) {
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case protoreflect.FieldDescriptor:
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accessors := []methodAndName{
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{rv.MethodByName("Number"), "Number"},
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{rv.MethodByName("Cardinality"), "Cardinality"},
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{rv.MethodByName("Kind"), "Kind"},
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{rv.MethodByName("HasJSONName"), "HasJSONName"},
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{rv.MethodByName("JSONName"), "JSONName"},
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{rv.MethodByName("HasPresence"), "HasPresence"},
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{rv.MethodByName("IsExtension"), "IsExtension"},
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{rv.MethodByName("IsPacked"), "IsPacked"},
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{rv.MethodByName("IsWeak"), "IsWeak"},
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{rv.MethodByName("IsList"), "IsList"},
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{rv.MethodByName("IsMap"), "IsMap"},
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{rv.MethodByName("MapKey"), "MapKey"},
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{rv.MethodByName("MapValue"), "MapValue"},
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{rv.MethodByName("HasDefault"), "HasDefault"},
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{rv.MethodByName("Default"), "Default"},
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{rv.MethodByName("ContainingOneof"), "ContainingOneof"},
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{rv.MethodByName("ContainingMessage"), "ContainingMessage"},
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{rv.MethodByName("Message"), "Message"},
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{rv.MethodByName("Enum"), "Enum"},
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}
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for _, s := range accessors {
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switch s.name {
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case "MapKey":
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if k := t.MapKey(); k != nil {
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rs.recs = append(rs.recs, [2]string{"MapKey", k.Kind().String()})
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}
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case "MapValue":
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if v := t.MapValue(); v != nil {
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switch v.Kind() {
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case protoreflect.EnumKind:
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rs.AppendRecs("MapValue", [2]string{"MapValue", string(v.Enum().FullName())})
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case protoreflect.MessageKind, protoreflect.GroupKind:
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rs.AppendRecs("MapValue", [2]string{"MapValue", string(v.Message().FullName())})
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default:
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rs.AppendRecs("MapValue", [2]string{"MapValue", v.Kind().String()})
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}
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}
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case "ContainingOneof":
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if od := t.ContainingOneof(); od != nil {
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rs.AppendRecs("ContainingOneof", [2]string{"Oneof", string(od.Name())})
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}
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case "ContainingMessage":
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if t.IsExtension() {
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rs.AppendRecs("ContainingMessage", [2]string{"Extendee", string(t.ContainingMessage().FullName())})
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}
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case "Message":
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if !t.IsMap() {
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rs.Append(rv, s)
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}
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default:
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rs.Append(rv, s)
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}
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}
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case protoreflect.OneofDescriptor:
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var ss []string
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fs := t.Fields()
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for i := 0; i < fs.Len(); i++ {
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ss = append(ss, string(fs.Get(i).Name()))
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}
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if len(ss) > 0 {
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rs.AppendRecs("Fields", [2]string{"Fields", "[" + joinStrings(ss, false) + "]"})
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}
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case protoreflect.FileDescriptor:
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Path"), "Path"},
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{rv.MethodByName("Package"), "Package"},
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{rv.MethodByName("Imports"), "Imports"},
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{rv.MethodByName("Messages"), "Messages"},
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{rv.MethodByName("Enums"), "Enums"},
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{rv.MethodByName("Extensions"), "Extensions"},
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{rv.MethodByName("Services"), "Services"},
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}...)
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case protoreflect.MessageDescriptor:
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("IsMapEntry"), "IsMapEntry"},
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{rv.MethodByName("Fields"), "Fields"},
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{rv.MethodByName("Oneofs"), "Oneofs"},
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{rv.MethodByName("ReservedNames"), "ReservedNames"},
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{rv.MethodByName("ReservedRanges"), "ReservedRanges"},
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{rv.MethodByName("RequiredNumbers"), "RequiredNumbers"},
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{rv.MethodByName("ExtensionRanges"), "ExtensionRanges"},
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{rv.MethodByName("Messages"), "Messages"},
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{rv.MethodByName("Enums"), "Enums"},
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{rv.MethodByName("Extensions"), "Extensions"},
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}...)
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case protoreflect.EnumDescriptor:
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Values"), "Values"},
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{rv.MethodByName("ReservedNames"), "ReservedNames"},
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{rv.MethodByName("ReservedRanges"), "ReservedRanges"},
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{rv.MethodByName("IsClosed"), "IsClosed"},
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}...)
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case protoreflect.EnumValueDescriptor:
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Number"), "Number"},
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}...)
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case protoreflect.ServiceDescriptor:
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Methods"), "Methods"},
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}...)
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case protoreflect.MethodDescriptor:
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rs.Append(rv, []methodAndName{
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{rv.MethodByName("Input"), "Input"},
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{rv.MethodByName("Output"), "Output"},
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{rv.MethodByName("IsStreamingClient"), "IsStreamingClient"},
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{rv.MethodByName("IsStreamingServer"), "IsStreamingServer"},
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}...)
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}
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if m := rv.MethodByName("GoType"); m.IsValid() {
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rs.Append(rv, methodAndName{m, "GoType"})
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}
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}
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return start + rs.Join() + end
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}
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type records struct {
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recs [][2]string
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allowMulti bool
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// record is a function that will be called for every Append() or
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// AppendRecs() call, to be used for testing with the
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// InternalFormatDescOptForTesting function.
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record func(string)
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}
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func (rs *records) AppendRecs(fieldName string, newRecs [2]string) {
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if rs.record != nil {
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rs.record(fieldName)
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}
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rs.recs = append(rs.recs, newRecs)
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}
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func (rs *records) Append(v reflect.Value, accessors ...methodAndName) {
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for _, a := range accessors {
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if rs.record != nil {
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rs.record(a.name)
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}
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var rv reflect.Value
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if a.method.IsValid() {
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rv = a.method.Call(nil)[0]
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}
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if v.Kind() == reflect.Struct && !rv.IsValid() {
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rv = v.FieldByName(a.name)
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}
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if !rv.IsValid() {
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panic(fmt.Sprintf("unknown accessor: %v.%s", v.Type(), a.name))
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}
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if _, ok := rv.Interface().(protoreflect.Value); ok {
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rv = rv.MethodByName("Interface").Call(nil)[0]
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if !rv.IsNil() {
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rv = rv.Elem()
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}
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}
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// Ignore zero values.
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var isZero bool
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switch rv.Kind() {
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case reflect.Interface, reflect.Slice:
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isZero = rv.IsNil()
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case reflect.Bool:
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isZero = rv.Bool() == false
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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isZero = rv.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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isZero = rv.Uint() == 0
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case reflect.String:
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isZero = rv.String() == ""
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}
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if n, ok := rv.Interface().(list); ok {
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isZero = n.Len() == 0
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}
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if isZero {
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continue
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}
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// Format the value.
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var s string
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v := rv.Interface()
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switch v := v.(type) {
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case list:
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s = formatListOpt(v, false, rs.allowMulti)
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case protoreflect.FieldDescriptor, protoreflect.OneofDescriptor, protoreflect.EnumValueDescriptor, protoreflect.MethodDescriptor:
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s = string(v.(protoreflect.Descriptor).Name())
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case protoreflect.Descriptor:
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s = string(v.FullName())
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case string:
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s = strconv.Quote(v)
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case []byte:
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s = fmt.Sprintf("%q", v)
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default:
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s = fmt.Sprint(v)
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}
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rs.recs = append(rs.recs, [2]string{a.name, s})
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}
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}
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func (rs *records) Join() string {
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var ss []string
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// In single line mode, simply join all records with commas.
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if !rs.allowMulti {
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for _, r := range rs.recs {
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ss = append(ss, r[0]+formatColon(0)+r[1])
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}
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return joinStrings(ss, false)
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}
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// In allowMulti line mode, align single line records for more readable output.
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var maxLen int
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flush := func(i int) {
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for _, r := range rs.recs[len(ss):i] {
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ss = append(ss, r[0]+formatColon(maxLen-len(r[0]))+r[1])
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}
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maxLen = 0
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}
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for i, r := range rs.recs {
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if isMulti := strings.Contains(r[1], "\n"); isMulti {
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flush(i)
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ss = append(ss, r[0]+formatColon(0)+strings.Join(strings.Split(r[1], "\n"), "\n\t"))
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} else if maxLen < len(r[0]) {
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maxLen = len(r[0])
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}
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}
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flush(len(rs.recs))
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return joinStrings(ss, true)
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}
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func formatColon(padding int) string {
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// Deliberately introduce instability into the debug output to
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// discourage users from performing string comparisons.
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// This provides us flexibility to change the output in the future.
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if detrand.Bool() {
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return ":" + strings.Repeat(" ", 1+padding) // use non-breaking spaces (U+00a0)
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} else {
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return ":" + strings.Repeat(" ", 1+padding) // use regular spaces (U+0020)
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}
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}
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func joinStrings(ss []string, isMulti bool) string {
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if len(ss) == 0 {
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return ""
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}
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if isMulti {
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return "\n\t" + strings.Join(ss, "\n\t") + "\n"
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}
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return strings.Join(ss, ", ")
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}
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