294 lines
9.7 KiB
Go
294 lines
9.7 KiB
Go
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// Copyright (c) 2013, Vastech SA (PTY) LTD. 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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/*
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The stringer plugin generates a String method for each message.
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It is enabled by the following extensions:
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- stringer
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- stringer_all
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The stringer plugin also generates a test given it is enabled using one of the following extensions:
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- testgen
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- testgen_all
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Let us look at:
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github.com/gogo/protobuf/test/example/example.proto
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Btw all the output can be seen at:
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github.com/gogo/protobuf/test/example/*
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The following message:
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option (gogoproto.goproto_stringer_all) = false;
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option (gogoproto.stringer_all) = true;
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message A {
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optional string Description = 1 [(gogoproto.nullable) = false];
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optional int64 Number = 2 [(gogoproto.nullable) = false];
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optional bytes Id = 3 [(gogoproto.customtype) = "github.com/gogo/protobuf/test/custom.Uuid", (gogoproto.nullable) = false];
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}
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given to the stringer stringer, will generate the following code:
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func (this *A) String() string {
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if this == nil {
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return "nil"
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}
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s := strings.Join([]string{`&A{`,
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`Description:` + fmt.Sprintf("%v", this.Description) + `,`,
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`Number:` + fmt.Sprintf("%v", this.Number) + `,`,
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`Id:` + fmt.Sprintf("%v", this.Id) + `,`,
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`XXX_unrecognized:` + fmt.Sprintf("%v", this.XXX_unrecognized) + `,`,
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`}`,
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}, "")
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return s
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}
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and the following test code:
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func TestAStringer(t *testing4.T) {
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popr := math_rand4.New(math_rand4.NewSource(time4.Now().UnixNano()))
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p := NewPopulatedA(popr, false)
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s1 := p.String()
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s2 := fmt1.Sprintf("%v", p)
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if s1 != s2 {
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t.Fatalf("String want %v got %v", s1, s2)
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}
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}
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Typically fmt.Printf("%v") will stop to print when it reaches a pointer and
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not print their values, while the generated String method will always print all values, recursively.
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*/
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package stringer
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import (
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"github.com/gogo/protobuf/gogoproto"
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"github.com/gogo/protobuf/protoc-gen-gogo/generator"
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"strings"
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)
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type stringer struct {
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*generator.Generator
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generator.PluginImports
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atleastOne bool
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localName string
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}
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func NewStringer() *stringer {
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return &stringer{}
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}
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func (p *stringer) Name() string {
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return "stringer"
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}
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func (p *stringer) Init(g *generator.Generator) {
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p.Generator = g
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}
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func (p *stringer) Generate(file *generator.FileDescriptor) {
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proto3 := gogoproto.IsProto3(file.FileDescriptorProto)
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p.PluginImports = generator.NewPluginImports(p.Generator)
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p.atleastOne = false
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p.localName = generator.FileName(file)
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fmtPkg := p.NewImport("fmt")
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stringsPkg := p.NewImport("strings")
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reflectPkg := p.NewImport("reflect")
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sortKeysPkg := p.NewImport("github.com/gogo/protobuf/sortkeys")
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for _, message := range file.Messages() {
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if !gogoproto.IsStringer(file.FileDescriptorProto, message.DescriptorProto) {
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continue
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}
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if gogoproto.EnabledGoStringer(file.FileDescriptorProto, message.DescriptorProto) {
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panic("old string method needs to be disabled, please use gogoproto.goproto_stringer or gogoproto.goproto_stringer_all and set it to false")
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}
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if message.DescriptorProto.GetOptions().GetMapEntry() {
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continue
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}
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p.atleastOne = true
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ccTypeName := generator.CamelCaseSlice(message.TypeName())
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p.P(`func (this *`, ccTypeName, `) String() string {`)
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p.In()
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p.P(`if this == nil {`)
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p.In()
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p.P(`return "nil"`)
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p.Out()
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p.P(`}`)
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for _, field := range message.Field {
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if !p.IsMap(field) {
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continue
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}
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fieldname := p.GetFieldName(message, field)
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m := p.GoMapType(nil, field)
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mapgoTyp, keyField, keyAliasField := m.GoType, m.KeyField, m.KeyAliasField
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keysName := `keysFor` + fieldname
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keygoTyp, _ := p.GoType(nil, keyField)
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keygoTyp = strings.Replace(keygoTyp, "*", "", 1)
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keygoAliasTyp, _ := p.GoType(nil, keyAliasField)
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keygoAliasTyp = strings.Replace(keygoAliasTyp, "*", "", 1)
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keyCapTyp := generator.CamelCase(keygoTyp)
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p.P(keysName, ` := make([]`, keygoTyp, `, 0, len(this.`, fieldname, `))`)
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p.P(`for k, _ := range this.`, fieldname, ` {`)
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p.In()
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if keygoAliasTyp == keygoTyp {
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p.P(keysName, ` = append(`, keysName, `, k)`)
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} else {
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p.P(keysName, ` = append(`, keysName, `, `, keygoTyp, `(k))`)
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}
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p.Out()
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p.P(`}`)
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p.P(sortKeysPkg.Use(), `.`, keyCapTyp, `s(`, keysName, `)`)
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mapName := `mapStringFor` + fieldname
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p.P(mapName, ` := "`, mapgoTyp, `{"`)
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p.P(`for _, k := range `, keysName, ` {`)
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p.In()
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if keygoAliasTyp == keygoTyp {
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p.P(mapName, ` += fmt.Sprintf("%v: %v,", k, this.`, fieldname, `[k])`)
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} else {
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p.P(mapName, ` += fmt.Sprintf("%v: %v,", k, this.`, fieldname, `[`, keygoAliasTyp, `(k)])`)
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}
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p.Out()
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p.P(`}`)
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p.P(mapName, ` += "}"`)
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}
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p.P("s := ", stringsPkg.Use(), ".Join([]string{`&", ccTypeName, "{`,")
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oneofs := make(map[string]struct{})
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for _, field := range message.Field {
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nullable := gogoproto.IsNullable(field)
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repeated := field.IsRepeated()
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fieldname := p.GetFieldName(message, field)
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oneof := field.OneofIndex != nil
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if oneof {
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if _, ok := oneofs[fieldname]; ok {
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continue
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} else {
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oneofs[fieldname] = struct{}{}
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}
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p.P("`", fieldname, ":`", ` + `, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, ") + `,", "`,")
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} else if p.IsMap(field) {
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mapName := `mapStringFor` + fieldname
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p.P("`", fieldname, ":`", ` + `, mapName, " + `,", "`,")
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} else if field.IsMessage() || p.IsGroup(field) {
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desc := p.ObjectNamed(field.GetTypeName())
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msgname := p.TypeName(desc)
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msgnames := strings.Split(msgname, ".")
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typeName := msgnames[len(msgnames)-1]
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if nullable {
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p.P("`", fieldname, ":`", ` + `, stringsPkg.Use(), `.Replace(`, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, `), "`, typeName, `","`, msgname, `"`, ", 1) + `,", "`,")
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} else if repeated {
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p.P("`", fieldname, ":`", ` + `, stringsPkg.Use(), `.Replace(`, stringsPkg.Use(), `.Replace(`, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, `), "`, typeName, `","`, msgname, `"`, ", 1),`&`,``,1) + `,", "`,")
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} else {
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p.P("`", fieldname, ":`", ` + `, stringsPkg.Use(), `.Replace(`, stringsPkg.Use(), `.Replace(this.`, fieldname, `.String(), "`, typeName, `","`, msgname, `"`, ", 1),`&`,``,1) + `,", "`,")
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}
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} else {
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if nullable && !repeated && !proto3 {
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p.P("`", fieldname, ":`", ` + valueToString`, p.localName, `(this.`, fieldname, ") + `,", "`,")
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} else {
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p.P("`", fieldname, ":`", ` + `, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, ") + `,", "`,")
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}
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}
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}
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if message.DescriptorProto.HasExtension() {
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if gogoproto.HasExtensionsMap(file.FileDescriptorProto, message.DescriptorProto) {
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p.P("`XXX_extensions:` + proto.StringFromExtensionsMap(this.XXX_extensions) + `,`,")
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} else {
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p.P("`XXX_extensions:` + proto.StringFromExtensionsBytes(this.XXX_extensions) + `,`,")
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}
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}
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if gogoproto.HasUnrecognized(file.FileDescriptorProto, message.DescriptorProto) {
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p.P("`XXX_unrecognized:` + ", fmtPkg.Use(), `.Sprintf("%v", this.XXX_unrecognized) + `, "`,`,")
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}
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p.P("`}`,")
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p.P(`}`, `,""`, ")")
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p.P(`return s`)
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p.Out()
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p.P(`}`)
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//Generate String methods for oneof fields
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for _, field := range message.Field {
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oneof := field.OneofIndex != nil
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if !oneof {
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continue
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}
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ccTypeName := p.OneOfTypeName(message, field)
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p.P(`func (this *`, ccTypeName, `) String() string {`)
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p.In()
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p.P(`if this == nil {`)
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p.In()
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p.P(`return "nil"`)
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p.Out()
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p.P(`}`)
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p.P("s := ", stringsPkg.Use(), ".Join([]string{`&", ccTypeName, "{`,")
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fieldname := p.GetOneOfFieldName(message, field)
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if field.IsMessage() || p.IsGroup(field) {
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desc := p.ObjectNamed(field.GetTypeName())
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msgname := p.TypeName(desc)
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msgnames := strings.Split(msgname, ".")
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typeName := msgnames[len(msgnames)-1]
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p.P("`", fieldname, ":`", ` + `, stringsPkg.Use(), `.Replace(`, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, `), "`, typeName, `","`, msgname, `"`, ", 1) + `,", "`,")
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} else {
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p.P("`", fieldname, ":`", ` + `, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, ") + `,", "`,")
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}
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p.P("`}`,")
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p.P(`}`, `,""`, ")")
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p.P(`return s`)
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p.Out()
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p.P(`}`)
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}
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}
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if !p.atleastOne {
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return
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}
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p.P(`func valueToString`, p.localName, `(v interface{}) string {`)
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p.In()
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p.P(`rv := `, reflectPkg.Use(), `.ValueOf(v)`)
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p.P(`if rv.IsNil() {`)
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p.In()
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p.P(`return "nil"`)
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p.Out()
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p.P(`}`)
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p.P(`pv := `, reflectPkg.Use(), `.Indirect(rv).Interface()`)
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p.P(`return `, fmtPkg.Use(), `.Sprintf("*%v", pv)`)
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p.Out()
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p.P(`}`)
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}
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func init() {
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generator.RegisterPlugin(NewStringer())
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}
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