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generator.go
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generator.go
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package internal
// TODO: add nested messages support
// TODO: add nested enum support
import (
"bytes"
"fmt"
"html/template"
"log"
"os"
"path/filepath"
"sort"
"strings"
"github.com/Masterminds/sprig"
"github.com/davecgh/go-spew/spew"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/protoc-gen-go/descriptor"
plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
"github.com/jhump/protoreflect/desc"
)
const indent = " "
type MessageOptionsFunc = func(*desc.MessageDescriptor) MessageOptions
type FieldOptionsFunc = func(MessageOptions, *desc.FieldDescriptor) FieldOptions
type Parameters struct {
AsyncIterators bool
OutputNamePattern string
DumpRequestDescriptor bool
EnumsAsInt bool
OriginalNames bool
Verbose int
Int64AsString bool
// TODO: allow template specification?
MessageOptionsFunc MessageOptionsFunc
FieldOptionsFunc FieldOptionsFunc
}
type Generator struct {
*bytes.Buffer
indent string
Request *plugin.CodeGeneratorRequest
Response *plugin.CodeGeneratorResponse
usedPackages map[string]bool // Use this map to track which package has been used in one TS file.
}
type OutputNameContext struct {
Dir string
BaseName string
Descriptor *desc.FileDescriptor
Request *plugin.CodeGeneratorRequest
}
type MessageOptions struct {
DefaultFieldOptions *FieldOptions
}
type FieldOptions struct {
IsRequired bool
}
// Create a new Generator
func New() *Generator {
return &Generator{
Buffer: new(bytes.Buffer),
Request: new(plugin.CodeGeneratorRequest),
Response: new(plugin.CodeGeneratorResponse),
}
}
func (g *Generator) incIndent() {
g.indent += indent
}
func (g *Generator) decIndent() {
g.indent = string(g.indent[:len(g.indent)-len(indent)])
}
// WriteLine is used to add one line into the buffer
func (g *Generator) WriteLine(s string) {
g.Buffer.WriteString(g.indent)
g.Buffer.WriteString(s)
g.Buffer.WriteString("\n")
}
// W is an alias for WriteLine
func (g *Generator) W(s string) {
g.WriteLine(s)
}
func (g *Generator) writeComment(s string) {
if s != "" {
for _, line := range strings.Split(strings.TrimSuffix(s, "\n"), "\n") {
g.W(fmt.Sprintf("//%s", line))
}
}
}
var s = &spew.ConfigState{
Indent: " ",
DisableMethods: true,
SortKeys: true,
SpewKeys: true,
MaxDepth: 12,
DisablePointerAddresses: true,
DisableCapacities: true,
}
func genName(r *plugin.CodeGeneratorRequest, f *desc.FileDescriptor, outPattern string) string {
// TODO: consider using go_package if present?
n := filepath.Base(f.GetName())
if strings.HasSuffix(n, ".proto") {
n = n[:len(n)-len(".proto")]
}
ctx := &OutputNameContext{
Dir: filepath.Dir(f.GetName()),
BaseName: n,
Descriptor: f,
Request: r,
}
var t = template.Must(template.New("gentstypes/generator.go:genName").Funcs(sprig.FuncMap()).Parse(outPattern))
buf := new(bytes.Buffer)
if err := t.Execute(buf, ctx); err != nil {
log.Fatalln("issue rendering template:", err)
}
return buf.String()
}
func (g *Generator) GenerateAllFiles(params *Parameters) {
files, err := desc.CreateFileDescriptors(g.Request.ProtoFile)
if params.DumpRequestDescriptor {
s.Fdump(os.Stderr, g.Request)
}
if err != nil {
log.Fatal(err)
}
names := []string{}
for _, fname := range g.Request.FileToGenerate {
names = append(names, fname)
}
sort.Strings(names)
for _, n := range names {
f := files[n]
g.W("// Code generated by protoc-gen-typescript. DO NOT EDIT.\n")
g.generate(f, params)
}
}
func (g *Generator) generate(f *desc.FileDescriptor, params *Parameters) {
g.usedPackages = make(map[string]bool)
g.generateEnums(f.GetEnumTypes(), params)
g.generateMessages(f.GetMessageTypes(), params)
g.generateServices(f.GetServices(), params)
str := g.Buffer.String()
g.Buffer.Reset()
g.generateDependencies(f, f.GetDependencies(), params)
g.Buffer.WriteString(str)
n := genName(g.Request, f, params.OutputNamePattern)
if params.Verbose > 0 {
fmt.Fprintln(os.Stderr, "generating", n)
}
g.Response.File = append(g.Response.File, &plugin.CodeGeneratorResponse_File{
Name: proto.String(n),
Content: proto.String(g.String()),
})
g.Buffer.Reset()
g.usedPackages = make(map[string]bool)
}
func (g *Generator) generateDependencies(baseFile *desc.FileDescriptor, dependencies []*desc.FileDescriptor, params *Parameters) {
for _, d := range dependencies {
importLine := fmt.Sprintf(`import * as %s from "%s"`, formatImportModule(d), formatImportFile(baseFile, d))
if used, ok := g.usedPackages[d.GetPackage()]; ok && used {
g.W(importLine)
} else {
g.W(fmt.Sprintf(`// %s // imported but not used`, importLine))
}
}
if len(dependencies) > 0 {
g.W("") // add a new line after imports
}
}
func (g *Generator) generateMessages(messages []*desc.MessageDescriptor, params *Parameters) {
for _, m := range messages {
g.generateMessage(m, params)
}
}
func (g *Generator) generateEnums(enums []*desc.EnumDescriptor, params *Parameters) {
for _, e := range enums {
g.generateEnum(e, params)
}
}
func (g *Generator) generateServices(services []*desc.ServiceDescriptor, params *Parameters) {
for _, e := range services {
g.generateService(e, params)
}
}
/*
generateMessageInterface is used to generate TypeScript interface:
export interface MyMessage {
id?: string;
}
*/
func (g *Generator) generateMessageInterface(m *desc.MessageDescriptor, params *Parameters) {
name := m.GetName()
g.writeComment(m.GetSourceInfo().GetLeadingComments())
g.W(fmt.Sprintf("export interface %s {", name))
for _, f := range m.GetFields() {
name := f.GetName()
if !params.OriginalNames {
name = f.GetJSONName()
}
required := false
suffix := ""
if !required {
suffix = "?"
}
g.incIndent()
g.writeComment(f.GetSourceInfo().GetLeadingComments())
g.decIndent()
trailingComment := ""
if comment := f.GetSourceInfo().GetTrailingComments(); comment != "" {
trailingComment = " // " + strings.TrimSpace(comment)
}
g.W(fmt.Sprintf(indent+"%s%s: %s;%s", name, suffix, fieldType(f, params, g.usedPackages), trailingComment))
}
g.W("}\n")
}
/*
generateMessageNamespace is used to generate TypeScript namespace:
export namespace MyMessage {
id?: string;
child?: SubMessage;
export interface SubMessage {
id?: string;
}
export namespace SubMessage {
...
}
}
*/
func (g *Generator) generateMessageNamespace(m *desc.MessageDescriptor, params *Parameters) {
name := m.GetName()
nestedEnumTypes := m.GetNestedEnumTypes()
nestedMessageTypes := m.GetNestedMessageTypes()
// If there is not nested object, don't write the namespace
if len(nestedEnumTypes) == 0 && len(nestedMessageTypes) == 0 {
return
}
g.W(fmt.Sprintf("export namespace %s {", name))
g.incIndent()
for _, e := range nestedEnumTypes {
g.generateEnum(e, params)
}
for _, m := range nestedMessageTypes {
g.generateMessage(m, params)
}
g.decIndent()
g.W("}\n")
}
func (g *Generator) generateMessage(m *desc.MessageDescriptor, params *Parameters) {
g.generateMessageInterface(m, params)
g.generateMessageNamespace(m, params)
}
func fieldType(f *desc.FieldDescriptor, params *Parameters, usedPackages map[string]bool) string {
t := rawFieldType(f, params, usedPackages)
if f.IsMap() {
return fmt.Sprintf("{ [key: %s]: %s }", rawFieldType(f.GetMapKeyType(), params, usedPackages), rawFieldType(f.GetMapValueType(), params, usedPackages))
}
if f.IsRepeated() {
return fmt.Sprintf("Array<%s>", t)
}
return t
}
func rawFieldType(f *desc.FieldDescriptor, params *Parameters, usedPackages map[string]bool) string {
switch f.GetType() {
case descriptor.FieldDescriptorProto_TYPE_DOUBLE:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_FLOAT:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_INT32:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_UINT32:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_FIXED32:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_SFIXED32:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_SINT32:
return "number"
case descriptor.FieldDescriptorProto_TYPE_INT64:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_UINT64:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_FIXED64:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_SFIXED64:
fallthrough
case descriptor.FieldDescriptorProto_TYPE_SINT64:
if params.Int64AsString {
return "string"
} else {
return "number"
}
case descriptor.FieldDescriptorProto_TYPE_BOOL:
return "boolean"
case descriptor.FieldDescriptorProto_TYPE_STRING:
return "string"
case descriptor.FieldDescriptorProto_TYPE_BYTES:
return "Uint8Array"
case descriptor.FieldDescriptorProto_TYPE_ENUM:
t := f.GetEnumType()
if t.GetFile().GetPackage() != f.GetFile().GetPackage() {
// this field is imported from the outside
packageName := t.GetFile().GetPackage()
fullyQualifiedName := t.GetFullyQualifiedName()
importName := strings.Replace(fullyQualifiedName, packageName, formatImportModule(t.GetFile()), 1)
usedPackages[packageName] = true
return importName
}
return packageQualifiedName(t)
case descriptor.FieldDescriptorProto_TYPE_MESSAGE:
t := f.GetMessageType()
if t.GetFile().GetPackage() != f.GetFile().GetPackage() {
// this field is imported from the outside
packageName := t.GetFile().GetPackage()
fullyQualifiedName := t.GetFullyQualifiedName()
importName := strings.Replace(fullyQualifiedName, packageName, formatImportModule(t.GetFile()), 1)
usedPackages[packageName] = true
return importName
}
return packageQualifiedName(t)
}
return "any /*unknown*/"
}
func packageQualifiedName(e desc.Descriptor) string {
name := e.GetName()
var c desc.Descriptor
for c = e.GetParent(); c.GetParent() != nil; c = c.GetParent() {
name = fmt.Sprintf("%v.%v", c.GetName(), name)
}
return name
}
func (g *Generator) generateEnum(e *desc.EnumDescriptor, params *Parameters) {
name := e.GetName()
g.writeComment(e.GetSourceInfo().GetLeadingComments())
g.W(fmt.Sprintf("export enum %s {", name))
for _, v := range e.GetValues() {
g.incIndent()
trailingComment := ""
if comment := v.GetSourceInfo().GetTrailingComments(); comment != "" {
trailingComment = " // " + strings.TrimSpace(comment)
}
if params.EnumsAsInt {
g.W(fmt.Sprintf("%s = %v,%v", v.GetName(), v.GetNumber(), trailingComment))
} else {
g.W(fmt.Sprintf("%s = \"%v\",%v", v.GetName(), v.GetName(), trailingComment))
}
g.decIndent()
}
g.W("}")
}