forked from anjmao/go2proto
/
importable.go
209 lines (185 loc) · 4.18 KB
/
importable.go
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package importable
import (
"errors"
"fmt"
"go/token"
"go/types"
"golang.org/x/tools/go/packages"
"os"
"path/filepath"
"sort"
"strings"
"text/template"
"unicode"
"unicode/utf8"
)
type ArrFlags []string
func (i *ArrFlags) String() string {
return ""
}
func (i *ArrFlags) Set(value string) error {
*i = append(*i, value)
return nil
}
// attempt to load all packages
func LoadPackages(pwd string, pkgs []string) ([]*packages.Package, error) {
fset := token.NewFileSet()
cfg := &packages.Config{
Dir: pwd,
Mode: packages.LoadSyntax,
Fset: fset,
}
packages, err := packages.Load(cfg, pkgs...)
if err != nil {
return nil, err
}
var errs = ""
//check each loaded package for errors during loading
for _, p := range packages {
if len(p.Errors) > 0 {
errs += fmt.Sprintf("error fetching package %s: ", p.String())
for _, e := range p.Errors {
errs += e.Error()
}
errs += "; "
}
}
if errs != "" {
return nil, errors.New(errs)
}
return packages, nil
}
type ProtoMessage struct {
Name string
Fields []*MessageField
}
type MessageField struct {
Name string
TypeName string
Order int
IsRepeated bool
}
func GetMessages(pkgs []*packages.Package, filter string) []*ProtoMessage {
var out []*ProtoMessage
seen := map[string]struct{}{}
for _, p := range pkgs {
for _, t := range p.TypesInfo.Defs {
if t == nil {
continue
}
if !t.Exported() {
continue
}
if _, ok := seen[t.Name()]; ok {
continue
}
if s, ok := t.Type().Underlying().(*types.Struct); ok {
seen[t.Name()] = struct{}{}
if filter == "" || strings.Contains(strings.ToLower(t.Name()), filter) {
out = StructToProto(out, t, s)
}
}
}
}
sort.Slice(out, func(i, j int) bool { return out[i].Name < out[j].Name })
return out
}
func StructToProto(out []*ProtoMessage, t types.Object, s *types.Struct) []*ProtoMessage {
msg := &ProtoMessage{
Name: t.Name(),
Fields: []*MessageField{},
}
for i := 0; i < s.NumFields(); i++ {
f := s.Field(i)
if !f.Exported() {
continue
}
newField := &MessageField{
Name: AdaptNameToProto(f.Name()),
TypeName: AdaptGoTypeToProto(f),
IsRepeated: IsRepeated(f),
Order: i + 1,
}
msg.Fields = append(msg.Fields, newField)
}
out = append(out, msg)
return out
}
func AdaptGoTypeToProto(f *types.Var) string {
switch f.Type().Underlying().(type) {
case *types.Basic:
name := f.Type().String()
return NormalizeType(name)
case *types.Slice:
name := SplitNameHelper(f)
return NormalizeType(strings.TrimLeft(name, "[]"))
case *types.Pointer, *types.Struct:
name := SplitNameHelper(f)
return NormalizeType(name)
}
return f.Type().String()
}
func SplitNameHelper(f *types.Var) string {
// TODO: this is ugly. Find another way of getting MessageField type name.
parts := strings.Split(f.Type().String(), ".")
name := parts[len(parts)-1]
if name[0] == '*' {
name = name[1:]
}
return name
}
func NormalizeType(name string) string {
switch name {
case "int":
return "int64"
case "float32":
return "float"
case "float64":
return "double"
default:
return name
}
}
func IsRepeated(f *types.Var) bool {
_, ok := f.Type().Underlying().(*types.Slice)
return ok
}
func AdaptNameToProto(name string) string {
if len(name) == 2 {
return strings.ToLower(name)
}
r, n := utf8.DecodeRuneInString(name)
return string(unicode.ToLower(r)) + name[n:]
}
type ProtoFileTemplateData struct {
Version int
Messages []*ProtoMessage
}
func WriteToFile(version int, msgs []*ProtoMessage, path string, outputFileName string) error {
msgTemplate := `// version {{ .Version }}
syntax = "proto3";
package proto;
option go_package = "./";
{{range .Messages}}
message {{.Name}} {
{{- range .Fields}}
{{- if .IsRepeated}}
repeated {{.TypeName}} {{.Name}} = {{.Order}};
{{- else}}
{{.TypeName}} {{.Name}} = {{.Order}};
{{- end}}
{{- end}}
}
{{end}}
`
tmpl, err := template.New("test").Parse(msgTemplate)
if err != nil {
panic(err)
}
f, err := os.Create(filepath.Join(path, outputFileName))
if err != nil {
return fmt.Errorf("unable to create file %s : %s", outputFileName, err)
}
defer f.Close()
return tmpl.Execute(f, &ProtoFileTemplateData{Version: version, Messages: msgs})
}