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/
generator.go
164 lines (141 loc) · 4.43 KB
/
generator.go
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/*
Copyright 2022 Loophole Labs
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package generator
import (
"bytes"
"flag"
"github.com/loopholelabs/polyglot-rs/pkg/utils"
"os/exec"
"text/template"
"github.com/loopholelabs/polyglot-rs/internal/version"
"github.com/loopholelabs/polyglot-rs/templates"
"google.golang.org/protobuf/compiler/protogen"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/pluginpb"
)
type GeneratedFieldPrivacy string
const (
GeneratedFieldPrivacyPrivate = "private"
GeneratedFieldPrivacyPublic = "public"
GeneratedFieldPrivacyCrate = "crate"
)
type Generator struct {
options *protogen.Options
templ *template.Template
CustomFields func() string
CustomEncode func() string
CustomDecode func() string
}
func New() *Generator {
var g *Generator
var flags flag.FlagSet
privacy := flags.String("privacy", GeneratedFieldPrivacyPrivate, "Privacy of generated fields (private, public, crate)")
templ := template.Must(template.New("main").Funcs(template.FuncMap{
"CamelCase": utils.CamelCaseFullName,
"CamelCaseName": utils.CamelCaseName,
"MakeIterable": utils.MakeIterable,
"Counter": utils.Counter,
"FirstLowerCase": utils.FirstLowerCase,
"FirstLowerCaseName": utils.FirstLowerCaseName,
"FindValue": findValue,
"GetKind": getKind,
"GetLUTEncoder": getLUTEncoder,
"GetLUTDecoder": getLUTDecoder,
"GetEncodingFields": getEncodingFields,
"GetDecodingFields": getDecodingFields,
"GetKindLUT": getKindLUT,
"SnakeCase": utils.SnakeCase,
"SnakeCaseName": utils.SnakeCaseName,
"CustomFields": func() string {
return g.CustomFields()
},
"CustomEncode": func() string {
return g.CustomEncode()
},
"CustomDecode": func() string {
return g.CustomDecode()
},
"GeneratedFieldPrivacy": func() GeneratedFieldPrivacy {
return GeneratedFieldPrivacy(*privacy)
},
}).ParseFS(templates.FS, "*"))
g = &Generator{
options: &protogen.Options{
ParamFunc: flags.Set,
ImportRewriteFunc: func(path protogen.GoImportPath) protogen.GoImportPath { return path },
},
templ: templ,
CustomEncode: func() string { return "" },
CustomDecode: func() string { return "" },
CustomFields: func() string { return "" },
}
return g
}
func (*Generator) UnmarshalRequest(buf []byte) (*pluginpb.CodeGeneratorRequest, error) {
req := new(pluginpb.CodeGeneratorRequest)
return req, proto.Unmarshal(buf, req)
}
func (*Generator) MarshalResponse(res *pluginpb.CodeGeneratorResponse) ([]byte, error) {
return proto.Marshal(res)
}
func (g *Generator) Generate(req *pluginpb.CodeGeneratorRequest) (res *pluginpb.CodeGeneratorResponse, err error) {
plugin, err := g.options.New(req)
if err != nil {
return nil, err
}
for _, f := range plugin.Files {
if !f.Generate {
continue
}
genFile := plugin.NewGeneratedFile(FileName(f.GeneratedFilenamePrefix), f.GoImportPath)
packageName := string(f.Desc.Package().Name())
if packageName == "" {
packageName = string(f.GoPackageName)
}
err = g.ExecuteTemplate(genFile, f, packageName, true)
if err != nil {
return nil, err
}
}
return plugin.Response(), nil
}
func (g *Generator) ExecuteTemplate(
genFile *protogen.GeneratedFile,
protoFile *protogen.File,
packageName string,
header bool,
) error {
var buf bytes.Buffer
deps := DependencyAnalysis(protoFile)
err := g.templ.ExecuteTemplate(&buf, "base.templ", map[string]interface{}{
"pluginVersion": version.Version,
"sourcePath": protoFile.Desc.Path(),
"package": packageName,
"enums": protoFile.Desc.Enums(),
"messages": protoFile.Desc.Messages(),
"header": header,
"dependencies": deps,
})
if err != nil {
return err
}
cmd := exec.Command("rustfmt")
cmd.Stdin = bytes.NewReader(buf.Bytes())
output, err := cmd.CombinedOutput()
if err != nil {
println(string(output))
return err
}
_, err = genFile.Write(output)
return err
}