/
gen.go
100 lines (80 loc) · 2.35 KB
/
gen.go
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// Copyright © 2021 The Things Industries B.V.
// SPDX-License-Identifier: Apache-2.0
package gen
import (
"fmt"
"strings"
"google.golang.org/protobuf/compiler/protogen"
)
// Version is the version of the generator.
var Version = "0.0.0-dev"
// Params are the parameters for the generator.
var Params struct {
Lang string
CustomTypeGetterPrefix string
CustomTypeGetterSuffix string
}
const (
pflagPackage = protogen.GoImportPath("github.com/spf13/pflag")
flagspluginPackage = protogen.GoImportPath("github.com/TheThingsIndustries/protoc-gen-go-flags/flagsplugin")
golangPluginPackage = protogen.GoImportPath("github.com/TheThingsIndustries/protoc-gen-go-flags/golang")
)
type generator struct {
gen *protogen.Plugin
file *protogen.File
*protogen.GeneratedFile
}
var flagNameReplacer = strings.NewReplacer("_", "-")
// GenerateFile generates a file with JSON marshalers and unmarshalers.
func GenerateFile(gen *protogen.Plugin, file *protogen.File) *protogen.GeneratedFile {
g := &generator{
gen: gen,
file: file,
}
// If the file doesn't have marshalers or unmarshalers, we kan skip it.
if !g.fileHasAnyFlags() {
return nil
}
// Generate a new file that ends with `_flags.pb.go`.
filename := file.GeneratedFilenamePrefix + "_flags.pb.go"
g.GeneratedFile = gen.NewGeneratedFile(filename, file.GoImportPath)
// The standard header for generated files.
g.P("// Code generated by protoc-gen-go-flags. DO NOT EDIT.")
g.P("// versions:")
g.P("// - protoc-gen-go-flags v", Version)
g.P("// - protoc ", g.protocVersion())
if file.Proto.GetOptions().GetDeprecated() {
g.P("// ", file.Desc.Path(), " is a deprecated file.")
} else {
g.P("// source: ", file.Desc.Path())
}
g.P()
g.P("package ", file.GoPackageName)
g.P()
g.generateFileContent()
return g.GeneratedFile
}
func (g *generator) fileHasAnyFlags() bool {
for _, message := range g.file.Messages {
if g.messageHasAnyFlags(message) {
return true
}
}
return false
}
func (g *generator) protocVersion() string {
v := g.gen.Request.GetCompilerVersion()
if v == nil {
return "(unknown)"
}
var suffix string
if s := v.GetSuffix(); s != "" {
suffix = "-" + s
}
return fmt.Sprintf("v%d.%d.%d%s", v.GetMajor(), v.GetMinor(), v.GetPatch(), suffix)
}
func (g *generator) generateFileContent() {
for _, message := range g.file.Messages {
g.genMessage(message)
}
}