jsonenums/template.go

80 lines
1.9 KiB
Go

// Copyright 2017 Google Inc. All rights reserved.
// 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 writing, software distributed
// under the License is distributed on a "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.
// Added as a .go file to avoid embedding issues of the template.
package main
import "text/template"
var generatedTmpl = template.Must(template.New("generated").Parse(`
// Code generated by "jsonenums {{.Command}}"; DO NOT EDIT.
package {{.PackageName}}
import (
"encoding/json"
"fmt"
)
{{range $typename, $values := .TypesAndValues}}
var (
_{{$typename}}NameToValue map[string]{{$typename}}
_{{$typename}}ValueToName map[{{$typename}}]string
)
func init() {
_{{$typename}}NameToValue = map[string]{{$typename}} {
{{range $values}}{{.}}.String(): {{.}},
{{end}}
}
_{{$typename}}ValueToName = map[{{$typename}}]string {
{{range $values}}{{.}}: {{.}}.String(),
{{end}}
}
}
// MarshalJSON implements json.Marshaler
func (r {{$typename}}) MarshalJSON() ([]byte, error) {
if s, ok := interface{}(r).(fmt.Stringer); ok {
return json.Marshal(s.String())
}
s, ok := _{{$typename}}ValueToName[r]
if !ok {
return nil, fmt.Errorf("invalid {{$typename}}: %d", r)
}
return json.Marshal(s)
}
// UnmarshalJSON implements json.Unmarshaler
func (r *{{$typename}}) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return fmt.Errorf("{{$typename}} should be a string, got %s", data)
}
v, ok := _{{$typename}}NameToValue[s]
if !ok {
return fmt.Errorf("invalid value: %s", s)
}
*r = v
return nil
}
{{end}}
`))