jsonenums/template.go

82 lines
2.2 KiB
Go
Raw Normal View History

2017-05-04 21:18:34 +02:00
// 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.
2015-01-29 11:35:15 +01:00
// 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(`
// generated by jsonenums {{.Command}}; DO NOT EDIT
package {{.PackageName}}
import (
"encoding/json"
"fmt"
)
{{range $typename, $values := .TypesAndValues}}
var (
_{{$typename}}NameToValue = map[string]{{$typename}} {
{{range $values}}"{{.}}": {{.}},
{{end}}
}
_{{$typename}}ValueToName = map[{{$typename}}]string {
{{range $values}}{{.}}: "{{.}}",
{{end}}
}
)
2015-01-29 11:35:15 +01:00
2015-01-31 12:21:55 +01:00
func init() {
var v {{$typename}}
if _, ok := interface{}(v).(fmt.Stringer); ok {
_{{$typename}}NameToValue = map[string]{{$typename}} {
{{range $values}}interface{}({{.}}).(fmt.Stringer).String(): {{.}},
{{end}}
2015-01-31 12:21:55 +01:00
}
}
}
// MarshalJSON is generated so {{$typename}} satisfies 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 {{$typename}}: %d", r)
}
return json.Marshal(s)
}
// UnmarshalJSON is generated so {{$typename}} satisfies json.Unmarshaler.
2015-01-29 11:35:15 +01:00
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 := _{{$typename}}NameToValue[s]
if !ok {
2015-01-29 11:35:15 +01:00
return fmt.Errorf("invalid {{$typename}} %q", s)
}
*r = v
2015-01-29 11:35:15 +01:00
return nil
}
{{end}}
`))