jsonenums/template.go

73 lines
1.8 KiB
Go

// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// 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 $values}}"{{.Custom}}": {{.Raw}},
{{end}}
}
_{{$typename}}ValueToName = map[{{$typename}}]string {
{{range $values}}{{.Raw}}: "{{.Custom}}",
{{end}}
}
)
func init() {
var v {{$typename}}
if _, ok := interface{}(v).(fmt.Stringer); ok {
_{{$typename}}NameToValue = map[string]{{$typename}} {
{{range $values}}interface{}({{.Raw}}).(fmt.Stringer).String(): {{.Raw}},
{{end}}
}
}
}
// MarshalJSON is generated so {{$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.
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 := _{{$typename}}NameToValue[s]
if !ok {
return fmt.Errorf("invalid {{$typename}} %q", s)
}
*r = v
return nil
}
{{end}}
`))