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|
package parser
import (
"encoding/json"
"errors"
"strconv"
)
const (
minId = 1
maxId = 20 * 1000 * 1000
)
type Id int32
func (id *Id) UnmarshalJSON(b []byte) error {
if len(b) > 0 && b[0] != '"' {
if err := id.unmarshalInt(b); err != nil {
return err
}
} else {
if err := id.unmarshalString(b); err != nil {
return err
}
}
if *id < minId || *id > maxId {
return errors.New("json: id is invalid")
}
return nil
}
func (id *Id) unmarshalInt(b []byte) error {
return json.Unmarshal(b, (*int32)(id))
}
func (id *Id) unmarshalString(b []byte) error {
var s string
if err := json.Unmarshal(b, &s); err != nil {
return err
}
i, err := strconv.Atoi(s)
if err != nil {
return err
}
*id = Id(i)
return nil
}
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