30 lines
734 B
Go
30 lines
734 B
Go
|
package nul
|
|||
|
|
|
|||
|
|
import (
|
|||
|
|
"fmt"
|
|||
|
|
"encoding/json"
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
var _ json.Marshaler = Nothing[bool]()
|
|||
|
|
var _ json.Marshaler = Nothing[string]()
|
|||
|
|
|
|||
|
|
// MarshalJSON makes it so json.Marshaler is implemented.
|
|||
|
|
func (receiver Nullable[T]) MarshalJSON() ([]byte, error) {
|
|||
|
|
switch interface{}(receiver.value).(type) {
|
|||
|
|
case bool, string:
|
|||
|
|
// these are OK.
|
|||
|
|
default:
|
|||
|
|
return nil, fmt.Errorf("cannot marshal something of type %T into JSON because parameterized type is ‘%T’ rather than ‘bool’ or ‘string’", receiver, receiver.value)
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if receiver.isnothing() {
|
|||
|
|
return nil, fmt.Errorf("cannot marshal opt.Nothing[%T]() into JSON", receiver.value)
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if receiver.isnull {
|
|||
|
|
return json.Marshal(nil)
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return json.Marshal(receiver.value)
|
|||
|
|
}
|