go-opt/optional_marshaljson.go

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package opt
import (
"encoding/json"
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"github.com/reiver/go-erorr"
)
var _ json.Marshaler = Nothing[bool]()
var _ json.Marshaler = Nothing[string]()
// MarshalJSON makes it so json.Marshaler is implemented.
func (receiver Optional[T]) MarshalJSON() ([]byte, error) {
switch interface{}(receiver.value).(type) {
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case bool, string, json.Marshaler:
// these are OK.
default:
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return nil, erorr.Errorf("opt: cannot marshal something of type %T into JSON because parameterized type is %T rather than bool, string, or json.Marshaler", receiver, receiver.value)
}
if receiver.IsNothing() {
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return nil, erorr.Errorf("opt: cannot marshal opt.Nothing[%T]() into JSON", receiver.value)
}
return json.Marshal(receiver.value)
}