go-opt/optional_marshaljson.go

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package opt
import (
"encoding"
"fmt"
"reflect"
"github.com/reiver/go-erorr"
"github.com/reiver/go-json"
)
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) {
case json.Marshaler, encoding.TextMarshaler, bool, int, int8, int16, int32, int64, string, uint, uint8, uint16, uint32, uint64:
// these are OK.
default:
var reflectedType reflect.Type = reflect.TypeOf(receiver.value)
if nil == reflectedType {
return nil, errBadReflection
}
if reflect.Struct != reflectedType.Kind() {
return nil, erorr.Errorf("opt: cannot marshal something of type %T into JSON because parameterized type is %T is not supported", receiver, receiver.value)
}
}
if receiver.IsNothing() {
return nil, json.ErrEmpty(fmt.Sprintf("opt: cannot marshal opt.Nothing[%T]() into JSON", receiver.value))
}
return json.Marshal(receiver.value)
}