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