basic marshaler support
diff --git a/encode.go b/encode.go
index 74a121b..175071d 100644
--- a/encode.go
+++ b/encode.go
@@ -26,6 +26,12 @@
return e.Bytes(), nil
}
+// Marshaler is the interface implemented by objects that
+// can marshal themselves into valid JSON.
+type Marshaler interface {
+ MarshalJSON() ([]byte, error)
+}
+
// An UnsupportedTypeError is returned by Marshal when attempting
// to encode an unsupported value type.
type UnsupportedTypeError struct {
@@ -137,6 +143,26 @@
return
}
+ m, ok := v.Interface().(Marshaler)
+ if !ok {
+ // T doesn't match the interface. Check against *T too.
+ if v.Kind() != reflect.Ptr && v.CanAddr() {
+ m, ok = v.Addr().Interface().(Marshaler)
+ if ok {
+ v = v.Addr()
+ }
+ }
+ }
+ if ok && (v.Kind() != reflect.Ptr || !v.IsNil()) {
+ b, err := m.MarshalJSON()
+ if err != nil {
+ e.error(&MarshalerError{v.Type(), err})
+ }
+ // TODO: canonicalize this json
+ e.Buffer.Write(b)
+ return
+ }
+
writeString := (*encodeState).WriteString
if quoted {
writeString = (*encodeState).string
