gojson: added MarshalSafeCollections

gojson/stream.go

@@ -179,9 +179,11 @@ func nonSpace(b []byte) bool {
 
 // An Encoder writes JSON values to an output stream.
 type Encoder struct {
-	w          io.Writer
-	err        error
-	escapeHTML bool
+	w             io.Writer
+	err           error
+	escapeHTML    bool
+	nilSafeSlices bool
+	nilSafeMaps   bool
 
 	indentBuf    *bytes.Buffer
 	indentPrefix string
@@ -206,7 +208,7 @@ func (enc *Encoder) Encode(v any) error {
 	e := newEncodeState()
 	defer encodeStatePool.Put(e)
 
-	err := e.marshal(v, encOpts{escapeHTML: enc.escapeHTML})
+	err := e.marshal(v, encOpts{escapeHTML: enc.escapeHTML, nilSafeMaps: enc.nilSafeMaps, nilSafeSlices: enc.nilSafeSlices})
 	if err != nil {
 		return err
 	}
@@ -245,6 +247,13 @@ func (enc *Encoder) SetIndent(prefix, indent string) {
 	enc.indentValue = indent
 }
 
+// SetNilSafeCollection specifies whether to represent nil slices and maps as
+// '[]' or '{}' respectfully (flag on) instead of 'null' (default) when marshaling json.
+func (enc *Encoder) SetNilSafeCollection(nilSafeSlices bool, nilSafeMaps bool) {
+	enc.nilSafeSlices = nilSafeSlices
+	enc.nilSafeMaps = nilSafeMaps
+}
+
 // SetEscapeHTML specifies whether problematic HTML characters
 // should be escaped inside JSON quoted strings.
 // The default behavior is to escape &, <, and > to \u0026, \u003c, and \u003e