operator-dot.go: '*dataCursor' case added; to be enhanced

operator-dot.go

@@ -56,6 +56,18 @@ func evalDot(ctx ExprContext, self *term) (v any, err error) {
 		if v, ok = unboxedValue[rightValue]; !ok {
 			err = fmt.Errorf("key %v does not belong to the dictionary", rightValue)
 		}
+	case *dataCursor:
+		if indexTerm.symbol() == SymString {
+			opName := indexTerm.value()
+			if opName == resetName {
+				err = unboxedValue.Reset()
+			} else if opName == cleanName {
+				err = unboxedValue.Clean()
+			} else {
+				err = indexTerm.Errorf("iterators do not support command %q", opName)
+			}
+			v = err == nil
+		}
 	default:
 		err = self.errIncompatibleTypes(leftValue, rightValue)
 	}