Add evaluator
diff --git a/Parser.h b/Parser.h
index 102a3c3..d0a348d 100644
--- a/Parser.h
+++ b/Parser.h
@@ -36,6 +36,8 @@
 	QString message() const;
 	int status() const;
 
+    operator QString() const;
+
 private:
 	int _status = COMPLETE;
 	QString _message = "";