public override Node ExitQuotedString(Token node)
 {
     string quotedString = node.GetImage();
     // Remove first and last char which are both a quote.
     string content = quotedString.Substring(1, quotedString.Length - 2);
     node.AddValue(content);
     return node;
 }
 public override Node ExitUserName(Token node)
 {
     node.AddValue(node.GetImage().Substring(9).Trim());
     return node;
 }