private static void WriteNode(SimpleTreeNode node, StringBuilder sb)
{
sb.Append(node.Text);
if (node is SimpleGroupNode)
{
SimpleGroupNode group = (SimpleGroupNode)node;
sb.Append('(');
for (int i = 0; i < group.Count; i++)
{
if (i > 0)
{
sb.Append(',');
}
WriteNode(group[i], sb);
}
sb.Append(')');
}
}
public static string ToParenthesesFormat(SimpleTreeNode tree)
{
StringBuilder sb = new StringBuilder();
WriteNode(tree, sb);
return sb.ToString();
}