protected bool IsEmpty(BasePattern pattern)
{
return pattern.Type == PatternType.Group && pattern.Equals(GroupPattern.Empty);
}
private static void displayASTTransform(string patternText, BasePattern beforePattern, BasePattern afterPattern)
{
Console.WriteLine("Pattern Text:\n {0}", patternText.ShowVerbatim());
Console.WriteLine("Before Transform:");
Console.WriteLine(beforePattern.FormatAsTree(1));
Console.WriteLine("After Transform{0}:", afterPattern.Equals(beforePattern) ? " (unchanged)" : "");
Console.WriteLine(afterPattern.FormatAsTree(1));
Console.Write("\n");
}
