internal override void Visit( RegExDFS visitor ) {
visitor.Op( this );
lKid.Visit( visitor );
rKid.Visit( visitor );
}
/// <summary> /// This is the navigation method for running the visitor /// over the tree in a depth-first-search visit order. /// </summary> /// <param name="visitor">visitor.Op(this) is called on each node</param> internal abstract void Visit( RegExDFS visitor );