public ParseNodeDrawable(ParseNodeDrawable parent, ParseNodeDrawable child, string symbol)
{
this.children = new List <ParseNode>();
this.depth = child.depth;
child.UpdateDepths(this.depth + 1);
this.parent = parent;
this.parent.SetChild(parent.GetChildIndex(child), this);
this.children.Add(child);
child.parent = this;
this.data = new Symbol(symbol);
}
