public LinkedTreeNode(LinkedTreeNode root, string nonTerminal, List <char> matched, SourceData sourceData)
{
_root = root == null ? this : root;
_nonTerminal = nonTerminal;
_matched = matched;
_sourceData = sourceData;
_children = new List <LinkedTreeNode>(); // TODO Ambiguity problem
}
public LinkedTreeNode(string nonTerminal, SourceData sourceData) : this(null, nonTerminal, new List <char>(), sourceData)
{
}