public bool Eval(ref TokenStack <T> stack, ref RuleData data)
{
int originalIndex = data.Count;
for (int i = 0; i < Branches.Count; i++)
{
List <Rule <T> > rules = Branches[i];
stack.Mark();
{
if (EvalRules(ref stack, ref data, rules))
{
data.Insert(originalIndex, i);
stack.Unmark();
return(true);
}
}
stack.Jump();
data.RemoveRange(originalIndex, data.Count - originalIndex);
}
stack.Next();
return(false);
}
