public static bool Run(Automaton a, string s)
{
if (a.IsSingleton)
{
return(s.Equals(a.Singleton));
}
if (a.IsDeterministic)
{
var p = a.Initial;
foreach (var t in s)
{
var q = p.Step(t);
if (q == null)
{
return(false);
}
p = q;
}
return(p.Accept);
}
var states = a.GetStates();
Automaton.SetStateNumbers(states);
var pp = new LinkedList <State>();
var ppOther = new LinkedList <State>();
var bb = new BitArray(states.Count);
var bbOther = new BitArray(states.Count);
_ = pp.AddLast(a.Initial);
var dest = new List <State>();
var accept = a.Initial.Accept;
foreach (var c in s)
{
accept = false;
ppOther.Clear();
bbOther.SetAll(false);
foreach (var p in pp)
{
dest.Clear();
p.Step(c, dest);
foreach (var q in dest)
{
if (q.Accept)
{
accept = true;
}
if (!bbOther.Get(q.Number))
{
bbOther.Set(q.Number, true);
_ = ppOther.AddLast(q);
}
}
}
var tp = pp;
pp = ppOther;
ppOther = tp;
var tb = bb;
bb = bbOther;
bbOther = tb;
}
return(accept);
}
