/// <summary>
/// Determinizes the given automaton using the given set of initial states.
/// </summary>
/// <param name="a">The automaton.</param>
/// <param name="initialset">The initial states.</param>
internal static void Determinize(Automaton a, List <State> initialset)
{
char[] points = a.GetStartPoints();
var comparer = new ListEqualityComparer <State>();
// Subset construction.
var sets = new Dictionary <List <State>, List <State> >(comparer);
var worklist = new LinkedList <List <State> >();
var newstate = new Dictionary <List <State>, State>();
sets.Add(initialset, initialset);
worklist.AddLast(initialset);
a.Initial = new State();
newstate.Add(initialset, a.Initial);
while (worklist.Count > 0)
{
List <State> s = worklist.RemoveAndReturnFirst();
State r;
newstate.TryGetValue(s, out r);
foreach (State q in s)
{
if (q.Accept)
{
r.Accept = true;
break;
}
}
for (int n = 0; n < points.Length; n++)
{
var p = (from qq in s from t in qq.Transitions where t.Min <= points[n] && points[n] <= t.Max select t.To).ToList();
if (!sets.ContainsKey(p))
{
sets.Add(p, p);
worklist.AddLast(p);
newstate.Add(p, new State());
}
State q;
newstate.TryGetValue(p, out q);
char min = points[n];
char max;
if (n + 1 < points.Length)
{
max = (char)(points[n + 1] - 1);
}
else
{
max = char.MaxValue;
}
r.Transitions.Add(new Transition(min, max, q));
}
}
a.IsDeterministic = true;
a.RemoveDeadTransitions();
}
/// <summary>
/// Indicates whether the current object is equal to another object of the same type.
/// </summary>
/// <returns>
/// true if the current object is equal to the <paramref name="other"/> parameter; otherwise, false.
/// </returns>
/// <param name="other">An object to compare with this object.
/// </param>
public bool Equals(ListEqualityComparer <T> other)
{
return(!object.ReferenceEquals(null, other));
}