public StateMachine(Label initialState, IEnumerable <Label> finalStates, IEnumerable <Transition> transitions, IEnumerable <Label> allStates = null)
{
if (initialState == null)
{
throw new ArgumentNullException(nameof(initialState));
}
if (finalStates == null)
{
throw new ArgumentNullException(nameof(finalStates));
}
if (transitions == null)
{
throw new ArgumentNullException(nameof(transitions));
}
FinalStates = finalStates.ToSortedSet().AsReadOnly();
Transitions = transitions.ToSortedSet().AsReadOnly();
if (Transitions.AnyNull())
{
throw new ArgumentException("One of the transitions is null.", nameof(transitions));
}
if (!FinalStates.Any())
{
throw new ArgumentException("Final states set is empty.", nameof(finalStates));
}
if (FinalStates.AnyNull())
{
throw new ArgumentException("One of the final state is null.", nameof(finalStates));
}
ISet <Label> states = ExtractStates(Transitions);
states.Add(initialState);
if (allStates != null)
{
ISet <Label> allStatesSet = allStates.ToSortedSet();
if (allStatesSet.AnyNull())
{
throw new ArgumentException("One of the state is null.", nameof(allStates));
}
if (!allStatesSet.IsSupersetOf(states))
{
throw new ArgumentException("States are not the superset of real states.", nameof(allStates));
}
States = allStatesSet.AsReadOnly();
}
else
{
States = states.AsReadOnly();
}
Alphabet = Transitions.Select(t => t.Symbol).ToSortedSet().AsReadOnly();
InitialState = initialState;
}