/// <summary>
/// Add new state, this method check if the
/// state <see cref="T"/> exists, if not
/// add the state.
/// </summary>
/// <param name="state"></param>
public void AddState(NfaState <Q> state)
{
if (!IsExists(state.Id))
{
if (state.StateType == StateType.StartState)
{
CurrentStates.Add(state);
}
States.Add(state);
}
}
private void PopChoice()
{
CurrentStates[0].ClearState();
CurrentStates.Clear();
if (_statesStack.Count == 0)
{
throw new Exception("Choice stack is empty. Unable to fallback to another state.");
}
StateMemento memento = _statesStack.Pop();
_inx = memento.TokenIndex;
_move = memento.Move + 1;
CurrentStates.Add(memento.State);
}
public void PerformStep()
{
ProcessedWord += Word[CurrentPosition];
char symbol = Word[CurrentPosition];
var possibleNextStates = new List <State>();
foreach (var state in CurrentStates)
{
var nextStates = state.PossibleNextStates
.Where(x => x.Value.Invoke(symbol))
.Select(pair => pair.Key);
nextStates
.ForEach(s => possibleNextStates.Add(s));
}
CurrentStates.Clear();
foreach (var state in possibleNextStates)
{
CurrentStates.Add(state);
}
//foreach (var state in CurrentStates)
//{
// for (int i = 0; i < StateTraces.Count; i++)
// {
// var trace = StateTraces[i];
// var brandNewTrace = new StateTrace(trace);
// brandNewTrace.Add(state);
// if (!StateTraces.Contains(brandNewTrace))
// StateTraces.Add(trace);
// }
//}
CurrentPosition++;
}
/// <summary>
/// Set state type
/// </summary>
/// <param name="key">The state key</param>
/// <param name="type">The type to be set</param>
public void SetStateType(Q key, StateType type)
{
NfaState <Q> state = null;
if ((state = GetState(key)) != null)
{
state.StateType = type;
if (state.StateType == StateType.StartState)
{
CurrentStates.Add(state);
}
else
{
CurrentStates.RemoveState(key);
}
}
else
{
throw new Exception("State doesn't exists");
}
}