public IState Transition(IState state, Symbol symbol)
{
if (!this.allEdges.Contains(symbol))
{
return(null);
}
var states = (state as ListState <IState>).Value;
var result = new ListState <IState>(states.Select(x => null as IState).ToList());
for (int i = 0; i < states.Count(); i++)
{
if (states[i] == null)
{
continue;
}
var newStates = this.dfas[i].Item2.Transitions(states[i]);
if (newStates.TryGetValue(symbol, out var out_state))
{
(result as ListState <IState>).Value[i] = out_state;
}
}
return(result);
}
IReadOnlyDictionary <Symbol, IState> IDfa <TLabel, Symbol> .Transitions(IState state)
{
var states = (state as ListState <IState>).Value;
var result = new Dictionary <Symbol, IState>();
foreach (var edge in this.allEdges)
{
result[edge] = new ListState <IState>(states.Select(x => null as IState).ToList());
}
for (int i = 0; i < states.Count(); i++)
{
if (states[i] == null)
{
continue;
}
var newStates = this.dfas[i].Item2.Transitions(states[i]);
foreach (KeyValuePair <Symbol, IState> p in newStates)
{
IState newState = p.Value;
Symbol edge = p.Key;
if (!result.ContainsKey(edge))
{
// create empty state (only nulls) - null acts as an implicit fail state
result[edge] = new ListState <IState>(states.Select(x => null as IState).ToList());
}
(result[edge] as ListState <IState>).Value[i] = newState;
}
}
return(result);
}