/// <summary>
/// 递归获取指定转换开始能经到的所有转换的集合。
/// </summary>
/// <param name="transition">指定的转换。</param>
/// <returns>指定转换开始能经到的所有转换的集合。</returns>
/// <exception cref="ArgumentNullException"><paramref name="transition"/> 的值为 null 。</exception>
public static IEnumerable <IRegexFSMTransition <T> > RecurGetTransitions <T>(this IRegexFSMTransition <T> transition)
{
if (transition == null)
{
throw new ArgumentNullException(nameof(transition));
}
HashSet <IRegexFSMTransition <T> > transitions = new HashSet <IRegexFSMTransition <T> >();
RegexFSMUtility.RecurGetTransitionsInternal(transition, transitions);
return(transitions);
}
private static void RecurGetTransitionsInternal <T>(IRegexFSMTransition <T> transition, HashSet <IRegexFSMTransition <T> > transitions)
{
if (transitions.Add(transition))
{
if (transition.Target != null)
{
foreach (var _transition in transition.Target.Transitions.Where(t => t != null))
{
RegexFSMUtility.RecurGetTransitionsInternal(_transition, transitions);
}
}
}
}