/// <summary>
/// 从 <see cref="RegexNFA{T}"/> 的一个指定状态移除指定 ε 转换。
/// </summary>
/// <param name="state">指定的状态。</param>
/// <param name="epsilonTransition">要添加的 ε 转换。</param>
/// <returns>一个值，指示操作是否成功。</returns>
public virtual bool RemoveTransition(IRegexNFAState <T> state, IRegexFSMEpsilonTransition <T> epsilonTransition) => base.RemoveTransition(state, epsilonTransition);
protected virtual IRegexFSMTransition <T> GenerateNFATransitionFromRegexGroupReference(
RegexGroupReference <T> groupReference,
IRegexNFA <T> nfa,
IRegexNFAState <T> state
)
{
RegexGroup <T> group;
if (groupReference.IsDetermined)
{
group = groupReference.Group;
}
else
{
IRegexFSMEpsilonTransition <T> epsilonTransition = this.contextInfo.ActivateRegexFSMEpsilonTransition();
var groups = this.regexGroups.Where(_group => _group.ID == groupReference.GroupID).ToArray();
switch (groups.Length)
{
case 0:
//throw new InvalidOperationException("未找到引用的正则组。");
epsilonTransition = this.contextInfo.ActivateRegexFSMEpsilonTransition();
nfa.AttachTransition(state, epsilonTransition);
return(epsilonTransition);
case 1:
group = groups[0];
break;
default:
group = new RegexGroup <T>(
groups.Select(_group => _group.InnerRegex).UnionMany()
);
break;
//throw new InvalidOperationException("找到多个重复 ID 的正则组。");
//epsilonTransition = this.contextInfo.ActivateRegexNFAEpsilonTransition();
//nfa.AttachTransition(state, epsilonTransition);
//return epsilonTransition;
}
}
IRegexNFAState <T> nextState = state;
var lastCaptureReferenceTransition = new RegexFSMLastCaptureReferenceTransition <T>(group, group.ID, (sender, readerSource, handler, args) =>
{
if (args.FirstOrDefault() is IRegexFSM <T> fsm)
{
if (fsm.TryGetLastCapture(sender.IDToken, sender.ID, out int start, out int length))
{
var progressService = fsm.GetService <RegexFSM <T> .ProgressService>();
var progress = progressService.GetProgress();
foreach (var t in fsm.Inputs.Skip(start).Take(length))
{
if (!(readerSource.HasNext() && EqualityComparer <T> .Default.Equals(readerSource.Read(), t)))
{
progressService.SetProgress(progress);
return(false);
}
}
return(true);
}
}
/// <summary>
/// 为 <see cref="RegexNFA{T}"/> 的一个指定状态添加指定 ε 转换。
/// </summary>
/// <param name="state">指定的状态。</param>
/// <param name="epsilonTransition">要添加的 ε 转换。</param>
/// <returns>一个值，指示操作是否成功。</returns>
public virtual bool AttachTransition(IRegexNFAState <T> state, IRegexFSMEpsilonTransition <T> epsilonTransition) => base.AttachTransition(state, epsilonTransition);
