private LL1Item find(NTType first, VTType second)
{
if (LL1ItemList.Any(v => v.NT == first && v.meet == second))
{
return(LL1ItemList.First(v => v.NT == first && v.meet == second));
}
return(null);
}
public Rule(NTType start, List <NTVTType> words)
{
_start = start;
_words = new List <NTVTType>();
_words.AddRange(words);
}
public Rule(NTType start)
{
_start = start;
_words = new List <NTVTType>();
}
/// <summary>
/// 若first课归结为ε，返回True，否则返回False
/// </summary>
/// <param name="first"></param>
/// <returns></returns>
private bool existX(NTType first)
{
return(LL1ItemList.Any(v => v.NT == first &&
v.Rule.Contains(NTVTType.ε)));
}
private NTVTType toNTVT(NTType nt)
{
return((NTVTType)Enum.Parse(typeof(NTVTType), nt.ToString()));
}