/// <summary>
/// テキスト全体でマッチ箇所を全て列挙
/// </summary>
/// <param name="str"></param>
/// <param name="context"></param>
/// <returns></returns>
public IEnumerable <RegexMatch> Matches(StringPointer str, MatingContext context)
{
for (int i = 0; i < str.Length + 1; i++)
{
var subStr = str.SubString(i);
foreach (var match in HeadMatches(subStr, new MatingContext()))
{
yield return(match);
}
}
}
/// <summary>
/// 範囲重複を許容せず最高優先マッチ箇所をすべて列挙
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public IEnumerable <RegexMatch> MatchesRegular(StringPointer str)
{
for (int i = 0; i < str.Length + 1; i++)
{
var subStr = str.SubString(i);
var match = HeadMatch(subStr, new MatingContext());
if (match != null)
{
yield return(match);
i += Math.Max(match.Length - 1, 0);
}
}
}
/// <summary>
/// 文字列の先頭から、後続を考慮したマッチを優先度順に列挙
/// </summary>
/// <param name="str"></param>
/// <param name="context"></param>
/// <returns></returns>
public IEnumerable <RegexMatch> HeadMatches(StringPointer str, MatingContext context)
{
if (_nextRegex == null)//末端は自身のマッチを返せばいい。
{
foreach (var matching in SimpleMatchings(str, context))
{
yield return(matching);
}
}
else//末端以外は、自分以降にマッチが存在するマッチを返す。
{
foreach (var selfMatch in SimpleMatchings(str, context))
{
var nextStr = str.SubString(selfMatch.Length);
foreach (var nextMatch in _nextRegex.HeadMatches(nextStr, context))
{
yield return(new ArrayMatch(str, selfMatch, nextMatch));
}
}
}
}
/// <summary> /// 与えられた文字列が先頭からこの正規表現にマッチするか判定。後続のことは考慮しない。 /// </summary> /// <param name="str"></param> /// <param name="context"></param> /// <returns>マッチ優先度高い順のマッチ。マッチしないときは空のIEnumerable</returns> public abstract IEnumerable <RegexMatch> SimpleMatchings(StringPointer str, MatingContext context);
/// <summary>
/// 文字列の末尾で終わる、後続を考慮したマッチを優先度順に列挙
/// (後よみ用？)
/// </summary>
/// <param name="str"></param>
/// <param name="context"></param>
/// <returns></returns>
public IEnumerable <RegexMatch> TailMatches(StringPointer str, MatingContext context)
{
return(Matches(str, context).Where(match => match.AfterStr == ""));
}
/// <summary>
/// このRegexChainの再優先マッチを取得。マッチしなければnull
/// </summary>
/// <param name="str"></param>
/// <param name="context"></param>
/// <returns></returns>
public RegexMatch HeadMatch(StringPointer str, MatingContext context)
{
return(HeadMatches(str, context).FirstOrDefault());
}
protected IEnumerable <RegexMatch> PerfectMatches(StringPointer str, MatingContext context)
{
return(HeadMatches(str, context).Where(m => m.Length == str.Length));
}