ComputeFirstCharClass()

static string bool CaseInsensitive[] System.Text.RegularExpressions.RegexPrefixAnalyzer.ComputeFirstCharClass ( RegexTree tree )

inlinestatic

Definition at line 84 of file RegexPrefixAnalyzer.cs.

    {
        Span<int> intStack = stackalloc int[32];
        RegexPrefixAnalyzer regexPrefixAnalyzer = new RegexPrefixAnalyzer(intStack);
        RegexFC regexFC = regexPrefixAnalyzer.RegexFCFromRegexTree(tree);
        regexPrefixAnalyzer.Dispose();
        if (regexFC == null || regexFC._nullable)
        {
            return null;
        }
        if (regexFC.CaseInsensitive)
        {
            regexFC.AddLowercase(((tree.Options & RegexOptions.CultureInvariant) != 0) ? CultureInfo.InvariantCulture : CultureInfo.CurrentCulture);
        }
        return new(string, bool)[1] { (regexFC.GetFirstChars(), regexFC.CaseInsensitive) };
    }

Referenced by System.Text.RegularExpressions.RegexWriter.RegexCodeFromRegexTree().