ComputeLeadingSubstring()

static string bool CaseInsensitive System.Text.RegularExpressions.RegexPrefixAnalyzer.ComputeLeadingSubstring ( RegexTree tree )

inlinestatic

Definition at line 27 of file RegexPrefixAnalyzer.cs.

    {
        RegexNode regexNode = tree.Root;
        RegexNode regexNode2 = null;
        int num = 0;
        while (true)
        {
            switch (regexNode.Type)
            {
            case 25:
                if (regexNode.ChildCount() > 0)
                {
                    regexNode2 = regexNode;
                    num = 0;
                }
                break;
            case 28:
            case 32:
                regexNode = regexNode.Child(0);
                regexNode2 = null;
                continue;
            case 3:
            case 6:
            case 43:
                if (regexNode.M > 0 && regexNode.M < 50000)
                {
                    return (Prefix: new string(regexNode.Ch, regexNode.M), CaseInsensitive: (regexNode.Options & RegexOptions.IgnoreCase) != 0);
                }
                return (Prefix: string.Empty, CaseInsensitive: false);
            case 9:
                return (Prefix: regexNode.Ch.ToString(), CaseInsensitive: (regexNode.Options & RegexOptions.IgnoreCase) != 0);
            case 12:
                return (Prefix: regexNode.Str, CaseInsensitive: (regexNode.Options & RegexOptions.IgnoreCase) != 0);
            default:
                return (Prefix: string.Empty, CaseInsensitive: false);
            case 14:
            case 15:
            case 16:
            case 18:
            case 19:
            case 20:
            case 21:
            case 23:
            case 30:
            case 31:
            case 41:
                break;
            }
            if (regexNode2 == null || num >= regexNode2.ChildCount())
            {
                break;
            }
            regexNode = regexNode2.Child(num++);
        }
        return (Prefix: string.Empty, CaseInsensitive: false);
    }

References System.Text.RegularExpressions.RegexPrefixAnalyzer.Prefix.

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