Beispiel #1
0
        /*
         * This static call constructs a RegexTree from a regular expression
         * pattern string and an option string.
         *
         * The method creates, drives, and drops a parser instance.
         */
        internal static RegexTree Parse(string re, RegexOptions op)
        {
            int end;
            var pcreOptions = TrimPcreRegexOption(re, out end);
            var pattern = TrimDelimiters(re, end);

            RegexParser p;
            RegexNode root;
            string[] capnamelist;

            p = new RegexParser((op & RegexOptions.CultureInvariant) != 0 ? CultureInfo.InvariantCulture : CultureInfo.CurrentCulture);

            p._options = op;

            p.SetPattern(pattern);
            p.CountCaptures();
            p.Reset(op);
            root = p.ScanRegex();

            if (p._capnamelist == null)
                capnamelist = null;
            else
                capnamelist = p._capnamelist.ToArray();

            return new RegexTree(root, p._caps, p._capnumlist, p._captop, p._capnames, capnamelist, op);
        }
Beispiel #2
0
        /*
         * Escapes all metacharacters (including (,),[,],{,},|,^,$,*,+,?,\, spaces and #)
         */
        internal static string Unescape(string input)
        {
            for (int i = 0; i < input.Length; i++)
            {
                if (input[i] == '\\')
                {
                    var sb = new StringBuilder();
                    RegexParser p = new RegexParser(CultureInfo.InvariantCulture);
                    int lastpos;
                    p.SetPattern(input);

                    sb.Append(input, 0, i);
                    do
                    {
                        i++;
                        p.Textto(i);
                        if (i < input.Length)
                            sb.Append(p.ScanCharEscape());
                        i = p.Textpos();
                        lastpos = i;
                        while (i < input.Length && input[i] != '\\')
                            i++;
                        sb.Append(input, lastpos, i - lastpos);
                    } while (i < input.Length);

                    return sb.ToString();
                }
            }

            return input;
        }
Beispiel #3
0
        /*
         * This static call constructs a flat concatenation node given
         * a replacement pattern.
         */
        internal static RegexReplacement ParseReplacement(string rep, Dictionary<int, int> caps, int capsize, Dictionary<string, int> capnames, RegexOptions op)
        {
            RegexParser p;
            RegexNode root;

            p = new RegexParser((op & RegexOptions.CultureInvariant) != 0 ? CultureInfo.InvariantCulture : CultureInfo.CurrentCulture);

            p._options = op;

            p.NoteCaptures(caps, capsize, capnames);
            p.SetPattern(rep);
            root = p.ScanReplacement();

            return new RegexReplacement(rep, root, caps);
        }