IronRuby.Builtins.RegexpTransformer.ParseUnicodeCodePoint C# (CSharp) Method

        private int ParseUnicodeCodePoint() {
            int codepoint = 0;
            int i = 0;
            while (true) {
                int digit = Tokenizer.ToDigit(Peek());
                if (digit >= 16) {
                    break;
                }

                if (i < 7) {
                    codepoint = (codepoint << 4) | digit;
                }

                i++;
                Skip();
            }

            if (i == 0) {
                throw MakeError("invalid Unicode list");
            }
            return codepoint;
        }