IronRuby.Builtins.RubyFileOps.Join C# (CSharp) Method

        public static MutableString Join(ConversionStorage<MutableString>/*!*/ toPath, RubyClass/*!*/ self, params object[]/*!*/ parts) {
            MutableString result = MutableString.CreateMutable(RubyEncoding.Binary);
            Dictionary<object, bool> visitedLists = null;
            var worklist = new Stack<object>();
            int current = 0;
            MutableString str;

            Push(worklist, parts);
            while (worklist.Count > 0) {
                object part = worklist.Pop();
                var list = part as IList;
                if (list != null) {
                    if (list.Count == 0) {
                        str = MutableString.FrozenEmpty;
                    } else if (visitedLists != null && visitedLists.ContainsKey(list)) {
                        str = RubyUtils.InfiniteRecursionMarker;
                    } else {
                        if (visitedLists == null) {
                            visitedLists = new Dictionary<object, bool>(ReferenceEqualityComparer<object>.Instance);
                        }
                        visitedLists.Add(list, true);
                        Push(worklist, list);
                        continue;
                    }
                } else if (part == null) {
                    throw RubyExceptions.CreateTypeConversionError("NilClass", "String");
                } else {
                    str = Protocols.CastToPath(toPath, part);
                }

                if (current > 0) {
                    AppendDirectoryName(result, str);
                } else {
                    result.Append(str);
                }
                current++;
            }

            return result;
        }