AmandaInterface.AmandaTagParser.GetBracketMismatch C# (CSharp) Метод

        public int GetBracketMismatch(string code)
        {
            Dictionary<char, char> bracketMap = new Dictionary<char, char>()
            { {'{', '}'}, {'(', ')'}, {'[', ']'}, {'<', '>'} };//, {'\'', '\''} }; //{} () [] <> "" ''
            Stack<char> bracketStack = new Stack<char>();
            int counter = 0;

            foreach (char c in code)
            {
                if("(){}<>".Contains(c))
                {
                    if (!")}>".Contains(c))
                    {
                        bracketStack.Push(c);
                    }
                    else if (bracketMap.Any(q => q.Key == bracketMap[bracketStack.Last()]))
                    {
                        bracketStack.Pop();
                    }
                    else
                    {
                        return counter;
                    }
                }
                counter++;
            }

            return -1;
        }