io.IoLexer.popPosBack C# (CSharp) Method

        public void popPosBack()
        {
            int i = Convert.ToInt32(tokenStack.Pop());
            int topIndex = Convert.ToInt32(tokenStack.Peek());
            if (i > -1)
            {
                if (i != topIndex)
                {
                    IoToken parent = currentToken();
                    if (parent != null)
                    {
                        parent.nextToken = null;
                    }
                }
            }
            currentPos = Convert.ToInt32(posStack.Pop());
        }