NLog.Targets.ColoredConsoleTarget.ColorizeEscapeSequences C# (CSharp) Method

        private static void ColorizeEscapeSequences(
            TextWriter output,
            string message,
            ColorPair startingColor,
            ColorPair defaultColor)
        {
            var colorStack = new Stack<ColorPair>();

            colorStack.Push(startingColor);

            int p0 = 0;

            while (p0 < message.Length)
            {
                int p1 = p0;
                while (p1 < message.Length && message[p1] >= 32)
                {
                    p1++;
                }

                // text
                if (p1 != p0)
                {
                    output.Write(message.Substring(p0, p1 - p0));
                }

                if (p1 >= message.Length)
                {
                    p0 = p1;
                    break;
                }

                // control characters
                char c1 = message[p1];
                char c2 = (char)0;

                if (p1 + 1 < message.Length)
                {
                    c2 = message[p1 + 1];
                }

                if (c1 == '\a' && c2 == '\a')
                {
                    output.Write('\a');
                    p0 = p1 + 2;
                    continue;
                }

                if (c1 == '\r' || c1 == '\n')
                {
                    Console.ForegroundColor = defaultColor.ForegroundColor;
                    Console.BackgroundColor = defaultColor.BackgroundColor;
                    output.Write(c1);
                    Console.ForegroundColor = colorStack.Peek().ForegroundColor;
                    Console.BackgroundColor = colorStack.Peek().BackgroundColor;
                    p0 = p1 + 1;
                    continue;
                }

                if (c1 == '\a')
                {
                    if (c2 == 'X')
                    {
                        colorStack.Pop();
                        Console.ForegroundColor = colorStack.Peek().ForegroundColor;
                        Console.BackgroundColor = colorStack.Peek().BackgroundColor;
                        p0 = p1 + 2;
                        continue;
                    }

                    var foreground = (ConsoleOutputColor)(c2 - 'A');
                    var background = (ConsoleOutputColor)(message[p1 + 2] - 'A');

                    if (foreground != ConsoleOutputColor.NoChange)
                    {
                        Console.ForegroundColor = (ConsoleColor)foreground;
                    }

                    if (background != ConsoleOutputColor.NoChange)
                    {
                        Console.BackgroundColor = (ConsoleColor)background;
                    }

                    colorStack.Push(new ColorPair(Console.ForegroundColor, Console.BackgroundColor));
                    p0 = p1 + 3;
                    continue;
                }

                output.Write(c1);
                p0 = p1 + 1;
            }

            if (p0 < message.Length)
            {
                output.Write(message.Substring(p0));
            }
        }