System.ConsolePal.TryGetSpecialConsoleKey C# (CSharp) Method

        public static bool TryGetSpecialConsoleKey(char[] givenChars, int startIndex, int endIndex, out ConsoleKeyInfo key, out int keyLength)
        {
            int unprocessedCharCount = endIndex - startIndex;

            // First process special control character codes.  These override anything from terminfo.
            if (unprocessedCharCount > 0)
            {
                // Is this an erase / backspace?
                char c = givenChars[startIndex];
                if (c != s_posixDisableValue && c == s_veraseCharacter)
                {
                    key = new ConsoleKeyInfo(c, ConsoleKey.Backspace, shift: false, alt: false, control: false);
                    keyLength = 1;
                    return true;
                }
            }

            // Then process terminfo mappings.
            int minRange = TerminalFormatStrings.Instance.MinKeyFormatLength;
            if (unprocessedCharCount >= minRange)
            {
                int maxRange = Math.Min(unprocessedCharCount, TerminalFormatStrings.Instance.MaxKeyFormatLength);

                for (int i = maxRange; i >= minRange; i--)
                {
                    var currentString = new StringOrCharArray(givenChars, startIndex, i);

                    // Check if the string prefix matches.
                    if (TerminalFormatStrings.Instance.KeyFormatToConsoleKey.TryGetValue(currentString, out key))
                    {
                        keyLength = currentString.Length;
                        return true;
                    }
                }
            }

            // Otherwise, not a known special console key.
            key = default(ConsoleKeyInfo);
            keyLength = 0;
            return false;
        }