public CommandType GetNextCommand()

in src/Engines/InputParser.cs [29:70]
30 lines of code
10 McCabe index (conditional complexity)

        public CommandType GetNextCommand(string input, out ISymbol? symbol, out string commandInput, out string remainingInput)
        {
            if (input == null) { throw new ArgumentNullException("input"); }

            symbol = null;
            commandInput = input;
            remainingInput = string.Empty;

            var inputLines = input.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None).ToList();
            if (inputLines == null || inputLines.Count == 0)
            {
                return CommandType.Mundane;
            }

            // Find the first non-whitespace line and see if it starts with a magic symbol.
            bool isHelp = false;
            int firstLineIndex = inputLines.FindIndex(s => !string.IsNullOrWhiteSpace(s));
            if (firstLineIndex < 0 || !StartsWithMagic(inputLines[firstLineIndex], out symbol, out isHelp))
            {
                // No magic symbol found.
                return isHelp ? CommandType.Help : CommandType.Mundane;
            }

            // Look through the remaining lines until we find one that
            // starts with a magic symbol.
            string? _commandInput = null;
            for (int lineIndex = firstLineIndex + 1; lineIndex < inputLines.Count; lineIndex++)
            {
                if (StartsWithMagic(inputLines[lineIndex], out _, out _))
                {
                    _commandInput = string.Join(Environment.NewLine, inputLines.SkipLast(inputLines.Count - lineIndex));
                    remainingInput = string.Join(Environment.NewLine, inputLines.Skip(lineIndex));
                    break;
                }
            }

            // If we didn't find another magic symbol, use the full input
            // as the command input.
            commandInput = _commandInput ?? input;

            return isHelp ? CommandType.MagicHelp : CommandType.Magic;
        }