/// <summary>
/// Parses all instructions and returns the command interface list.
/// </summary>
/// <param name="instructions">String</param>
/// <returns>Commands</returns>
public IEnumerable <ICommand> Parse(string instructions)
{
if (string.IsNullOrWhiteSpace(instructions))
{
throw new ArgumentNullException(null, "Instructions parameter cannot be null or empty");
}
var instructionLines = instructions.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None);
if (instructionLines.Length < GameSettingsDefaults.MinimumFormatLength)
{
throw new ArgumentException($"The length of the settings cannot be lower than minimum length {GameSettingsDefaults.MinimumFormatLength}");
}
var commands = new List <ICommand>();
#region Line 1: The first line should define the board size
var boardSize = instructionLines[0];
_boardValidator.IsValidBoardSize(boardSize);
commands.Add(ParseBoardSetCommand(boardSize));
#endregion
#region Line 2: The second line should contain a list of mines (i.e. list of co-ordinates separate by a space)
var listOfMines = instructionLines[1];
_obstaclesValidator.IsValidListOfObstacles(listOfMines);
var point = listOfMines.Split(' '); // 1,1 1,3 3,3
commands.AddRange(point.Select(ParseMineSetCommand));
#endregion
#region Line 3: The third line of the file should contain the exit point
var exitPoint = instructionLines[2];
_exitValidator.IsValidExitPoint(exitPoint);
commands.Add(ParseExitSetCommand(exitPoint));
#endregion
#region Line 4: The fourth line of the file should contain the starting position of the turtle.
var turtleStartingPosition = instructionLines[3];
var directions = Enum.GetValues(typeof(Direction)).Cast <Direction>().Select(x => x.ToString()).ToList();
_animalValidator.IsValidAnimalStartingPoint(directions, turtleStartingPosition);
commands.Add(ParseTurtleSetCommand(turtleStartingPosition));
#endregion
#region Line 5, ...: The fifth line to the end of the file should contain a series of moves.
var movementInstructions = new StringBuilder();
foreach (var instructionLine in instructionLines.Skip(4))
{
var movements = Enum.GetValues(typeof(Movement)).Cast <Movement>().Select(x => x.ToString()).ToList();
_animalValidator.IsValidAnimalMovements(movements, instructionLine);
movementInstructions.AppendFormat("{0} ", instructionLine);
}
if (!string.IsNullOrEmpty(movementInstructions.ToString()))
{
commands.Add(ParseTurtleMoveCommand(movementInstructions.ToString().Trim()));
}
#endregion
return(commands);
}
public void Should_ThrowArgumentNullException_When_TheExitPointComesNullOrWhiteSpace(string exitPoint)
{
var exception = Assert.Throws <ArgumentNullException>(() => _exitValidator.IsValidExitPoint(exitPoint));
Assert.Equal("Exit point parameter cannot be null or empty", exception.Message);
}