/// <summary>
/// Parses a series
/// </summary>
/// <param name="instructions"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public IReadOnlyList <RelativeInstruction> ParseRawInstructions(string instructions)
{
// Input checking.
if (instructions == null)
{
throw new ArgumentNullException(nameof(instructions));
}
var currentDirections = new List <RelativeInstruction>();
string[] splitString = instructions.Split(Delimiter);
foreach (string split in splitString)
{
currentDirections.Add(InstructionParser.ParseSingleInstruction(split));
}
return(currentDirections.AsReadOnly());
}