static void Main(string[] args)
{
MarsRover rover = new MarsRover(DefaultPlateauWidth, DefaultPlateauHeight);
if (args != null && args.Length > 0)
{
if (File.Exists(args[0]))
{
using (StreamReader file = new StreamReader(args[0]))
{
string line;
int lineNumber = 0;
while ((line = file.ReadLine()) != null)
{
lineNumber++;
if (string.IsNullOrEmpty(line))
{
continue;
}
ProcessCommand(ref rover, new CommandTokenizer(), line, lineNumber);
}
}
}
}
}
public static void ProcessCommand(ref MarsRover rover, ITokenizer tokenizer, string line, int lineNumber)
{
var tokenList = tokenizer.Tokenize(line);
if (tokenList.Count() < 2)
{
throw new Exception("Invalid input file at line " + lineNumber);
}
if (tokenList.ElementAt(0).TokenType == TokenType.Plateau)
{
if (tokenList.Count() != CommandLinePlateauNumOfParams)
{
throw new Exception("Invalid input for Plateau at line " + lineNumber);
}
rover = new MarsRover(Convert.ToInt32(tokenList.ElementAt(1).Value),
Convert.ToInt32(tokenList.ElementAt(2).Value));
}
//
// Assumption: we can use a default plateau size
else if (tokenList.ElementAt(1).TokenType == TokenType.Landing)
{
if (tokenList.Count() != CommandLineLandingNumOfParams)
{
throw new Exception("Invalid input for Landing at line " + lineNumber);
}
rover.Name = tokenList.ElementAt(0).Value;
rover.SetPosition(Convert.ToInt32(tokenList.ElementAt(2).Value),
Convert.ToInt32(tokenList.ElementAt(3).Value),
(RoverDirection)tokenList.ElementAt(4).Value[0]);
}
//
// Assumption: we can have multiple insturctions commands, as long as
// as the rover name is matching the current rover instance
else if (tokenList.ElementAt(1).TokenType == TokenType.Instructions)
{
if (tokenList.Count() != CommandLineInstructionsNumOfParams ||
!IsInstructionStringValid(tokenList.ElementAt(2).Value) ||
rover.Name != tokenList.ElementAt(0).Value)
{
throw new Exception("Invalid input for Instructions at line " + lineNumber);
}
try
{
rover.ProcessCommands(tokenList.ElementAt(2).Value);
Console.WriteLine(rover.Name + ":" + rover.CurrentPosition());
}
catch (Exception exception)
{
Console.WriteLine("Exception when proccessing commands for " + rover.Name + ":" + exception.Message);
}
}
}
