public static CommandEntity GetCommand(
string commandLine
)
{
string cleanedString = System.Text.RegularExpressions.Regex.Replace(commandLine.Trim(), @"\s+", " ");
string[] split = cleanedString.Split(' ');
int paramcount = split.Length - 1;
string[] parameters = new string[paramcount];
Array.Copy(split, 1, parameters, 0, paramcount);
switch (split[0].ToUpper())
{
case "Q":
return(QuitCommand.CreateCommand(parameters));
case "C":
return(CanvasCommand.CreateCommand(parameters));
case "L":
return(LineCommand.CreateCommand(parameters));
case "R":
return(RectangleCommand.CreateCommand(parameters));
case "B":
return(BucketCommand.CreateCommand(parameters));
default:
string helpMessage = HelpCommand.CreateCommand().Message;
throw new InvalidCommandException("Unknown command \n" + helpMessage);
}
}
internal static HelpCommand CreateCommand()
{
StringBuilder sb = new StringBuilder();
sb.Append(CanvasCommand.GetHelp());
sb.Append(Environment.NewLine);
sb.Append(Environment.NewLine);
sb.Append(LineCommand.GetHelp());
sb.Append(Environment.NewLine);
sb.Append(Environment.NewLine);
sb.Append(RectangleCommand.GetHelp());
sb.Append(Environment.NewLine);
sb.Append(Environment.NewLine);
sb.Append(QuitCommand.GetHelp());
HelpCommand command = new HelpCommand(sb.ToString());
return(command);
}
internal static CanvasCommand CreateCommand(
string[] parameters
)
{
CanvasCommand command = null;
// Validate Mandatory
if (parameters.Length != 2)
{
throw new InvalidCommandParamsException("Expected 2 parameters but received " + parameters.Length + "\n" + GetHelp());
}
int width = -1;
int height = -1;
try
{
width = Utils.FormatPositiveInt(parameters[0]);
}
catch (Exception ex)
{
throw new InvalidCommandParamsException("Invalid width: " + parameters[0] + ".\n" + GetHelp(), ex);
}
try
{
height = Utils.FormatPositiveInt(parameters[1]);
}
catch (Exception ex)
{
throw new InvalidCommandParamsException("Invalid height: " + parameters[1] + ". \n" + GetHelp(), ex);
}
command = new CanvasCommand(
width,
height
);
return(command);
}