static void Main(string[] args)
{
string command = "";
// Get application folder.
string path = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
// Setup a state machine by reading the external domain specific language program.
Parser parser = new Parser();
StateMachine machine = parser.GetStateMachine(path + "\\dungeon.txt");
Console.WriteLine("Loading of External DSL completed.\n");
// Setup controller to run state machine.
Controller controller = new Controller(machine);
// Display some help.
Console.WriteLine("> Q = Quit, ? = Available Commands");
Console.WriteLine("> Entering the dungeon.");
// Execute the starting state.
controller.CurrentState.Execute();
// Read commands from user to activate state machine.
while (command.ToLower() != "q")
{
Console.Write("> ");
// Read a command.
command = Console.ReadLine();
// Send the command to our state machine.
HandleCommand(controller, command);
}
}
/// <summary>
/// Sends the command to the controller to handle.
/// </summary>
/// <param name="command">string</param>
/// <param name="controller">state machine controller</param>
private static void HandleCommand(Controller controller, string command)
{
if (!controller.Handle(command))
{
if (command == "?")
{
// Display available commands for the given state.
foreach (string eventCode in controller.CurrentState.GetEventCodes())
{
Console.WriteLine(eventCode);
}
}
else if (command.ToLower() != "q")
{
Console.WriteLine("Huh?");
}
}
}
public Parser()
{
// Setup a state machine with an internal DSL to handle parsing our code file.
// You could actually create an external DSL code file to program the Parser itself, but for this example, we'll just utilize the code with an internal DSL.
#region Setup Parser State Machine
// States
State idle = new State("idle");
State waitingForCommand = new State("waitingForCommand");
State waitingForCommandCode = new State("waitingForCommandCode");
State waitingForEvent = new State("waitingForEvent");
State waitingForEventCode = new State("waitingForEventCode");
State waitingForState = new State("waitingForState");
State waitingForAction = new State("waitingForAction");
State waitingForTransition = new State("waitingForTransition");
State waitingForTransitionState = new State("waitingForTransitionState");
// Events
Event readCommandStart = new Event("readCommandStart", _commandsToken);
Event readCommandCodeStart = new Event("readCommandCodeStart", _startCode);
Event readCommandCodeEnd = new Event("readCommandCodeEnd", _endCode);
Event readEventStart = new Event("readEventStart", _eventsToken);
Event readEventCodeStart = new Event("readEventCodeStart", _startCode);
Event readEventCodeEnd = new Event("readEventCodeEnd", _endCode);
Event readActionStart = new Event("readActionStart", _actionsToken);
Event readActionEnd = new Event("readActionEnd", _endCode);
Event readStateStart = new Event("readStateStart", _stateToken);
Event readTransitionStart = new Event("readTransitionEvent", _transitionsToken);
Event readTransitionState = new Event("readTransitionState", "=>");
Event readTransitionStateEnd = new Event("readTransitionStateEnd", _endCode);
Event endTransition = new Event("endTransition", ".");
Event resetEvent = new Event("resetEvent", _resetToken);
// Transitions
idle.AddTransition(readCommandStart, waitingForCommand);
idle.AddTransition(readEventStart, waitingForEvent);
idle.AddTransition(readStateStart, waitingForState);
waitingForCommand.AddTransition(readCommandCodeStart, waitingForCommandCode);
waitingForCommandCode.AddTransition(readCommandCodeEnd, waitingForCommand);
waitingForEvent.AddTransition(readEventCodeStart, waitingForEventCode);
waitingForEventCode.AddTransition(readEventCodeEnd, waitingForEvent);
waitingForState.AddTransition(readActionStart, waitingForAction);
waitingForState.AddTransition(readTransitionStart, waitingForTransition);
waitingForAction.AddTransition(readActionEnd, waitingForState);
waitingForTransition.AddTransition(readTransitionState, waitingForTransitionState);
waitingForTransition.AddTransition(endTransition, waitingForState);
waitingForTransitionState.AddTransition(readTransitionStateEnd, waitingForTransition);
// Setup state machine.
_stateMachine = new StateMachine(idle);
_stateMachine.AddResetEvent(resetEvent);
// Setup controller.
_controller = new Controller(_stateMachine);
#endregion
}
