public GoStateMachine(FileManager fileManager)
{
CurrentState = GoMachineState.START;
transitions = new Dictionary <GoStateTransition, GoMachineState>
{
{ new GoStateTransition(GoMachineState.START, TokenType.END), GoMachineState.START },
{ new GoStateTransition(GoMachineState.START, TokenType.GO), GoMachineState.GO },
{ new GoStateTransition(GoMachineState.START, TokenType.GOTO), GoMachineState.TO },
{ new GoStateTransition(GoMachineState.GO, TokenType.TO), GoMachineState.TO },
{ new GoStateTransition(GoMachineState.TO, TokenType.INT), GoMachineState.DESTINATION },
{ new GoStateTransition(GoMachineState.DESTINATION, TokenType.END), GoMachineState.START },
};
this.command = new GoCommand(fileManager);
}
public GoMachineState GetNext(Token token)
{
GoMachineState nextState = this.CurrentState;
GoStateTransition transition = new GoStateTransition(CurrentState, token.Type);
if (!transitions.TryGetValue(transition, out nextState))
{
throw new Exception("Invalid transition: " + CurrentState + " -> " + nextState + "\n" + token.Text + " " + token.Type);
}
if (nextState == GoMachineState.DESTINATION && token.Type != TokenType.END)
{
this.command.ConsumeToken(token);
}
Console.WriteLine("P: " + this.CurrentState + " -> " + nextState + ": " + token.Text);
return(nextState);
}
public GoStateTransition(GoMachineState currentState, TokenType token)
{
this.CurrentState = currentState;
this.Token = token;
}
public void MoveToNextState(Token token)
{
GoMachineState nextState = GetNext(token);
this.CurrentState = nextState;
}
