public GoSubStateMachine(VariableTable variables, FileManager fileManager)
{
CurrentState = GoSubMachineState.START;
transitions = new Dictionary <GoSubStateTransition, GoSubMachineState>
{
{ new GoSubStateTransition(GoSubMachineState.START, TokenType.END), GoSubMachineState.START },
{ new GoSubStateTransition(GoSubMachineState.START, TokenType.GOSUB), GoSubMachineState.GOSUB },
{ new GoSubStateTransition(GoSubMachineState.GOSUB, TokenType.INT), GoSubMachineState.LABEL },
{ new GoSubStateTransition(GoSubMachineState.LABEL, TokenType.END), GoSubMachineState.START }
};
this.variables = variables;
this.command = new GoSubCommand(variables, fileManager);
}
public GoSubMachineState GetNext(Token token)
{
GoSubMachineState nextState = this.CurrentState;
GoSubStateTransition transition = new GoSubStateTransition(CurrentState, token.Type);
if (!transitions.TryGetValue(transition, out nextState))
{
throw new Exception("GOSUB: Invalid transition: " + CurrentState + " -> " + nextState + "\n" + token.Text + " " + token.Type);
}
if (this.CurrentState == GoSubMachineState.GOSUB && token.Type == TokenType.INT)
{
this.command.ConsumeToken(token);
}
Console.WriteLine("GOSUB: " + this.CurrentState + " -> " + nextState + ": " + token.Text);
return(nextState);
}
public GoSubStateTransition(GoSubMachineState currentState, TokenType token)
{
this.CurrentState = currentState;
this.Token = token;
}
public void MoveToNextState(Token token)
{
GoSubMachineState nextState = GetNext(token);
this.CurrentState = nextState;
}
