public IfMachineState GetNext(Token token)
{
IfMachineState nextState = this.CurrentState;
IfStateTransition transition = new IfStateTransition(CurrentState, token.Type);
if ((this.CurrentState == IfMachineState.IF_FIRST_EXP && !this.IsComparator(token)) ||
(this.CurrentState == IfMachineState.COMPARISON && token.Type != TokenType.THEN))
{
this.exp.MoveToNextState(token);
}
else if (!transitions.TryGetValue(transition, out nextState))
{
throw new Exception("Invalid transition: " + CurrentState + " -> " + nextState + "\n" + token.Text + " " + token.Type);
}
if ((nextState == IfMachineState.COMPARISON && this.IsComparator(token)) ||
(nextState == IfMachineState.DESTINATION && token.Type == TokenType.THEN))
{
this.exp.Reset();
if (nextState == IfMachineState.COMPARISON && this.IsComparator(token))
{
this.comparison = token;
this.command.MoveResultToSecondRegister();
}
}
else if (nextState == IfMachineState.START && token.Type != TokenType.END)
{
this.destination = int.Parse(token.Text);
this.command.IfInstructions(this.destination, this.comparison);
this.comparison = null;
this.destination = 0;
}
Console.WriteLine("IF: " + this.CurrentState + " -> " + nextState + ": " + token.Text);
return(nextState);
}
public override bool Equals(object obj)
{
IfStateTransition other = obj as IfStateTransition;
return(other != null && this.CurrentState == other.CurrentState && this.Token == other.Token);
}