public ArithmeticStateMachine(VariableTable variables, FileManager fileManager)
{
CurrentState = ArithmeticMachineState.START;
transitions = new Dictionary <ArithmeticStateTransition, ArithmeticMachineState>
{
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.END), ArithmeticMachineState.START },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.INT), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.VAR), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.ARRAY), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.PLUS), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.MINUS), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.MULT), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.DIV), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.POWER), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.START, TokenType.OPENING_BRACES), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.INT), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.VAR), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.ARRAY), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.PLUS), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.MINUS), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.MULT), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.DIV), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.POWER), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.OPENING_BRACES), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.CLOSING_BRACES), ArithmeticMachineState.EXP },
{ new ArithmeticStateTransition(ArithmeticMachineState.EXP, TokenType.END), ArithmeticMachineState.START },
};
this.variables = variables;
this.command = new ArithmeticCommand(variables, fileManager);
}
public ArithmeticMachineState GetNext(Token token)
{
ArithmeticMachineState nextState = this.CurrentState;
ArithmeticStateTransition transition = new ArithmeticStateTransition(CurrentState, token.Type);
if (!transitions.TryGetValue(transition, out nextState))
{
throw new Exception("Arithmetic: Invalid transition: " + CurrentState + " -> " + nextState + "\n" + token.Text + " " + token.Type);
}
if (token.Type != TokenType.END)
{
this.command.ConsumeToken(token);
}
else
{
this.command.EndOfExpression();
}
Console.WriteLine("Arithmetic: " + this.CurrentState + " -> " + nextState + ": " + token.Text);
return(nextState);
}
public void MoveToNextState(Token token)
{
ArithmeticMachineState nextState = GetNext(token);
this.CurrentState = nextState;
}
public void Reset()
{
this.CurrentState = ArithmeticMachineState.START;
this.command.EndOfExpression();
}
public ArithmeticStateTransition(ArithmeticMachineState currentState, TokenType token)
{
this.CurrentState = currentState;
this.Token = token;
}