public ReadStateMachine(VariableTable variables, FileManager fileManager)
{
CurrentState = ReadMachineState.START;
transitions = new Dictionary <ReadStateTransition, ReadMachineState>
{
{ new ReadStateTransition(ReadMachineState.START, TokenType.READ), ReadMachineState.READ },
{ new ReadStateTransition(ReadMachineState.READ, TokenType.VAR), ReadMachineState.READ_ELEMENT },
{ new ReadStateTransition(ReadMachineState.READ, TokenType.ARRAY), ReadMachineState.READ_ELEMENT },
{ new ReadStateTransition(ReadMachineState.READ_ELEMENT, TokenType.COMMA), ReadMachineState.COMMA },
{ new ReadStateTransition(ReadMachineState.READ_ELEMENT, TokenType.END), ReadMachineState.START },
{ new ReadStateTransition(ReadMachineState.COMMA, TokenType.VAR), ReadMachineState.READ_ELEMENT },
{ new ReadStateTransition(ReadMachineState.COMMA, TokenType.ARRAY), ReadMachineState.READ_ELEMENT },
{ new ReadStateTransition(ReadMachineState.COMMA, TokenType.END), ReadMachineState.START }
};
this.variables = variables;
this.command = new ReadCommand(variables, fileManager);
}
public ReadMachineState GetNext(Token token)
{
ReadMachineState nextState = this.CurrentState;
ReadStateTransition transition = new ReadStateTransition(CurrentState, token.Type);
if (!transitions.TryGetValue(transition, out nextState))
{
throw new Exception("READ: Invalid transition: " + CurrentState + " -> " + nextState + "\n" + token.Text + " " + token.Type);
}
if (this.CurrentState == ReadMachineState.START)
{
this.variables.ResetReadVariables();
}
else if ((this.CurrentState == ReadMachineState.READ || this.CurrentState == ReadMachineState.COMMA) &&
(token.Type == TokenType.VAR || token.Type == TokenType.ARRAY))
{
this.command.ConsumeToken(token);
}
Console.WriteLine("READ: " + this.CurrentState + " -> " + nextState + ": " + token.Text);
return(nextState);
}
public ReadStateTransition(ReadMachineState currentState, TokenType token)
{
this.CurrentState = currentState;
this.Token = token;
}
public void MoveToNextState(Token token)
{
ReadMachineState nextState = GetNext(token);
this.CurrentState = nextState;
}