/**
* @param \Khaos\FSM\State\State $initialState
* @param \Khaos\FSM\Stateful $context
* @param \Khaos\FSM\Transition\Transition $t1
* @param \Khaos\FSM\Transition\Transition $t2
* @param \Khaos\FSM\State\State $s1
* @param \Khaos\FSM\State\State $s2
*/
function let($initialState, $context, $t1, $t2, $s1, $s2)
{
$context->setCurrentState($initialState)->willReturn();
$context->getCurrentState()->willReturn($initialState);
$this->beConstructedWith($initialState, $context);
$t1->can('t1', $context, $this->getWrappedObject())->willReturn(true);
$t1->can(Argument::any(), $context, $this->getWrappedObject())->willReturn(false);
$t1->apply('t1', $context, $this->getWrappedObject())->willReturn('S1');
$t1->getTo()->willReturn($s1);
$t2->can('t2', $context, $this->getWrappedObject())->willReturn(true);
$t2->can(Argument::any(), $context, $this->getWrappedObject())->willReturn(false);
$t2->apply('t2', $context, $this->getWrappedObject())->willReturn('S2');
$t2->getTo()->willReturn($s2);
$initialState->getTransitions()->willReturn([$t1, $t2]);
}
/**
* Can Advance
*
* Determine if the machine can be advanced, if so return the
* valid transition.
*
* Usage :-
*
* can(Input)
* can(Input, Transition)
*
* @param mixed $input Input against which transition(s) will be tested
* @param Transition $transition If specified only this transition will be tested
*
* @return Transition|false
* @throws Exception
*/
public function can($input, $transition = null)
{
$state = $this->context->getCurrentState();
if (!$transition instanceof Transition) {
foreach ($state->getTransitions() as $candidate) {
if (!$candidate->can($input, $this->context, $this)) {
continue;
}
return $candidate;
}
return false;
}
return $transition->can($input, $this->context, $this) ? $transition : false;
}
/**
* Apply Transition
*
* @param Transition $candidate
*
* @return mixed[]|null
*/
private function apply($candidate)
{
if (($output = $candidate->apply($this->input, $this->context, $this)) !== null) {
$this->output[] = $output;
}
return $this->backtrack();
}
