public function answer(KnowledgeState $state)
{
$state_value = $state->value($this->name);
foreach ($this->answers as $answer) {
$answer_value = $answer->value;
// If this is the default option, return it always.
if ($answer_value === null) {
return $answer;
}
// If the value is a variable, try to resolve it.
if (KnowledgeState::is_variable($answer_value)) {
$answer_value = $state->resolve($answer_value);
}
if ($state_value == $answer_value) {
return $answer;
}
}
// We didn't find an appropriate answer :O
return null;
}
