/**
* {@inheritdoc}
*
*
*/
public function submitForm(array &$form, FormStateInterface $form_state)
{
$c = new Conversion();
$val = $form_state->getValue('length');
$from = $form_state->getValue('unit');
$to = $form_state->getValue('units');
print_r('input');
print_r($val);
//$result = $c->assign($from,$val);
drupal_set_message($this->t('Your result is @length @unit', array('@length' => $c->convertlength($from, $val, $to), '@unit' => $form_state->getValue('units'))));
}
