/**
* Wrap a field's callback to ensure that a reference to the helper is
* always supplied as the first argument to the callback.
*
* @param callable $callable
* @param FieldInterface $field
* @return callable
*/
protected function wrapCallable(callable $callable, FieldInterface $field = null)
{
return function () use($callable, $field) {
$arguments = func_get_args();
array_unshift($arguments, $this);
$output = call_user_func_array($callable, $arguments);
if ($field) {
/* @var $filter callable */
foreach ($field->getHelperFilters($this->name) as $filter) {
$filterArguments = $arguments;
array_unshift($filterArguments, $output);
$output = call_user_func_array($filter, $filterArguments);
}
}
return $output;
};
}
