/**
* Manages theme alter hooks as classes and allows sub-themes to sub-class.
*
* @param string $function
* The procedural function name of the alter (e.g. __FUNCTION__).
* @param mixed $data
* The variable that was passed to the hook_TYPE_alter() implementation to
* be altered. The type of this variable depends on the value of the $type
* argument. For example, when altering a 'form', $data will be a structured
* array. When altering a 'profile', $data will be an object.
* @param mixed $context1
* (optional) An additional variable that is passed by reference.
* @param mixed $context2
* (optional) An additional variable that is passed by reference. If more
* context needs to be provided to implementations, then this should be an
* associative array as described above.
*/
public static function alter($function, &$data, &$context1 = NULL, &$context2 = NULL)
{
static $theme;
if (!isset($theme)) {
$theme = self::getTheme();
}
// Immediately return if the active theme is not Bootstrap based.
if (!$theme->subthemeOf('materialize')) {
return;
}
// Extract the alter hook name.
$hook = Unicode::extractHook($function, 'alter');
// Handle form alters separately.
if (strpos($hook, 'form') === 0) {
$form_id = $context2;
if (!$form_id) {
$form_id = Unicode::extractHook($function, 'alter', 'form');
}
// Due to a core bug that affects admin themes, we should not double
// process the "system_theme_settings" form twice in the global
// hook_form_alter() invocation.
// @see https://drupal.org/node/943212
if ($context2 === 'system_theme_settings') {
return;
}
// Retrieve a list of form definitions.
$form_manager = new FormManager($theme);
/** @var \Drupal\bootstrap\Plugin\Form\FormInterface $form */
if ($form_manager->hasDefinition($form_id) && ($form = $form_manager->createInstance($form_id, ['theme' => $theme]))) {
$data['#submit'][] = [get_class($form), 'submitForm'];
$data['#validate'][] = [get_class($form), 'validateForm'];
$form->alterForm($data, $context1, $context2);
}
} else {
// Retrieve a list of alter definitions.
$alter_manager = new AlterManager($theme);
/** @var \Drupal\bootstrap\Plugin\Alter\AlterInterface $class */
if ($alter_manager->hasDefinition($hook) && ($class = $alter_manager->createInstance($hook, ['theme' => $theme]))) {
$class->alter($data, $context1, $context2);
}
}
}
