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<?php
namespace Drupal\Core\Form;
use Drupal\Core\Render\Element;
/**
* Provides helpers to operate on forms.
*
* @ingroup form_api
*/
class FormHelper {
/**
* Rewrite #states selectors.
*
* @param array $elements
* A renderable array element having a #states property.
* @param string $search
* A partial or entire jQuery selector string to replace in #states.
* @param string $replace
* The string to replace all instances of $search with.
*
* @see drupal_process_states()
*/
public static function rewriteStatesSelector(array &$elements, $search, $replace) {
if (!empty($elements['#states'])) {
foreach ($elements['#states'] as $state => $ids) {
static::processStatesArray($elements['#states'][$state], $search, $replace);
}
}
foreach (Element::children($elements) as $key) {
static::rewriteStatesSelector($elements[$key], $search, $replace);
}
}
/**
* Helper function for self::rewriteStatesSelector().
*
* @param array $conditions
* States conditions array.
* @param string $search
* A partial or entire jQuery selector string to replace in #states.
* @param string $replace
* The string to replace all instances of $search with.
*/
protected static function processStatesArray(array &$conditions, $search, $replace) {
// Retrieve the keys to make it easy to rename a key without changing the
// order of an array.
$keys = array_keys($conditions);
$update_keys = FALSE;
foreach ($conditions as $id => $values) {
if (strpos($id, $search) !== FALSE) {
$update_keys = TRUE;
$new_id = str_replace($search, $replace, $id);
// Replace the key and keep the array in the same order.
$index = array_search($id, $keys, TRUE);
$keys[$index] = $new_id;
}
elseif (is_array($values)) {
static::processStatesArray($conditions[$id], $search, $replace);
}
}
// Updates the states conditions keys if necessary.
if ($update_keys) {
$conditions = array_combine($keys, array_values($conditions));
}
}
}