Issue #2152221 by IshaDakota, steveoliver, joelpittet, InternetDevels, rteijeiro, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_radios() to Twig

core/includes/form.inc

@@ -1116,30 +1116,30 @@ function form_pre_render_radio($element) {
 }
 
 /**
- * Returns HTML for a set of radio button form elements.
+ * Prepares variables for radios templates.
  *
- * @param $variables
+ * Default template: radios.html.twig.
+ *
+ * @param array $variables
  *   An associative array containing:
  *   - element: An associative array containing the properties of the element.
  *     Properties used: #title, #value, #options, #description, #required,
  *     #attributes, #children.
- *
- * @ingroup themeable
  */
-function theme_radios($variables) {
+function template_preprocess_radios(&$variables) {
   $element = $variables['element'];
-  $attributes = array();
+  $variables['attributes'] = array();
   if (isset($element['#id'])) {
-    $attributes['id'] = $element['#id'];
+    $variables['attributes']['id'] = $element['#id'];
   }
-  $attributes['class'] = 'form-radios';
+  $variables['attributes']['class'][] = 'form-radios';
   if (!empty($element['#attributes']['class'])) {
-    $attributes['class'] .= ' ' . implode(' ', $element['#attributes']['class']);
+    $variables['attributes']['class'] = array_merge($variables['attributes']['class'], $element['#attributes']['class']);
   }
   if (isset($element['#attributes']['title'])) {
-    $attributes['title'] = $element['#attributes']['title'];
+    $variables['attributes']['title'] = $element['#attributes']['title'];
   }
-  return '<div' . new Attribute($attributes) . '>' . (!empty($element['#children']) ? $element['#children'] : '') . '</div>';
+  $variables['children'] = $element['#children'];
 }
 
 /**

core/includes/theme.inc

@@ -2877,6 +2877,7 @@ function drupal_common_theme() {
     ),
     'radios' => array(
       'render element' => 'element',
+      'template' => 'radios',
     ),
     'date' => array(
       'render element' => 'element',

core/modules/system/templates/radios.html.twig

@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a 'radios' #type form element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The rendered radios.
+ *
+ * @see template_preprocess_radios()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes }}>{{ children }}</div>