theming.module

<?php

/**
 * @file
 * Hook implementations for the theming module.
 */

/**
 * Implements hook_theme_registry_alter().
 */
function theming_theme_registry_alter(&$hooks) {
  $path = drupal_get_path('module', 'theming');
  $file = 'theming.theme.inc';
  $override = [
    'form_element',
    'form_element_label',
  ];
  foreach ($override as $name) {
    $hook = &$hooks[$name];
    // Only replace the theme function when no theme overrides it.
    if ($hook['function'] == "theme_$name") {
      $hook['theme path'] = $path;
      $hook['file'] = $file;
      $hook['function'] = "theming_$name";
    }
    $hook['includes'][] = "$path/$file";
    // Depending on whether theming.theme.inc was included already the
    // prepocess function might have been detected automatically.
    // Make sure it’s added exactly once.
    $hook['preprocess functions'][] = "theming_preprocess_$name";
    $hook['preprocess functions'] = array_unique($hook['preprocess functions']);
  }
}

/**
 * Implements hook_element_info_alter().
 */
function theming_element_info_alter(&$info) {
  // Replace the default #pre_render callback for scripts.
  $info['scripts']['#pre_render'] = array_map(function ($hook) {
    return $hook == 'drupal_pre_render_scripts' ? 'theming_pre_render_scripts' : $hook;
  }, $info['scripts']['#pre_render']);
}

/**
 * Wrap drupal_pre_render_scripts() to add custom attributes to script tags.
 */
function theming_pre_render_scripts(array $elements) {
  $processed_elements = drupal_pre_render_scripts($elements);
  foreach (element_children($processed_elements['scripts']) as $index) {
    // Skip aggregated scripts.
    if (is_string($processed_elements['scripts'][$index])) {
      continue;
    }
    $attributes = &$processed_elements['scripts'][$index]['#attributes'];
    if ($src = $attributes['src'] ?? NULL) {
      $custom_attributes = $elements['#items'][$src]['attributes'] ?? [];
      $attributes = $custom_attributes + $attributes;
    }
  }
  return $processed_elements;
}