cog.theme

<?php

/**
 * @file
 * Theme specific functionality.
 */

use Drupal\Component\Utility\Html;

/**
 * Implements hook_preprocess_html().
 */
function cog_preprocess_html(&$variables) {
  $system_path = \Drupal::service('path.current')->getPath();
  $page_path = explode('/', $system_path)[1];
  if (!empty($page_path)) {
    $variables['attributes']['class'][] = Html::cleanCssIdentifier('path--' . $page_path);
  }
}

/**
 * Implements template_preprocess_block().
 */
function cog_preprocess_block(&$variables) {
  // Custom block type helper classes.
  if (isset($variables['elements']['content']['#block_content'])) {
    $bundle = $variables['elements']['content']['#block_content']->bundle();
    $bundle_class = str_replace('_', '-', $bundle);
    if (isset($variables['attributes']['class'])) {
      $variables['attributes']['class'][] = Html::cleanCssIdentifier('block--bundle-' . $bundle_class);
      $variables['attributes']['data-bundle-class'] = $bundle_class;
    }
  }
}

/**
 * Implements hook_preprocess_node().
 */
function cog_preprocess_node(&$variables) {
  // Helper variables for multiple nodes.
  if (!empty($variables['elements']['#entity_type'])) {
    $variables['attributes']['class'][] = Html::cleanCssIdentifier('entity--type-' . $variables['elements']['#entity_type']);
  }
}