Minify tags

gistfile1.php

<?php

  /**
   * Minifies and removes unneeded cache tags.
   *
   * @param array $cache_tags
   *   List of cache tags.
   *
   * @return array
   *   Shortened and cleaned up cache tag list.
   */
  public function minifyTags(array $cache_tags) {
    $minified_tags = [];

    $has_node_list_tag = in_array('node_list', $cache_tags);
    $has_block_list_tag = in_array('config:block_list', $cache_tags);
    $add_menu_list_tag = FALSE;

    foreach ($cache_tags as $tag) {
      // Skip specific node tags if the list cache tag is present.
      if ($has_node_list_tag && strpos($tag, 'node:') !== FALSE) {
        continue;
      }

      // Skip specific block cache tags if the list cache tag is present.
      if ($has_block_list_tag && strpos($tag, 'config:block.block.') !== FALSE) {
        continue;
      }

      // Skip specific node tags if the list cache tag is present.
      if (strpos($tag, 'config:system.menu.') !== FALSE) {
        $add_menu_list_tag = TRUE;
        continue;
      }

      $minified_tags[] = $tag;
    };

    // @todo Replace this with a fancy algorithm.
    $replacements = [
      'config:' => 'c:',
      'block_content:' => 'bc:',
      'page_manager.page.' => 'pmp.',
      'file:' => 'f:',
      'taxonomy_term:' => 'tm:',
      'theme_global_setting' => 'tgs',
      'user:' => 'u:',
    ];

    // Shorten known cache tags.
    $minified_tags = str_replace(array_keys($replacements), array_values($replacements), $minified_tags);

    if ($add_menu_list_tag) {
      $minified_tags[] = 'c:menu_list';
    }
    return $minified_tags;
  }