lazy-content.yaml

meta:
  tokens:
    newest_member:
      callback: vc_cache
      arguments:
        options: { expire: '+ 15 minutes' }
        callback: Drupal\lgstatic\Util\Stats::systemNewestMember
    total_members:
      callback: vc_cache
      arguments:
        options: { expire: '+ 15 minutes' }
        callback: Drupal\lgstatic\Util\Stats::systemMemberStats

und:
  meta:
    use token: 1 # Default is 0
  subject: Member Stats
  content:
    '#theme': item_list
    '#items':
      - Tổng thành viên %total_members
      - Thành viên mới nhất %newest_member

en:
  subject: Duis eget arcu quis arcu accumsan porta
  content:
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus id massa
    libero, eget porttitor ligula. Duis eget arcu quis arcu accumsan porta.
    Class aptent taciti sociosqu ad litora torquent per conubia nostra, per
    inceptos himenaeos. Aliquam a faucibus augue. Fusce in nisl nec tellus
    pharetra vehicula. Ut interdum nulla fermentum purus placerat tincidunt.
    Fusce a arcu vel justo congue dictum quis venenatis ipsum. Pellentesque at
    nisi arcu. Duis blandit nulla id quam adipiscing pulvinar. Nulla mattis
    aliquam ipsum, ut mollis nisi elementum ac. Proin erat ipsum, lobortis in
    sodales id, pretium vitae purus. Proin ornare condimentum egestas. Sed sed
    massa justo, eget feugiat velit. Mauris vitae orci eu turpis vehicula
    egestas vel vel enim.

Vc_Lazy_Content.php

<?php
/**
 * @file lib/Lazy/Content.php
 */

class Vc_Lazy_Content {
  public static function trying() {
    $file = '/path/to/system_members_stats.yaml';
    if (!$content = yaml_parse_file($file)) return FALSE;
    $tokens = self::buildMetaToken($content);
  }

  public static function buildMetaToken($content) {
    if (!isset($content['meta'])) return FALSE;
    if (!isset($content['meta']['tokens'])) return FALSE;
    $tokens = &$content['meta']['tokens'];

    $results = array();
    foreach ($tokens as $token => $info) {
      if (empty($info['callback'])) {
        $results[$token] = NULL;
      }

      $callback = $info['callback'];
      $arguments = isset($info['arguments']) ? $info['arguments'] : array();

      # kpr($callback); kpr($arguments);

      $results[$token] = call_user_func_array($callback, $arguments);
    }

    return $results;
  }
}