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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Mustache helper that will add JS to the end of the page.
  19   *
  20   * @package    core
  21   * @category   output
  22   * @copyright  2015 Damyon Wiese
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  namespace core\output;
  27  
  28  /**
  29   * Lazy create a uniqid per instance of the class. The id is only generated
  30   * when this class it converted to a string.
  31   *
  32   * @copyright  2015 Damyon Wiese
  33   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  34   * @since      2.9
  35   */
  36  class mustache_uniqid_helper {
  37  
  38      /** @var string $uniqid The unique id */
  39      private $uniqid = null;
  40  
  41      /**
  42       * Init the random variable and return it as a string.
  43       *
  44       * @return string random id.
  45       */
  46      public function __toString() {
  47          if ($this->uniqid === null) {
  48              $this->uniqid = \html_writer::random_id(uniqid());
  49          }
  50          return $this->uniqid;
  51      }
  52  }