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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Mustache helper that will add JS to the end of the page.
 *
 * @package    core
 * @category   output
 * @copyright  2015 Damyon Wiese
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core\output;

/**
 * Lazy create a uniqid per instance of the class. The id is only generated
 * when this class it converted to a string.
 *
 * @copyright  2015 Damyon Wiese
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since      2.9
 */
class mustache_uniqid_helper {

    /** @var string $uniqid The unique id */
    private $uniqid = null;

    /**
     * Init the random variable and return it as a string.
     *
     * @return string random id.
     */
    public function __toString() {
        if ($this->uniqid === null) {
            $this->uniqid = \html_writer::random_id(uniqid());
        }
        return $this->uniqid;
    }
}