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<?php
/**
 * @package    Joomla.Component.Builder
 *
 * @created    30th April, 2015
 * @author     Llewellyn van der Merwe
<http://www.joomlacomponentbuilder.com>
 * @github     Joomla Component Builder
<https://github.com/vdm-io/Joomla-Component-Builder>
 * @copyright  Copyright (C) 2015 Vast Development Method. All rights
reserved.
 * @license    GNU General Public License version 2 or later; see
LICENSE.txt
 */

// No direct access to this file
defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Registry\Registry;

/**
 * Form Rule (Guid) class for the Joomla Platform.
 */
class JFormRuleGuid extends FormRule
{
	/**
	 * Method to test for a Globally Unique Identifier.
	 *
	 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object
representing the `<field>` tag for the form field object.
	 * @param   mixed              $value    The form field value to validate.
	 * @param   string             $group    The field name group control
value. This acts as an array container for the field.
	 *                                       For example if the field has
name="foo" and the group value is set to "bar" then the
	 *                                       full field name would end up
being "bar[foo]".
	 * @param   Registry           $input    An optional Registry object with
the entire data set to validate against the entire form.
	 * @param   Form               $form     The form object for which the
field is being tested.
	 *
	 * @return  boolean  True if the value is valid, false otherwise.
	 *
	 */
	public function test(\SimpleXMLElement $element, $value, $group = null,
Registry $input = null, Form $form = null)
	{
		$value = trim($value);

		// If the field is empty and not required, the field is valid.
		$required = ((string) $element['required'] == 'true'
|| (string) $element['required'] == 'required');

		if (!$required && empty($value))
		{
			return true;
		}

		// thanks to Lewie https://stackoverflow.com/a/1515456/1429677
		return
preg_match("/^(\{)?[a-f\d]{8}(-[a-f\d]{4}){4}[a-f\d]{8}(?(1)\})$/i",
$value);
	}

}