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* @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\Form\Rule; \defined('JPATH_PLATFORM') or die; use Joomla\CMS\Form\Form; use Joomla\CMS\Form\FormRule; use Joomla\Registry\Registry; /** * Form Rule class for the Joomla Platform. * * @since 1.7.0 */ class ColorRule extends FormRule { /** * Method to test for a valid color in hexadecimal. * * @param \SimpleXMLElement $element The SimpleXMLElement object representing the `
` 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. * * @since 1.7.0 */ 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($value)) { return true; } if ($value[0] != '#') { return false; } // Remove the leading # if present to validate the numeric part $value = ltrim($value, '#'); // The value must be 6 or 3 characters long if (!((\strlen($value) == 6 || \strlen($value) == 3) && ctype_xdigit($value))) { return false; } return true; } }