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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 4.0.0 */ class CssIdentifierRule extends FormRule { /** * Method to test if the file path is valid * * @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 4.0.0 */ public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null) { // 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) && $value !== '0') { return true; } // Make sure we allow multiple classes to be added $cssIdentifiers = explode(' ', $value); foreach ($cssIdentifiers as $i => $identifier) { /** * The following regex rules are based on the Html::cleanCssIdentifier method from Drupal * https://github.com/drupal/drupal/blob/8.8.5/core/lib/Drupal/Component/Utility/Html.php#L116-L130 * * with the addition for Joomla that we allow the colon (U+003A). */ /** * Valid characters in a CSS identifier are: * - the hyphen (U+002D) * - a-z (U+0030 - U+0039) * - A-Z (U+0041 - U+005A) * - the underscore (U+005F) * - the colon (U+003A) * - 0-9 (U+0061 - U+007A) * - ISO 10646 characters U+00A1 and higher */ if (preg_match('/[^\\x{002D}\\x{0030}-\\x{0039}\\x{0041}-\\x{005A}\\x{005F}\\x{003A}\\x{0061}-\\x{007A}\\x{00A1}-\\x{FFFF}]/u', $identifier)) { return false; } /** * Full identifiers cannot start with a digit, two hyphens, or a hyphen followed by a digit. */ if (preg_match('/^[0-9]/', $identifier) || preg_match('/^(-[0-9])|^(--)/', $identifier)) { return false; } } return true; } }