<?php /** * Validates contents based on NMTOKENS attribute type. */ class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef { public function validate($string, $config, $context) { $string = trim($string); // early abort: '' and '0' (strings that convert to false) are invalid if (!$string) return false; $tokens = $this->split($string, $config, $context); $tokens = $this->filter($tokens, $config, $context); if (empty($tokens)) return false; return implode(' ', $tokens); } /** * Splits a space separated list of tokens into its constituent parts. */ protected function split($string, $config, $context) { // OPTIMIZABLE! // do the preg_match, capture all subpatterns for reformulation // we don't support U+00A1 and up codepoints or // escaping because I don't know how to do that with regexps // and plus it would complicate optimization efforts (you never // see that anyway). $pattern = '/(?:(?<=\s)|\A)'. // look behind for space or string start '((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)'. '(?:(?=\s)|\z)/'; // look ahead for space or string end preg_match_all($pattern, $string, $matches); return $matches[1]; } /** * Template method for removing certain tokens based on arbitrary criteria. * @note If we wanted to be really functional, we'd do an array_filter * with a callback. But... we're not. */ protected function filter($tokens, $config, $context) { return $tokens; } } // vim: et sw=4 sts=4