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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/>.

/**
 * HTML  tidy text filter.
 *
 * @package    filter
 * @subpackage tiny
 * @copyright  2004 Hannes Gassert <hannes at mediagonal dot ch>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

// This class looks for text including markup and
// applies tidy's repair function to it.
// Tidy is a HTML clean and
// repair utility, which is currently available for PHP 4.3.x and PHP 5 as a
// PECL extension from http://pecl.php.net/package/tidy, in PHP 5 you need only
// to compile using the --with-tidy option.
// If you don't have the tidy extension installed or don't know, you can enable
// or disable this filter, it just won't have any effect.
// If you want to know what you can set in $tidyoptions and what their default
// values are, see http://php.net/manual/en/function.tidy-get-config.php.

class filter_tidy extends moodle_text_filter {
    function filter($text, array $options = array()) {

/// Configuration for tidy. Feel free to tune for your needs, e.g. to allow
    /// proprietary markup.
        $tidyoptions = array(
                 'output-xhtml' => true,
                 'show-body-only' => true,
                 'tidy-mark' => false,
                 'drop-proprietary-attributes' => true,
                 'drop-font-tags' => true,
                 'drop-empty-paras' => true,
                 'indent' => true,
                 'quiet' => true,
        );

/// Do a quick check using strpos to avoid unnecessary work
        if (strpos($text, '<') === false) {
            return $text;
        }

/// If enabled: run tidy over the entire string
        if (function_exists('tidy_repair_string')){
            $text = tidy_repair_string($text, $tidyoptions, 'utf8');
        }

return $text;
    }
}