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Code Editor : filter.php

<?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/>.

/**
 * This filter provides automatic linking to database activity entries
 * when found inside every Moodle text.
 *
 * @package    filter
 * @subpackage data
 * @copyright  2006 Vy-Shane Sin Fat
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * Database activity filtering
 */
class filter_data extends moodle_text_filter {

public function filter($text, array $options = array()) {
        global $CFG, $DB;

// Trivial-cache - keyed on $cachedcontextid
        static $cachedcontextid;
        static $contentlist;

static $nothingtodo;

// Try to get current course
        if (!$courseid = get_courseid_from_context($this->context)) {
            $courseid = 0;
        }

// Initialise/invalidate our trivial cache if dealing with a different context
        if (!isset($cachedcontextid) || $cachedcontextid !== $this->context->id) {
            $cachedcontextid = $this->context->id;
            $contentlist = array();
            $nothingtodo = false;
        }

if ($nothingtodo === true) {
            return $text;
        }

// Create a list of all the resources to search for. It may be cached already.
        if (empty($contentlist)) {
            $coursestosearch = $courseid ? array($courseid) : array(); // Add courseid if found
            if (get_site()->id != $courseid) { // Add siteid if was not courseid
                $coursestosearch[] = get_site()->id;
            }
            // We look for text field contents only if have autolink enabled (param1)
            list ($coursesql, $params) = $DB->get_in_or_equal($coursestosearch);
            $sql = 'SELECT dc.id AS contentid, dr.id AS recordid, dc.content AS content, d.id AS dataid
                      FROM {data} d
                      JOIN {data_fields} df ON df.dataid = d.id
                      JOIN {data_records} dr ON dr.dataid = d.id
                      JOIN {data_content} dc ON dc.fieldid = df.id AND dc.recordid = dr.id
                     WHERE d.course ' . $coursesql . '
                       AND df.type = \'text\'
                       AND ' . $DB->sql_compare_text('df.param1', 1) . " = '1'";

if (!$contents = $DB->get_records_sql($sql, $params)) {
                $nothingtodo = true;
                return $text;
            }

foreach ($contents as $key => $content) {
                // Trim empty or unlinkable concepts
                $currentcontent = trim(strip_tags($content->content));
                if (empty($currentcontent)) {
                    unset($contents[$key]);
                    continue;
                } else {
                    $contents[$key]->content = $currentcontent;
                }

// Rule out any small integers.  See bug 1446
                $currentint = intval($currentcontent);
                if ($currentint && (strval($currentint) == $currentcontent) && $currentint < 1000) {
                    unset($contents[$key]);
                }
            }

if (empty($contents)) {
                $nothingtodo = true;
                return $text;
            }

usort($contents, 'filter_data::sort_entries_by_length');

foreach ($contents as $content) {
                $href_tag_begin = '<a class="data autolink dataid'.$content->dataid.'" title="'.$content->content.'" '.
                                  'href="'.$CFG->wwwroot.'/mod/data/view.php?d='.$content->dataid.
                                  '&amp;rid='.$content->recordid.'">';
                $contentlist[] = new filterobject($content->content, $href_tag_begin, '</a>', false, true);
            }

$contentlist = filter_remove_duplicates($contentlist); // Clean dupes
        }
        return filter_phrases($text, $contentlist);  // Look for all these links in the text
    }

private static function sort_entries_by_length($content0, $content1) {
        $len0 = strlen($content0->content);
        $len1 = strlen($content1->content);

if ($len0 < $len1) {
            return 1;
        } else if ($len0 > $len1) {
            return -1;
        } else {
            return 0;
        }
    }
}

${this.title}

Code Editor : filter.php