Proyectos de Subversion Moodle

<?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, $USER;

        // Trivial-cache - keyed on $cachedcourseid + $cacheduserid.

        static $cachedcourseid = null;

        static $cacheduserid = null;

        static $coursecontentlist = array();

        static $sitecontentlist = array();

        static $nothingtodo;

        // Try to get current course.

        $coursectx = $this->context->get_course_context(false);

        if (!$coursectx) {

            // We could be in a course category so no entries for courseid == 0 will be found.

            $courseid = 0;

        } else {

            $courseid = $coursectx->instanceid;

        }

        if ($cacheduserid !== $USER->id) {

            // Invalidate all caches if the user changed.

            $coursecontentlist = array();

            $sitecontentlist = array();

            $cacheduserid = $USER->id;

            $cachedcourseid = $courseid;

            $nothingtodo = false;

        } else if ($courseid != get_site()->id && $courseid != 0 && $cachedcourseid != $courseid) {

            // Invalidate course-level caches if the course id changed.

            $coursecontentlist = array();

            $cachedcourseid = $courseid;

            $nothingtodo = false;

        }

        if ($nothingtodo === true) {

            return $text;

        }

        // If courseid == 0 only site entries will be returned.

        if ($courseid == get_site()->id || $courseid == 0) {

            $contentlist = & $sitecontentlist;

        } else {

            $contentlist = & $coursecontentlist;

        }

        // 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="'.s($content->content).'" '.

                                  'href="'.$CFG->wwwroot.'/mod/data/view.php?d='.$content->dataid.

                                  '&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;

        }

    }

}