function filter($text, array $options = array())
{
global $USER;
// Since 2.7 we can finally start using globals in filters.
$coursectx = $this->context->get_course_context(false);
if (!$coursectx) {
return $text;
}
$courseid = $coursectx->instanceid;
// Initialise/invalidate our trivial cache if dealing with a different course.
if (!isset(self::$cachedcourseid) || self::$cachedcourseid !== (int) $courseid) {
self::$activitylist = null;
}
self::$cachedcourseid = (int) $courseid;
// And the same for user id.
if (!isset(self::$cacheduserid) || self::$cacheduserid !== (int) $USER->id) {
self::$activitylist = null;
}
self::$cacheduserid = (int) $USER->id;
/// It may be cached
if (is_null(self::$activitylist)) {
self::$activitylist = array();
$modinfo = get_fast_modinfo($courseid);
if (!empty($modinfo->cms)) {
self::$activitylist = array();
// We will store all the created filters here.
// Create array of visible activities sorted by the name length (we are only interested in properties name and url).
$sortedactivities = array();
foreach ($modinfo->cms as $cm) {
// Use normal access control and visibility, but exclude labels and hidden activities.
if ($cm->visible and $cm->has_view() and $cm->uservisible) {
$sortedactivities[] = (object) array('name' => $cm->name, 'url' => $cm->url, 'id' => $cm->id, 'namelen' => -strlen($cm->name));
}
}
// Sort activities by the length of the activity name in reverse order.
core_collator::asort_objects_by_property($sortedactivities, 'namelen', core_collator::SORT_NUMERIC);
foreach ($sortedactivities as $cm) {
$title = s(trim(strip_tags($cm->name)));
$currentname = trim($cm->name);
$entitisedname = s($currentname);
// Avoid empty or unlinkable activity names.
if (!empty($title)) {
$href_tag_begin = html_writer::start_tag('a', array('class' => 'autolink', 'title' => $title, 'href' => $cm->url));
self::$activitylist[$cm->id] = new filterobject($currentname, $href_tag_begin, '</a>', false, true);
if ($currentname != $entitisedname) {
// If name has some entity (& " < >) add that filter too. MDL-17545.
self::$activitylist[$cm->id . '-e'] = new filterobject($entitisedname, $href_tag_begin, '</a>', false, true);
}
}
}
}
}
$filterslist = array();
if (self::$activitylist) {
$cmid = $this->context->instanceid;
if ($this->context->contextlevel == CONTEXT_MODULE && isset(self::$activitylist[$cmid])) {
// remove filterobjects for the current module
$filterslist = array_values(array_diff_key(self::$activitylist, array($cmid => 1, $cmid . '-e' => 1)));
} else {
$filterslist = array_values(self::$activitylist);
}
}
if ($filterslist) {
return $text = filter_phrases($text, $filterslist);
} else {
return $text;
}
}
