/**
* Process the data from a form submission.
*
* @param array $data
* @return array of warnings
*/
public function process($data)
{
$warnings = array();
$fields = $this->definition();
// Avoiding execution timeouts when updating
// a large amount of grades.
$progress = 0;
$progressbar = new \core\progress\display_if_slow();
$progressbar->start_html();
$progressbar->start_progress(get_string('savegrades', 'gradereport_singleview'), count((array) $data) - 1);
$changecount = array();
foreach ($data as $varname => $throw) {
$progressbar->progress($progress);
$progress++;
if (preg_match("/(\\w+)_(\\d+)_(\\d+)/", $varname, $matches)) {
$itemid = $matches[2];
$userid = $matches[3];
} else {
continue;
}
$gradeitem = grade_item::fetch(array('id' => $itemid, 'courseid' => $this->courseid));
if (preg_match('/^old[oe]{1}/', $varname)) {
$elementname = preg_replace('/^old/', '', $varname);
if (!isset($data->{$elementname})) {
// Decrease the progress because we've increased the
// size of the array we are iterating through.
$progress--;
$data->{$elementname} = false;
}
}
if (!in_array($matches[1], $fields)) {
continue;
}
if (!$gradeitem) {
continue;
}
$grade = $this->fetch_grade_or_default($gradeitem, $userid);
$classname = '\\gradereport_singleview\\local\\ui\\' . $matches[1];
$element = new $classname($grade);
$name = $element->get_name();
$oldname = "old{$name}";
$posted = $data->{$name};
$format = $element->determine_format();
if ($format->is_textbox() and trim($data->{$name}) === '') {
$data->{$name} = null;
}
// Same value; skip.
if (isset($data->{$oldname}) && $data->{$oldname} == $posted) {
continue;
}
$msg = $element->set($posted);
// Optional type.
if (!empty($msg)) {
$warnings[] = $msg;
}
if (preg_match('/_(\\d+)_(\\d+)/', $varname, $matchelement)) {
$changecount[$matchelement[0]] = 1;
}
}
// Some post-processing.
$eventdata = new stdClass();
$eventdata->warnings = $warnings;
$eventdata->post_data = $data;
$eventdata->instance = $this;
$eventdata->changecount = $changecount;
$progressbar->end_html();
return $eventdata;
}
