function ajax_termdates()
{
OutputModes('ajax');
if (!CheckPermissions('public')) {
return;
}
$error = false;
$years = array();
if (isset($_GET['years'])) {
$year_ranges = split(',', $_GET['years']);
foreach ($year_ranges as $year_range) {
if ($year_range === '') {
continue;
}
$ends = split('-', $year_range);
if (count($ends) > 2) {
$this->main_frame->Error(array('class' => 'error', 'text' => 'Invalid year range: ' . $year_range));
$error = true;
} else {
if (count($ends) == 1) {
$ends = array($year_range, $year_range);
}
$range_error = false;
foreach ($ends as &$end) {
if (is_numeric($end) && $end >= 1970 && $end < 2037) {
$end = (int) $end;
} else {
$this->main_frame->Error(array('class' => 'error', 'text' => 'Invalid year: ' . $end));
$range_error = true;
}
}
if (!$range_error) {
for ($year = $ends[0]; $year <= $ends[1]; ++$year) {
$years[] = $year;
}
} else {
$error = true;
}
}
}
}
if (!$error) {
$root = array('_tag' => 'calendar', 'termdates' => array());
foreach ($years as $year) {
$acyear = array('_tag' => 'academicyear', '_attr' => array('year' => $year));
for ($term = 0; $term < 6; ++$term) {
$start_ts = Academic_time::StartOfAcademicTerm($year, $term);
$monday_ts = Academic_time::MondayWeek1OfAcademicTerm($year, $term);
$start = new Academic_time($start_ts);
$days = Academic_time::LengthOfAcademicTerm($year, $term);
$end = $start->Adjust($days . 'days');
$monday = new Academic_time($monday_ts);
$acterm = array('_tag' => 'term', '_attr' => array('id' => "term_{$year}_{$term}", 'term' => $term), 'type' => $start->AcademicTermTypeName(), 'name' => $start->AcademicTermName(), 'unique' => $start->AcademicTermNameUnique(), 'start' => $start->Format('Y-m-d'), 'end' => $end->Format('Y-m-d'), 'days' => $days, 'mondayweek1' => $monday->Format('Y-m-d'), 'weeks' => $start->AcademicTermWeeks());
$acyear[] = $acterm;
}
$root['termdates'][] = $acyear;
}
$this->main_frame->SetXml($root);
}
$this->main_frame->Load();
}