public function get_errors($casdebug = false)
{
if (null === $this->valid) {
$this->validate();
}
if ($casdebug) {
return $this->errors . $this->session->get_debuginfo();
}
return $this->errors;
}
/**
*
*
* @return bool
* @access public
*/
public function do_test()
{
if ('' == trim($this->sanskey)) {
$this->aterror = stack_string('TEST_FAILED', array('errors' => stack_string("AT_EmptySA")));
$this->atfeedback = stack_string('TEST_FAILED', array('errors' => stack_string("AT_EmptySA")));
$this->atansnote = $this->casfunction . 'TEST_FAILED:Empty SA.';
$this->atmark = 0;
$this->atvalid = false;
return null;
}
if ('' == trim($this->tanskey)) {
$this->aterror = stack_string('TEST_FAILED', array('errors' => stack_string("AT_EmptyTA")));
$this->atfeedback = stack_string('TEST_FAILED', array('errors' => stack_string("AT_EmptyTA")));
$this->atansnote = $this->casfunction . 'TEST_FAILED:Empty TA.';
$this->atmark = 0;
$this->atvalid = false;
return null;
}
if ($this->processcasoptions) {
if (null == $this->atoption or '' == $this->atoption) {
$this->aterror = 'TEST_FAILED';
$this->atfeedback = stack_string('TEST_FAILED', array('errors' => stack_string("AT_MissingOptions")));
$this->atansnote = 'STACKERROR_OPTION.';
$this->atmark = 0;
$this->atvalid = false;
return null;
} else {
// Validate with teacher privileges, strict syntax & no automatically adding stars.
$ct = new stack_cas_casstring($this->atoption);
if (!$ct->get_valid('t', true, 1)) {
$this->aterror = 'TEST_FAILED';
$this->atfeedback = stack_string('TEST_FAILED', array('errors' => ''));
$this->atfeedback .= stack_string('AT_InvalidOptions', array('errors' => $ct->get_errors()));
$this->atansnote = 'STACKERROR_OPTION.';
$this->atmark = 0;
$this->atvalid = false;
return null;
}
}
$atopt = $this->atoption;
$ta = "[{$this->tanskey},{$atopt}]";
} else {
$ta = $this->tanskey;
}
// Sort out options.
if (null === $this->options) {
$this->options = new stack_options();
}
if (!(null === $this->simp)) {
$this->options->set_option('simplify', $this->simp);
}
$cascommands = array();
$cascommands[] = "STACKSA:{$this->sanskey}";
$cascommands[] = "STACKTA:{$ta}";
$cascommands[] = "result:StackReturn({$this->casfunction}(STACKSA,STACKTA))";
$cts = array();
foreach ($cascommands as $com) {
$cs = new stack_cas_casstring($com);
$cs->get_valid('t', true, 0);
$cts[] = $cs;
}
$session = new stack_cas_session($cts, $this->options, 0);
$session->instantiate();
$this->debuginfo = $session->get_debuginfo();
if ('' != $session->get_errors_key('STACKSA')) {
$this->aterror = 'TEST_FAILED';
$this->atfeedback = stack_string('TEST_FAILED', array('errors' => $session->get_errors_key('STACKSA')));
$this->atansnote = $this->casfunction . '_STACKERROR_SAns.';
$this->atmark = 0;
$this->atvalid = false;
return null;
}
if ('' != $session->get_errors_key('STACKTA')) {
$this->aterror = 'TEST_FAILED';
$this->atfeedback = stack_string('TEST_FAILED', array('errors' => $session->get_errors_key('STACKTA')));
$this->atansnote = $this->casfunction . '_STACKERROR_TAns.';
$this->atmark = 0;
$this->atvalid = false;
return null;
}
$sessionvars = $session->get_session();
$result = $sessionvars[2];
if ('' != $result->get_errors()) {
$this->aterror = 'TEST_FAILED';
if ('' != trim($result->get_feedback())) {
$this->atfeedback = $result->get_feedback();
} else {
$this->atfeedback = stack_string('TEST_FAILED', array('errors' => $result->get_errors()));
}
$this->atansnote = trim($result->get_answernote());
$this->atmark = 0;
$this->atvalid = false;
return null;
}
$this->atansnote = trim($result->get_answernote());
// Convert the Maxima string 'true' to PHP true.
if ('true' == $result->get_value()) {
$this->atmark = 1;
} else {
$this->atmark = 0;
}
$this->atfeedback = $result->get_feedback();
$this->atvalid = $result->get_valid();
if ($this->atmark) {
return true;
} else {
return false;
}
}
