/**
* This function actually evaluates the castext.
*/
private function instantiate()
{
if (!$this->valid) {
return false;
}
// Deal with castext without any CAS variables.
if (null !== $this->session) {
$this->session->instantiate();
$this->errors .= $this->session->get_errors();
}
$this->castext = stack_utils::wrap_around($this->trimmedcastext);
if (null !== $this->session) {
$this->castext = $this->session->get_display_castext($this->castext);
}
// Another modification. Stops <html> tags from being given $ tags.
$this->castext = str_replace('\\(<html>', '', $this->castext);
// Bug occurs when maxima returns <html>tags in output, eg plots or div by 0 errors.
$this->castext = str_replace('</html>\\)', '', $this->castext);
$this->latex_tidy();
$this->instantiated = true;
}
