Are you a developer? so you are lucky because Simple theme come with syntax highlighting powered by Highlight js with support for over 100 languages. See a example code in PHP:
use Yosymfony\Spress\Core\Application;
class MyClass
{
public function parseSite()
{
$options = [];
$app = new Application($options);
$app->parse('/path-to-my-spress-site/');
}
}