public function input($filename, $input)
{
if (substr($filename, strlen($this->_settings['ext']) * -1) !== $this->_settings['ext']) {
return $input;
}
if (!class_exists('lessc')) {
throw new \Exception('Cannot not load "lessc" class. Make sure it is installed.');
}
$lc = new lessc($filename);
return $lc->parse();
}