/**
* OpeС‚s and creates XML DOM tree.
*
* Sets error for YMLParser if cannot open file or xml is invalid
*
* @param string $filename Path to file
*
* @throws \Exception Throws exception if file doesn't exist or its size = 0
*
* @return bool
*/
public function open($filename)
{
if (file_exists($filename) === false || filesize($filename) === 0) {
throw new \Exception("File: {$filename} does not exist or empty.");
}
return $this->driver->open($filename);
}
