ApiGen\Configuration\ConfigurationOptionsResolver::allowedValuesForSource PHP Метод

    private function allowedValuesForSource($source)
    {
        if (!$source) {
            throw new ConfigurationException("Source is not set. Use '-s <dir>' or config to set it");
        } elseif (!is_array($source)) {
            $source = [$source];
        }
        foreach ($source as $singleSource) {
            if (!file_exists($singleSource)) {
                throw new ConfigurationException("Source '{$singleSource}' does not exist");
            }
        }
        return true;
    }