PHPMD\RuleSetFactory::createRuleSetFileName PHP Method

    private function createRuleSetFileName($ruleSetOrFileName)
    {
        if (file_exists($ruleSetOrFileName) === true) {
            return $ruleSetOrFileName;
        }
        $fileName = $this->location . '/' . $ruleSetOrFileName;
        if (file_exists($fileName) === true) {
            return $fileName;
        }
        $fileName = $this->location . '/rulesets/' . $ruleSetOrFileName . '.xml';
        if (file_exists($fileName) === true) {
            return $fileName;
        }
        $fileName = getcwd() . '/rulesets/' . $ruleSetOrFileName . '.xml';
        if (file_exists($fileName) === true) {
            return $fileName;
        }
        foreach (explode(PATH_SEPARATOR, get_include_path()) as $includePath) {
            $fileName = $includePath . '/' . $ruleSetOrFileName;
            if (file_exists($fileName) === true) {
                return $fileName;
            }
            $fileName = $includePath . '/' . $ruleSetOrFileName . ".xml";
            if (file_exists($fileName) === true) {
                return $fileName;
            }
        }
        throw new RuleSetNotFoundException($ruleSetOrFileName);
    }