public function detect(DetectorConfig $config, RequestInterface $request)
{
$domains = $config->getDomains();
$host = $request->getUri()->getHost();
$matched = null;
if (null === $domains || empty($domains)) {
throw new Exception\InvalidArgumentException('No domains where configured');
}
foreach ($domains as $domain) {
if (strpos($domain, self::LOCALE_KEY) === false) {
throw new Exception\InvalidArgumentException(sprintf('The domain %s must contain a locale key part "%s"', $domain, self::LOCALE_KEY));
}
$pattern = str_replace(self::LOCALE_KEY, '([a-zA-Z-_.]+)', $domain);
$pattern = sprintf('@%s@', $pattern);
$result = preg_match($pattern, $host, $matches);
if ($result) {
$matched = $matches;
}
}
$locale = $matched[1];
$aliases = $config->getAliases();
if (null !== $aliases && array_key_exists($locale, $aliases)) {
$locale = $aliases[$locale];
}
return $locale;
}
