/**
* Returns true if the server preference contains a partial language that matches the language in the client
* preference.
*
* e.g. An server variant of en-* would match en, en-US but not es-ES
*
* @param string $fromField
* @param MatchedPreferenceInterface $matchedPreference
* @param PreferenceInterface $newClientPref
*
* @return bool
*/
private function partialLangMatches($fromField, MatchedPreferenceInterface $matchedPreference, PreferenceInterface $newClientPref)
{
$serverPref = $matchedPreference->getServerPreference();
$oldClientPref = $matchedPreference->getClientPreference();
// Note that this only supports the simplest case of (e.g.) en-* matching en-GB and en-US, additional
// Language tags are explicitly ignored
list($clientMainLang) = explode('-', $newClientPref->getVariant());
list($serverMainLang) = explode('-', $serverPref->getVariant());
return PreferenceInterface::LANGUAGE === $fromField && PreferenceInterface::PARTIAL_WILDCARD === $serverPref->getPrecedence() && $clientMainLang == $serverMainLang && $newClientPref->getPrecedence() > $oldClientPref->getPrecedence();
}
/**
* Compare preferences alphabetically
*
* @param MatchedPreferenceInterface $lValue
* @param MatchedPreferenceInterface $rValue
*
* @return int -1, 0, 1 (see usort() callback for meaning)
*/
private function compareVariant(MatchedPreferenceInterface $lValue, MatchedPreferenceInterface $rValue)
{
return strcasecmp($lValue->getVariant(), $rValue->getVariant());
}
