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<?php
namespace ipl\I18n;
use ipl\Stdlib\Str;
use stdClass;
class Locale
{
/** @var string Default locale code */
protected $defaultLocale = 'en_US';
/**
* Get the default locale
*
* @return string
*/
public function getDefaultLocale()
{
return $this->defaultLocale;
}
/**
* Set the default locale
*
* @param string $defaultLocale
*
* @return $this
*/
public function setDefaultLocale($defaultLocale)
{
$this->defaultLocale = $defaultLocale;
return $this;
}
/**
* Return the preferred locale based on the given HTTP header and the available translations
*
* @param string $header The HTTP "Accept-Language" header
* @param array<string> $available Available translations
*
* @return string The browser's preferred locale code
*/
public function getPreferred($header, array $available)
{
$headerValues = Str::trimSplit($header, ',');
for ($i = 0; $i < count($headerValues); $i++) {
// In order to accomplish a stable sort we need to take the original
// index into account as well during element comparison
$headerValues[$i] = [$headerValues[$i], $i];
}
usort( // Sort DESC but keep equal elements ASC
$headerValues,
function ($a, $b) {
$tagA = Str::trimSplit($a[0], ';', 2);
$tagB = Str::trimSplit($b[0], ';', 2);
$qValA = (float) (strpos($a[0], ';') > 0 ? substr(array_pop($tagA), 2) : 1);
$qValB = (float) (strpos($b[0], ';') > 0 ? substr(array_pop($tagB), 2) : 1);
return $qValA < $qValB ? 1 : ($qValA > $qValB ? -1 : ($a[1] > $b[1] ? 1 : ($a[1] < $b[1] ? -1 : 0)));
}
);
for ($i = 0; $i < count($headerValues); $i++) {
// We need to reset the array to its original structure once it's sorted
$headerValues[$i] = $headerValues[$i][0];
}
$requestedLocales = [];
foreach ($headerValues as $headerValue) {
if (strpos($headerValue, ';') > 0) {
$parts = Str::trimSplit($headerValue, ';', 2);
$headerValue = $parts[0];
}
$requestedLocales[] = str_replace('-', '_', $headerValue);
}
$requestedLocales = array_combine(
array_map('strtolower', array_values($requestedLocales)),
array_values($requestedLocales)
);
$available[] = $this->defaultLocale;
$availableLocales = array_combine(
array_map('strtolower', array_values($available)),
array_values($available)
);
$similarMatch = null;
foreach ($requestedLocales as $requestedLocaleLowered => $requestedLocale) {
$localeObj = $this->parseLocale($requestedLocaleLowered);
if (
isset($availableLocales[$requestedLocaleLowered])
&& (! $similarMatch || $this->parseLocale($similarMatch)->language === $localeObj->language)
) {
// Prefer perfect match only if no similar match has been found yet or the perfect match is more precise
// than the similar match
return $availableLocales[$requestedLocaleLowered];
}
if (! $similarMatch) {
foreach ($availableLocales as $availableLocaleLowered => $availableLocale) {
if ($this->parseLocale($availableLocaleLowered)->language === $localeObj->language) {
$similarMatch = $availableLocaleLowered;
break;
}
}
}
}
return $similarMatch ? $availableLocales[$similarMatch] : $this->defaultLocale;
}
/**
* Parse a locale into its subtags
*
* Converts to output of {@link \Locale::parseLocale()} to an object and returns it.
*
* @param string $locale
*
* @return stdClass Output of {@link \Locale::parseLocale()} converted to an object
*/
public function parseLocale($locale)
{
return (object) \Locale::parseLocale($locale);
}
}
|
