113 lines
3.1 KiB
PHP
113 lines
3.1 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Intl;
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if (!class_exists(\Locale::class)) {
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throw new \LogicException(sprintf('You cannot use the "%s\Locale" class as the "intl" extension is not installed. See https://php.net/intl.', __NAMESPACE__));
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}
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/**
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* Provides access to locale-related data.
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*
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* @internal
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*/
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final class Locale extends \Locale
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{
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private static ?string $defaultFallback = 'en';
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/**
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* Sets the default fallback locale.
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*
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* The default fallback locale is used as fallback for locales that have no
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* fallback otherwise.
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*
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* @see getFallback()
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*/
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public static function setDefaultFallback(?string $locale): void
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{
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self::$defaultFallback = $locale;
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}
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/**
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* Returns the default fallback locale.
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*
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* @see setDefaultFallback()
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* @see getFallback()
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*/
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public static function getDefaultFallback(): ?string
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{
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return self::$defaultFallback;
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}
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/**
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* Returns the fallback locale for a given locale.
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*
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* For example, the fallback of "fr_FR" is "fr". The fallback of "fr" is
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* the default fallback locale configured with {@link setDefaultFallback()}.
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* The default fallback locale has no fallback.
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*
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* @return string|null The ICU locale code of the fallback locale, or null
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* if no fallback exists
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*/
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public static function getFallback(string $locale): ?string
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{
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if (\function_exists('locale_parse')) {
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$localeSubTags = locale_parse($locale) ?? ['language' => $locale];
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if (1 === \count($localeSubTags)) {
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if ('root' !== self::$defaultFallback && self::$defaultFallback === $localeSubTags['language']) {
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return 'root';
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}
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// Don't return default fallback for "root", "meta" or others
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// Normal locales have two or three letters
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if (\strlen($locale) < 4) {
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return self::$defaultFallback;
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}
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return null;
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}
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array_pop($localeSubTags);
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$fallback = locale_compose($localeSubTags);
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return false !== $fallback ? $fallback : null;
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}
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if (false !== $pos = strrpos($locale, '_')) {
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return substr($locale, 0, $pos);
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}
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if (false !== $pos = strrpos($locale, '-')) {
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return substr($locale, 0, $pos);
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}
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if ('root' !== self::$defaultFallback && self::$defaultFallback === $locale) {
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return 'root';
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}
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// Don't return default fallback for "root", "meta" or others
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// Normal locales have two or three letters
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return \strlen($locale) < 4 ? self::$defaultFallback : null;
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}
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/**
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* This class must not be instantiated.
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*/
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private function __construct()
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{
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}
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}
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