96 lines
2.8 KiB
PHP
96 lines
2.8 KiB
PHP
<?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\Translation;
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use Symfony\Component\Translation\Exception\InvalidArgumentException;
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/**
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* Derives fallback locales based on ICU parent locale information, by shortening locale
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* sub tags and ultimately by going through a list of configured fallback locales.
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*
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* Also provides locale string validation.
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*
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* @author Matthias Pigulla <mp@webfactory.de>
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*/
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final class LocaleFallbackProvider
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{
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/**
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* @param string[] $localeFallbacks List of fallback locales to add _after_ the ones derived from ICU information
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*
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* @throws InvalidArgumentException If a locale contains invalid characters
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*/
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public function __construct(
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private array $localeFallbacks = [],
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) {
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foreach ($localeFallbacks as $locale) {
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self::validateLocale($locale);
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}
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}
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/**
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* @return string[]
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*/
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public function computeFallbackLocales(string $locale): array
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{
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self::validateLocale($locale);
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static $parentLocales;
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$parentLocales ??= require __DIR__.'/Resources/data/parents.php';
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$originLocale = $locale;
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$locales = [];
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while ($locale) {
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if ($parent = $parentLocales[$locale] ?? null) {
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$locale = 'root' !== $parent ? $parent : null;
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} elseif (\function_exists('locale_parse')) {
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$localeSubTags = locale_parse($locale);
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$locale = null;
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if (1 < \count($localeSubTags)) {
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array_pop($localeSubTags);
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$locale = locale_compose($localeSubTags) ?: null;
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}
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} elseif ($i = strrpos($locale, '_') ?: strrpos($locale, '-')) {
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$locale = substr($locale, 0, $i);
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} else {
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$locale = null;
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}
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if (null !== $locale) {
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$locales[$locale] = $locale;
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}
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}
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foreach ($this->localeFallbacks as $fallback) {
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if ($fallback === $originLocale) {
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continue;
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}
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$locales[$fallback] = $fallback;
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}
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return array_keys($locales);
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}
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/**
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* Asserts that the locale is valid, throws an Exception if not.
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*
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* @throws InvalidArgumentException If the locale contains invalid characters
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*/
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public static function validateLocale(string $locale): void
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{
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if (!preg_match('/^[a-z0-9@_\.\-]*$/i', $locale)) {
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throw new InvalidArgumentException(\sprintf('Invalid "%s" locale.', $locale));
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}
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}
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}
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