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plugins/simplesaml/lib/vendor/symfony/intl/Locale.php

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