1 files changed, 126 insertions, 0 deletions
diff --git a/lib/private/L10N/LanguageIterator.php b/lib/private/L10N/LanguageIterator.php
new file mode 100644
index 00000000000..531eea5866b
--- /dev/null
+++ b/lib/private/L10N/LanguageIterator.php
@@ -0,0 +1,126 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\L10N;
+
+use OCP\IConfig;
+use OCP\IUser;
+use OCP\L10N\ILanguageIterator;
+
+class LanguageIterator implements ILanguageIterator {
+	private $i = 0;
+	/** @var IConfig */
+	private $config;
+	/** @var IUser */
+	private $user;
+
+	public function __construct(IUser $user, IConfig $config) {
+		$this->config = $config;
+		$this->user = $user;
+	}
+
+	/**
+	 * Rewind the Iterator to the first element
+	 */
+	public function rewind(): void {
+		$this->i = 0;
+	}
+
+	/**
+	 * Return the current element
+	 *
+	 * @since 14.0.0
+	 */
+	public function current(): string {
+		switch ($this->i) {
+			/** @noinspection PhpMissingBreakStatementInspection */
+			case 0:
+				$forcedLang = $this->config->getSystemValue('force_language', false);
+				if (is_string($forcedLang)) {
+					return $forcedLang;
+				}
+				$this->next();
+				/** @noinspection PhpMissingBreakStatementInspection */
+				// no break
+			case 1:
+				$forcedLang = $this->config->getSystemValue('force_language', false);
+				if (is_string($forcedLang)
+					&& ($truncated = $this->getTruncatedLanguage($forcedLang)) !== $forcedLang
+				) {
+					return $truncated;
+				}
+				$this->next();
+				/** @noinspection PhpMissingBreakStatementInspection */
+				// no break
+			case 2:
+				$userLang = $this->config->getUserValue($this->user->getUID(), 'core', 'lang', null);
+				if (is_string($userLang)) {
+					return $userLang;
+				}
+				$this->next();
+				/** @noinspection PhpMissingBreakStatementInspection */
+				// no break
+			case 3:
+				$userLang = $this->config->getUserValue($this->user->getUID(), 'core', 'lang', null);
+				if (is_string($userLang)
+					&& ($truncated = $this->getTruncatedLanguage($userLang)) !== $userLang
+				) {
+					return $truncated;
+				}
+				$this->next();
+				// no break
+			case 4:
+				return $this->config->getSystemValueString('default_language', 'en');
+				/** @noinspection PhpMissingBreakStatementInspection */
+			case 5:
+				$defaultLang = $this->config->getSystemValueString('default_language', 'en');
+				if (($truncated = $this->getTruncatedLanguage($defaultLang)) !== $defaultLang) {
+					return $truncated;
+				}
+				$this->next();
+				// no break
+			default:
+				return 'en';
+		}
+	}
+
+	/**
+	 * Move forward to next element
+	 *
+	 * @since 14.0.0
+	 */
+	public function next(): void {
+		++$this->i;
+	}
+
+	/**
+	 * Return the key of the current element
+	 *
+	 * @since 14.0.0
+	 */
+	public function key(): int {
+		return $this->i;
+	}
+
+	/**
+	 * Checks if current position is valid
+	 *
+	 * @since 14.0.0
+	 */
+	public function valid(): bool {
+		return $this->i <= 6;
+	}
+
+	protected function getTruncatedLanguage(string $lang):string {
+		$pos = strpos($lang, '_');
+		if ($pos !== false) {
+			$lang = substr($lang, 0, $pos);
+		}
+		return $lang;
+	}
+}