383 lines
11 KiB
PHP
383 lines
11 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.22
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*/
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namespace PrivateBin;
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/**
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* I18n
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*
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* provides internationalization tools like translation, browser language detection, etc.
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*/
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class I18n
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{
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/**
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* language
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*
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* @access protected
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* @static
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* @var string
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*/
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protected static $_language = 'en';
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/**
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* language fallback
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*
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* @access protected
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* @static
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* @var string
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*/
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protected static $_languageFallback = 'en';
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/**
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* language labels
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*
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* @access protected
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* @static
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* @var array
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*/
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protected static $_languageLabels = array();
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/**
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* available languages
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*
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* @access protected
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* @static
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* @var array
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*/
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protected static $_availableLanguages = array();
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/**
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* path to language files
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*
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* @access protected
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* @static
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* @var string
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*/
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protected static $_path = '';
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/**
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* translation cache
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*
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* @access protected
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* @static
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* @var array
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*/
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protected static $_translations = array();
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/**
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* translate a string, alias for translate()
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*
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* @access public
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* @static
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* @param string $messageId
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* @param mixed $args one or multiple parameters injected into placeholders
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* @return string
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*/
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public static function _($messageId)
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{
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return forward_static_call_array('self::translate', func_get_args());
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}
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/**
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* translate a string
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*
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* @access public
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* @static
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* @param string $messageId
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* @param mixed $args one or multiple parameters injected into placeholders
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* @return string
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*/
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public static function translate($messageId)
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{
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if (empty($messageId)) {
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return $messageId;
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}
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if (count(self::$_translations) === 0) {
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self::loadTranslations();
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}
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$messages = $messageId;
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if (is_array($messageId)) {
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$messageId = count($messageId) > 1 ? $messageId[1] : $messageId[0];
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}
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if (!array_key_exists($messageId, self::$_translations)) {
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self::$_translations[$messageId] = $messages;
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}
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$args = func_get_args();
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if (is_array(self::$_translations[$messageId])) {
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$number = (int) $args[1];
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$key = self::_getPluralForm($number);
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$max = count(self::$_translations[$messageId]) - 1;
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if ($key > $max) {
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$key = $max;
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}
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$args[0] = self::$_translations[$messageId][$key];
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$args[1] = $number;
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} else {
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$args[0] = self::$_translations[$messageId];
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}
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return call_user_func_array('sprintf', $args);
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}
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/**
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* loads translations
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*
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* From: https://stackoverflow.com/questions/3770513/detect-browser-language-in-php#3771447
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*
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* @access public
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* @static
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* @return void
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*/
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public static function loadTranslations()
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{
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$availableLanguages = self::getAvailableLanguages();
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// check if the lang cookie was set and that language exists
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if (array_key_exists('lang', $_COOKIE) && in_array($_COOKIE['lang'], $availableLanguages)) {
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$match = $_COOKIE['lang'];
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}
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// find a translation file matching the browsers language preferences
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else {
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$match = self::_getMatchingLanguage(
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self::getBrowserLanguages(), $availableLanguages
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);
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}
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// load translations
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self::$_language = $match;
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self::$_translations = ($match == 'en') ? array() : json_decode(
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file_get_contents(self::_getPath($match . '.json')),
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true
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);
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}
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/**
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* get list of available translations based on files found
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*
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* @access public
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* @static
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* @return array
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*/
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public static function getAvailableLanguages()
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{
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if (count(self::$_availableLanguages) == 0) {
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$i18n = dir(self::_getPath());
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while (false !== ($file = $i18n->read())) {
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if (preg_match('/^([a-z]{2}).json$/', $file, $match) === 1) {
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self::$_availableLanguages[] = $match[1];
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}
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}
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self::$_availableLanguages[] = 'en';
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}
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return self::$_availableLanguages;
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}
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/**
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* detect the clients supported languages and return them ordered by preference
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*
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* From: https://stackoverflow.com/questions/3770513/detect-browser-language-in-php#3771447
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*
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* @access public
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* @static
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* @return array
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*/
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public static function getBrowserLanguages()
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{
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$languages = array();
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if (array_key_exists('HTTP_ACCEPT_LANGUAGE', $_SERVER)) {
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$languageRanges = explode(',', trim($_SERVER['HTTP_ACCEPT_LANGUAGE']));
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foreach ($languageRanges as $languageRange) {
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if (preg_match(
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'/(\*|[a-zA-Z0-9]{1,8}(?:-[a-zA-Z0-9]{1,8})*)(?:\s*;\s*q\s*=\s*(0(?:\.\d{0,3})|1(?:\.0{0,3})))?/',
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trim($languageRange), $match
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)) {
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if (!isset($match[2])) {
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$match[2] = '1.0';
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} else {
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$match[2] = (string) floatval($match[2]);
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}
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if (!isset($languages[$match[2]])) {
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$languages[$match[2]] = array();
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}
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$languages[$match[2]][] = strtolower($match[1]);
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}
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}
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krsort($languages);
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}
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return $languages;
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}
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/**
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* get currently loaded language
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*
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* @access public
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* @static
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* @return string
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*/
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public static function getLanguage()
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{
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return self::$_language;
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}
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/**
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* get list of language labels
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*
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* Only for given language codes, otherwise all labels.
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*
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* @access public
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* @static
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* @param array $languages
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* @return array
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*/
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public static function getLanguageLabels($languages = array())
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{
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$file = self::_getPath('languages.json');
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if (count(self::$_languageLabels) == 0 && is_readable($file)) {
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self::$_languageLabels = json_decode(file_get_contents($file), true);
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}
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if (count($languages) == 0) {
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return self::$_languageLabels;
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}
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return array_intersect_key(self::$_languageLabels, array_flip($languages));
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}
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/**
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* set the default language
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*
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* @access public
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* @static
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* @param string $lang
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* @return void
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*/
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public static function setLanguageFallback($lang)
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{
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if (in_array($lang, self::getAvailableLanguages())) {
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self::$_languageFallback = $lang;
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}
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}
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/**
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* get language file path
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*
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* @access protected
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* @static
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* @param string $file
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* @return string
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*/
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protected static function _getPath($file = '')
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{
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if (strlen(self::$_path) == 0) {
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self::$_path = PUBLIC_PATH . DIRECTORY_SEPARATOR . 'i18n';
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}
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return self::$_path . (strlen($file) ? DIRECTORY_SEPARATOR . $file : '');
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}
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/**
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* determines the plural form to use based on current language and given number
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*
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* From: http://localization-guide.readthedocs.org/en/latest/l10n/pluralforms.html
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*
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* @access protected
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* @static
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* @param int $n
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* @return int
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*/
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protected static function _getPluralForm($n)
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{
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switch (self::$_language) {
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case 'fr':
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case 'zh':
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return ($n > 1 ? 1 : 0);
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case 'pl':
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return ($n == 1 ? 0 : $n % 10 >= 2 && $n % 10 <= 4 && ($n % 100 < 10 || $n % 100 >= 20) ? 1 : 2);
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// en, de
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default:
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return ($n != 1 ? 1 : 0);
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}
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}
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/**
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* compares two language preference arrays and returns the preferred match
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*
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* From: https://stackoverflow.com/questions/3770513/detect-browser-language-in-php#3771447
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*
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* @access protected
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* @static
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* @param array $acceptedLanguages
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* @param array $availableLanguages
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* @return string
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*/
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protected static function _getMatchingLanguage($acceptedLanguages, $availableLanguages)
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{
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$matches = array();
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$any = false;
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foreach ($acceptedLanguages as $acceptedQuality => $acceptedValues) {
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$acceptedQuality = floatval($acceptedQuality);
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if ($acceptedQuality === 0.0) {
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continue;
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}
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foreach ($availableLanguages as $availableValue) {
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$availableQuality = 1.0;
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foreach ($acceptedValues as $acceptedValue) {
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if ($acceptedValue === '*') {
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$any = true;
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}
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$matchingGrade = self::_matchLanguage($acceptedValue, $availableValue);
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if ($matchingGrade > 0) {
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$q = (string) ($acceptedQuality * $availableQuality * $matchingGrade);
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if (!isset($matches[$q])) {
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$matches[$q] = array();
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}
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if (!in_array($availableValue, $matches[$q])) {
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$matches[$q][] = $availableValue;
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}
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}
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}
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}
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}
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if (count($matches) === 0 && $any) {
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if (count($availableLanguages) > 0) {
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$matches['1.0'] = $availableLanguages;
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}
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}
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if (count($matches) === 0) {
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return self::$_languageFallback;
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}
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krsort($matches);
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$topmatches = current($matches);
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return current($topmatches);
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}
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/**
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* compare two language IDs and return the degree they match
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*
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* From: https://stackoverflow.com/questions/3770513/detect-browser-language-in-php#3771447
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*
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* @access protected
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* @static
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* @param string $a
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* @param string $b
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* @return float
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*/
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protected static function _matchLanguage($a, $b)
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{
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$a = explode('-', $a);
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$b = explode('-', $b);
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for ($i = 0, $n = min(count($a), count($b)); $i < $n; ++$i) {
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if ($a[$i] !== $b[$i]) {
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break;
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}
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}
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return $i === 0 ? 0 : (float) $i / count($a);
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}
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}
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