Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file src/Core/L10n.php
*/
namespace Friendica\Core;
use Friendica\BaseObject;
use Friendica\Database\DBA;
/**
* Provide Language, Translation, and Localization functions to the application
* Localization can be referred to by the numeronym L10N (as in: "L", followed by ten more letters, and then "N").
*/
class L10n extends BaseObject
{
/**
* A string indicating the current language used for translation:
* - Two-letter ISO 639-1 code.
* - Two-letter ISO 639-1 code + dash + Two-letter ISO 3166-1 alpha-2 country code.
* @var string
*/
private static $lang = '';
/**
* A language code saved for later after pushLang() has been called.
*
* @var string
*/
private static $langSave = '';
/**
* An array of translation strings whose key is the neutral english message.
*
* @var array
*/
private static $strings = [];
/**
* An array of translation strings saved for later after pushLang() has been called.
*
* @var array
*/
private static $stringsSave = [];
/**
* Detects the language and sets the translation table
*/
public static function init()
{
$lang = self::detectLanguage();
self::loadTranslationTable($lang);
}
/**
* Returns the current language code
*
* @return string Language code
*/
public static function getCurrentLang()
{
return self::$lang;
}
/**
* Sets the language session variable
*/
public static function setSessionVariable()
{
if (!empty($_SESSION['authenticated']) && empty($_SESSION['language'])) {
$_SESSION['language'] = self::$lang;
// we haven't loaded user data yet, but we need user language
if (!empty($_SESSION['uid'])) {
$user = DBA::selectFirst('user', ['language'], ['uid' => $_SESSION['uid']]);
if (DBA::isResult($user)) {
$_SESSION['language'] = $user['language'];
}
}
}
}
public static function setLangFromSession()
{
if (!empty($_SESSION['language']) && $_SESSION['language'] !== self::$lang) {
self::loadTranslationTable($_SESSION['language']);
}
}
/**
* @brief Returns the preferred language from the HTTP_ACCEPT_LANGUAGE header
* @return string The two-letter language code
*/
public static function detectLanguage()
{
$lang_list = [];
if (!empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
// break up string into pieces (languages and q factors)
preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse);
if (count($lang_parse[1])) {
// go through the list of prefered languages and add a generic language
// for sub-linguas (e.g. de-ch will add de) if not already in array
for ($i = 0; $i < count($lang_parse[1]); $i++) {
$lang_list[] = strtolower($lang_parse[1][$i]);
if (strlen($lang_parse[1][$i])>3) {
$dashpos = strpos($lang_parse[1][$i], '-');
if (!in_array(substr($lang_parse[1][$i], 0, $dashpos), $lang_list)) {
$lang_list[] = strtolower(substr($lang_parse[1][$i], 0, $dashpos));
}
}
}
}
}
//if $_GET['lang'] is set force $_GET['lang']
if (isset($_GET['lang'])) {
$lang_list = [$_GET['lang']];
}
// check if we have translations for the preferred languages and pick the 1st that has
foreach ($lang_list as $lang) {
if ($lang === 'en' || (file_exists("view/lang/$lang") && is_dir("view/lang/$lang"))) {
$preferred = $lang;
break;
}
}
if (isset($preferred)) {
return $preferred;
}
// in case none matches, get the system wide configured language, or fall back to English
return Config::get('system', 'language', 'en');
}
/**
* This function should be called before formatting messages in a specific target language
* different from the current user/system language.
*
* It saves the current translation strings in a separate variable and loads new translations strings.
*
* If called repeatedly, it won't save the translation strings again, just load the new ones.
*
* @see popLang()
* @brief Stores the current language strings and load a different language.
* @param string $lang Language code
*/
public static function pushLang($lang)
{
if (!self::$lang) {
self::init();
}
if ($lang === self::$lang) {
return;
}
if (!self::$langSave) {
self::$langSave = self::$lang;
self::$stringsSave = self::$strings;
}
self::loadTranslationTable($lang);
}
/**
* Restores the original user/system language after having used pushLang()
*/
public static function popLang()
{
if (!self::$langSave) {
return;
}
self::$strings = self::$stringsSave;
self::$lang = self::$langSave;
self::$stringsSave = [];
self::$langSave = '';
}
/**
* Loads string translation table
*
* First addon strings are loaded, then globals
*
* Uses an App object shim since all the strings files refer to $a->strings
*
* @param string $lang language code to load
*/
private static function loadTranslationTable($lang)
{
if ($lang === self::$lang) {
return;
}
$a = new \stdClass();
$a->strings = [];
// load enabled addons strings
$addons = DBA::select('addon', ['name'], ['installed' => true]);
while ($p = DBA::fetch($addons)) {
$name = $p['name'];
if (file_exists("addon/$name/lang/$lang/strings.php")) {
include "addon/$name/lang/$lang/strings.php";
}
}
if (file_exists("view/lang/$lang/strings.php")) {
include "view/lang/$lang/strings.php";
}
self::$lang = $lang;
self::$strings = $a->strings;
unset($a);
}
/**
* @brief Return the localized version of the provided string with optional string interpolation
*
* This function takes a english string as parameter, and if a localized version
* exists for the current language, substitutes it before performing an eventual
* string interpolation (sprintf) with additional optional arguments.
*
* Usages:
* - L10n::t('This is an example')
* - L10n::t('URL %s returned no result', $url)
* - L10n::t('Current version: %s, new version: %s', $current_version, $new_version)
*
* @param string $s
* @param array $vars Variables to interpolate in the translation string
* @return string
*/
public static function t($s, ...$vars)
{
if (empty($s)) {
return '';
}
if (!self::$lang) {
self::init();
}
if (!empty(self::$strings[$s])) {
$t = self::$strings[$s];
$s = is_array($t) ? $t[0] : $t;
}
if (count($vars) > 0) {
$s = sprintf($s, ...$vars);
}
return $s;
}
/**
* @brief Return the localized version of a singular/plural string with optional string interpolation
*
* This function takes two english strings as parameters, singular and plural, as
* well as a count. If a localized version exists for the current language, they
* are used instead. Discrimination between singular and plural is done using the
* localized function if any or the default one. Finally, a string interpolation
* is performed using the count as parameter.
*
* Usages:
* - L10n::tt('Like', 'Likes', $count)
* - L10n::tt("%s user deleted", "%s users deleted", count($users))
*
* @param string $singular
* @param string $plural
* @param int $count
* @return string
*/
public static function tt($singular, $plural, $count)
{
if (!is_numeric($count)) {
Logger::log('Non numeric count called by ' . System::callstack(20));
}
if (!self::$lang) {
self::init();
}
if (!empty(self::$strings[$singular])) {
$t = self::$strings[$singular];
if (is_array($t)) {
$plural_function = 'string_plural_select_' . str_replace('-', '_', self::$lang);
if (function_exists($plural_function)) {
$i = $plural_function($count);
} else {
$i = self::stringPluralSelectDefault($count);
}
// for some languages there is only a single array item
if (!isset($t[$i])) {
$s = $t[0];
} else {
$s = $t[$i];
}
} else {
$s = $t;
}
} elseif (self::stringPluralSelectDefault($count)) {
$s = $plural;
} else {
$s = $singular;
}
$s = @sprintf($s, $count);
return $s;
}
/**
* Provide a fallback which will not collide with a function defined in any language file
*/
private static function stringPluralSelectDefault($n)
{
return $n != 1;
}
/**
* @brief Return installed languages codes as associative array
*
* Scans the view/lang directory for the existence of "strings.php" files, and
* returns an alphabetical list of their folder names (@-char language codes).
* Adds the english language if it's missing from the list.
*
* Ex: array('de' => 'de', 'en' => 'en', 'fr' => 'fr', ...)
*
* @return array
*/
public static function getAvailableLanguages()
{
$langs = [];
$strings_file_paths = glob('view/lang/*/strings.php');
if (is_array($strings_file_paths) && count($strings_file_paths)) {
if (!in_array('view/lang/en/strings.php', $strings_file_paths)) {
$strings_file_paths[] = 'view/lang/en/strings.php';
}
asort($strings_file_paths);
foreach ($strings_file_paths as $strings_file_path) {
$path_array = explode('/', $strings_file_path);
$langs[$path_array[2]] = $path_array[2];
}
}
return $langs;
}
/**
* @brief Translate days and months names.
*
* @param string $s String with day or month name.
* @return string Translated string.
*/
public static function getDay($s)
{
$ret = str_replace(['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'],
[self::t('Monday'), self::t('Tuesday'), self::t('Wednesday'), self::t('Thursday'), self::t('Friday'), self::t('Saturday'), self::t('Sunday')],
$s);
$ret = str_replace(['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
[self::t('January'), self::t('February'), self::t('March'), self::t('April'), self::t('May'), self::t('June'), self::t('July'), self::t('August'), self::t('September'), self::t('October'), self::t('November'), self::t('December')],
$ret);
return $ret;
}
/**
* @brief Translate short days and months names.
*
* @param string $s String with short day or month name.
* @return string Translated string.
*/
public static function getDayShort($s)
{
$ret = str_replace(['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
[self::t('Mon'), self::t('Tue'), self::t('Wed'), self::t('Thu'), self::t('Fri'), self::t('Sat'), self::t('Sun')],
$s);
$ret = str_replace(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
[self::t('Jan'), self::t('Feb'), self::t('Mar'), self::t('Apr'), self::t('May'), ('Jun'), self::t('Jul'), self::t('Aug'), self::t('Sep'), self::t('Oct'), self::t('Nov'), self::t('Dec')],
$ret);
return $ret;
}
/**
* Load poke verbs
*
* @return array index is present tense verb
* value is array containing past tense verb, translation of present, translation of past
* @hook poke_verbs pokes array
*/
public static function getPokeVerbs()
{
// index is present tense verb
// value is array containing past tense verb, translation of present, translation of past
$arr = [
'poke' => ['poked', self::t('poke'), self::t('poked')],
'ping' => ['pinged', self::t('ping'), self::t('pinged')],
'prod' => ['prodded', self::t('prod'), self::t('prodded')],
'slap' => ['slapped', self::t('slap'), self::t('slapped')],
'finger' => ['fingered', self::t('finger'), self::t('fingered')],
'rebuff' => ['rebuffed', self::t('rebuff'), self::t('rebuffed')],
];
Hook::callAll('poke_verbs', $arr);
return $arr;
}
}