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<?php
namespace Shaarli;
use Gettext\GettextTranslator;
use Gettext\Merge;
use Gettext\Translations;
use Gettext\Translator;
use Gettext\TranslatorInterface;
use Shaarli\Config\ConfigManager;
/**
* Class Languages
*
* Load Shaarli translations using 'gettext/gettext'.
* This class allows to either use PHP gettext extension, or a PHP implementation of gettext,
* with a fixed language, or dynamically using autoLocale().
*
* Translation files PO/MO files follow gettext standard and must be placed under:
* <translation path>/<language>/LC_MESSAGES/<domain>.[po|mo]
*
* Pros/cons:
* - gettext extension is faster
* - gettext is very system dependent (PHP extension, the locale must be installed, and web server reloaded)
*
* Settings:
* - translation.mode:
* - auto: use default setting (PHP implementation)
* - php: use PHP implementation
* - gettext: use gettext wrapper
* - translation.language:
* - auto: use autoLocale() and the language change according to user HTTP headers
* - fixed language: e.g. 'fr'
* - translation.extensions:
* - domain => translation_path: allow plugins and themes to extend the defaut extension
* The domain must be unique, and translation path must be relative, and contains the tree mentioned above.
*
* @package Shaarli
*/
class Languages
{
/**
* Core translations domain
*/
const DEFAULT_DOMAIN = 'shaarli';
/**
* @var TranslatorInterface
*/
protected $translator;
/**
* @var string
*/
protected $language;
/**
* @var ConfigManager
*/
protected $conf;
/**
* Languages constructor.
*
* @param string $language lang determined by autoLocale(), can be overridden.
* @param ConfigManager $conf instance.
*/
public function __construct($language, $conf)
{
$this->conf = $conf;
$confLanguage = $this->conf->get('translation.language', 'auto');
// Auto mode or invalid parameter, use the detected language.
// If the detected language is invalid, it doesn't matter, it will use English.
if ($confLanguage === 'auto' || ! $this->isValidLanguage($confLanguage)) {
$this->language = substr($language, 0, 5);
} else {
$this->language = $confLanguage;
}
if (! extension_loaded('gettext')
|| in_array($this->conf->get('translation.mode', 'auto'), ['auto', 'php'])
) {
$this->initPhpTranslator();
} else {
$this->initGettextTranslator();
}
// Register default functions (e.g. '__()') to use our Translator
$this->translator->register();
}
/**
* Initialize the translator using php gettext extension (gettext dependency act as a wrapper).
*/
protected function initGettextTranslator()
{
$this->translator = new GettextTranslator();
$this->translator->setLanguage($this->language);
$this->translator->loadDomain(self::DEFAULT_DOMAIN, 'inc/languages');
// Default extension translation from the current theme
$themeTransFolder = rtrim($this->conf->get('raintpl_tpl'), '/') .'/'. $this->conf->get('theme') .'/language';
if (is_dir($themeTransFolder)) {
$this->translator->loadDomain($this->conf->get('theme'), $themeTransFolder, false);
}
foreach ($this->conf->get('translation.extensions', []) as $domain => $translationPath) {
if ($domain !== self::DEFAULT_DOMAIN) {
$this->translator->loadDomain($domain, $translationPath, false);
}
}
}
/**
* Initialize the translator using a PHP implementation of gettext.
*
* Note that if language po file doesn't exist, errors are ignored (e.g. not installed language).
*/
protected function initPhpTranslator()
{
$this->translator = new Translator();
$translations = new Translations();
// Core translations
try {
$translations = $translations->addFromPoFile('inc/languages/'. $this->language .'/LC_MESSAGES/shaarli.po');
$translations->setDomain('shaarli');
$this->translator->loadTranslations($translations);
} catch (\InvalidArgumentException $e) {
}
// Default extension translation from the current theme
$theme = $this->conf->get('theme');
$themeTransFolder = rtrim($this->conf->get('raintpl_tpl'), '/') .'/'. $theme .'/language';
if (is_dir($themeTransFolder)) {
try {
$translations = Translations::fromPoFile(
$themeTransFolder .'/'. $this->language .'/LC_MESSAGES/'. $theme .'.po'
);
$translations->setDomain($theme);
$this->translator->loadTranslations($translations);
} catch (\InvalidArgumentException $e) {
}
}
// Extension translations (plugins, themes, etc.).
foreach ($this->conf->get('translation.extensions', []) as $domain => $translationPath) {
if ($domain === self::DEFAULT_DOMAIN) {
continue;
}
try {
$extension = Translations::fromPoFile($translationPath . $this->language .'/LC_MESSAGES/'. $domain .'.po');
$extension->setDomain($domain);
$this->translator->loadTranslations($extension);
} catch (\InvalidArgumentException $e) {
}
}
}
/**
* Checks if a language string is valid.
*
* @param string $language e.g. 'fr' or 'en_US'
*
* @return bool true if valid, false otherwise
*/
protected function isValidLanguage($language)
{
return preg_match('/^[a-z]{2}(_[A-Z]{2})?/', $language) === 1;
}
/**
* Get the list of available languages for Shaarli.
*
* @return array List of available languages, with their label.
*/
public static function getAvailableLanguages()
{
return [
'auto' => t('Automatic'),
'en' => t('English'),
'fr' => t('French'),
'de' => t('German'),
];
}
}
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