Twig.php

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<?php

namespace Gettext\Extractors;

use Gettext\Translations;
use Twig_Loader_String;
use Twig_Environment;

class Twig extends Extractor implements ExtractorInterface
{
    protected static $twig;

    public static function fromString($string, Translations $translations = null, $file = '')
    {
        self::addExtension('Twig_Extensions_Extension_I18n');

        $string = self::$twig->compileSource($string);

        // add default global php gettext functions
        PhpCode::$functions['gettext'] = '__';
        PhpCode::$functions['ngettext'] = '__';
        PhpCode::$functions['_'] = '__';

        return PhpCode::fromString($string, $translations, $file);
    }

    public static function addExtension($extension)
    {
        // initialise twig
        if (!isset(self::$twig)) {
            $twigCompiler = new Twig_Loader_String();

            self::$twig = new Twig_Environment($twigCompiler);
        }

        if (!self::checkHasExtensionByClassName($extension)) {
            self::$twig->addExtension(new $extension());
        }
    }

    protected static function checkHasExtensionByClassName($className)
    {
        foreach (self::$twig->getExtensions() as $extension) {
            if ($className == get_class($extension)) {
                return true;
            }
        }

        return false;
    }
}