LcShopBundle/ShopBundle/Twig/BackendTwigExtension.php

<?php

namespace Lc\ShopBundle\Twig;

use Symfony\Contracts\Translation\TranslatorInterface;
use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;
use Twig\TwigFunction;

class BackendTwigExtension extends AbstractExtension
{
        public $trans;

        public function __construct(TranslatorInterface $translator)
        {
                $this->trans = $translator;

        }


        public function getFunctions()
        {
                return array(

                );
        }
        public function getFilters()
        {
                return [
                        new TwigFilter('lc_trad', [$this, 'lcTrad'])
                ];
        }

        public function lcTrad($field, $entityName, $type="field")
        {

                $tradKey = $type.'.'.$entityName.'.'.$field;
                $tradDefaultKey = $type.'.default.'.$field;
                $trad = $this->trans->trans($tradKey, array(), 'lcshop');
                if($trad == $tradKey){
                        $trad = $this->trans->trans($tradDefaultKey, array(), 'lcshop');
                }
                return $trad;
        }


}