MobileFilesystemLoader.php

<?php


namespace MyBundle\Bundle\FrontendBundle\Twig\Loader;


use MyBundle\Bundle\FrontendBundle\Twig\MobileDetect;
use Symfony\Bundle\FrameworkBundle\Templating\Loader\FilesystemLoader;
use Symfony\Component\Config\FileLocatorInterface;
use Symfony\Component\Filesystem\Filesystem;
use Symfony\Component\Templating\TemplateReferenceInterface;

class MobileFilesystemLoader extends FilesystemLoader
{
    protected $detect;
    protected $fs;

    public function __construct(FileLocatorInterface $locator, MobileDetect $detect, Filesystem $filesystem)
    {
        parent::__construct($locator);
        $this->locator = $locator;
        $this->detect  = $detect;
        $this->fs      = $filesystem;
    }

    public function load(TemplateReferenceInterface $template)
    {
        $defaultFormat = $template->get('format');
        $template->set('format', $this->setExtensionForTemplate($template));
        $file = $this->locator->locate($template);
        if ($this->fs->exists($file)) {
            return parent::load($template);
        }
        $template->set('format', $defaultFormat);
        return parent::load($template);
    }


    private function isMobile()
    {
        return $this->detect->isMobile();
    }

    private function isTablet()
    {
        return $this->detect->isTablet();
    }


    private function setExtensionForTemplate(TemplateReferenceInterface $template)
    {
        $ext = $template->get('format');
        if ($this->isTablet()) {
            $ext = "tablet.html";
        }
        if ($this->isMobile()) {
            $ext = "mobile.html";
        }
        return $ext;
    }
}