php__silex__book/src/demo/Services/NavBuilder.php

<?php

namespace demo\Services;

use Silex\Application;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

class NavBuilder {

  /**
   * @var \Twig_Environment
   */
  protected $twig;

  /**
   * @var \Symfony\Component\Routing\Generator\UrlGeneratorInterface
   */
  protected $urlGenerator;

  public function __construct(
    UrlGeneratorInterface $urlGenerator,
    \Twig_Environment $twig
  ) {
    $this->twig = $twig;
    $this->urlGenerator = $urlGenerator;
  }

  public static function create(Application $app) {
    $urlGenerator = $app['url_generator'];
    $twig = $app['twig'];
    return new static($urlGenerator, $twig);
  }

  public function build() {
    $home = $this->urlGenerator->generate('homepage');
    $blog = $this->urlGenerator->generate('blog_list');
    $result =  [
      'home' => ['url' => $home, 'text' => 'Accueil'],
      'blog' => ['url' => $blog, 'text' => 'Blogs'],
    ];
    return $result;
  }
}