DrupalRoutes.php

<?php

namespace Drupal\Core\Routes;

use Symfony\Component\Routing;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;

class DrupalRoutes {
  protected $routes;
  static protected $shared;

  public function __construct() {
    $this->routes = array();
    foreach (module_implements('menu') as $module) {
      $this->routes[$module] = module_invoke($module, 'menu');
    }
  }

  public function getRoutes() {
    if (isset(self::$shared['routes'])) {
      return self::$shared['routes'];
    }
    $routes = new RouteCollection();
    foreach ($this->routes as $module => $items) {
      foreach ($items as $path => $item) {
        $name = str_replace(array('/', '%', '-'), array('.', '_', ''), $path);
        $path_parts = explode('/', $path);
        $arguments = array(
          'arguments' => array(),
        );
        foreach ($path_parts as $key => $part) {
          if (substr($part, 0, 1) == '%') {
            $arguments['arguments'] += array($key => substr($part, 1));
            $path_parts[$key] = '{' . substr($part, 1) . '}';
          }
        }
        $path = implode('/', $path_parts);
        if (isset($item['page callback'])) {
          $item += array(
            'page arguments' => array(),
            'access callback' => 'user_access',
            'access arguments' => array(),
          );
          if (isset($item['file']) && !isset($item['file path'])) {
            $item['file path'] = drupal_get_path('module', $module);
          }
          $arguments['menu item'] = $item;
          $routes->add($name, new Route($path, $arguments));
        }
      }
    }
    return self::$shared['routes'] = $routes;
  }
}