concrete-map

dict(1) {
  ["GET"]=>
  object(Facebook\HackRouter\PrefixMatching\PrefixMap) (3) {
    ["literals":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
    dict(3) {
      ["/"]=>
      string(18) "HomePageController"
      ["/robots.txt"]=>
      string(19) "RobotsTxtController"
      ["/search"]=>
      string(16) "SearchController"
    }
    ["prefixes":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
    dict(1) {
      ["/"]=>
      object(Facebook\HackRouter\PrefixMatching\PrefixMap) (3) {
        ["literals":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
        dict(0) {
        }
        ["prefixes":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
        dict(3) {
          ["j/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMap) (3) {
            ["literals":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(0) {
            }
            ["prefixes":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(0) {
            }
            ["regexps":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(1) {
              ["(?<Keyword>[^/]+)"]=>
              object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
                ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
                NULL
                ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
                string(14) "JumpController"
              }
            }
          }
          ["ma"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMap) (3) {
            ["literals":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(0) {
            }
            ["prefixes":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(1) {
              ["nual/en/"]=>
              object(Facebook\HackRouter\PrefixMatching\PrefixMap) (3) {
                ["literals":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
                dict(0) {
                }
                ["prefixes":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
                dict(0) {
                }
                ["regexps":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
                dict(1) {
                  ["(?<LegacyId>[^/]+)\.php"]=>
                  object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
                    ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
                    NULL
                    ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
                    string(24) "LegacyRedirectController"
                  }
                }
              }
            }
            ["regexps":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(0) {
            }
          }
          ["s/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMap) (3) {
            ["literals":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(0) {
            }
            ["prefixes":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(0) {
            }
            ["regexps":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
            dict(1) {
              ["(?<Checksum>[^/]+)/(?<File>.+)"]=>
              object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
                ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
                NULL
                ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
                string(25) "StaticResourcesController"
              }
            }
          }
        }
        ["regexps":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
        dict(7) {
          ["(?<Product>(?:hack|hsl))/reference/(?<Type>(?:class|trait|interface|function))/(?<Name>[^/]+)/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
            ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            NULL
            ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            string(22) "APIClassPageController"
          }
          ["(?<Product>(?:hack|hsl))/reference/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
            ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            NULL
            ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            string(21) "APIFullListController"
          }
          ["(?<Product>(?:hack|hsl))/reference/(?<Type>(?:class|trait|interface|function))/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
            ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            NULL
            ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            string(23) "APIListByTypeController"
          }
          ["(?<Product>(?:hack|hsl))/reference/(?<Type>(?:class|trait|interface|function))/(?<Class>[^/]+)/(?<Method>[^/]+)/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
            ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            NULL
            ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            string(23) "APIMethodPageController"
          }
          ["(?<Product>(?:hhvm|hack))/(?<Guide>[^/]+)/(?<Page>[^/]+)"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
            ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            NULL
            ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            string(19) "GuidePageController"
          }
          ["(?<Product>(?:hhvm|hack))/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
            ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            NULL
            ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            string(20) "GuidesListController"
          }
          ["(?<Product>(?:hhvm|hack))/(?<Guide>[^/]+)/"]=>
          object(Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder) (2) {
            ["map":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            NULL
            ["responder":"Facebook\HackRouter\PrefixMatching\PrefixMapOrResponder":private]=>
            string(34) "RedirectToGuideFirstPageController"
          }
        }
      }
    }
    ["regexps":"Facebook\HackRouter\PrefixMatching\PrefixMap":private]=>
    dict(0) {
    }
  }
}

definition.hack

    $map = ImmMap {
      \Facebook\HackRouter\HttpMethod::GET => ImmMap {
        '/{Product:(?:hack|hsl)}/reference/{Type:(?:class|trait|interface|function)}/{Name}/' =>
          \APIClassPageController::class,
        '/{Product:(?:hack|hsl)}/reference/' => \APIFullListController::class,
        '/{Product:(?:hack|hsl)}/reference/{Type:(?:class|trait|interface|function)}/' =>
          \APIListByTypeController::class,
        '/{Product:(?:hack|hsl)}/reference/{Type:(?:class|trait|interface|function)}/{Class}/{Method}/' =>
          \APIMethodPageController::class,
        '/{Product:(?:hhvm|hack)}/{Guide}/{Page}' => \GuidePageController::class,
        '/{Product:(?:hhvm|hack)}/' => \GuidesListController::class,
        '/' => \HomePageController::class,
        '/j/{Keyword}' => \JumpController::class,
        '/manual/en/{LegacyId}.php' => \LegacyRedirectController::class,
        '/{Product:(?:hhvm|hack)}/{Guide}/' =>
          \RedirectToGuideFirstPageController::class,
        '/robots.txt' => \RobotsTxtController::class,
        '/search' => \SearchController::class,
        '/s/{Checksum}/{File:.+}' => \StaticResourcesController::class,
      },
    };

How to use this code