route.js

'use strict';

/* global shallowCopy: false */

// `isArray` and `isObject` are necessary for `shallowCopy()` (included via `src/shallowCopy.js`).
// They are initialized inside the `$RouteProvider`, to ensure `window.angular` is available.
var isArray;
var isObject;
var isDefined;
var noop;

/**
 * @ngdoc module
 * @name ngRoute
 * @description
 *
 * The `ngRoute` module provides routing and deeplinking services and directives for AngularJS apps.
 *
 * ## Example
 * See {@link ngRoute.$route#examples $route} for an example of configuring and using `ngRoute`.
 *
 */
/* global -ngRouteModule */
var ngRouteModule = angular.
  module('ngRoute', []).
  info({ angularVersion: '"NG_VERSION_FULL"' }).
  provider('$route', $RouteProvider).
  // Ensure `$route` will be instantiated in time to capture the initial `$locationChangeSuccess`
  // event (unless explicitly disabled). This is necessary in case `ngView` is included in an
  // asynchronously loaded template.
  run(instantiateRoute);
var $routeMinErr = angular.$$minErr('ngRoute');
var isEagerInstantiationEnabled;


/**
 * @ngdoc provider
 * @name $routeProvider
 * @this
 *
 * @description
 *
 * Used for configuring routes.
 *
 * ## Example
 * See {@link ngRoute.$route#examples $route} for an example of configuring and using `ngRoute`.
 *
 * ## Dependencies
 * Requires the {@link ngRoute `ngRoute`} module to be installed.
 */
function $RouteProvider() {
  isArray = angular.isArray;
  isObject = angular.isObject;
  isDefined = angular.isDefined;
  noop = angular.noop;

  function inherit(parent, extra) {
    return angular.extend(Object.create(parent), extra);
  }

  var routes = {};

  /**
   * @ngdoc method
   * @name $routeProvider#when
   *
   * @param {string} path Route path (matched against `$location.path`). If `$location.path`
   *    contains redundant trailing slash or is missing one, the route will still match and the
   *    `$location.path` will be updated to add or drop the trailing slash to exactly match the
   *    route definition.
   *
   *    * `path` can contain named groups starting with a colon: e.g. `:name`. All characters up
   *        to the next slash are matched and stored in `$routeParams` under the given `name`
   *        when the route matches.
   *    * `path` can contain named groups starting with a colon and ending with a star:
   *        e.g.`:name*`. All characters are eagerly stored in `$routeParams` under the given `name`
   *        when the route matches.
   *    * `path` can contain optional named groups with a question mark: e.g.`:name?`.
   *
   *    For example, routes like `/color/:color/largecode/:largecode*\/edit` will match
   *    `/color/brown/largecode/code/with/slashes/edit` and extract:
   *
   *    * `color: brown`
   *    * `largecode: code/with/slashes`.
   *
   *
   * @param {Object} route Mapping information to be assigned to `$route.current` on route
   *    match.
   *
   *    Object properties:
   *
   *    - `controller` – `{(string|Function)=}` – Controller fn that should be associated with
   *      newly created scope or the name of a {@link angular.Module#controller registered
   *      controller} if passed as a string.
   *    - `controllerAs` – `{string=}` – An identifier name for a reference to the controller.
   *      If present, the controller will be published to scope under the `controllerAs` name.
   *    - `template` – `{(string|Function)=}` – html template as a string or a function that
   *      returns an html template as a string which should be used by {@link
   *      ngRoute.directive:ngView ngView} or {@link ng.directive:ngInclude ngInclude} directives.
   *      This property takes precedence over `templateUrl`.
   *
   *      If `template` is a function, it will be called with the following parameters:
   *
   *      - `{Array.<Object>}` - route parameters extracted from the current
   *        `$location.path()` by applying the current route
   *
   *      One of `template` or `templateUrl` is required.
   *
   *    - `templateUrl` – `{(string|Function)=}` – path or function that returns a path to an html
   *      template that should be used by {@link ngRoute.directive:ngView ngView}.
   *
   *      If `templateUrl` is a function, it will be called with the following parameters:
   *
   *      - `{Array.<Object>}` - route parameters extracted from the current
   *        `$location.path()` by applying the current route
   *
   *      One of `templateUrl` or `template` is required.
   *
   *    - `resolve` - `{Object.<string, Function>=}` - An optional map of dependencies which should
   *      be injected into the controller. If any of these dependencies are promises, the router
   *      will wait for them all to be resolved or one to be rejected before the controller is
   *      instantiated.
   *      If all the promises are resolved successfully, the values of the resolved promises are
   *      injected and {@link ngRoute.$route#$routeChangeSuccess $routeChangeSuccess} event is
   *      fired. If any of the promises are rejected the
   *      {@link ngRoute.$route#$routeChangeError $routeChangeError} event is fired.
   *      For easier access to the resolved dependencies from the template, the `resolve` map will
   *      be available on the scope of the route, under `$resolve` (by default) or a custom name
   *      specified by the `resolveAs` property (see below). This can be particularly useful, when
   *      working with {@link angular.Module#component components} as route templates.<br />
   *      <div class="alert alert-warning">
   *        **Note:** If your scope already contains a property with this name, it will be hidden
   *        or overwritten. Make sure, you specify an appropriate name for this property, that
   *        does not collide with other properties on the scope.
   *      </div>
   *      The map object is:
   *
   *      - `key` – `{string}`: a name of a dependency to be injected into the controller.
   *      - `factory` - `{string|Function}`: If `string` then it is an alias for a service.
   *        Otherwise if function, then it is {@link auto.$injector#invoke injected}
   *        and the return value is treated as the dependency. If the result is a promise, it is
   *        resolved before its value is injected into the controller. Be aware that
   *        `ngRoute.$routeParams` will still refer to the previous route within these resolve
   *        functions.  Use `$route.current.params` to access the new route parameters, instead.
   *
   *    - `resolveAs` - `{string=}` - The name under which the `resolve` map will be available on
   *      the scope of the route. If omitted, defaults to `$resolve`.
   *
   *    - `redirectTo` – `{(string|Function)=}` – value to update
   *      {@link ng.$location $location} path with and trigger route redirection.
   *
   *      If `redirectTo` is a function, it will be called with the following parameters:
   *
   *      - `{Object.<string>}` - route parameters extracted from the current
   *        `$location.path()` by applying the current route templateUrl.
   *      - `{string}` - current `$location.path()`
   *      - `{Object}` - current `$location.search()`
   *
   *      The custom `redirectTo` function is expected to return a string which will be used
   *      to update `$location.url()`. If the function throws an error, no further processing will
   *      take place and the {@link ngRoute.$route#$routeChangeError $routeChangeError} event will
   *      be fired.
   *
   *      Routes that specify `redirectTo` will not have their controllers, template functions
   *      or resolves called, the `$location` will be changed to the redirect url and route
   *      processing will stop. The exception to this is if the `redirectTo` is a function that
   *      returns `undefined`. In this case the route transition occurs as though there was no
   *      redirection.
   *
   *    - `resolveRedirectTo` – `{Function=}` – a function that will (eventually) return the value
   *      to update {@link ng.$location $location} URL with and trigger route redirection. In
   *      contrast to `redirectTo`, dependencies can be injected into `resolveRedirectTo` and the
   *      return value can be either a string or a promise that will be resolved to a string.
   *
   *      Similar to `redirectTo`, if the return value is `undefined` (or a promise that gets
   *      resolved to `undefined`), no redirection takes place and the route transition occurs as
   *      though there was no redirection.
   *
   *      If the function throws an error or the returned promise gets rejected, no further
   *      processing will take place and the
   *      {@link ngRoute.$route#$routeChangeError $routeChangeError} event will be fired.
   *
   *      `redirectTo` takes precedence over `resolveRedirectTo`, so specifying both on the same
   *      route definition, will cause the latter to be ignored.
   *
   *    - `[reloadOnSearch=true]` - `{boolean=}` - reload route when only `$location.search()`
   *      or `$location.hash()` changes.
   *
   *      If the option is set to `false` and url in the browser changes, then
   *      `$routeUpdate` event is broadcasted on the root scope.
   *
   *    - `[caseInsensitiveMatch=false]` - `{boolean=}` - match routes without being case sensitive
   *
   *      If the option is set to `true`, then the particular route can be matched without being
   *      case sensitive
   *
   * @returns {Object} self
   *
   * @description
   * Adds a new route definition to the `$route` service.
   */
  this.when = function(path, route) {
    //copy original route object to preserve params inherited from proto chain
    var routeCopy = shallowCopy(route);
    if (angular.isUndefined(routeCopy.reloadOnSearch)) {
      routeCopy.reloadOnSearch = true;
    }
    if (angular.isUndefined(routeCopy.caseInsensitiveMatch)) {
      routeCopy.caseInsensitiveMatch = this.caseInsensitiveMatch;
    }
    routes[path] = angular.extend(
      routeCopy,
      path && pathRegExp(path, routeCopy)
    );

    // create redirection for trailing slashes
    if (path) {
      var redirectPath = (path[path.length - 1] === '/')
            ? path.substr(0, path.length - 1)
            : path + '/';

      routes[redirectPath] = angular.extend(
        {redirectTo: path},
        pathRegExp(redirectPath, routeCopy)
      );
    }

    return this;
  };

  /**
   * @ngdoc property
   * @name $routeProvider#caseInsensitiveMatch
   * @description
   *
   * A boolean property indicating if routes defined
   * using this provider should be matched using a case insensitive
   * algorithm. Defaults to `false`.
   */
  this.caseInsensitiveMatch = false;

   /**
    * @param path {string} path
    * @param opts {Object} options
    * @return {?Object}
    *
    * @description
    * Normalizes the given path, returning a regular expression
    * and the original path.
    *
    * Inspired by pathRexp in visionmedia/express/lib/utils.js.
    */
  function pathRegExp(path, opts) {
    var insensitive = opts.caseInsensitiveMatch,
        ret = {
          originalPath: path,
          regexp: path
        },
        keys = ret.keys = [];

    path = path
      .replace(/([().])/g, '\\$1')
      .replace(/(\/)?:(\w+)(\*\?|[?*])?/g, function(_, slash, key, option) {
        var optional = (option === '?' || option === '*?') ? '?' : null;
        var star = (option === '*' || option === '*?') ? '*' : null;
        keys.push({ name: key, optional: !!optional });
        slash = slash || '';
        return ''
          + (optional ? '' : slash)
          + '(?:'
          + (optional ? slash : '')
          + (star && '(.+?)' || '([^/]+)')
          + (optional || '')
          + ')'
          + (optional || '');
      })
      .replace(/([/$*])/g, '\\$1');

    ret.regexp = new RegExp('^' + path + '$', insensitive ? 'i' : '');
    return ret;
  }

  /**
   * @ngdoc method
   * @name $routeProvider#otherwise
   *
   * @description
   * Sets route definition that will be used on route change when no other route definition
   * is matched.
   *
   * @param {Object|string} params Mapping information to be assigned to `$route.current`.
   * If called with a string, the value maps to `redirectTo`.
   * @returns {Object} self
   */
  this.otherwise = function(params) {
    if (typeof params === 'string') {
      params = {redirectTo: params};
    }
    this.when(null, params);
    return this;
  };

  /**
   * @ngdoc method
   * @name $routeProvider#eagerInstantiationEnabled
   * @kind function
   *
   * @description
   * Call this method as a setter to enable/disable eager instantiation of the
   * {@link ngRoute.$route $route} service upon application bootstrap. You can also call it as a
   * getter (i.e. without any arguments) to get the current value of the
   * `eagerInstantiationEnabled` flag.
   *
   * Instantiating `$route` early is necessary for capturing the initial
   * {@link ng.$location#$locationChangeStart $locationChangeStart} event and navigating to the
   * appropriate route. Usually, `$route` is instantiated in time by the
   * {@link ngRoute.ngView ngView} directive. Yet, in cases where `ngView` is included in an
   * asynchronously loaded template (e.g. in another directive's template), the directive factory
   * might not be called soon enough for `$route` to be instantiated _before_ the initial
   * `$locationChangeSuccess` event is fired. Eager instantiation ensures that `$route` is always
   * instantiated in time, regardless of when `ngView` will be loaded.
   *
   * The default value is true.
   *
   * **Note**:<br />
   * You may want to disable the default behavior when unit-testing modules that depend on
   * `ngRoute`, in order to avoid an unexpected request for the default route's template.
   *
   * @param {boolean=} enabled - If provided, update the internal `eagerInstantiationEnabled` flag.
   *
   * @returns {*} The current value of the `eagerInstantiationEnabled` flag if used as a getter or
   *     itself (for chaining) if used as a setter.
   */
  isEagerInstantiationEnabled = true;
  this.eagerInstantiationEnabled = function eagerInstantiationEnabled(enabled) {
    if (isDefined(enabled)) {
      isEagerInstantiationEnabled = enabled;
      return this;
    }

    return isEagerInstantiationEnabled;
  };


  this.$get = ['$rootScope',
               '$location',
               '$routeParams',
               '$q',
               '$injector',
               '$templateRequest',
               '$sce',
               '$browser',
      function($rootScope, $location, $routeParams, $q, $injector, $templateRequest, $sce, $browser) {

    /**
     * @ngdoc service
     * @name $route
     * @requires $location
     * @requires $routeParams
     *
     * @property {Object} current Reference to the current route definition.
     * The route definition contains:
     *
     *   - `controller`: The controller constructor as defined in the route definition.
     *   - `locals`: A map of locals which is used by {@link ng.$controller $controller} service for
     *     controller instantiation. The `locals` contain
     *     the resolved values of the `resolve` map. Additionally the `locals` also contain:
     *
     *     - `$scope` - The current route scope.
     *     - `$template` - The current route template HTML.
     *
     *     The `locals` will be assigned to the route scope's `$resolve` property. You can override
     *     the property name, using `resolveAs` in the route definition. See
     *     {@link ngRoute.$routeProvider $routeProvider} for more info.
     *
     * @property {Object} routes Object with all route configuration Objects as its properties.
     *
     * @description
     * `$route` is used for deep-linking URLs to controllers and views (HTML partials).
     * It watches `$location.url()` and tries to map the path to an existing route definition.
     *
     * Requires the {@link ngRoute `ngRoute`} module to be installed.
     *
     * You can define routes through {@link ngRoute.$routeProvider $routeProvider}'s API.
     *
     * The `$route` service is typically used in conjunction with the
     * {@link ngRoute.directive:ngView `ngView`} directive and the
     * {@link ngRoute.$routeParams `$routeParams`} service.
     *
     * @example
     * This example shows how changing the URL hash causes the `$route` to match a route against the
     * URL, and the `ngView` pulls in the partial.
     *
     * <example name="$route-service" module="ngRouteExample"
     *          deps="angular-route.js" fixBase="true">
     *   <file name="index.html">
     *     <div ng-controller="MainController">
     *       Choose:
     *       <a href="Book/Moby">Moby</a> |
     *       <a href="Book/Moby/ch/1">Moby: Ch1</a> |
     *       <a href="Book/Gatsby">Gatsby</a> |
     *       <a href="Book/Gatsby/ch/4?key=value">Gatsby: Ch4</a> |
     *       <a href="Book/Scarlet">Scarlet Letter</a><br/>
     *
     *       <div ng-view></div>
     *
     *       <hr />
     *
     *       <pre>$location.path() = {{$location.path()}}</pre>
     *       <pre>$route.current.templateUrl = {{$route.current.templateUrl}}</pre>
     *       <pre>$route.current.params = {{$route.current.params}}</pre>
     *       <pre>$route.current.scope.name = {{$route.current.scope.name}}</pre>
     *       <pre>$routeParams = {{$routeParams}}</pre>
     *     </div>
     *   </file>
     *
     *   <file name="book.html">
     *     controller: {{name}}<br />
     *     Book Id: {{params.bookId}}<br />
     *   </file>
     *
     *   <file name="chapter.html">
     *     controller: {{name}}<br />
     *     Book Id: {{params.bookId}}<br />
     *     Chapter Id: {{params.chapterId}}
     *   </file>
     *
     *   <file name="script.js">
     *     angular.module('ngRouteExample', ['ngRoute'])
     *
     *      .controller('MainController', function($scope, $route, $routeParams, $location) {
     *          $scope.$route = $route;
     *          $scope.$location = $location;
     *          $scope.$routeParams = $routeParams;
     *      })
     *
     *      .controller('BookController', function($scope, $routeParams) {
     *          $scope.name = 'BookController';
     *          $scope.params = $routeParams;
     *      })
     *
     *      .controller('ChapterController', function($scope, $routeParams) {
     *          $scope.name = 'ChapterController';
     *          $scope.params = $routeParams;
     *      })
     *
     *     .config(function($routeProvider, $locationProvider) {
     *       $routeProvider
     *        .when('/Book/:bookId', {
     *         templateUrl: 'book.html',
     *         controller: 'BookController',
     *         resolve: {
     *           // I will cause a 1 second delay
     *           delay: function($q, $timeout) {
     *             var delay = $q.defer();
     *             $timeout(delay.resolve, 1000);
     *             return delay.promise;
     *           }
     *         }
     *       })
     *       .when('/Book/:bookId/ch/:chapterId', {
     *         templateUrl: 'chapter.html',
     *         controller: 'ChapterController'
     *       });
     *
     *       // configure html5 to get links working on jsfiddle
     *       $locationProvider.html5Mode(true);
     *     });
     *
     *   </file>
     *
     *   <file name="protractor.js" type="protractor">
     *     it('should load and compile correct template', function() {
     *       element(by.linkText('Moby: Ch1')).click();
     *       var content = element(by.css('[ng-view]')).getText();
     *       expect(content).toMatch(/controller: ChapterController/);
     *       expect(content).toMatch(/Book Id: Moby/);
     *       expect(content).toMatch(/Chapter Id: 1/);
     *
     *       element(by.partialLinkText('Scarlet')).click();
     *
     *       content = element(by.css('[ng-view]')).getText();
     *       expect(content).toMatch(/controller: BookController/);
     *       expect(content).toMatch(/Book Id: Scarlet/);
     *     });
     *   </file>
     * </example>
     */

    /**
     * @ngdoc event
     * @name $route#$routeChangeStart
     * @eventType broadcast on root scope
     * @description
     * Broadcasted before a route change. At this  point the route services starts
     * resolving all of the dependencies needed for the route change to occur.
     * Typically this involves fetching the view template as well as any dependencies
     * defined in `resolve` route property. Once  all of the dependencies are resolved
     * `$routeChangeSuccess` is fired.
     *
     * The route change (and the `$location` change that triggered it) can be prevented
     * by calling `preventDefault` method of the event. See {@link ng.$rootScope.Scope#$on}
     * for more details about event object.
     *
     * @param {Object} angularEvent Synthetic event object.
     * @param {Route} next Future route information.
     * @param {Route} current Current route information.
     */

    /**
     * @ngdoc event
     * @name $route#$routeChangeSuccess
     * @eventType broadcast on root scope
     * @description
     * Broadcasted after a route change has happened successfully.
     * The `resolve` dependencies are now available in the `current.locals` property.
     *
     * {@link ngRoute.directive:ngView ngView} listens for the directive
     * to instantiate the controller and render the view.
     *
     * @param {Object} angularEvent Synthetic event object.
     * @param {Route} current Current route information.
     * @param {Route|Undefined} previous Previous route information, or undefined if current is
     * first route entered.
     */

    /**
     * @ngdoc event
     * @name $route#$routeChangeError
     * @eventType broadcast on root scope
     * @description
     * Broadcasted if a redirection function fails or any redirection or resolve promises are
     * rejected.
     *
     * @param {Object} angularEvent Synthetic event object
     * @param {Route} current Current route information.
     * @param {Route} previous Previous route information.
     * @param {Route} rejection The thrown error or the rejection reason of the promise. Usually
     * the rejection reason is the error that caused the promise to get rejected.
     */

    /**
     * @ngdoc event
     * @name $route#$routeUpdate
     * @eventType broadcast on root scope
     * @description
     * The `reloadOnSearch` property has been set to false, and we are reusing the same
     * instance of the Controller.
     *
     * @param {Object} angularEvent Synthetic event object
     * @param {Route} current Current/previous route information.
     */

    var forceReload = false,
        preparedRoute,
        preparedRouteIsUpdateOnly,
        $route = {
          routes: routes,

          /**
           * @ngdoc method
           * @name $route#reload
           *
           * @description
           * Causes `$route` service to reload the current route even if
           * {@link ng.$location $location} hasn't changed.
           *
           * As a result of that, {@link ngRoute.directive:ngView ngView}
           * creates new scope and reinstantiates the controller.
           */
          reload: function() {
            forceReload = true;

            var fakeLocationEvent = {
              defaultPrevented: false,
              preventDefault: function fakePreventDefault() {
                this.defaultPrevented = true;
                forceReload = false;
              }
            };

            $rootScope.$evalAsync(function() {
              prepareRoute(fakeLocationEvent);
              if (!fakeLocationEvent.defaultPrevented) commitRoute();
            });
          },

          /**
           * @ngdoc method
           * @name $route#updateParams
           *
           * @description
           * Causes `$route` service to update the current URL, replacing
           * current route parameters with those specified in `newParams`.
           * Provided property names that match the route's path segment
           * definitions will be interpolated into the location's path, while
           * remaining properties will be treated as query params.
           *
           * @param {!Object<string, string>} newParams mapping of URL parameter names to values
           */
          updateParams: function(newParams) {
            if (this.current && this.current.$$route) {
              newParams = angular.extend({}, this.current.params, newParams);
              $location.path(interpolate(this.current.$$route.originalPath, newParams));
              // interpolate modifies newParams, only query params are left
              $location.search(newParams);
            } else {
              throw $routeMinErr('norout', 'Tried updating route with no current route');
            }
          }
        };

    $rootScope.$on('$locationChangeStart', prepareRoute);
    $rootScope.$on('$locationChangeSuccess', commitRoute);

    return $route;

    /////////////////////////////////////////////////////

    /**
     * @param on {string} current url
     * @param route {Object} route regexp to match the url against
     * @return {?Object}
     *
     * @description
     * Check if the route matches the current url.
     *
     * Inspired by match in
     * visionmedia/express/lib/router/router.js.
     */
    function switchRouteMatcher(on, route) {
      var keys = route.keys,
          params = {};

      if (!route.regexp) return null;

      var m = route.regexp.exec(on);
      if (!m) return null;

      for (var i = 1, len = m.length; i < len; ++i) {
        var key = keys[i - 1];

        var val = m[i];

        if (key && val) {
          params[key.name] = val;
        }
      }
      return params;
    }

    function prepareRoute($locationEvent) {
      var lastRoute = $route.current;

      preparedRoute = parseRoute();
      preparedRouteIsUpdateOnly = preparedRoute && lastRoute && preparedRoute.$$route === lastRoute.$$route
          && angular.equals(preparedRoute.pathParams, lastRoute.pathParams)
          && !preparedRoute.reloadOnSearch && !forceReload;

      if (!preparedRouteIsUpdateOnly && (lastRoute || preparedRoute)) {
        if ($rootScope.$broadcast('$routeChangeStart', preparedRoute, lastRoute).defaultPrevented) {
          if ($locationEvent) {
            $locationEvent.preventDefault();
          }
        }
      }
    }

    function commitRoute() {
      var lastRoute = $route.current;
      var nextRoute = preparedRoute;

      if (preparedRouteIsUpdateOnly) {
        lastRoute.params = nextRoute.params;
        angular.copy(lastRoute.params, $routeParams);
        $rootScope.$broadcast('$routeUpdate', lastRoute);
      } else if (nextRoute || lastRoute) {
        forceReload = false;
        $route.current = nextRoute;

        var nextRoutePromise = $q.resolve(nextRoute);

        $browser.$$incOutstandingRequestCount();

        nextRoutePromise.
          then(getRedirectionData).
          then(handlePossibleRedirection).
          then(function(keepProcessingRoute) {
            return keepProcessingRoute && nextRoutePromise.
              then(resolveLocals).
              then(function(locals) {
                // after route change
                if (nextRoute === $route.current) {
                  if (nextRoute) {
                    nextRoute.locals = locals;
                    angular.copy(nextRoute.params, $routeParams);
                  }
                  $rootScope.$broadcast('$routeChangeSuccess', nextRoute, lastRoute);
                }
              });
          }).catch(function(error) {
            if (nextRoute === $route.current) {
              $rootScope.$broadcast('$routeChangeError', nextRoute, lastRoute, error);
            }
          }).finally(function() {
            // Because `commitRoute()` is called from a `$rootScope.$evalAsync` block (see
            // `$locationWatch`), this `$$completeOutstandingRequest()` call will not cause
            // `outstandingRequestCount` to hit zero.  This is important in case we are redirecting
            // to a new route which also requires some asynchronous work.

            $browser.$$completeOutstandingRequest(noop);
          });
      }
    }

    function getRedirectionData(route) {
      var data = {
        route: route,
        hasRedirection: false
      };

      if (route) {
        if (route.redirectTo) {
          if (angular.isString(route.redirectTo)) {
            data.path = interpolate(route.redirectTo, route.params);
            data.search = route.params;
            data.hasRedirection = true;
          } else {
            var oldPath = $location.path();
            var oldSearch = $location.search();
            var newUrl = route.redirectTo(route.pathParams, oldPath, oldSearch);

            if (angular.isDefined(newUrl)) {
              data.url = newUrl;
              data.hasRedirection = true;
            }
          }
        } else if (route.resolveRedirectTo) {
          return $q.
            resolve($injector.invoke(route.resolveRedirectTo)).
            then(function(newUrl) {
              if (angular.isDefined(newUrl)) {
                data.url = newUrl;
                data.hasRedirection = true;
              }

              return data;
            });
        }
      }

      return data;
    }

    function handlePossibleRedirection(data) {
      var keepProcessingRoute = true;

      if (data.route !== $route.current) {
        keepProcessingRoute = false;
      } else if (data.hasRedirection) {
        var oldUrl = $location.url();
        var newUrl = data.url;

        if (newUrl) {
          $location.
            url(newUrl).
            replace();
        } else {
          newUrl = $location.
            path(data.path).
            search(data.search).
            replace().
            url();
        }

        if (newUrl !== oldUrl) {
          // Exit out and don't process current next value,
          // wait for next location change from redirect
          keepProcessingRoute = false;
        }
      }

      return keepProcessingRoute;
    }

    function resolveLocals(route) {
      if (route) {
        var locals = angular.extend({}, route.resolve);
        angular.forEach(locals, function(value, key) {
          locals[key] = angular.isString(value) ?
              $injector.get(value) :
              $injector.invoke(value, null, null, key);
        });
        var template = getTemplateFor(route);
        if (angular.isDefined(template)) {
          locals['$template'] = template;
        }
        return $q.all(locals);
      }
    }

    function getTemplateFor(route) {
      var template, templateUrl;
      if (angular.isDefined(template = route.template)) {
        if (angular.isFunction(template)) {
          template = template(route.params);
        }
      } else if (angular.isDefined(templateUrl = route.templateUrl)) {
        if (angular.isFunction(templateUrl)) {
          templateUrl = templateUrl(route.params);
        }
        if (angular.isDefined(templateUrl)) {
          route.loadedTemplateUrl = $sce.valueOf(templateUrl);
          template = $templateRequest(templateUrl);
        }
      }
      return template;
    }

    /**
     * @returns {Object} the current active route, by matching it against the URL
     */
    function parseRoute() {
      // Match a route
      var params, match;
      angular.forEach(routes, function(route, path) {
        if (!match && (params = switchRouteMatcher($location.path(), route))) {
          match = inherit(route, {
            params: angular.extend({}, $location.search(), params),
            pathParams: params});
          match.$$route = route;
        }
      });
      // No route matched; fallback to "otherwise" route
      return match || routes[null] && inherit(routes[null], {params: {}, pathParams:{}});
    }

    /**
     * @returns {string} interpolation of the redirect path with the parameters
     */
    function interpolate(string, params) {
      var result = [];
      angular.forEach((string || '').split(':'), function(segment, i) {
        if (i === 0) {
          result.push(segment);
        } else {
          var segmentMatch = segment.match(/(\w+)(?:[?*])?(.*)/);
          var key = segmentMatch[1];
          result.push(params[key]);
          result.push(segmentMatch[2] || '');
          delete params[key];
        }
      });
      return result.join('');
    }
  }];
}

instantiateRoute.$inject = ['$injector'];
function instantiateRoute($injector) {
  if (isEagerInstantiationEnabled) {
    // Instantiate `$route`
    $injector.get('$route');
  }
}