route.js

'use strict';

/**
 * @ngdoc overview
 * @name ngRoute
 * @description
 *
 * # ngRoute
 *
 * The `ngRoute` module provides routing and deeplinking services and directives for angular apps.
 *
 * ## Example
 * See {@link ngRoute.$route#example $route} for an example of configuring and using `ngRoute`.
 * 
 * {@installModule route}
 *
 * <div doc-module-components="ngRoute"></div>
 */
 /* global -ngRouteModule */
var ngRouteModule = angular.module('ngRoute', ['ng']).
                        provider('$route', $RouteProvider);

/**
 * @ngdoc object
 * @name ngRoute.$routeProvider
 * @function
 *
 * @description
 *
 * Used for configuring routes.
 * 
 * ## Example
 * See {@link ngRoute.$route#example $route} for an example of configuring and using `ngRoute`.
 *
 * ## Dependencies
 * Requires the {@link ngRoute `ngRoute`} module to be installed.
 */
function $RouteProvider(){
  function inherit(parent, extra) {
    return angular.extend(new (angular.extend(function() {}, {prototype:parent}))(), extra);
  }

  var routes = {};

  /**
   * @ngdoc method
   * @name ngRoute.$routeProvider#when
   * @methodOf ngRoute.$routeProvider
   *
   * @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 `$routeParams` under the given `name`
   *        when the route matches.
   *      * `path` can contain optional named groups with a question mark: e.g.`:name?`.
   *
   *    For example, routes like `/color/:color/largecode/:largecode*\/edit` will match
   *    `/color/brown/largecode/code/with/slashs/edit` and extract:
   *
   *      * `color: brown`
   *      * `largecode: code/with/slashs`.
   *
   *
   * @param {Object} route Mapping information to be assigned to `$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=}` – A controller alias name. 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
   *        `$location.path()` by applying the current route
   *
   *    - `templateUrl` – `{string=|function()=}` – path or function that returns a path to an html
   *      template that should be used by {@link ngRoute.directive:ngView ngView}.
   *
   *      If `templateUrl` is a function, it will be called with the following parameters:
   *
   *      - `{Array.<Object>}` - route parameters extracted from the current
   *        `$location.path()` by applying the current route
   *
   *    - `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 $routeChangeError} event is fired. The map object
   *      is:
   *
   *      - `key` – `{string}`: a name of a dependency to be injected into the controller.
   *      - `factory` - `{string|function}`: If `string` then it is an alias for a service.
   *        Otherwise if function, then it is {@link api/AUTO.$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.
   *
   *    - `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 `$location.path()` and `$location.search()`.
   *
   *    - `[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) {
    routes[path] = angular.extend(
      {reloadOnSearch: true},
      route,
      path && pathRegExp(path, route)
    );

    // 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, route)
      );
    }

    return this;
  };

   /**
    * @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 ngRoute.$routeProvider#otherwise
   * @methodOf ngRoute.$routeProvider
   *
   * @description
   * Sets route definition that will be used on route change when no other route definition
   * is matched.
   *
   * @param {Object} params Mapping information to be assigned to `$route.current`.
   * @returns {Object} self
   */
  this.otherwise = function(params) {
    this.when(null, params);
    return this;
  };


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

    /**
     * @ngdoc object
     * @name ngRoute.$route
     * @requires $location
     * @requires $routeParams
     *
     * @property {Object} current Reference to the current route definition.
     * The route definition contains:
     *
     *   - `controller`: The controller constructor as define in route definition.
     *   - `locals`: A map of locals which is used by {@link ng.$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.
     *     - `$template` - The current route template HTML.
     *
     * @property {Array.<Object>} routes Array of all configured routes.
     *
     * @description
     * `$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.

       Note that this example is using {@link ng.directive:script inlined templates}
       to get it working on jsfiddle as well.

     <example module="ngViewExample" deps="angular-route.js">
       <file name="index.html">
         <div ng-controller="MainCntl">
           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('ngViewExample', ['ngRoute'])

         .config(function($routeProvider, $locationProvider) {
           $routeProvider.when('/Book/:bookId', {
             templateUrl: 'book.html',
             controller: BookCntl,
             resolve: {
               // I will cause a 1 second delay
               delay: function($q, $timeout) {
                 var delay = $q.defer();
                 $timeout(delay.resolve, 1000);
                 return delay.promise;
               }
             }
           });
           $routeProvider.when('/Book/:bookId/ch/:chapterId', {
             templateUrl: 'chapter.html',
             controller: ChapterCntl
           });

           // configure html5 to get links working on jsfiddle
           $locationProvider.html5Mode(true);
         });

         function MainCntl($scope, $route, $routeParams, $location) {
           $scope.$route = $route;
           $scope.$location = $location;
           $scope.$routeParams = $routeParams;
         }

         function BookCntl($scope, $routeParams) {
           $scope.name = "BookCntl";
           $scope.params = $routeParams;
         }

         function ChapterCntl($scope, $routeParams) {
           $scope.name = "ChapterCntl";
           $scope.params = $routeParams;
         }
       </file>

       <file name="scenario.js">
         it('should load and compile correct template', function() {
           element('a:contains("Moby: Ch1")').click();
           var content = element('.doc-example-live [ng-view]').text();
           expect(content).toMatch(/controller\: ChapterCntl/);
           expect(content).toMatch(/Book Id\: Moby/);
           expect(content).toMatch(/Chapter Id\: 1/);

           element('a:contains("Scarlet")').click();
           sleep(2); // promises are not part of scenario waiting
           content = element('.doc-example-live [ng-view]').text();
           expect(content).toMatch(/controller\: BookCntl/);
           expect(content).toMatch(/Book Id\: Scarlet/);
         });
       </file>
     </example>
     */

    /**
     * @ngdoc event
     * @name ngRoute.$route#$routeChangeStart
     * @eventOf ngRoute.$route
     * @eventType broadcast on root scope
     * @description
     * Broadcasted before a route change. At this  point the route services starts
     * resolving all of the dependencies needed for the route change to occurs.
     * Typically this involves fetching the view template as well as any dependencies
     * defined in `resolve` route property. Once  all of the dependencies are resolved
     * `$routeChangeSuccess` is fired.
     *
     * The route change may be cancelled with angularEvent.preventDefault(), which will
     * in turn trigger a {@link ngRoute.$route#events_$routeChangeCancelled $routeChangeCancelled}
     * event.
     *
     * @param {Object} angularEvent Synthetic event object.
     * @param {Route} next Future route information.
     * @param {Route} current Current route information.
     */

    /**
     * @ngdoc event
     * @name ngRoute.$route#$routeChangeCancelled
     * @eventOf ngRoute.$route
     * @eventType broadcast on root scope
     * @description
     * Broadcasted after a route has been cancelled during
     * {@link ngRoute.$route#events_$routeChangeStart $routeChangStart}, using the
     * angularEvent.preventDefault() method. This method enables applications to prevent
     * a route change from occurring without any additional work.
     *
     * @param {Object} angularEvent Synthetic event object.
     * @param {Route} cancelled The cancelled route information.
     * @param {Route} current Current route information.
     */

    /**
     * @ngdoc event
     * @name ngRoute.$route#$routeChangeSuccess
     * @eventOf ngRoute.$route
     * @eventType broadcast on root scope
     * @description
     * Broadcasted after a route dependencies are resolved.
     * {@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 ngRoute.$route#$routeChangeError
     * @eventOf ngRoute.$route
     * @eventType broadcast on root scope
     * @description
     * Broadcasted if any of the 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 Rejection of the promise. Usually the error of the failed promise.
     */

    /**
     * @ngdoc event
     * @name ngRoute.$route#$routeUpdate
     * @eventOf ngRoute.$route
     * @eventType broadcast on root scope
     * @description
     *
     * The `reloadOnSearch` property has been set to false, and we are reusing the same
     * instance of the Controller.
     */

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

          /**
           * @ngdoc method
           * @name ngRoute.$route#reload
           * @methodOf ngRoute.$route
           *
           * @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, reinstantiates the controller.
           */
          reload: function() {
            forceReload = true;
            $rootScope.$evalAsync(updateRoute);
          }
        };

    updateRoute();
    $rootScope.$on('$locationChangeSuccess', updateRoute);

    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 = 'string' == typeof m[i]
              ? decodeURIComponent(m[i])
              : m[i];

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

    function updateRoute($event, newUrl, oldUrl) {
      var next = parseRoute(),
          last = $route.current;

      if (next && last && next.$$route === last.$$route
          && angular.equals(next.pathParams, last.pathParams)
          && !next.reloadOnSearch && !forceReload) {
        last.params = next.params;
        angular.copy(last.params, $routeParams);
        $rootScope.$broadcast('$routeUpdate', last);
      } else if (next || last) {
        if ($rootScope.$broadcast('$routeChangeStart', next, last).defaultPrevented &&
            !forceReload) {
          $location.$$parse($location.$$rewrite(oldUrl));
          $rootScope.$broadcast('$routeChangeCancelled', next, last);
          return;
        }
        forceReload = false;
        $route.current = next;
        if (next) {
          if (next.redirectTo) {
            if (angular.isString(next.redirectTo)) {
              $location.path(interpolate(next.redirectTo, next.params)).search(next.params)
                       .replace();
            } else {
              $location.url(next.redirectTo(next.pathParams, $location.path(), $location.search()))
                       .replace();
            }
          }
        }

        $q.when(next).
          then(function() {
            if (next) {
              var locals = angular.extend({}, next.resolve),
                  template, templateUrl;

              angular.forEach(locals, function(value, key) {
                locals[key] = angular.isString(value) ?
                    $injector.get(value) : $injector.invoke(value);
              });

              if (angular.isDefined(template = next.template)) {
                if (angular.isFunction(template)) {
                  template = template(next.params);
                }
              } else if (angular.isDefined(templateUrl = next.templateUrl)) {
                if (angular.isFunction(templateUrl)) {
                  templateUrl = templateUrl(next.params);
                }
                templateUrl = $sce.getTrustedResourceUrl(templateUrl);
                if (angular.isDefined(templateUrl)) {
                  next.loadedTemplateUrl = templateUrl;
                  template = $http.get(templateUrl, {cache: $templateCache}).
                      then(function(response) { return response.data; });
                }
              }
              if (angular.isDefined(template)) {
                locals['$template'] = template;
              }
              return $q.all(locals);
            }
          }).
          // after route change
          then(function(locals) {
            if (next == $route.current) {
              if (next) {
                next.locals = locals;
                angular.copy(next.params, $routeParams);
              }
              $rootScope.$broadcast('$routeChangeSuccess', next, last);
            }
          }, function(error) {
            if (next == $route.current) {
              $rootScope.$broadcast('$routeChangeError', next, last, error);
            }
          });
      }
    }


    /**
     * @returns 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 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('');
    }
  }];
}