feat(angular_1_router): add ngRouteShim module

btford · btford · commit aed34e1f8219 · 2015-09-21T12:13:07.000-07:00
This module attempts to provide a shim for `$routeProvider` to aid in migrating from ngRoute to Component Router. Closes #4266
diff --git a/modules/angular1_router/karma-router.conf.js b/modules/angular1_router/karma-router.conf.js
@@ -14,6 +14,7 @@ module.exports = function (config) {
       '../../node_modules/angular-mocks/angular-mocks.js',
 
       '../../dist/angular_1_router.js',
+      'src/ng_route_shim.js',
 
       'test/*.es5.js',
       'test/**/*_spec.js'
diff --git a/modules/angular1_router/src/ng_route_shim.js b/modules/angular1_router/src/ng_route_shim.js
@@ -0,0 +1,349 @@
+/** @license Copyright 2014-2015 Google, Inc. http://github.com/angular/angular/LICENSE */
+(function () {
+
+  'use strict';
+
+  // keep a reference to compileProvider so we can register new component-directives
+  // on-the-fly based on $routeProvider configuration
+  // TODO: remove this– right now you can only bootstrap one Angular app with this hack
+  var $compileProvider, $q, $injector;
+
+  /**
+   * This module loads services that mimic ngRoute's configuration, and includes
+   * an anchor link directive that intercepts clicks to routing.
+   *
+   * This module is intended to be used as a stop-gap solution for projects upgrading from ngRoute.
+   * It intentionally does not implement all features of ngRoute.
+   */
+  angular.module('ngRouteShim', [])
+    .provider('$route', $RouteProvider)
+    .config(['$compileProvider', function (compileProvider) {
+      $compileProvider = compileProvider;
+    }])
+    .factory('$routeParams', $routeParamsFactory)
+    .directive('a', anchorLinkDirective)
+
+    // Connects the legacy $routeProvider config shim to Component Router's config.
+    .run(['$route', '$router', function ($route, $router) {
+      $route.$$subscribe(function (routeDefinition) {
+        if (!angular.isArray(routeDefinition)) {
+          routeDefinition = [routeDefinition];
+        }
+        $router.config(routeDefinition);
+      });
+    }]);
+
+
+  /**
+   * A shimmed out provider that provides the same API as ngRoute's $routeProvider, but uses these calls
+   * to configure Component Router.
+   */
+  function $RouteProvider() {
+
+    var routes = [];
+    var subscriptionFn = null;
+
+    var routeMap = {};
+
+    // Stats for which routes are skipped
+    var skipCount = 0;
+    var successCount = 0;
+    var allCount = 0;
+
+    function consoleMetrics() {
+      return '(' + skipCount + ' skipped / ' + successCount + ' success / ' + allCount + ' total)';
+    }
+
+
+    /**
+     * @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.
+     *
+     * @param {Object} route Mapping information to be assigned to `$route.current` on route
+     *    match.
+     */
+    this.when = function(path, route) {
+      //copy original route object to preserve params inherited from proto chain
+      var routeCopy = angular.copy(route);
+
+      allCount++;
+
+      if (angular.isDefined(routeCopy.reloadOnSearch)) {
+        console.warn('Route for "' + path + '" uses "reloadOnSearch" which is not implemented.');
+      }
+      if (angular.isDefined(routeCopy.caseInsensitiveMatch)) {
+        console.warn('Route for "' + path + '" uses "caseInsensitiveMatch" which is not implemented.');
+      }
+
+      // use new wildcard format
+      path = reformatWildcardParams(path);
+
+      if (path[path.length - 1] == '*') {
+        skipCount++;
+        console.warn('Route for "' + path + '" ignored because it ends with *. Skipping.', consoleMetrics());
+        return this;
+      }
+
+      if (path.indexOf('?') > -1) {
+        skipCount++;
+        console.warn('Route for "' + path + '" ignored because it has optional parameters. Skipping.', consoleMetrics());
+        return this;
+      }
+
+      if (typeof route.redirectTo == 'function') {
+        skipCount++;
+        console.warn('Route for "' + path + '" ignored because lazy redirecting to a function is not yet implemented. Skipping.', consoleMetrics());
+        return this;
+      }
+
+
+      var routeDefinition = {
+        path: path,
+        data: routeCopy
+      };
+
+      routeMap[path] = routeCopy;
+
+      if (route.redirectTo) {
+        routeDefinition.redirectTo = route.redirectTo;
+      } else {
+        if (routeCopy.controller && !routeCopy.controllerAs) {
+          console.warn('Route for "' + path + '" should use "controllerAs".');
+        }
+
+        var directiveName = routeObjToRouteName(routeCopy, path);
+
+        if (!directiveName) {
+          throw new Error('Could not determine a name for route "' + path + '".');
+        }
+
+        routeDefinition.component = directiveName;
+        routeDefinition.as = upperCase(directiveName);
+
+        var directiveController = routeCopy.controller;
+
+        var directiveDefinition = {
+          scope: false,
+          controller: directiveController,
+          controllerAs: routeCopy.controllerAs,
+          templateUrl: routeCopy.templateUrl,
+          template: routeCopy.template
+        };
+
+        var directiveFactory = function () {
+          return directiveDefinition;
+        };
+
+        // if we have route resolve options, prepare a wrapper controller
+        if (directiveController && routeCopy.resolve) {
+          var originalController = directiveController;
+          var resolvedLocals = {};
+
+          directiveDefinition.controller = ['$injector', '$scope', function ($injector, $scope) {
+            var locals = angular.extend({
+              $scope: $scope
+            }, resolvedLocals);
+
+            var ctrl = $injector.instantiate(originalController, locals);
+
+            if (routeCopy.controllerAs) {
+              locals.$scope[routeCopy.controllerAs] = ctrl;
+            }
+
+            return ctrl;
+          }];
+
+          // we take care of controllerAs in the directive controller wrapper
+          delete directiveDefinition.controllerAs;
+
+          // we resolve the locals in a canActivate block
+          directiveFactory.$canActivate = function() {
+            var locals = angular.extend({}, routeCopy.resolve);
+
+            angular.forEach(locals, function(value, key) {
+              locals[key] = angular.isString(value) ?
+                $injector.get(value) : $injector.invoke(value, null, null, key);
+            });
+
+            return $q.all(locals).then(function (locals) {
+              resolvedLocals = locals;
+            }).then(function () {
+              return true;
+            });
+          };
+        }
+
+        // register the dynamically created directive
+        $compileProvider.directive(directiveName, directiveFactory);
+      }
+      if (subscriptionFn) {
+        subscriptionFn(routeDefinition);
+      } else {
+        routes.push(routeDefinition);
+      }
+      successCount++;
+
+      return this;
+    };
+
+    this.otherwise = function(params) {
+      if (typeof params === 'string') {
+        params = {redirectTo: params};
+      }
+      this.when('/*rest', params);
+      return this;
+    };
+
+
+    this.$get = ['$q', '$injector', function (q, injector) {
+      $q = q;
+      $injector = injector;
+
+      var $route = {
+        routes: routeMap,
+
+        /**
+         * @ngdoc method
+         * @name $route#reload
+         *
+         * @description
+         * Causes `$route` service to reload the current route even if
+         * {@link ng.$location $location} hasn't changed.
+         */
+        reload: function() {
+          throw new Error('Not implemented: $route.reload');
+        },
+
+        /**
+         * @ngdoc method
+         * @name $route#updateParams
+         */
+        updateParams: function(newParams) {
+          throw new Error('Not implemented: $route.updateParams');
+        },
+
+        /**
+         * Runs the given `fn` whenever new configs are added.
+         * Only one subscription is allowed.
+         * Passed `fn` is called synchronously.
+         */
+        $$subscribe: function(fn) {
+          if (subscriptionFn) {
+            throw new Error('only one subscription allowed');
+          }
+          subscriptionFn = fn;
+          subscriptionFn(routes);
+          routes = [];
+        },
+
+        /**
+         * Runs a string with stats about many route configs were adapted, and how many were
+         * dropped because they are incompatible.
+         */
+        $$getStats: consoleMetrics
+      };
+
+      return $route;
+    }];
+
+  }
+
+  function $routeParamsFactory($router, $rootScope) {
+    // the identity of this object cannot change
+    var paramsObj = {};
+
+    $rootScope.$on('$routeChangeSuccess', function () {
+      var newParams = $router._currentInstruction && $router._currentInstruction.component.params;
+
+      angular.forEach(paramsObj, function (val, name) {
+        delete paramsObj[name];
+      });
+      angular.forEach(newParams, function (val, name) {
+        paramsObj[name] = val;
+      });
+    });
+
+    return paramsObj;
+  }
+
+  /**
+   * Allows normal anchor links to kick off routing.
+   */
+  function anchorLinkDirective($router) {
+    return {
+      restrict: 'E',
+      link: function (scope, element) {
+        // If the linked element is not an anchor tag anymore, do nothing
+        if (element[0].nodeName.toLowerCase() !== 'a') {
+          return;
+        }
+
+        // SVGAElement does not use the href attribute, but rather the 'xlinkHref' attribute.
+        var hrefAttrName = Object.prototype.toString.call(element.prop('href')) === '[object SVGAnimatedString]' ?
+          'xlink:href' : 'href';
+
+        element.on('click', function (event) {
+          if (event.which !== 1) {
+            return;
+          }
+
+          var href = element.attr(hrefAttrName);
+          if (href && $router.recognize(href)) {
+            $router.navigateByUrl(href);
+            event.preventDefault();
+          }
+        });
+      }
+    };
+  }
+
+  /**
+   * Given a route object, attempts to find a unique directive name.
+   *
+   * @param route – route config object passed to $routeProvider.when
+   * @param path – route configuration path
+   * @returns {string|name} – a normalized (camelCase) directive name
+   */
+  function routeObjToRouteName(route, path) {
+    var name = route.controllerAs;
+
+    var controller = route.controller;
+    if (!name && controller) {
+      if (angular.isArray(controller)) {
+        controller = controller[controller.length - 1];
+      }
+      name = controller.name;
+    }
+
+    if (!name) {
+      var segments = path.split('/');
+      name = segments[segments.length - 1];
+    }
+
+    if (name) {
+      name = name + 'AutoCmp';
+    }
+
+    return name;
+  }
+
+  function upperCase(str) {
+    return str.charAt(0).toUpperCase() + str.substr(1);
+  }
+
+  /*
+   * Changes "/:foo*" to "/*foo"
+   */
+  var WILDCARD_PARAM_RE = new RegExp('\\/:([a-z0-9]+)\\*', 'gi');
+  function reformatWildcardParams(path) {
+    return path.replace(WILDCARD_PARAM_RE, function (m, m1) {
+      return '/*' + m1;
+    });
+  }
+
+}());
diff --git a/modules/angular1_router/test/integration/shim_spec.js b/modules/angular1_router/test/integration/shim_spec.js
