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third_party/pkg/route_hierarchical/README.md

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-Route
-=====
-
-Route is a client routing library for Dart that helps make building
-single-page web apps.
-
-Installation
-------------
-
-Add this package to your pubspec.yaml file:
-
-    dependencies:
-      route_hierarchical: any
-
-Then, run `pub install` to download and link in the package.
-
-UrlMatcher
-----------
-Route is built around `UrlMatcher`, an interface that defines URL template
-parsing, matching and reversing.
-
-
-UrlTemplate
------------
-The default implementation of the `UrlMatcher` is `UrlTemplate`. As an example,
-consider a blog with a home page and an article page. The article URL has the
-form /article/1234. It can matched by the following template:
-`/article/:articleId`.
-
-Router
---------------
-
-Router is a stateful object that contains routes and can perform URL routing
-on those routes.
-
-The `Router` can listen to `Window.onPopState` (or fallback to
-Window.onHashChange in older browsers) events and invoke the correct
-handler so that the back button seamlessly works.
-
-Example (client.dart):
-
-```dart
-library client;
-
-import 'package:route_hierarchical/client.dart';
-
-main() {
-  var router = new Router();
-  router.root
-    ..addRoute(name: 'article', path: '/article/:articleId', enter: showArticle)
-    ..addRoute(name: 'home', defaultRoute: true, path: '/', enter: showHome);
-  router.listen();
-}
-
-void showHome(RouteEvent e) {
-  // nothing to parse from path, since there are no groups
-}
-
-void showArticle(RouteEvent e) {
-  var articleId = e.parameters['articleId'];
-  // show article page with loading indicator
-  // load article from server, then render article
-}
-```
-
-The client side router can let you define nested routes.
-
-```dart
-var router = new Router();
-router.root
-  ..addRoute(
-     name: 'usersList',
-     path: '/users',
-     defaultRoute: true,
-     enter: showUsersList)
-  ..addRoute(
-     name: 'user',
-     path: '/user/:userId',
-     mount: (router) =>
-       router
-         ..addDefaultRoute(
-             name: 'articleList',
-             path: '/acticles',
-             enter: showArticlesList)
-         ..addRoute(
-             name: 'article',
-             path: '/article/:articleId',
-             mount: (router) =>
-               router
-                 ..addDefaultRoute(
-                     name: 'view',
-                     path: '/view',
-                     enter: viewArticle)
-                 ..addRoute(
-                     name: 'edit',
-                     path: '/edit',
-                     enter: editArticle)))
-```
-
-The mount parameter takes either a function that accepts an instance of a new
-child router as the only parameter, or an instance of an object that implements
-Routable interface.
-
-```dart
-typedef void MountFn(Router router);
-```
-
-or
-
-```dart
-abstract class Routable {
-  void configureRoute(Route router);
-}
-```
-
-In either case, the child router is instantiated by the parent router an
-injected into the mount point, at which point child router can be configured
-with new routes.
-
-Routing with hierarchical router: when the parent router performs a prefix
-match on the URL, it removes the matched part from the URL and invokes the
-child router with the remaining tail.
-
-For instance, with the above example lets consider this URL: `/user/jsmith/article/1234`.
-Route "user" will match `/user/jsmith` and invoke the child router with `/article/1234`.
-Route "article" will match `/article/1234` and invoke the child router with ``.
-Route "view" will be matched as the default route.
-The resulting route path will be: `user -> article -> view`, or simply `user.article.view`
-
-Named Routes in Hierarchical Routers
-------------------------------------
-
-```dart
-router.go('usersList');
-router.go('user.articles', {'userId': 'jsmith'});
-router.go('user.article.view', {
-  'userId': 'jsmith',
-  'articleId', 1234}
-);
-router.go('user.article.edit', {
-  'userId': 'jsmith',
-  'articleId', 1234}
-);
-```
-
-If "go" is invoked on child routers, the router can automatically reconstruct
-and generate the new URL from the state in the parent routers.