In Browser Path Matching with Javascript

When debugging routes ,it can sometimes be difficult to understand exactly how the paths are matched. This PR adds a JS based path matching widget to the `/rails/info/routes` output. You can enter in a path, and it will tell you which of the routes that path matches, while preserving order (top match wins).

The matching widget in action:

![](http://f.cl.ly/items/3A2F0v2m3m1Z1p3P3O3k/path-match.gif)

Prior to this PR the only way to check matching paths is via mental math, or typing in a path in the url bar and seeing where it goes. This feature will be an invaluable debugging tool by dramatically decreasing the time needed to check a path match. 

ATP actionpack

1 files changed, 8 insertions, 0 deletions

diff --git a/actionpack/test/dispatch/routing/inspector_test.rb b/actionpack/test/dispatch/routing/inspector_test.rb
index c7dcb5a683..55221f87c4 100644
--- a/actionpack/test/dispatch/routing/inspector_test.rb
+++ b/actionpack/test/dispatch/routing/inspector_test.rb
@@ -21,6 +21,14 @@ module ActionDispatch
         inspector.format(ActionDispatch::Routing::ConsoleFormatter.new, options[:filter]).split("\n")
       end
 
+      def test_json_regexp_converter
+        @set.draw do
+          get '/cart', :to => 'cart#show'
+        end
+        route = ActionDispatch::Routing::RouteWrapper.new(@set.routes.first)
+        assert_equal "^\\/cart(?:\\.([^\\/.?]+))?$", route.json_regexp
+      end
+
       def test_displaying_routes_for_engines
         engine = Class.new(Rails::Engine) do
           def self.inspect