feat($route): add caseInsensitiveMatch option for url matching

with this property urls can be matched case-insensitively which
enables some new use cases.

src/ng/route.js

@@ -92,13 +92,18 @@ function $RouteProvider(){
    *      If the option is set to `false` and url in the browser changes, then
    *      `$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] = extend({reloadOnSearch: true}, route);
+    routes[path] = extend({reloadOnSearch: true, caseInsensitiveMatch: false}, route);
 
     // create redirection for trailing slashes
     if (path) {
@@ -343,14 +348,16 @@ function $RouteProvider(){
     /**
      * @param on {string} current url
      * @param when {string} route when template to match the url against
+     * @param whenProperties {Object} properties to define when's matching behavior
      * @return {?Object}
      */
-    function switchRouteMatcher(on, when) {
+    function switchRouteMatcher(on, when, whenProperties) {
       // TODO(i): this code is convoluted and inefficient, we should construct the route matching
       //   regex only once and then reuse it
 
       // Escape regexp special characters.
       when = '^' + when.replace(/[-\/\\^$:*+?.()|[\]{}]/g, "\\$&") + '$';
+
       var regex = '',
           params = [],
           dst = {};
@@ -377,7 +384,7 @@ function $RouteProvider(){
       // Append trailing path part.
       regex += when.substr(lastMatchedIndex);
 
-      var match = on.match(new RegExp(regex));
+      var match = on.match(new RegExp(regex, whenProperties.caseInsensitiveMatch ? 'i' : ''));
       if (match) {
         forEach(params, function(name, index) {
           dst[name] = match[index + 1];
@@ -466,7 +473,7 @@ function $RouteProvider(){
       // Match a route
       var params, match;
       forEach(routes, function(route, path) {
-        if (!match && (params = switchRouteMatcher($location.path(), path))) {
+        if (!match && (params = switchRouteMatcher($location.path(), path, route))) {
           match = inherit(route, {
             params: extend({}, $location.search(), params),
             pathParams: params});

test/ng/routeSpec.js

@@ -117,6 +117,72 @@ describe('$route', function() {
     });
   });
 
+
+  it('should route and fire change event correctly whenever the case insensitive flag is utilized', function() {
+    var log = '',
+        lastRoute,
+        nextRoute;
+
+    module(function($routeProvider) {
+      $routeProvider.when('/Book1/:book/Chapter/:chapter/*highlight/edit',
+          {controller: noop, templateUrl: 'Chapter.html', caseInsensitiveMatch: true});
+      $routeProvider.when('/Book2/:book/*highlight/Chapter/:chapter',
+          {controller: noop, templateUrl: 'Chapter.html'});
+      $routeProvider.when('/Blank', {});
+    });
+    inject(function($route, $location, $rootScope) {
+      $rootScope.$on('$routeChangeStart', function(event, next, current) {
+        log += 'before();';
+        expect(current).toBe($route.current);
+        lastRoute = current;
+        nextRoute = next;
+      });
+      $rootScope.$on('$routeChangeSuccess', function(event, current, last) {
+        log += 'after();';
+        expect(current).toBe($route.current);
+        expect(lastRoute).toBe(last);
+        expect(nextRoute).toBe(current);
+      });
+
+      $location.path('/Book1/Moby/Chapter/Intro/one/edit').search('p=123');
+      $rootScope.$digest();
+      $httpBackend.flush();
+      expect(log).toEqual('before();after();');
+      expect($route.current.params).toEqual({book:'Moby', chapter:'Intro', highlight:'one', p:'123'});
+
+      log = '';
+      $location.path('/BOOK1/Moby/CHAPTER/Intro/one/EDIT').search('p=123');
+      $rootScope.$digest();
+      expect(log).toEqual('before();after();');
+      expect($route.current.params).toEqual({book:'Moby', chapter:'Intro', highlight:'one', p:'123'});
+
+      log = '';
+      $location.path('/Blank').search('ignore');
+      $rootScope.$digest();
+      expect(log).toEqual('before();after();');
+      expect($route.current.params).toEqual({ignore:true});
+
+      log = '';
+      $location.path('/BLANK');
+      $rootScope.$digest();
+      expect(log).toEqual('before();after();');
+      expect($route.current).toEqual(null);
+
+      log = '';
+      $location.path('/Book2/Moby/one/two/Chapter/Intro').search('p=123');
+      $rootScope.$digest();
+      expect(log).toEqual('before();after();');
+      expect($route.current.params).toEqual({book:'Moby', chapter:'Intro', highlight:'one/two', p:'123'});
+
+      log = '';
+      $location.path('/BOOK2/Moby/one/two/CHAPTER/Intro').search('p=123');
+      $rootScope.$digest();
+      expect(log).toEqual('before();after();');
+      expect($route.current).toEqual(null);
+    });
+  });
+
+
   it('should not change route when location is canceled', function() {
     module(function($routeProvider) {
       $routeProvider.when('/somePath', {template: 'some path'});