feat($sniffer): basic implementation of browser feature testing

This only extracts our 'hashchange' event and html5 history api detection from
$browser.

Closes #400

Rakefile

@@ -28,6 +28,7 @@ ANGULAR = [
   'src/service/resource.js',
   'src/service/route.js',
   'src/service/routeParams.js',
+  'src/service/sniffer.js',
   'src/service/window.js',
   'src/service/xhr.bulk.js',
   'src/service/xhr.cache.js',

jsTestDriver-coverage.conf

@@ -30,6 +30,7 @@ load:
   - src/service/log.js
   - src/service/resource.js
   - src/service/route.js
+  - src/service/sniffer.js
   - src/service/window.js
   - src/service/xhr.bulk.js
   - src/service/xhr.cache.js

jsTestDriver-jquery.conf

@@ -31,6 +31,7 @@ load:
   - src/service/resource.js
   - src/service/route.js
   - src/service/routeParams.js
+  - src/service/sniffer.js
   - src/service/window.js
   - src/service/xhr.bulk.js
   - src/service/xhr.cache.js

jsTestDriver-perf.conf

@@ -29,6 +29,7 @@ load:
   - src/service/resource.js
   - src/service/route.js
   - src/service/routeParams.js
+  - src/service/sniffer.js
   - src/service/window.js
   - src/service/xhr.bulk.js
   - src/service/xhr.cache.js

jsTestDriver.conf

@@ -31,6 +31,7 @@ load:
   - src/service/resource.js
   - src/service/route.js
   - src/service/routeParams.js
+  - src/service/sniffer.js
   - src/service/window.js
   - src/service/xhr.bulk.js
   - src/service/xhr.cache.js

src/AngularPublic.js

@@ -2,15 +2,14 @@
 
 var browserSingleton;
 
-angularService('$browser', function($log){
+angularService('$browser', function($log, $sniffer) {
   if (!browserSingleton) {
-    // TODO(vojta): inject $sniffer service when implemented
     browserSingleton = new Browser(window, jqLite(window.document), jqLite(window.document.body),
-                                   XHR, $log, {});
+                                   XHR, $log, $sniffer);
     browserSingleton.bind();
   }
   return browserSingleton;
-}, {$inject:['$log']});
+}, {$inject: ['$log', '$sniffer']});
 
 
 extend(angular, {

src/angular-bootstrap.js

@@ -115,6 +115,7 @@
              'service/resource.js',
              'service/route.js',
              'service/routeParams.js',
+             'service/sniffer.js',
              'service/window.js',
              'service/xhr.bulk.js',
              'service/xhr.cache.js',

src/service/sniffer.js

@@ -0,0 +1,24 @@
+'use strict';
+
+/**
+ * @workInProgress
+ * @ngdoc service
+ * @name angular.service.$sniffer
+ * @requires $window
+ *
+ * @property {boolean} history Does the browser support html5 history api ?
+ * @property {boolean} hashchange Does the browser support hashchange event ?
+ *
+ * @description
+ * This is very simple implementation of testing browser's features.
+ */
+angularServiceInject('$sniffer', function($window) {
+  if ($window.Modernizr) return $window.Modernizr;
+
+  return {
+    history: !!($window.history && $window.history.pushState),
+    hashchange: 'onhashchange' in $window &&
+                // IE8 compatible mode lies
+                (!$window.document.documentMode || $window.document.documentMode > 7)
+  };
+}, ['$window']);

test/service/snifferSpec.js

@@ -0,0 +1,38 @@
+'use strict';
+
+describe('$sniffer', function() {
+
+  function sniffer($window) {
+    return angular.service('$sniffer')($window);
+  }
+
+  describe('history', function() {
+    it('should be true if history.pushState defined', function() {
+      expect(sniffer({history: {pushState: noop, replaceState: noop}}).history).toBe(true);
+    });
+
+    it('should be false if history or pushState not defined', function() {
+      expect(sniffer({history: {}}).history).toBe(false);
+      expect(sniffer({}).history).toBe(false);
+    });
+  });
+
+  describe('hashchange', function() {
+    it('should be true if onhashchange property defined', function() {
+      expect(sniffer({onhashchange: true, document: {}}).hashchange).toBe(true);
+    });
+
+    it('should be false if onhashchange property not defined', function() {
+      expect(sniffer({document: {}}).hashchange).toBe(false);
+    });
+
+    it('should be false if documentMode is 7 (IE8 comp mode)', function() {
+      expect(sniffer({onhashchange: true, document: {documentMode: 7}}).hashchange).toBe(false);
+    });
+  });
+
+  it('should use Modernizr if defined', function() {
+    var Modernizr = {};
+    expect(sniffer({Modernizr: Modernizr})).toBe(Modernizr);
+  });
+});