Added req.acceptedLanguages

lib/request.js

@@ -173,6 +173,30 @@ req.__defineGetter__('accepted', function(){
     : [];
 });
 
+/**
+ * Return an array of Accepted languages
+ * ordered from highest quality to lowest.
+ *
+ * Examples:
+ *
+ *     Accept-Language: en;q=.5, en-us
+ *     ['en-us', 'en']
+ *
+ * @return {Array}
+ * @api public
+ */
+
+req.__defineGetter__('acceptedLanguages', function(){
+  var accept = this.header('Accept-Language');
+  return accept
+    ? utils
+      .parseQuality(accept)
+      .map(function(obj){
+        return obj.value;
+      })
+    : [];
+});
+
 /**
  * Return the value of param `name` when present or `defaultValue`.
  *

test/req.accepted.js

@@ -4,7 +4,7 @@ var express = require('../')
 
 describe('req', function(){
   describe('.accepted', function(){
-    it('should return an array of accepted content-types', function(done){
+    it('should return an array of accepted media types', function(done){
       var app = express();
 
       app.use(function(req, res){

test/req.acceptedLanguages.js

@@ -0,0 +1,37 @@
+
+var express = require('../')
+  , request = require('./support/http');
+
+describe('req', function(){
+  describe('.acceptedLanguages', function(){
+    it('should return an array of accepted languages', function(done){
+      var app = express();
+
+      app.use(function(req, res){
+        req.acceptedLanguages[0].should.equal('en-us');
+        req.acceptedLanguages[1].should.equal('en');
+        res.end();
+      });
+
+      request(app)
+      .get('/')
+      .set('Accept-Language', 'en;q=.5, en-us')
+      .expect(200, done);
+    })
+
+    describe('when Accept-Language is not present', function(){
+      it('should default to []', function(done){
+        var app = express();
+
+        app.use(function(req, res){
+          req.acceptedLanguages.should.have.length(0);
+          res.end();
+        });
+
+        request(app)
+        .get('/')
+        .expect(200, done);
+      })
+    })
+  })
+})