Implement navigator.languages.

Source/core/frame/Navigator.cpp

Index: Source/core/frame/Navigator.cpp
diff --git a/Source/core/frame/Navigator.cpp b/Source/core/frame/Navigator.cpp
index cae5b5bde8454b00e27bf973d44e784f8e6b84e8..08059baa407eec424127b85e2eee6d702785f049 100644
--- a/Source/core/frame/Navigator.cpp
+++ b/Source/core/frame/Navigator.cpp
@@ -25,13 +25,17 @@
 
 #include "bindings/v8/ScriptController.h"
 #include "core/dom/Document.h"
+#include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/NavigatorID.h"
 #include "core/frame/Settings.h"
 #include "core/loader/CookieJar.h"
 #include "core/loader/FrameLoader.h"
+#include "core/page/Chrome.h"
+#include "core/page/ChromeClient.h"
 #include "core/plugins/DOMMimeTypeArray.h"
 #include "core/plugins/DOMPluginArray.h"
+#include "platform/Language.h"
 
 #ifndef WEBCORE_NAVIGATOR_PRODUCT_SUB
 #define WEBCORE_NAVIGATOR_PRODUCT_SUB "20030107"
@@ -123,6 +127,31 @@ void Navigator::getStorageUpdates()
     // FIXME: Remove this method or rename to yieldForStorageUpdates.
 }
 
+Vector<String> Navigator::languages()
+{
+    Vector<String> languages;
+
+    if (!m_frame || !m_frame->host()) {
+        languages.append(defaultLanguage());
+        return languages;
+    }
+
+    String acceptLanguages = m_frame->host()->chrome().client().acceptLanguages();
+    acceptLanguages.split(",", languages);
+
+    // Sanitizing tokens. We could do that more extensively but we should assume
+    // that the accept languages are already sane and support BCP47. It is
+    // likely a waste of time to make sure the tokens matches that spec here.
+    for (size_t i = 0; i < languages.size(); ++i) {
+        String& token = languages[i];
+        token = token.stripWhiteSpace();
+        if (token.length() >= 3 && token[2] == '_')
+            token.replace(2, 1, "-");
+    }
+
+    return languages;
+}
+
 void Navigator::trace(Visitor* visitor)
 {
     visitor->trace(m_plugins);