--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit/mac/Misc/WebNSUserDefaultsExtras.m	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer. 
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "WebNSUserDefaultsExtras.h"
+
+#import "WebNSObjectExtras.h"
+#import <WebKitSystemInterface.h>
+#import <wtf/Assertions.h>
+
+@implementation NSString (WebNSUserDefaultsPrivate)
+
+- (NSString *)_webkit_HTTPStyleLanguageCode
+{
+    // Look up the language code using CFBundle.
+    NSString *languageCode = self;
+    NSString *preferredLanguageCode = WebCFAutorelease(WKCopyCFLocalizationPreferredName((CFStringRef)self));
+
+    if (preferredLanguageCode)
+        languageCode = preferredLanguageCode;
+    
+    // Make the string lowercase.
+    NSString *lowercaseLanguageCode = [languageCode lowercaseString];
+    
+    // Turn a '_' into a '-' if it appears after a 2-letter language code.
+    if ([lowercaseLanguageCode length] < 3 || [lowercaseLanguageCode characterAtIndex:2] != '_') {
+        return lowercaseLanguageCode;
+    }
+    NSMutableString *result = [lowercaseLanguageCode mutableCopy];
+    [result replaceCharactersInRange:NSMakeRange(2, 1) withString:@"-"];
+    return [result autorelease];
+}
+
+@end
+
+@implementation NSUserDefaults (WebNSUserDefaultsExtras)
+
+static NSString *preferredLanguageCode = nil;
+static NSLock *preferredLanguageLock = nil;
+static pthread_once_t preferredLanguageLockOnce = PTHREAD_ONCE_INIT;
+static pthread_once_t addDefaultsChangeObserverOnce = PTHREAD_ONCE_INIT;
+
+static void makeLock(void)
+{
+    preferredLanguageLock = [[NSLock alloc] init]; 
+}
+
++ (void)_webkit_ensureAndLockPreferredLanguageLock
+{
+    pthread_once(&preferredLanguageLockOnce, makeLock);
+    [preferredLanguageLock lock];
+}
+
++ (void)_webkit_defaultsDidChange
+{
+    [self _webkit_ensureAndLockPreferredLanguageLock];
+
+    [preferredLanguageCode release];
+    preferredLanguageCode = nil;
+
+    [preferredLanguageLock unlock];
+}
+
+static void addDefaultsChangeObserver(void)
+{
+    [[NSNotificationCenter defaultCenter] addObserver:[NSUserDefaults class]
+                                             selector:@selector(_webkit_defaultsDidChange)
+                                                 name:NSUserDefaultsDidChangeNotification
+                                               object:[NSUserDefaults standardUserDefaults]];
+}
+
++ (void)_webkit_addDefaultsChangeObserver
+{
+    pthread_once(&addDefaultsChangeObserverOnce, addDefaultsChangeObserver);
+}
+
++ (NSString *)_webkit_preferredLanguageCode
+{
+    // Get this outside the lock since it might block on the defaults lock, while we are inside registerDefaults:.
+    NSUserDefaults *standardDefaults = [self standardUserDefaults];
+
+    BOOL addObserver = NO;
+
+    [self _webkit_ensureAndLockPreferredLanguageLock];
+
+    if (!preferredLanguageCode) {
+        NSArray *languages = [standardDefaults stringArrayForKey:@"AppleLanguages"];
+        if ([languages count] == 0) {
+            preferredLanguageCode = [@"en" retain];
+        } else {
+            preferredLanguageCode = [[[languages objectAtIndex:0] _webkit_HTTPStyleLanguageCode] copy];
+        }
+        addObserver = YES;
+    }
+
+    NSString *code = [[preferredLanguageCode retain] autorelease];
+    
+    [preferredLanguageLock unlock];
+
+    if (addObserver) {
+        [self _webkit_addDefaultsChangeObserver];
+    }
+
+    return code;
+}
+
+@end