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1/*
2 * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#import "WebNSUserDefaultsExtras.h"
30
31#import "WebNSObjectExtras.h"
32#import <WebKitSystemInterface.h>
33#import <wtf/Assertions.h>
34
35@implementation NSString (WebNSUserDefaultsPrivate)
36
37- (NSString *)_webkit_HTTPStyleLanguageCode
38{
39    // Look up the language code using CFBundle.
40    NSString *languageCode = self;
41    NSString *preferredLanguageCode = WebCFAutorelease(WKCopyCFLocalizationPreferredName((CFStringRef)self));
42
43    if (preferredLanguageCode)
44        languageCode = preferredLanguageCode;
45
46    // Make the string lowercase.
47    NSString *lowercaseLanguageCode = [languageCode lowercaseString];
48
49    // Turn a '_' into a '-' if it appears after a 2-letter language code.
50    if ([lowercaseLanguageCode length] < 3 || [lowercaseLanguageCode characterAtIndex:2] != '_') {
51        return lowercaseLanguageCode;
52    }
53    NSMutableString *result = [lowercaseLanguageCode mutableCopy];
54    [result replaceCharactersInRange:NSMakeRange(2, 1) withString:@"-"];
55    return [result autorelease];
56}
57
58@end
59
60@implementation NSUserDefaults (WebNSUserDefaultsExtras)
61
62static NSString *preferredLanguageCode = nil;
63static NSLock *preferredLanguageLock = nil;
64static pthread_once_t preferredLanguageLockOnce = PTHREAD_ONCE_INIT;
65static pthread_once_t addDefaultsChangeObserverOnce = PTHREAD_ONCE_INIT;
66
67static void makeLock(void)
68{
69    preferredLanguageLock = [[NSLock alloc] init];
70}
71
72+ (void)_webkit_ensureAndLockPreferredLanguageLock
73{
74    pthread_once(&preferredLanguageLockOnce, makeLock);
75    [preferredLanguageLock lock];
76}
77
78+ (void)_webkit_defaultsDidChange
79{
80    [self _webkit_ensureAndLockPreferredLanguageLock];
81
82    [preferredLanguageCode release];
83    preferredLanguageCode = nil;
84
85    [preferredLanguageLock unlock];
86}
87
88static void addDefaultsChangeObserver(void)
89{
90    [[NSNotificationCenter defaultCenter] addObserver:[NSUserDefaults class]
91                                             selector:@selector(_webkit_defaultsDidChange)
92                                                 name:NSUserDefaultsDidChangeNotification
93                                               object:[NSUserDefaults standardUserDefaults]];
94}
95
96+ (void)_webkit_addDefaultsChangeObserver
97{
98    pthread_once(&addDefaultsChangeObserverOnce, addDefaultsChangeObserver);
99}
100
101+ (NSString *)_webkit_preferredLanguageCode
102{
103    // Get this outside the lock since it might block on the defaults lock, while we are inside registerDefaults:.
104    NSUserDefaults *standardDefaults = [self standardUserDefaults];
105
106    BOOL addObserver = NO;
107
108    [self _webkit_ensureAndLockPreferredLanguageLock];
109
110    if (!preferredLanguageCode) {
111        NSArray *languages = [standardDefaults stringArrayForKey:@"AppleLanguages"];
112        if ([languages count] == 0) {
113            preferredLanguageCode = [@"en" retain];
114        } else {
115            preferredLanguageCode = [[[languages objectAtIndex:0] _webkit_HTTPStyleLanguageCode] copy];
116        }
117        addObserver = YES;
118    }
119
120    NSString *code = [[preferredLanguageCode retain] autorelease];
121
122    [preferredLanguageLock unlock];
123
124    if (addObserver) {
125        [self _webkit_addDefaultsChangeObserver];
126    }
127
128    return code;
129}
130
131@end
132