1/*
2 * Copyright (C) 2003, 2005, 2006, 2010 Apple 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 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#import "config.h"
27#import "Language.h"
28
29#import "BlockExceptions.h"
30#import "WebCoreSystemInterface.h"
31#import <wtf/Assertions.h>
32#import <wtf/MainThread.h>
33#import <wtf/text/WTFString.h>
34
35using namespace WebCore;
36
37static NSString *preferredLanguageCode;
38
39@interface LanguageChangeObserver : NSObject {
40}
41@end
42
43@implementation LanguageChangeObserver
44
45+ (void)_webkit_languagePreferencesDidChange
46{
47    ASSERT(isMainThread());
48
49    [preferredLanguageCode release];
50    preferredLanguageCode = nil;
51
52    languageDidChange();
53}
54
55@end
56
57namespace WebCore {
58
59static NSString *createHTTPStyleLanguageCode(NSString *languageCode)
60{
61    ASSERT(isMainThread());
62
63    // Look up the language code using CFBundle.
64    CFStringRef preferredLanguageCode = wkCopyCFLocalizationPreferredName((CFStringRef)languageCode);
65
66    if (preferredLanguageCode)
67        languageCode = (NSString *)preferredLanguageCode;
68
69    // Make the string lowercase.
70    NSString *lowercaseLanguageCode = [languageCode lowercaseString];
71
72    NSString *httpStyleLanguageCode;
73
74    // Turn a '_' into a '-' if it appears after a 2-letter language code.
75    if ([lowercaseLanguageCode length] >= 3 && [lowercaseLanguageCode characterAtIndex:2] == '_') {
76        NSMutableString *mutableLanguageCode = [lowercaseLanguageCode mutableCopy];
77        [mutableLanguageCode replaceCharactersInRange:NSMakeRange(2, 1) withString:@"-"];
78        httpStyleLanguageCode = mutableLanguageCode;
79    } else
80        httpStyleLanguageCode = [lowercaseLanguageCode retain];
81
82    if (preferredLanguageCode)
83        CFRelease(preferredLanguageCode);
84
85    return httpStyleLanguageCode;
86}
87
88String platformDefaultLanguage()
89{
90    ASSERT(isMainThread());
91
92    BEGIN_BLOCK_OBJC_EXCEPTIONS;
93
94    if (!preferredLanguageCode) {
95        [[NSUserDefaults standardUserDefaults] synchronize];
96        NSArray *languages = [[NSUserDefaults standardUserDefaults] stringArrayForKey:@"AppleLanguages"];
97        if (![languages count])
98            preferredLanguageCode = @"en";
99        else
100            preferredLanguageCode = createHTTPStyleLanguageCode([languages objectAtIndex:0]);
101    }
102
103    NSString *code = [[preferredLanguageCode retain] autorelease];
104
105    static bool languageChangeObserverAdded;
106    if (!languageChangeObserverAdded) {
107        [[NSDistributedNotificationCenter defaultCenter] addObserver:[LanguageChangeObserver self]
108                                                            selector:@selector(_webkit_languagePreferencesDidChange)
109                                                                name:@"AppleLanguagePreferencesChangedNotification"
110                                                              object:nil];
111        languageChangeObserverAdded = true;
112    }
113
114    return code;
115
116    END_BLOCK_OBJC_EXCEPTIONS;
117    return String();
118}
119
120}
121