Source/WebCore/platform/text/ios/TextEncodingRegistryIOS.mm

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
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 *
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#import "config.h"
#import "TextEncodingRegistry.h"

#if PLATFORM(IOS_FAMILY)

namespace WebCore {

CFStringEncoding webDefaultCFStringEncoding()
{
    // FIXME: we can do better than this hard-coded list once this radar is addressed:
    // <rdar://problem/4433165> Need API that can get preferred web (and mail) encoding(s) w/o region code.
    // Alternatively, we could have our own table of preferred encodings in WebKit, shared with Mac.

    NSArray *preferredLanguages = [NSLocale preferredLanguages];
    if (!preferredLanguages.count)
        return kCFStringEncodingISOLatin1;

    // We pass in the first language as "en" because if preferredLocalizationsFromArray:forPreferences:
    // doesn't find a match, it will return the result of the first value in languagesWithCustomDefaultEncodings.
    // We could really pass anything as this first value, as long as it's not something we're trying to match against
    // below. We don't want to implictly default to "zh-Hans", that's why it's not first in the array.
    NSArray *languagesWithCustomDefaultEncodings = @[ @"en", @"zh-Hans", @"zh-Hant", @"zh-HK", @"ja", @"ko", @"ru" ];
    NSArray *languagesToUse = [NSBundle preferredLocalizationsFromArray:languagesWithCustomDefaultEncodings forPreferences:@[ [preferredLanguages firstObject] ]];
    if (!languagesToUse.count)
        return kCFStringEncodingISOLatin1;

    NSString *firstLanguage = languagesToUse.firstObject;
    if ([firstLanguage isEqualToString:@"zh-Hans"])
        return kCFStringEncodingEUC_CN;
    if ([firstLanguage isEqualToString:@"zh-Hant"])
        return kCFStringEncodingBig5;
    if ([firstLanguage isEqualToString:@"zh-HK"])
        return kCFStringEncodingBig5_HKSCS_1999;
    if ([firstLanguage isEqualToString:@"ja"])
        return kCFStringEncodingShiftJIS;
    if ([firstLanguage isEqualToString:@"ko"])
        return kCFStringEncodingEUC_KR;
    if ([firstLanguage isEqualToString:@"ru"])
        return kCFStringEncodingWindowsCyrillic;

    return kCFStringEncodingISOLatin1;
}

} // namespace WebCore

#endif // PLATFORM(IOS_FAMILY)