Source/WebCore/platform/text/cf/HyphenationCF.cpp

/*
 * Copyright (C) 2010 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include "config.h"
#include "Hyphenation.h"

#include <wtf/Language.h>
#include <wtf/RetainPtr.h>
#include <wtf/TinyLRUCache.h>
#include <wtf/text/StringView.h>
#include <wtf/text/TextBreakIteratorInternalICU.h>

namespace WTF {

template<>
class TinyLRUCachePolicy<AtomString, RetainPtr<CFLocaleRef>>
{
public:
    static TinyLRUCache<AtomString, RetainPtr<CFLocaleRef>>& cache()
    {
        static NeverDestroyed<TinyLRUCache<AtomString, RetainPtr<CFLocaleRef>>> cache;
        return cache;
    }

    static bool isKeyNull(const AtomString& localeIdentifier)
    {
        return localeIdentifier.isNull();
    }

    static RetainPtr<CFLocaleRef> createValueForNullKey()
    {
        // CF hyphenation functions use locale (regional formats) language, which doesn't necessarily match primary UI language,
        // so we can't use default locale here. See <rdar://problem/14897664>.
        RetainPtr<CFLocaleRef> locale = adoptCF(CFLocaleCreate(kCFAllocatorDefault, defaultLanguage().createCFString().get()));
        return CFStringIsHyphenationAvailableForLocale(locale.get()) ? locale : nullptr;
    }

    static RetainPtr<CFLocaleRef> createValueForKey(const AtomString& localeIdentifier)
    {
        RetainPtr<CFLocaleRef> locale = adoptCF(CFLocaleCreate(kCFAllocatorDefault, localeIdentifier.string().createCFString().get()));

        return CFStringIsHyphenationAvailableForLocale(locale.get()) ? locale : nullptr;
    }
};
}

namespace WebCore {

bool canHyphenate(const AtomString& localeIdentifier)
{
    return TinyLRUCachePolicy<AtomString, RetainPtr<CFLocaleRef>>::cache().get(localeIdentifier);
}

size_t lastHyphenLocation(StringView text, size_t beforeIndex, const AtomString& localeIdentifier)
{
    RetainPtr<CFLocaleRef> locale = TinyLRUCachePolicy<AtomString, RetainPtr<CFLocaleRef>>::cache().get(localeIdentifier);

    CFOptionFlags searchAcrossWordBoundaries = 1;
    CFIndex result = CFStringGetHyphenationLocationBeforeIndex(text.createCFStringWithoutCopying().get(), beforeIndex, CFRangeMake(0, text.length()), searchAcrossWordBoundaries, locale.get(), nullptr);
    return result == kCFNotFound ? 0 : result;
}

} // namespace WebCore