Source/JavaScriptCore/runtime/IntlCache.h

/*
 * Copyright (C) 2020 Apple 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.
 *
 * 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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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#pragma once

#include <unicode/udatpg.h>
#include <wtf/Noncopyable.h>
#include <wtf/text/CString.h>
#include <wtf/unicode/icu/ICUHelpers.h>

namespace JSC {

class IntlCache {
    WTF_MAKE_NONCOPYABLE(IntlCache);
    WTF_MAKE_FAST_ALLOCATED;
public:
    IntlCache() = default;

    Vector<UChar, 32> getBestDateTimePattern(const CString& locale, const UChar* skeleton, unsigned skeletonSize, UErrorCode&);
    Vector<UChar, 32> getFieldDisplayName(const CString& locale, UDateTimePatternField, UDateTimePGDisplayWidth, UErrorCode&);

private:
    UDateTimePatternGenerator* getSharedPatternGenerator(const CString& locale, UErrorCode& status)
    {
        if (m_cachedDateTimePatternGenerator) {
            if (locale == m_cachedDateTimePatternGeneratorLocale)
                return m_cachedDateTimePatternGenerator.get();
        }
        return cacheSharedPatternGenerator(locale, status);
    }

    UDateTimePatternGenerator* cacheSharedPatternGenerator(const CString& locale, UErrorCode&);

    std::unique_ptr<UDateTimePatternGenerator, ICUDeleter<udatpg_close>> m_cachedDateTimePatternGenerator;
    CString m_cachedDateTimePatternGeneratorLocale;
};

} // namespace JSC