Source/WebCore/bindings/js/JSDOMConvertEnumeration.h

/*
 * Copyright (C) 2016 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
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "IDLTypes.h"
#include "JSDOMConvertBase.h"

namespace WebCore {

// Specialized by generated code for IDL enumeration conversion.
template<typename T> Optional<T> parseEnumeration(JSC::ExecState&, JSC::JSValue);
template<typename T> const char* expectedEnumerationValues();

// Specialized by generated code for IDL enumeration conversion.
template<typename T> JSC::JSString* convertEnumerationToJS(JSC::ExecState&, T);


template<typename T> struct Converter<IDLEnumeration<T>> : DefaultConverter<IDLEnumeration<T>> {
    template<typename ExceptionThrower = DefaultExceptionThrower>
    static T convert(JSC::ExecState& state, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
    {
        auto& vm = state.vm();
        auto throwScope = DECLARE_THROW_SCOPE(vm);

        auto result = parseEnumeration<T>(state, value);
        RETURN_IF_EXCEPTION(throwScope, { });

        if (UNLIKELY(!result)) {
            exceptionThrower(state, throwScope);
            return { };
        }
        return result.value();
    }
};

template<typename T> struct JSConverter<IDLEnumeration<T>> {
    static constexpr bool needsState = true;
    static constexpr bool needsGlobalObject = false;

    static JSC::JSValue convert(JSC::ExecState& exec, T value)
    {
        return convertEnumerationToJS(exec, value);
    }
};

} // namespace WebCore