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/*
* 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 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 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 <runtime/JSCJSValueInlines.h>
#include <runtime/JSCellInlines.h>
#include <type_traits>
namespace WebCore {
template<typename To, typename From>
using JSDynamicCastResult = typename std::conditional<std::is_const<From>::value, const To, To>::type*;
class JSNode;
template<typename From>
JSDynamicCastResult<JSNode, From> jsNodeCast(From* value);
class JSElement;
template<typename From>
JSDynamicCastResult<JSElement, From> jsElementCast(From* value);
class JSDocument;
template<typename From>
JSDynamicCastResult<JSDocument, From> jsDocumentCast(From* value);
class JSEvent;
template<typename From>
JSDynamicCastResult<JSEvent, From> jsEventCast(From* value);
template<typename Select>
struct JSDynamicCastTrait {
template<typename To, typename From>
ALWAYS_INLINE static To cast(JSC::VM& vm, From* from)
{
return JSC::jsDynamicCast<To>(vm, from);
}
};
template<>
struct JSDynamicCastTrait<JSNode> {
template<typename To, typename From>
ALWAYS_INLINE static To cast(JSC::VM&, From* from)
{
return jsNodeCast(from);
}
};
template<>
struct JSDynamicCastTrait<JSElement> {
template<typename To, typename From>
ALWAYS_INLINE static To cast(JSC::VM&, From* from)
{
return jsElementCast(from);
}
};
template<>
struct JSDynamicCastTrait<JSDocument> {
template<typename To, typename From>
ALWAYS_INLINE static To cast(JSC::VM&, From* from)
{
return jsDocumentCast(from);
}
};
template<>
struct JSDynamicCastTrait<JSEvent> {
template<typename To, typename From>
ALWAYS_INLINE static To cast(JSC::VM&, From* from)
{
return jsEventCast(from);
}
};
template<typename To, typename From>
ALWAYS_INLINE To jsDynamicDowncast(JSC::VM& vm, From* from)
{
typedef JSDynamicCastTrait<typename std::remove_cv<typename std::remove_pointer<To>::type>::type> Dispatcher;
return Dispatcher::template cast<To>(vm, from);
}
template<typename To>
ALWAYS_INLINE To jsDynamicDowncast(JSC::VM& vm, JSC::JSValue from)
{
if (UNLIKELY(!from.isCell()))
return nullptr;
return jsDynamicDowncast<To>(vm, from.asCell());
}
}
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