Source/WebCore/bindings/js/JSMutationObserverCustom.cpp

/*
 * Copyright (C) 2011 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#include "config.h"
#include "JSMutationObserver.h"

#include "ExceptionCode.h"
#include "JSMutationCallback.h"
#include "JSNodeCustom.h"
#include "MutationObserver.h"
#include <runtime/Error.h>
#include <runtime/PrivateName.h>

using namespace JSC;

namespace WebCore {

EncodedJSValue JSC_HOST_CALL constructJSMutationObserver(ExecState& exec)
{
    if (exec.argumentCount() < 1)
        return throwVMError(&exec, createNotEnoughArgumentsError(&exec));

    JSObject* object = exec.uncheckedArgument(0).getObject();
    CallData callData;
    if (!object || object->methodTable()->getCallData(object, callData) == CallType::None)
        return throwVMTypeError(&exec, ASCIILiteral("Callback argument must be a function"));

    DOMConstructorObject* jsConstructor = jsCast<DOMConstructorObject*>(exec.callee());
    auto callback = JSMutationCallback::create(object, jsConstructor->globalObject());
    JSObject* jsObserver = asObject(toJSNewlyCreated(&exec, jsConstructor->globalObject(), MutationObserver::create(WTFMove(callback))));
    PrivateName propertyName;
    jsObserver->putDirect(jsConstructor->globalObject()->vm(), propertyName, object);
    return JSValue::encode(jsObserver);
}

bool JSMutationObserverOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, SlotVisitor& visitor)
{
    for (auto* node : jsCast<JSMutationObserver*>(handle.slot()->asCell())->wrapped().observedNodes()) {
        if (visitor.containsOpaqueRoot(root(node)))
            return true;
    }
    return false;
}

} // namespace WebCore