JSCustomElementInterface.cpp   [plain text]

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 * Copyright (C) 2015 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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#include "config.h"
#include "JSCustomElementInterface.h"

#if ENABLE(CUSTOM_ELEMENTS)

#include "DOMWrapperWorld.h"
#include "JSDOMGlobalObject.h"
#include "JSElement.h"
#include "JSHTMLElement.h"
#include "JSMainThreadExecState.h"
#include "JSMainThreadExecStateInstrumentation.h"
#include "ScriptExecutionContext.h"
#include <heap/WeakInlines.h>
#include <runtime/JSLock.h>

using namespace JSC;

namespace WebCore {

JSCustomElementInterface::JSCustomElementInterface(const QualifiedName& name, JSObject* constructor, JSDOMGlobalObject* globalObject)
    : ActiveDOMCallback(globalObject->scriptExecutionContext())
    , m_name(name)
    , m_constructor(constructor)
    , m_isolatedWorld(&globalObject->world())
{
}

JSCustomElementInterface::~JSCustomElementInterface()
{
}

RefPtr<Element> JSCustomElementInterface::constructElement(const AtomicString& tagName, ShouldClearException shouldClearException)
{
    if (!canInvokeCallback())
        return nullptr;

    Ref<JSCustomElementInterface> protectedThis(*this);

    JSLockHolder lock(m_isolatedWorld->vm());

    if (!m_constructor)
        return nullptr;

    ScriptExecutionContext* context = scriptExecutionContext();
    if (!context)
        return nullptr;
    ASSERT(context->isDocument());
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(context, *m_isolatedWorld);
    ExecState* state = globalObject->globalExec();

    ConstructData constructData;
    ConstructType constructType = m_constructor->methodTable()->getConstructData(m_constructor.get(), constructData);
    if (constructType == ConstructType::None) {
        ASSERT_NOT_REACHED();
        return nullptr;
    }

    MarkedArgumentBuffer args;
    args.append(jsStringWithCache(state, tagName));

    InspectorInstrumentationCookie cookie = JSMainThreadExecState::instrumentFunctionConstruct(context, constructType, constructData);
    JSValue newElement = construct(state, m_constructor.get(), constructType, constructData, args);
    InspectorInstrumentation::didCallFunction(cookie, context);

    if (shouldClearException == ShouldClearException::Clear && state->hadException())
        state->clearException();

    if (newElement.isEmpty())
        return nullptr;

    Element* wrappedElement = JSElement::toWrapped(newElement);
    if (!wrappedElement)
        return nullptr;
    wrappedElement->setCustomElementIsResolved();
    return wrappedElement;
}

void JSCustomElementInterface::upgradeElement(Element& element)
{
    ASSERT(element.isUnresolvedCustomElement());
    if (!canInvokeCallback())
        return;

    Ref<JSCustomElementInterface> protectedThis(*this);
    JSLockHolder lock(m_isolatedWorld->vm());

    if (!m_constructor)
        return;

    ScriptExecutionContext* context = scriptExecutionContext();
    if (!context)
        return;
    ASSERT(context->isDocument());
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(context, *m_isolatedWorld);
    ExecState* state = globalObject->globalExec();
    if (state->hadException())
        return;

    ConstructData constructData;
    ConstructType constructType = m_constructor->methodTable()->getConstructData(m_constructor.get(), constructData);
    if (constructType == ConstructType::None) {
        ASSERT_NOT_REACHED();
        return;
    }

    m_constructionStack.append(&element);

    MarkedArgumentBuffer args;
    InspectorInstrumentationCookie cookie = JSMainThreadExecState::instrumentFunctionConstruct(context, constructType, constructData);
    JSValue returnedElement = construct(state, m_constructor.get(), constructType, constructData, args);
    InspectorInstrumentation::didCallFunction(cookie, context);

    m_constructionStack.removeLast();

    if (state->hadException())
        return;

    Element* wrappedElement = JSElement::toWrapped(returnedElement);
    if (!wrappedElement || wrappedElement != &element) {
        throwInvalidStateError(*state, "Custom element constructor failed to upgrade an element");
        return;
    }
    wrappedElement->setCustomElementIsResolved();
    ASSERT(wrappedElement->isCustomElement());
}

void JSCustomElementInterface::attributeChanged(Element& element, const QualifiedName& attributeName, const AtomicString& oldValue, const AtomicString& newValue)
{
    if (!canInvokeCallback())
        return;

    Ref<JSCustomElementInterface> protectedThis(*this);

    JSLockHolder lock(m_isolatedWorld->vm());

    ScriptExecutionContext* context = scriptExecutionContext();
    if (!context)
        return;

    ASSERT(context->isDocument());
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(context, *m_isolatedWorld);
    ExecState* state = globalObject->globalExec();

    JSObject* jsElement = asObject(toJS(state, globalObject, element));

    PropertyName attributeChanged(Identifier::fromString(state, "attributeChangedCallback"));
    JSValue callback = jsElement->get(state, attributeChanged);
    CallData callData;
    CallType callType = getCallData(callback, callData);
    if (callType == CallType::None)
        return;

    const AtomicString& namespaceURI = attributeName.namespaceURI();
    MarkedArgumentBuffer args;
    args.append(jsStringWithCache(state, attributeName.localName()));
    args.append(oldValue == nullAtom ? jsNull() : jsStringWithCache(state, oldValue));
    args.append(newValue == nullAtom ? jsNull() : jsStringWithCache(state, newValue));
    args.append(namespaceURI == nullAtom ? jsNull() : jsStringWithCache(state, attributeName.namespaceURI()));

    InspectorInstrumentationCookie cookie = JSMainThreadExecState::instrumentFunctionCall(context, callType, callData);

    NakedPtr<Exception> exception;
    JSMainThreadExecState::call(state, callback, callType, callData, jsElement, args, exception);

    InspectorInstrumentation::didCallFunction(cookie, context);

    if (exception)
        reportException(state, exception);
}
    
void JSCustomElementInterface::didUpgradeLastElementInConstructionStack()
{
    m_constructionStack.last() = nullptr;
}

} // namespace WebCore

#endif