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/*
* Copyright (C) 2025 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.
*/
#include "config.h"
#include "FindRevealAlgorithms.h"
#include "Document.h"
#include "ElementInlines.h"
#include "Event.h"
#include "EventNames.h"
#include "HTMLDetailsElement.h"
#include "HTMLSlotElement.h"
#include "NodeRenderStyle.h"
#include "RenderStyleInlines.h"
#include "Settings.h"
#include "UserAgentParts.h"
namespace WebCore {
enum class RevealType : bool {
ClosedDetails,
HiddenUntilFound
};
// https://html.spec.whatwg.org/#ancestor-revealing-algorithm
bool revealClosedDetailsAndHiddenUntilFoundAncestors(Node& node)
{
node.protectedDocument()->updateStyleIfNeeded();
// Bail out if there is neither a hidden=until-found or details ancestor.
if (node.renderStyle() && !node.renderStyle()->autoRevealsWhenFound())
return false;
auto closedDetailsElementAncestor = [](Node& node) -> HTMLDetailsElement* {
RefPtr slot = node.assignedSlot();
if (slot && slot->userAgentPart() == UserAgentParts::detailsContent() && slot->shadowHost()) {
Ref details = downcast<HTMLDetailsElement>(*slot->shadowHost());
if (!details->hasAttributeWithoutSynchronization(HTMLNames::openAttr))
return details.unsafePtr();
}
return nullptr;
};
Vector<std::pair<Ref<HTMLElement>, RevealType>> ancestors;
for (RefPtr ancestor = node; ancestor->parentElementInComposedTree(); ancestor = ancestor->parentElementInComposedTree()) {
if (RefPtr element = dynamicDowncast<HTMLElement>(*ancestor); element && element->isHiddenUntilFound())
ancestors.append({ element.releaseNonNull(), RevealType::HiddenUntilFound });
if (RefPtr details = closedDetailsElementAncestor(*ancestor))
ancestors.append({ details.releaseNonNull(), RevealType::ClosedDetails });
}
auto revealed = false;
for (auto [element, revealType] : ancestors) {
if (!element->isConnected())
return revealed;
switch (revealType) {
case RevealType::ClosedDetails:
if (element->hasAttributeWithoutSynchronization(HTMLNames::openAttr))
return revealed;
element->setBooleanAttribute(HTMLNames::openAttr, true);
revealed = true;
break;
case RevealType::HiddenUntilFound:
if (!element->isHiddenUntilFound())
return revealed;
element->dispatchEvent(Event::create(eventNames().beforematchEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
if (!element->isConnected() || !element->isHiddenUntilFound())
return revealed;
element->setHidden({ });
revealed = true;
break;
}
}
return revealed;
}
} // namespace WebCore
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