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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 "AXStitchUtilities.h"
#include "AXUtilities.h"
#include "AccessibilityNodeObject.h"
#include "Element.h"
#include "HTMLLabelElement.h"
#include "HTMLTableCellElement.h"
#include "RenderElementInlines.h"
#include "RenderStyle.h"
#include <wtf/Scope.h>
namespace WebCore {
StitchingContext::StitchingContext(const AccessibilityNodeObject& containingBlockFlowObject)
: containingBlockFlowObject(containingBlockFlowObject)
{ }
static bool hasEnclosingInputElement(Node* node)
{
return node && is<HTMLInputElement>(node->shadowHost());
}
static bool hasStitchBreakingRole(Element& element)
{
return hasAnyRole(element, {
// Cell roles
"gridcell"_s, "cell"_s, "columnheader"_s, "rowheader"_s
// Miscellaneous roles
"suggestion"_s, "insertion"_s, "deletion"_s
});
}
static bool hasStitchBreakingTag(Element& element)
{
switch (element.elementName()) {
case ElementName::HTML_ins:
case ElementName::HTML_del:
return true;
default:
return false;
}
}
static bool isStitchBreakingElement(Element& element)
{
return is<HTMLTableCellElement>(element)
|| is<HTMLLabelElement>(element)
|| hasStitchBreakingRole(element)
|| hasStitchBreakingTag(element);
}
bool shouldStopStitchingAt(const RenderObject& renderer, const AccessibilityObject& object, StitchingContext& context)
{
if (renderer.style().insideLink() != InsideLink::NotInside) {
// Stop stitching when encountering a link.
return true;
}
if (renderer.parent() && (renderer.parent()->isBeforeOrAfterContent() || renderer.parent()->isFirstLetter())) {
// Stitching generated content will cause incorrect behavior because
// some of our code that handles stitched text (e.g. stringValue) assumes
// the presence of a Node. For now, stop stitching at generated content.
// Ideally we remove this restriction in the future.
return true;
}
if (hasEnclosingInputElement(RefPtr { renderer.node() }.get())) {
// Don't stitch within text inputs. One example of why we want to avoid
// this is otherwise the number values of the chosen dates will get stitched
// with the "/"s that surround them, which is a poor user experience.
return true;
}
RefPtr node = renderer.node();
if (!node) {
// |renderer| may be generated content. Let's get the element that generated it.
if (renderer.parent())
node = renderer.parent()->generatingElement();
}
RefPtr<ContainerNode> stitchBreakingAncestor = nullptr;
while (node) {
RefPtr ancestor = composedParentIgnoringDocumentFragments(*node);
if (!ancestor)
break;
if (RefPtr ancestorElement = dynamicDowncast<Element>(*ancestor)) {
if (isStitchBreakingElement(*ancestorElement)) {
stitchBreakingAncestor = WTFMove(ancestor);
break;
}
}
node = WTFMove(ancestor);
}
RefPtr currentAncestor = object.parentObject();
while (currentAncestor) {
if (currentAncestor->owners().size()) {
stitchBreakingAncestor = nullptr;
return true;
}
if (currentAncestor == context.containingBlockFlowObject) {
// There are no re-ownerships on the way to our block flow, so we can stop.
break;
}
currentAncestor = currentAncestor->parentObject();
}
auto updateContext = makeScopeExit([&] {
if (node) {
// If we couldn't find a node for this renderer, we can't definitively
// say whether we had a stitch-breaking ancestor, so don't update the context.
context.lastStitchBreakingAncestor = stitchBreakingAncestor;
}
});
if (node && context.lastStitchBreakingAncestor && context.lastStitchBreakingAncestor != stitchBreakingAncestor) {
// Breaking stitching across semantic boundaries, like cells, controls, etc.
return true;
}
return false;
}
} // namespace WebCore
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