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Bug 1769586 - P1: Implement ARIA element reflection in Element and ElementInternals. r=peterv

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Differential Revision: https://phabricator.services.mozilla.com/D209767
This commit is contained in:
Eitan Isaacson
2024-11-29 03:26:34 +00:00
parent 05aa173dd2
commit fe237f4955
13 changed files with 424 additions and 143 deletions
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210
dom/base/Element.cpp
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@@ -1835,25 +1835,40 @@ already_AddRefed<nsIHTMLCollection> Element::GetElementsByClassName(
return nsContentUtils::GetElementsByClassName(this, aClassNames);
}
bool Element::HasSharedRoot(const Element* aElement) const {
nsINode* root = SubtreeRoot();
nsINode* attrSubtreeRoot = aElement->SubtreeRoot();
do {
if (root == attrSubtreeRoot) {
return true;
}
auto* shadow = ShadowRoot::FromNode(root);
if (!shadow || !shadow->GetHost()) {
break;
}
root = shadow->GetHost()->SubtreeRoot();
} while (true);
return false;
}
Element* Element::GetElementByIdInDocOrSubtree(nsAtom* aID) const {
if (auto* docOrShadowRoot = GetContainingDocumentOrShadowRoot()) {
return docOrShadowRoot->GetElementById(aID);
}
return nsContentUtils::MatchElementId(SubtreeRoot()->AsContent(), aID);
}
Element* Element::GetAttrAssociatedElement(nsAtom* aAttr) const {
if (const nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots()) {
nsWeakPtr weakAttrEl = slots->mExplicitlySetAttrElements.Get(aAttr);
nsWeakPtr weakAttrEl = slots->mExplicitlySetAttrElementMap.Get(aAttr);
if (nsCOMPtr<Element> attrEl = do_QueryReferent(weakAttrEl)) {
// If reflectedTarget's explicitly set attr-element |attrEl| is
// a descendant of any of element's shadow-including ancestors, then
// return |atrEl|.
nsINode* root = SubtreeRoot();
nsINode* attrSubtreeRoot = attrEl->SubtreeRoot();
do {
if (root == attrSubtreeRoot) {
return attrEl;
}
auto* shadow = ShadowRoot::FromNode(root);
if (!shadow || !shadow->GetHost()) {
break;
}
root = shadow->GetHost()->SubtreeRoot();
} while (true);
if (HasSharedRoot(attrEl)) {
return attrEl;
}
return nullptr;
}
}
@@ -1866,23 +1881,102 @@ Element* Element::GetAttrAssociatedElement(nsAtom* aAttr) const {
MOZ_ASSERT(value->Type() == nsAttrValue::eAtom,
"Attribute used for attr associated element must be parsed");
nsAtom* valueAtom = value->GetAtomValue();
if (auto* docOrShadowRoot = GetContainingDocumentOrShadowRoot()) {
return docOrShadowRoot->GetElementById(valueAtom);
return GetElementByIdInDocOrSubtree(value->GetAtomValue());
}
void Element::GetAttrAssociatedElements(
nsAtom* aAttr, bool* aUseCachedValue,
Nullable<nsTArray<RefPtr<Element>>>& aElements) {
MOZ_ASSERT(aElements.IsNull());
auto& [explicitlySetAttrElements, cachedAttrElements] =
ExtendedDOMSlots()->mAttrElementsMap.LookupOrInsert(aAttr);
// https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#attr-associated-elements
auto getAttrAssociatedElements =
[&, &explicitlySetAttrElements =
explicitlySetAttrElements]() -> Maybe<nsTArray<RefPtr<Element>>> {
nsTArray<RefPtr<Element>> elements;
if (explicitlySetAttrElements) {
// 3. If reflectedTarget's explicitly set attr-elements is not null
for (const nsWeakPtr& weakEl : *explicitlySetAttrElements) {
// For each attrElement in reflectedTarget's explicitly set
// attr-elements:
if (nsCOMPtr<Element> attrEl = do_QueryReferent(weakEl)) {
// If attrElement is not a descendant of any of element's
// shadow-including ancestors, then continue.
if (!HasSharedRoot(attrEl)) {
continue;
}
// Append attrElement to elements.
elements.AppendElement(attrEl);
}
}
} else {
// 4. Otherwise
// 1. Let contentAttributeValue be the result of running
// reflectedTarget's get the content attribute.
const nsAttrValue* value = GetParsedAttr(aAttr);
// 2. If contentAttributeValue is null, then return null.
if (!value) {
return Nothing();
}
// 3. Let tokens be contentAttributeValue, split on ASCII whitespace.
MOZ_ASSERT(value->Type() == nsAttrValue::eAtomArray ||
value->Type() == nsAttrValue::eAtom,
"Attribute used for attr associated elements must be parsed");
for (uint32_t i = 0; i < value->GetAtomCount(); i++) {
// For each id of tokens:
if (auto* candidate = GetElementByIdInDocOrSubtree(
value->AtomAt(static_cast<int32_t>(i)))) {
// Append candidate to elements.
elements.AppendElement(candidate);
}
}
}
return Some(std::move(elements));
};
// getter steps:
// 1. Let elements be the result of running this's get the attr-associated
// elements.
auto elements = getAttrAssociatedElements();
if (elements && elements == cachedAttrElements) {
// 2. If the contents of elements is equal to the contents of this's cached
// attr-associated elements, then return this's cached attr-associated
// elements object.
MOZ_ASSERT(!*aUseCachedValue);
*aUseCachedValue = true;
return;
}
nsINode* root = SubtreeRoot();
for (auto* node = root; node; node = node->GetNextNode(root)) {
if (node->HasID() && node->AsContent()->GetID() == valueAtom) {
return node->AsElement();
}
// 3. Let elementsAsFrozenArray be elements, converted to a FrozenArray<T>?.
// (the binding code takes aElements and returns it as a FrozenArray)
// 5. Set this's cached attr-associated elements object to
// elementsAsFrozenArray.
// (the binding code stores the attr-associated elements object in a slot)
// 6. Return elementsAsFrozenArray.
if (elements) {
aElements.SetValue(elements->Clone());
}
return nullptr;
// 4. Set this's cached attr-associated elements to elements.
cachedAttrElements = std::move(elements);
}
void Element::ClearExplicitlySetAttrElement(nsAtom* aAttr) {
if (auto* slots = GetExistingExtendedDOMSlots()) {
slots->mExplicitlySetAttrElements.Remove(aAttr);
slots->mExplicitlySetAttrElementMap.Remove(aAttr);
}
}
void Element::ClearExplicitlySetAttrElements(nsAtom* aAttr) {
if (auto* slots = GetExistingExtendedDOMSlots()) {
slots->mAttrElementsMap.Remove(aAttr);
}
}
@@ -1905,7 +1999,7 @@ void Element::ExplicitlySetAttrElement(nsAtom* aAttr, Element* aElement) {
#endif
SetAttr(aAttr, EmptyString(), IgnoreErrors());
nsExtendedDOMSlots* slots = ExtendedDOMSlots();
slots->mExplicitlySetAttrElements.InsertOrUpdate(
slots->mExplicitlySetAttrElementMap.InsertOrUpdate(
aAttr, do_GetWeakReference(aElement));
#ifdef ACCESSIBILITY
if (accService) {
@@ -1929,9 +2023,48 @@ void Element::ExplicitlySetAttrElement(nsAtom* aAttr, Element* aElement) {
#endif
}
void Element::ExplicitlySetAttrElements(
nsAtom* aAttr,
const Nullable<Sequence<OwningNonNull<Element>>>& aElements) {
#ifdef ACCESSIBILITY
nsAccessibilityService* accService = GetAccService();
#endif
// Accessibility requires that no other attribute changes occur between
// AttrElementWillChange and AttrElementChanged. Scripts could cause
// this, so don't let them run here. We do this even if accessibility isn't
// running so that the JS behavior is consistent regardless of accessibility.
// Otherwise, JS might be able to use this difference to determine whether
// accessibility is running, which would be a privacy concern.
nsAutoScriptBlocker scriptBlocker;
#ifdef ACCESSIBILITY
if (accService) {
accService->NotifyAttrElementWillChange(this, aAttr);
}
#endif
if (aElements.IsNull()) {
ClearExplicitlySetAttrElements(aAttr);
UnsetAttr(aAttr, IgnoreErrors());
} else {
SetAttr(aAttr, EmptyString(), IgnoreErrors());
auto& entry = ExtendedDOMSlots()->mAttrElementsMap.LookupOrInsert(aAttr);
entry.first.emplace(nsTArray<nsWeakPtr>());
for (Element* el : aElements.Value()) {
entry.first->AppendElement(do_GetWeakReference(el));
}
}
#ifdef ACCESSIBILITY
if (accService) {
accService->NotifyAttrElementChanged(this, aAttr);
}
#endif
}
Element* Element::GetExplicitlySetAttrElement(nsAtom* aAttr) const {
if (const nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots()) {
nsWeakPtr weakAttrEl = slots->mExplicitlySetAttrElements.Get(aAttr);
nsWeakPtr weakAttrEl = slots->mExplicitlySetAttrElementMap.Get(aAttr);
if (nsCOMPtr<Element> attrEl = do_QueryReferent(weakAttrEl)) {
return attrEl;
}
@@ -2897,7 +3030,14 @@ bool Element::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
}
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::_class || aAttribute == nsGkAtoms::part) {
if (aAttribute == nsGkAtoms::_class || aAttribute == nsGkAtoms::part ||
aAttribute == nsGkAtoms::aria_controls ||
aAttribute == nsGkAtoms::aria_describedby ||
aAttribute == nsGkAtoms::aria_details ||
aAttribute == nsGkAtoms::aria_errormessage ||
aAttribute == nsGkAtoms::aria_flowto ||
aAttribute == nsGkAtoms::aria_labelledby ||
aAttribute == nsGkAtoms::aria_owns) {
aResult.ParseAtomArray(aValue);
return true;
}
@@ -2969,6 +3109,14 @@ void Element::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
}
} else if (aName == nsGkAtoms::aria_activedescendant) {
ClearExplicitlySetAttrElement(aName);
} else if (aName == nsGkAtoms::aria_controls ||
aName == nsGkAtoms::aria_describedby ||
aName == nsGkAtoms::aria_details ||
aName == nsGkAtoms::aria_errormessage ||
aName == nsGkAtoms::aria_flowto ||
aName == nsGkAtoms::aria_labelledby ||
aName == nsGkAtoms::aria_owns) {
ClearExplicitlySetAttrElements(aName);
}
}
}
@@ -3025,6 +3173,16 @@ void Element::OnAttrSetButNotChanged(int32_t aNamespaceID, nsAtom* aName,
aName == nsGkAtoms::aria_activedescendant) {
ClearExplicitlySetAttrElement(aName);
}
if (aNamespaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::aria_controls ||
aName == nsGkAtoms::aria_describedby ||
aName == nsGkAtoms::aria_details ||
aName == nsGkAtoms::aria_errormessage ||
aName == nsGkAtoms::aria_flowto || aName == nsGkAtoms::aria_labelledby ||
aName == nsGkAtoms::aria_owns)) {
ClearExplicitlySetAttrElements(aName);
}
}
EventListenerManager* Element::GetEventListenerManagerForAttr(nsAtom* aAttrName,