| /* |
| * Copyright (C) 2024-2025 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 "AXSearchManager.h" |
| |
| #include "AXLogger.h" |
| #include "AXObjectCache.h" |
| #include "AccessibilityObject.h" |
| #include "TextIterator.h" |
| |
| namespace WebCore { |
| |
| DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(AXSearchManager); |
| |
| // This function determines if the given `axObject` is a radio button part of a different ad-hoc radio group |
| // than `referenceObject`, where ad-hoc radio group membership is determined by comparing `name` attributes. |
| static bool isRadioButtonInDifferentAdhocGroup(Ref<AXCoreObject> axObject, AXCoreObject* referenceObject) |
| { |
| if (!axObject->isRadioButton()) |
| return false; |
| |
| // If the `referenceObject` is not a radio button and this `axObject` is, their radio group membership is different because |
| // `axObject` belongs to a group and `referenceObject` doesn't. |
| if (!referenceObject || !referenceObject->isRadioButton()) |
| return true; |
| |
| return axObject->nameAttribute() != referenceObject->nameAttribute(); |
| } |
| |
| bool AXSearchManager::matchForSearchKeyAtIndex(Ref<AXCoreObject> axObject, const AccessibilitySearchCriteria& criteria, size_t index) |
| { |
| switch (criteria.searchKeys[index]) { |
| case AccessibilitySearchKey::AnyType: |
| // The AccessibilitySearchKey::AnyType matches any non-null AccessibilityObject. |
| return true; |
| case AccessibilitySearchKey::Article: |
| return axObject->role() == AccessibilityRole::DocumentArticle; |
| case AccessibilitySearchKey::BlockquoteSameLevel: |
| return criteria.startObject |
| && axObject->isBlockquote() |
| && axObject->blockquoteLevel() == criteria.startObject->blockquoteLevel(); |
| case AccessibilitySearchKey::Blockquote: |
| return axObject->isBlockquote(); |
| case AccessibilitySearchKey::BoldFont: |
| return axObject->hasBoldFont(); |
| case AccessibilitySearchKey::Button: |
| return axObject->isButton(); |
| case AccessibilitySearchKey::Checkbox: |
| return axObject->isCheckbox(); |
| case AccessibilitySearchKey::Control: |
| return axObject->isControl() || axObject->isSummary(); |
| case AccessibilitySearchKey::DifferentType: |
| return criteria.startObject |
| && axObject->role() != criteria.startObject->role(); |
| case AccessibilitySearchKey::FontChange: |
| return criteria.startObject |
| && !axObject->hasSameFont(*criteria.startObject); |
| case AccessibilitySearchKey::FontColorChange: |
| return criteria.startObject |
| && !axObject->hasSameFontColor(*criteria.startObject); |
| case AccessibilitySearchKey::Frame: |
| return axObject->isWebArea(); |
| case AccessibilitySearchKey::Graphic: |
| return axObject->isImage(); |
| case AccessibilitySearchKey::HeadingLevel1: |
| return axObject->headingLevel() == 1; |
| case AccessibilitySearchKey::HeadingLevel2: |
| return axObject->headingLevel() == 2; |
| case AccessibilitySearchKey::HeadingLevel3: |
| return axObject->headingLevel() == 3; |
| case AccessibilitySearchKey::HeadingLevel4: |
| return axObject->headingLevel() == 4; |
| case AccessibilitySearchKey::HeadingLevel5: |
| return axObject->headingLevel() == 5; |
| case AccessibilitySearchKey::HeadingLevel6: |
| return axObject->headingLevel() == 6; |
| case AccessibilitySearchKey::HeadingSameLevel: |
| return criteria.startObject |
| && axObject->isHeading() |
| && axObject->headingLevel() == criteria.startObject->headingLevel(); |
| case AccessibilitySearchKey::Heading: |
| return axObject->isHeading(); |
| case AccessibilitySearchKey::Highlighted: |
| return axObject->hasHighlighting(); |
| case AccessibilitySearchKey::KeyboardFocusable: |
| return axObject->isKeyboardFocusable(); |
| case AccessibilitySearchKey::ItalicFont: |
| return axObject->hasItalicFont(); |
| case AccessibilitySearchKey::Landmark: |
| return axObject->isLandmark(); |
| case AccessibilitySearchKey::Link: { |
| bool isLink = axObject->isLink(); |
| #if PLATFORM(IOS_FAMILY) |
| if (!isLink) |
| isLink = axObject->isDescendantOfRole(AccessibilityRole::Link); |
| #endif |
| return isLink; |
| } |
| case AccessibilitySearchKey::List: |
| return axObject->isList(); |
| case AccessibilitySearchKey::LiveRegion: |
| return axObject->supportsLiveRegion(); |
| case AccessibilitySearchKey::MisspelledWord: { |
| auto ranges = axObject->misspellingRanges(); |
| bool hasMisspelling = !ranges.isEmpty(); |
| if (hasMisspelling) |
| m_misspellingRanges.set(axObject->objectID(), WTFMove(ranges)); |
| return hasMisspelling; |
| } |
| case AccessibilitySearchKey::Outline: |
| return axObject->isTree(); |
| case AccessibilitySearchKey::PlainText: |
| return axObject->hasPlainText(); |
| case AccessibilitySearchKey::RadioGroup: |
| return axObject->isRadioGroup() || isRadioButtonInDifferentAdhocGroup(axObject, criteria.startObject); |
| case AccessibilitySearchKey::SameType: |
| return criteria.startObject |
| && axObject->role() == criteria.startObject->role(); |
| case AccessibilitySearchKey::StaticText: |
| return axObject->isStaticText(); |
| case AccessibilitySearchKey::StyleChange: |
| return criteria.startObject |
| && !axObject->hasSameStyle(*criteria.startObject); |
| case AccessibilitySearchKey::TableSameLevel: |
| return criteria.startObject |
| && axObject->isTable() && axObject->isExposable() |
| && axObject->tableLevel() == criteria.startObject->tableLevel(); |
| case AccessibilitySearchKey::Table: |
| return axObject->isTable() && axObject->isExposable(); |
| case AccessibilitySearchKey::TextField: |
| return axObject->isTextControl(); |
| case AccessibilitySearchKey::Underline: |
| return axObject->hasUnderline(); |
| case AccessibilitySearchKey::UnvisitedLink: |
| return axObject->isUnvisitedLink(); |
| case AccessibilitySearchKey::VisitedLink: |
| return axObject->isVisitedLink(); |
| default: |
| return false; |
| } |
| } |
| |
| bool AXSearchManager::match(Ref<AXCoreObject> axObject, const AccessibilitySearchCriteria& criteria) |
| { |
| for (size_t i = 0; i < criteria.searchKeys.size(); ++i) { |
| if (matchForSearchKeyAtIndex(axObject, criteria, i)) |
| return criteria.visibleOnly ? axObject->isOnScreen() : true; |
| } |
| return false; |
| } |
| |
| bool AXSearchManager::matchText(Ref<AXCoreObject> axObject, const String& searchText) |
| { |
| // If text is empty we return true. |
| if (searchText.isEmpty()) |
| return true; |
| |
| return containsPlainText(axObject->title(), searchText, FindOption::CaseInsensitive) |
| || containsPlainText(axObject->description(), searchText, FindOption::CaseInsensitive) |
| || containsPlainText(axObject->stringValue(), searchText, FindOption::CaseInsensitive); |
| } |
| |
| bool AXSearchManager::matchWithResultsLimit(Ref<AXCoreObject> object, const AccessibilitySearchCriteria& criteria, AXCoreObject::AccessibilityChildrenVector& results) |
| { |
| if (match(object, criteria) && matchText(object, criteria.searchText)) { |
| results.append(object); |
| |
| // Enough results were found to stop searching. |
| if (results.size() >= criteria.resultsLimit) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void appendAccessibilityObject(Ref<AXCoreObject> object, AccessibilityObject::AccessibilityChildrenVector& results) |
| { |
| if (!object->isAttachment()) [[likely]] |
| results.append(WTFMove(object)); |
| else if (RefPtr axObject = dynamicDowncast<AccessibilityObject>(object)) { |
| // Find the next descendant of this attachment object so search can continue through frames. |
| RefPtr widget = axObject->widgetForAttachmentView(); |
| RefPtr frameView = dynamicDowncast<LocalFrameView>(widget); |
| if (!frameView) |
| return; |
| RefPtr document = frameView->frame().document(); |
| if (!document || !document->hasLivingRenderTree()) |
| return; |
| |
| CheckedPtr cache = axObject->axObjectCache(); |
| if (RefPtr axDocument = cache ? cache->getOrCreate(*document) : nullptr) |
| results.append(axDocument.releaseNonNull()); |
| } |
| } |
| |
| static void appendChildrenToArray(Ref<AXCoreObject> object, bool isForward, RefPtr<AXCoreObject> startObject, AXCoreObject::AccessibilityChildrenVector& results) |
| { |
| // A table's children includes elements whose own children are also the table's children (due to the way the Mac exposes tables). |
| // The rows from the table should be queried, since those are direct descendants of the table, and they contain content. |
| // FIXME: Unlike AXCoreObject::children(), AXCoreObject::rows() returns a copy, not a const-reference. This can be wasteful |
| // for tables with lots of rows and probably should be changed. |
| const auto& searchChildren = object->isTable() && object->isExposable() ? object->rows() : object->unignoredChildren(); |
| |
| size_t childrenSize = searchChildren.size(); |
| |
| size_t startIndex = isForward ? childrenSize : 0; |
| size_t endIndex = isForward ? 0 : childrenSize; |
| |
| // If the startObject is ignored, we should use an accessible sibling as a start element instead. |
| if (startObject && startObject->isIgnored() && startObject->isDescendantOfObject(object.get())) { |
| RefPtr<AXCoreObject> parentObject = startObject->parentObject(); |
| // Go up the parent chain to find the highest ancestor that's also being ignored. |
| while (parentObject && parentObject->isIgnored()) { |
| if (parentObject == object.ptr()) |
| break; |
| startObject = parentObject; |
| parentObject = parentObject->parentObject(); |
| } |
| |
| // We should only ever hit this case with a live object (not an isolated object), as it would require startObject to be ignored, |
| // and we should never have created an isolated object from an ignored live object. |
| // FIXME: This is not true for ENABLE(INCLUDE_IGNORED_IN_CORE_AX_TREE), fix this before shipping it. |
| // FIXME: We hit this ASSERT on google.com. https://bugs.webkit.org/show_bug.cgi?id=293263 |
| ASSERT(is<AccessibilityObject>(startObject)); |
| RefPtr newStartObject = dynamicDowncast<AccessibilityObject>(startObject.get()); |
| // Get the un-ignored sibling based on the search direction, and update the searchPosition. |
| if (newStartObject && newStartObject->isIgnored()) |
| newStartObject = isForward ? newStartObject->previousSiblingUnignored() : newStartObject->nextSiblingUnignored(); |
| startObject = newStartObject; |
| } |
| |
| size_t searchPosition = notFound; |
| if (startObject) { |
| searchPosition = searchChildren.findIf([&] (const Ref<AXCoreObject>& object) { |
| return startObject == object.ptr(); |
| }); |
| } |
| |
| if (searchPosition != notFound) { |
| if (isForward) |
| endIndex = searchPosition + 1; |
| else |
| endIndex = searchPosition; |
| } |
| |
| // This is broken into two statements so that it's easier read. |
| if (isForward) { |
| for (size_t i = startIndex; i > endIndex; i--) |
| appendAccessibilityObject(searchChildren.at(i - 1), results); |
| } else { |
| for (size_t i = startIndex; i < endIndex; i++) |
| appendAccessibilityObject(searchChildren.at(i), results); |
| } |
| } |
| |
| AXCoreObject::AccessibilityChildrenVector AXSearchManager::findMatchingObjectsInternal(const AccessibilitySearchCriteria& criteria) |
| { |
| AXTRACE("AXSearchManager::findMatchingObjectsInternal"_s); |
| AXLOG(criteria); |
| |
| if (!criteria.searchKeys.size()) |
| return { }; |
| |
| #if PLATFORM(MAC) |
| if (criteria.searchKeys.size() == 1) { |
| // Only perform these optimizations if we aren't expected to start from somewhere mid-tree. |
| // We could probably implement these optimizations when we do have a startObject and get |
| // performance benefits, but no known assistive technology needs this right now. |
| if (!criteria.startObject) { |
| if (criteria.searchKeys[0] == AccessibilitySearchKey::LiveRegion) { |
| if (criteria.anchorObject->isRootWebArea()) { |
| // All live regions will be descendants of the root webarea, so we don't need to do |
| // any ancestry walks as `sortedDescendants` does. |
| auto liveRegions = criteria.anchorObject->allSortedLiveRegions(); |
| return liveRegions.subvector(0, std::min(liveRegions.size(), static_cast<size_t>(criteria.resultsLimit))); |
| } |
| return criteria.anchorObject->sortedDescendants(criteria.resultsLimit, PreSortedObjectType::LiveRegion); |
| } |
| |
| if (criteria.searchKeys[0] == AccessibilitySearchKey::Frame) { |
| if (criteria.anchorObject->isRootWebArea()) { |
| auto webAreas = criteria.anchorObject->allSortedNonRootWebAreas(); |
| return webAreas.subvector(0, std::min(webAreas.size(), static_cast<size_t>(criteria.resultsLimit))); |
| } |
| return criteria.anchorObject->sortedDescendants(criteria.resultsLimit, PreSortedObjectType::WebArea); |
| } |
| } |
| } |
| #endif // PLATFORM(MAC) |
| |
| AXCoreObject::AccessibilityChildrenVector results; |
| // This search algorithm only searches the elements before/after the starting object. |
| // It does this by stepping up the parent chain and at each level doing a DFS. |
| |
| // If there's no start object, it means we want to search everything. |
| RefPtr<AXCoreObject> startObject = criteria.startObject; |
| if (!startObject) |
| startObject = criteria.anchorObject; |
| |
| bool isForward = criteria.searchDirection == AccessibilitySearchDirection::Next; |
| |
| // The first iteration of the outer loop will examine the children of the start object for matches. However, when |
| // iterating backwards, the start object children should not be considered, so the loop is skipped ahead. We make an |
| // exception when no start object was specified because we want to search everything regardless of search direction. |
| RefPtr<AXCoreObject> previousObject; |
| if (!isForward && startObject != criteria.anchorObject) { |
| previousObject = startObject; |
| startObject = startObject->parentObjectUnignored(); |
| } |
| |
| // The outer loop steps up the parent chain each time (unignored is important here because otherwise elements would be searched twice) |
| for (RefPtr stopSearchElement = criteria.anchorObject->parentObjectUnignored(); startObject && startObject != stopSearchElement; startObject = startObject->parentObjectUnignored()) { |
| // Only append the children after/before the previous element, so that the search does not check elements that are |
| // already behind/ahead of start element. |
| AXCoreObject::AccessibilityChildrenVector searchStack; |
| if (!criteria.immediateDescendantsOnly || startObject == criteria.anchorObject) |
| appendChildrenToArray(*startObject, isForward, previousObject, searchStack); |
| |
| // This now does a DFS at the current level of the parent. |
| while (!searchStack.isEmpty()) { |
| auto searchObject = searchStack.last(); |
| searchStack.removeLast(); |
| |
| if (matchWithResultsLimit(searchObject, criteria, results)) |
| break; |
| |
| if (!criteria.immediateDescendantsOnly) |
| appendChildrenToArray(searchObject, isForward, nullptr, searchStack); |
| } |
| |
| if (results.size() >= criteria.resultsLimit) |
| break; |
| |
| // When moving backwards, the parent object needs to be checked, because technically it's "before" the starting element. |
| if (!isForward && startObject != criteria.anchorObject && matchWithResultsLimit(*startObject, criteria, results)) |
| break; |
| |
| previousObject = startObject; |
| } |
| |
| AXLOG(results); |
| return results; |
| } |
| |
| std::optional<AXTextMarkerRange> AXSearchManager::findMatchingRange(AccessibilitySearchCriteria&& criteria) |
| { |
| AXTRACE("AXSearchManager::findMatchingRange"_s); |
| |
| // Currently, this method only supports searching for the next/previous misspelling. |
| // FIXME: support other types of ranges, like italicized. |
| if (criteria.searchKeys.size() != 1 || criteria.searchKeys[0] != AccessibilitySearchKey::MisspelledWord || criteria.resultsLimit != 1) { |
| ASSERT_NOT_REACHED(); |
| return std::nullopt; |
| } |
| |
| // If there's no start object, it means we want to search everything. |
| RefPtr startObject = criteria.startObject; |
| if (!startObject) |
| startObject = criteria.anchorObject; |
| AXLOG(startObject); |
| |
| bool forward = criteria.searchDirection == AccessibilitySearchDirection::Next; |
| if (match(*startObject, criteria)) { |
| ASSERT(m_misspellingRanges.contains(startObject->objectID())); |
| const auto& ranges = m_misspellingRanges.get(startObject->objectID()); |
| ASSERT(!ranges.isEmpty()); |
| |
| AXTextMarkerRange startRange { startObject->treeID(), startObject->objectID(), criteria.startRange }; |
| if (forward) { |
| for (auto& range : ranges) { |
| if (range > startRange) |
| return range; |
| } |
| } else { |
| for (auto& range : makeReversedRange(ranges)) { |
| if (range < startRange) |
| return range; |
| } |
| } |
| } |
| |
| // Didn't find a matching range for startObject, thus move to the next/previous object. |
| auto objects = findMatchingObjectsInternal(criteria); |
| if (!objects.isEmpty()) { |
| Ref object = objects[0]; |
| ASSERT(m_misspellingRanges.contains(object->objectID())); |
| const auto& ranges = m_misspellingRanges.get(object->objectID()); |
| ASSERT(!ranges.isEmpty()); |
| return forward ? ranges[0] : ranges.last(); |
| } |
| return std::nullopt; |
| } |
| |
| } // namespace WebCore |
