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/*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "AccessibilityTree.h"
#include "AXObjectCache.h"
#include "AccessibilityTreeItem.h"
#include "Element.h"
#include "HTMLNames.h"
#include <wtf/Deque.h>
namespace WebCore {
using namespace HTMLNames;
AccessibilityTree::AccessibilityTree(RenderObject* renderer)
: AccessibilityRenderObject(renderer)
{
}
AccessibilityTree::~AccessibilityTree() = default;
Ref<AccessibilityTree> AccessibilityTree::create(RenderObject* renderer)
{
return adoptRef(*new AccessibilityTree(renderer));
}
bool AccessibilityTree::computeAccessibilityIsIgnored() const
{
return accessibilityIsIgnoredByDefault();
}
AccessibilityRole AccessibilityTree::determineAccessibilityRole()
{
if ((m_ariaRole = determineAriaRoleAttribute()) != AccessibilityRole::Tree)
return AccessibilityRenderObject::determineAccessibilityRole();
return isTreeValid() ? AccessibilityRole::Tree : AccessibilityRole::Group;
}
bool AccessibilityTree::nodeHasTreeItemChild(Node& node) const
{
for (auto* child = node.firstChild(); child; child = child->nextSibling()) {
if (nodeHasRole(child, "treeitem"_s))
return true;
}
return false;
}
bool AccessibilityTree::isTreeValid() const
{
// A valid tree can only have treeitem or group of treeitems as a child
// https://www.w3.org/TR/wai-aria/#tree
Node* node = this->node();
if (!node)
return false;
Deque<Node*> queue;
for (auto* child = node->firstChild(); child; child = child->nextSibling())
queue.append(child);
while (!queue.isEmpty()) {
auto child = queue.takeFirst();
if (!is<Element>(*child))
continue;
if (nodeHasRole(child, "treeitem"_s))
continue;
if (nodeHasRole(child, "presentation"_s)) {
if (!nodeHasTreeItemChild(*child))
return false;
continue;
}
if (!nodeHasRole(child, "group"_s))
return false;
for (auto* groupChild = child->firstChild(); groupChild; groupChild = groupChild->nextSibling())
queue.append(groupChild);
}
return true;
}
} // namespace WebCore
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