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LibWeb: Add Function To Build Accessiblity Tree

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With this patch, the accessibility tree can be build from the root
node of a document. This can then be serialzed and sent to (soon
to come) consumers.
This commit is contained in:
Jonah 2022-12-11 12:38:27 -06:00 • committed by Sam Atkins
parent cd95e5f656
commit 3eef54823a
4 changed files with 118 additions and 0 deletions
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76
Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.cpp Normal file
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/*
* Copyright (c) 2022, Jonah Shafran <jonahshafran@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Tuple.h>
#include <LibWeb/DOM/AccessibilityTreeNode.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/Node.h>
#include <LibWeb/DOM/Text.h>
namespace Web::DOM {
JS::NonnullGCPtr<AccessibilityTreeNode> AccessibilityTreeNode::create(Document* document, DOM::Node const* value)
{
return *document->heap().allocate<AccessibilityTreeNode>(document->realm(), value);
}
AccessibilityTreeNode::AccessibilityTreeNode(JS::GCPtr<DOM::Node> value)
: m_value(value)
{
m_children = {};
}
void AccessibilityTreeNode::serialize_tree_as_json(JsonObjectSerializer<StringBuilder>& object) const
{
if (value()->is_document()) {
VERIFY_NOT_REACHED();
} else if (value()->is_element()) {
auto const* element = static_cast<DOM::Element*>(value().ptr());
if (element->include_in_accessibility_tree()) {
MUST(object.add("type"sv, "element"sv));
auto role = element->role_or_default();
bool has_role = !role.is_null() && !role.is_empty() && !ARIARoleNames::is_abstract_aria_role(role);
if (has_role)
MUST(object.add("role"sv, role.view()));
else
MUST(object.add("role"sv, ""sv));
} else {
VERIFY_NOT_REACHED();
}
} else if (value()->is_text()) {
MUST(object.add("type"sv, "text"sv));
auto const* text_node = static_cast<DOM::Text*>(value().ptr());
MUST(object.add("text"sv, text_node->data()));
}
if (value()->has_child_nodes()) {
auto node_children = MUST(object.add_array("children"sv));
for (auto child : children()) {
if (child->value()->is_uninteresting_whitespace_node())
continue;
JsonObjectSerializer<StringBuilder> child_object = MUST(node_children.add_object());
child->serialize_tree_as_json(child_object);
MUST(child_object.finish());
}
MUST(node_children.finish());
}
}
void AccessibilityTreeNode::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(*value());
for (auto child : children())
child->visit_edges(visitor);
}
}