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LibWeb: Make TreeWalker GC-allocated

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This commit is contained in:
Andreas Kling 2022-08-08 23:03:27 +02:00
parent bd629c45b5
commit a4ddb0ef87
7 changed files with 41 additions and 30 deletions
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33
Userland/Libraries/LibWeb/DOM/TreeWalker.cpp
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@ -8,6 +8,7 @@
#include <LibWeb/Bindings/IDLAbstractOperations.h>
#include <LibWeb/Bindings/NodeWrapper.h>
#include <LibWeb/Bindings/NodeWrapperFactory.h>
#include <LibWeb/Bindings/TreeWalkerPrototype.h>
#include <LibWeb/Bindings/Wrapper.h>
#include <LibWeb/DOM/DOMException.h>
#include <LibWeb/DOM/Node.h>
@ -17,26 +18,36 @@
namespace Web::DOM {
TreeWalker::TreeWalker(Node& root)
: m_root(root)
: PlatformObject(root.document().preferred_window_object().ensure_web_prototype<Bindings::TreeWalkerPrototype>("TreeWalker"))
, m_root(root)
, m_current(root)
{
}
TreeWalker::~TreeWalker() = default;
void TreeWalker::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_filter.ptr());
}
// https://dom.spec.whatwg.org/#dom-document-createtreewalker
NonnullRefPtr<TreeWalker> TreeWalker::create(Node& root, unsigned what_to_show, NodeFilter* filter)
JS::NonnullGCPtr<TreeWalker> TreeWalker::create(Node& root, unsigned what_to_show, JS::GCPtr<NodeFilter> filter)
{
// 1. Let walker be a new TreeWalker object.
// 2. Set walker’s root and walker’s current to root.
auto walker = adopt_ref(*new TreeWalker(root));
auto& window_object = root.document().preferred_window_object();
auto* walker = window_object.heap().allocate<TreeWalker>(window_object.realm(), root);
// 3. Set walker’s whatToShow to whatToShow.
walker->m_what_to_show = what_to_show;
// 4. Set walker’s filter to filter.
walker->m_filter = JS::make_handle(filter);
walker->m_filter = filter;
// 5. Return walker.
return walker;
return *walker;
}
// https://dom.spec.whatwg.org/#dom-treewalker-currentnode
@ -220,13 +231,9 @@ JS::ThrowCompletionOr<RefPtr<Node>> TreeWalker::next_node()
// https://dom.spec.whatwg.org/#concept-node-filter
JS::ThrowCompletionOr<NodeFilter::Result> TreeWalker::filter(Node& node)
{
VERIFY(wrapper());
auto& vm = wrapper()->vm();
auto& realm = *vm.current_realm();
// 1. If traverser’s active flag is set, then throw an "InvalidStateError" DOMException.
if (m_active)
return JS::throw_completion(wrap(realm, InvalidStateError::create("NodeIterator is already active")));
return JS::throw_completion(wrap(shape().realm(), InvalidStateError::create("NodeIterator is already active")));
// 2. Let n be node’s nodeType attribute value − 1.
auto n = node.node_type() - 1;
@ -236,7 +243,7 @@ JS::ThrowCompletionOr<NodeFilter::Result> TreeWalker::filter(Node& node)
return NodeFilter::FILTER_SKIP;
// 4. If traverser’s filter is null, then return FILTER_ACCEPT.
if (!m_filter.cell())
if (!m_filter)
return NodeFilter::FILTER_ACCEPT;
// 5. Set traverser’s active flag.
@ -244,7 +251,7 @@ JS::ThrowCompletionOr<NodeFilter::Result> TreeWalker::filter(Node& node)
// 6. Let result be the return value of call a user object’s operation with traverser’s filter, "acceptNode", and « node ».
// If this throws an exception, then unset traverser’s active flag and rethrow the exception.
auto result = Bindings::IDL::call_user_object_operation(m_filter->callback(), "acceptNode", {}, wrap(realm, node));
auto result = Bindings::IDL::call_user_object_operation(m_filter->callback(), "acceptNode", {}, wrap(shape().realm(), node));
if (result.is_abrupt()) {
m_active = false;
return result;
@ -254,7 +261,7 @@ JS::ThrowCompletionOr<NodeFilter::Result> TreeWalker::filter(Node& node)
m_active = false;
// 8. Return result.
auto result_value = TRY(result.value()->to_i32(vm));
auto result_value = TRY(result.value()->to_i32(vm()));
return static_cast<NodeFilter::Result>(result_value);
}