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eda566d112
It's potentially unsafe to access `m_root` in the destructor since it may have been swept, so move unregistration of the NodeIterator into a GC finalizer instead.
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Runtime/Object.h>
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#include <LibWeb/DOM/NodeFilter.h>
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namespace Web::DOM {
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// https://dom.spec.whatwg.org/#nodeiterator
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class NodeIterator final : public Bindings::PlatformObject {
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WEB_PLATFORM_OBJECT(NodeIterator, Bindings::PlatformObject);
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public:
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static JS::NonnullGCPtr<NodeIterator> create(Node& root, unsigned what_to_show, JS::GCPtr<NodeFilter>);
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virtual ~NodeIterator() override;
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JS::NonnullGCPtr<Node> root() { return m_root; }
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JS::NonnullGCPtr<Node> reference_node() { return m_reference.node; }
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bool pointer_before_reference_node() const { return m_reference.is_before_node; }
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unsigned what_to_show() const { return m_what_to_show; }
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NodeFilter* filter() { return m_filter.ptr(); }
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JS::ThrowCompletionOr<JS::GCPtr<Node>> next_node();
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JS::ThrowCompletionOr<JS::GCPtr<Node>> previous_node();
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void detach();
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void run_pre_removing_steps(Node&);
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private:
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explicit NodeIterator(Node& root);
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virtual void visit_edges(Cell::Visitor&) override;
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virtual void finalize() override;
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enum class Direction {
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Next,
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Previous,
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};
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JS::ThrowCompletionOr<JS::GCPtr<Node>> traverse(Direction);
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JS::ThrowCompletionOr<NodeFilter::Result> filter(Node&);
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// https://dom.spec.whatwg.org/#concept-traversal-root
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JS::NonnullGCPtr<Node> m_root;
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struct NodePointer {
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JS::NonnullGCPtr<Node> node;
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// https://dom.spec.whatwg.org/#nodeiterator-pointer-before-reference
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bool is_before_node { true };
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};
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void run_pre_removing_steps_with_node_pointer(Node&, NodePointer&);
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// https://dom.spec.whatwg.org/#nodeiterator-reference
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NodePointer m_reference;
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// While traversal is ongoing, we keep track of the current node pointer.
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// This allows us to adjust it during traversal if calling the filter ends up removing the node from the DOM.
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Optional<NodePointer> m_traversal_pointer;
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// https://dom.spec.whatwg.org/#concept-traversal-whattoshow
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unsigned m_what_to_show { 0 };
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// https://dom.spec.whatwg.org/#concept-traversal-filter
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JS::GCPtr<NodeFilter> m_filter;
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// https://dom.spec.whatwg.org/#concept-traversal-active
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bool m_active { false };
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};
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}
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