mirror of
https://github.com/RGBCube/serenity
synced 2025-05-25 22:45:06 +00:00
2692db8699
Note that as of this commit, there aren't any such throwers, and the call site in Heap::allocate will drop exceptions on the floor. This commit only serves to change the declaration of the overrides, make sure they return an empty value, and to propagate OOM errors frm their base initialize invocations.
75 lines
2.2 KiB
C++
75 lines
2.2 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 <LibWeb/DOM/NodeFilter.h>
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namespace Web::DOM {
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// https://dom.spec.whatwg.org/#treewalker
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class TreeWalker final : public Bindings::PlatformObject {
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WEB_PLATFORM_OBJECT(TreeWalker, Bindings::PlatformObject);
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public:
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static JS::NonnullGCPtr<TreeWalker> create(Node& root, unsigned what_to_show, JS::GCPtr<NodeFilter>);
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virtual ~TreeWalker() override;
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JS::NonnullGCPtr<Node> current_node() const;
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void set_current_node(Node&);
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JS::ThrowCompletionOr<JS::GCPtr<Node>> parent_node();
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JS::ThrowCompletionOr<JS::GCPtr<Node>> first_child();
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JS::ThrowCompletionOr<JS::GCPtr<Node>> last_child();
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JS::ThrowCompletionOr<JS::GCPtr<Node>> previous_sibling();
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JS::ThrowCompletionOr<JS::GCPtr<Node>> next_sibling();
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JS::ThrowCompletionOr<JS::GCPtr<Node>> previous_node();
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JS::ThrowCompletionOr<JS::GCPtr<Node>> next_node();
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JS::NonnullGCPtr<Node> root() { return m_root; }
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NodeFilter* filter() { return m_filter.ptr(); }
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unsigned what_to_show() const { return m_what_to_show; }
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private:
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explicit TreeWalker(Node& root);
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virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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enum class ChildTraversalType {
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First,
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Last,
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};
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JS::ThrowCompletionOr<JS::GCPtr<Node>> traverse_children(ChildTraversalType);
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enum class SiblingTraversalType {
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Next,
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Previous,
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};
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JS::ThrowCompletionOr<JS::GCPtr<Node>> traverse_siblings(SiblingTraversalType);
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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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// https://dom.spec.whatwg.org/#treewalker-current
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JS::NonnullGCPtr<Node> m_current;
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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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