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c37820b898
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
75 lines
2.1 KiB
C++
75 lines
2.1 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 <AK/RefCounted.h>
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#include <LibWeb/Bindings/Wrappable.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/#treewalker
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class TreeWalker
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: public RefCounted<TreeWalker>
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, public Bindings::Wrappable {
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public:
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using WrapperType = Bindings::TreeWalkerWrapper;
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static NonnullRefPtr<TreeWalker> create(Node& root, unsigned what_to_show, RefPtr<NodeFilter>);
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virtual ~TreeWalker() override = default;
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NonnullRefPtr<Node> current_node() const;
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void set_current_node(Node&);
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JS::ThrowCompletionOr<RefPtr<Node>> parent_node();
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JS::ThrowCompletionOr<RefPtr<Node>> first_child();
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JS::ThrowCompletionOr<RefPtr<Node>> last_child();
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JS::ThrowCompletionOr<RefPtr<Node>> previous_sibling();
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JS::ThrowCompletionOr<RefPtr<Node>> next_sibling();
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JS::ThrowCompletionOr<RefPtr<Node>> previous_node();
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JS::ThrowCompletionOr<RefPtr<Node>> next_node();
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NonnullRefPtr<Node> root() { return m_root; }
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NodeFilter* filter() { return m_filter; }
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unsigned what_to_show() const { return m_what_to_show; }
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private:
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TreeWalker(Node& root);
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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<RefPtr<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<RefPtr<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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NonnullRefPtr<DOM::Node> m_root;
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// https://dom.spec.whatwg.org/#treewalker-current
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NonnullRefPtr<DOM::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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RefPtr<DOM::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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