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