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/*
* Copyright (c) 2021-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/DeprecatedFlyString.h>
#include <AK/Function.h>
#include <LibJS/Heap/GCPtr.h>
#include <LibWeb/Bindings/LegacyPlatformObject.h>
#include <LibWeb/Forward.h>
namespace Web::DOM {
// NOTE: HTMLCollection is in the DOM namespace because it's part of the DOM specification.
// This class implements a live, filtered view of a DOM subtree.
// When constructing an HTMLCollection, you provide a root node + a filter.
// The filter is a simple Function object that answers the question
// "is this Element part of the collection?"
// FIXME: HTMLCollection currently does no caching. It will re-filter on every access!
// We should teach it how to cache results. The main challenge is invalidating
// these caches, since this needs to happen on various kinds of DOM mutation.
class HTMLCollection : public Bindings::LegacyPlatformObject {
WEB_PLATFORM_OBJECT(HTMLCollection, Bindings::LegacyPlatformObject);
public:
static WebIDL::ExceptionOr<JS::NonnullGCPtr<HTMLCollection>> create(ParentNode& root, Function<bool(Element const&)> filter);
virtual ~HTMLCollection() override;
size_t length();
Element* item(size_t index) const;
Element* named_item(DeprecatedFlyString const& name) const;
JS::MarkedVector<Element*> collect_matching_elements() const;
virtual JS::Value item_value(size_t index) const override;
virtual JS::Value named_item_value(DeprecatedFlyString const& name) const override;
virtual Vector<DeprecatedString> supported_property_names() const override;
virtual bool is_supported_property_index(u32) const override;
protected:
HTMLCollection(ParentNode& root, Function<bool(Element const&)> filter);
virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
JS::NonnullGCPtr<ParentNode> root() { return *m_root; }
private:
virtual void visit_edges(Cell::Visitor&) override;
JS::NonnullGCPtr<ParentNode> m_root;
Function<bool(Element const&)> m_filter;
};
}
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