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df1bb0ff49
Some of the live HTMLCollection only ever contain children of their root node. When we know that's the case, we can avoid doing a full subtree traversal of all descendants and only visit children. This cuts the ECMA262 spec loading time by over 10 seconds. :^)
82 lines
3.3 KiB
C++
82 lines
3.3 KiB
C++
/*
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* Copyright (c) 2021-2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2023, Luke Wilde <lukew@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/DeprecatedFlyString.h>
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#include <AK/Function.h>
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#include <LibJS/Heap/GCPtr.h>
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#include <LibWeb/Bindings/LegacyPlatformObject.h>
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#include <LibWeb/Forward.h>
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namespace Web::DOM {
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// NOTE: HTMLCollection is in the DOM namespace because it's part of the DOM specification.
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// This class implements a live, filtered view of a DOM subtree.
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// When constructing an HTMLCollection, you provide a root node + a filter.
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// The filter is a simple Function object that answers the question
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// "is this Element part of the collection?"
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// FIXME: HTMLCollection currently does no caching. It will re-filter on every access!
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// We should teach it how to cache results. The main challenge is invalidating
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// these caches, since this needs to happen on various kinds of DOM mutation.
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class HTMLCollection : public Bindings::LegacyPlatformObject {
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WEB_PLATFORM_OBJECT(HTMLCollection, Bindings::LegacyPlatformObject);
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public:
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enum class Scope {
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Children,
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Descendants,
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};
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static WebIDL::ExceptionOr<JS::NonnullGCPtr<HTMLCollection>> create(ParentNode& root, Scope, Function<bool(Element const&)> filter);
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virtual ~HTMLCollection() override;
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size_t length();
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Element* item(size_t index) const;
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Element* named_item(DeprecatedFlyString const& name) const;
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JS::MarkedVector<Element*> collect_matching_elements() const;
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virtual WebIDL::ExceptionOr<JS::Value> item_value(size_t index) const override;
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virtual WebIDL::ExceptionOr<JS::Value> named_item_value(DeprecatedFlyString const& name) const override;
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virtual Vector<DeprecatedString> supported_property_names() const override;
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virtual bool is_supported_property_index(u32) const override;
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protected:
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HTMLCollection(ParentNode& root, Scope, Function<bool(Element const&)> filter);
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virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
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JS::NonnullGCPtr<ParentNode> root() { return *m_root; }
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private:
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virtual void visit_edges(Cell::Visitor&) override;
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// ^Bindings::LegacyPlatformObject
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virtual bool supports_indexed_properties() const override { return true; }
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virtual bool supports_named_properties() const override { return true; }
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virtual bool has_indexed_property_setter() const override { return false; }
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virtual bool has_named_property_setter() const override { return false; }
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virtual bool has_named_property_deleter() const override { return false; }
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virtual bool has_legacy_override_built_ins_interface_extended_attribute() const override { return false; }
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virtual bool has_legacy_unenumerable_named_properties_interface_extended_attribute() const override { return true; }
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virtual bool has_global_interface_extended_attribute() const override { return false; }
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virtual bool indexed_property_setter_has_identifier() const override { return false; }
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virtual bool named_property_setter_has_identifier() const override { return false; }
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virtual bool named_property_deleter_has_identifier() const override { return false; }
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JS::NonnullGCPtr<ParentNode> m_root;
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Function<bool(Element const&)> m_filter;
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Scope m_scope { Scope::Descendants };
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};
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}
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