bfd354492e
With this change, we now have ~1200 CellAllocators across both LibJS and LibWeb in a normal WebContent instance. This gives us a minimum heap size of 4.7 MiB in the scenario where we only have one cell allocated per type. Of course, in practice there will be many more of each type, so the effective overhead is quite a bit smaller than that in practice. I left a few types unconverted to this mechanism because I got tired of doing this. :^)
81 lines
3.3 KiB
C++
81 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/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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JS_DECLARE_ALLOCATOR(HTMLCollection);
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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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[[nodiscard]] static 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() const;
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Element* item(size_t index) const;
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Element* named_item(FlyString 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(FlyString 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 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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