43ef3dc0ab
When matching a CSS attribute selector against an HTML element, the attribute name is case-insensitive. Before this change, that meant we had to call equals_ignoring_ascii_case() on all the attribute names. We now cache the attribute name lowercased on each Attr node, which allows us to do FlyString-to-FlyString comparison (simple pointer comparison). This brings attribute selector matching from 6% to <1% when loading our GitHub repo at https://github.com/SerenityOS/serenity
63 lines
2 KiB
C++
63 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2021, 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/WeakPtr.h>
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/DOM/QualifiedName.h>
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namespace Web::DOM {
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// https://dom.spec.whatwg.org/#attr
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class Attr final : public Node {
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WEB_PLATFORM_OBJECT(Attr, Node);
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JS_DECLARE_ALLOCATOR(Attr);
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public:
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[[nodiscard]] static JS::NonnullGCPtr<Attr> create(Document&, QualifiedName, String value = {}, Element* = nullptr);
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[[nodiscard]] static JS::NonnullGCPtr<Attr> create(Document&, FlyString local_name, String value = {}, Element* = nullptr);
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JS::NonnullGCPtr<Attr> clone(Document&);
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virtual ~Attr() override = default;
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virtual FlyString node_name() const override { return name(); }
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Optional<FlyString> const& namespace_uri() const { return m_qualified_name.namespace_(); }
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Optional<FlyString> const& prefix() const { return m_qualified_name.prefix(); }
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FlyString const& local_name() const { return m_qualified_name.local_name(); }
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FlyString const& name() const { return m_qualified_name.as_string(); }
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FlyString const& lowercase_name() const { return m_lowercase_name; }
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String const& value() const { return m_value; }
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void set_value(String value);
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void change_attribute(String value);
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Element* owner_element();
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Element const* owner_element() const;
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void set_owner_element(Element* owner_element);
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// Always returns true: https://dom.spec.whatwg.org/#dom-attr-specified
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constexpr bool specified() const { return true; }
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void handle_attribute_changes(Element&, Optional<String> const& old_value, Optional<String> const& new_value);
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private:
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Attr(Document&, QualifiedName, String value, Element*);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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QualifiedName m_qualified_name;
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FlyString m_lowercase_name;
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String m_value;
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JS::GCPtr<Element> m_owner_element;
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};
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template<>
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inline bool Node::fast_is<Attr>() const { return is_attribute(); }
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}
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