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LibWeb: Convert Element "attribute change steps" from vector to virtual

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By using a virtual function and overriding it on HTMLSlotElement, we
shrink every DOM element by 24 bytes. :^)
This commit is contained in:
Andreas Kling 2023-11-19 21:28:18 +01:00
parent aa23a7b58d
commit bdac94870c
4 changed files with 68 additions and 69 deletions
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73
Userland/Libraries/LibWeb/DOM/Element.cpp
View file

@ -71,38 +71,6 @@ Element::Element(Document& document, DOM::QualifiedName qualified_name)
, m_qualified_name(move(qualified_name))
{
make_html_uppercased_qualified_name();
// https://dom.spec.whatwg.org/#ref-for-concept-element-attributes-change-ext①
add_attribute_change_steps([this](auto const& local_name, auto const& old_value, auto const& value, auto const& namespace_) {
// 1. If localName is slot and namespace is null, then:
if (local_name == HTML::AttributeNames::slot && !namespace_.has_value()) {
// 1. If value is oldValue, then return.
if (value == old_value)
return;
// 2. If value is null and oldValue is the empty string, then return.
if (!value.has_value() && old_value == String {})
return;
// 3. If value is the empty string and oldValue is null, then return.
if (value == String {} && !old_value.has_value())
return;
// 4. If value is null or the empty string, then set element’s name to the empty string.
if (!value.has_value() || value->is_empty())
set_slottable_name({});
// 5. Otherwise, set element’s name to value.
else
set_slottable_name(*value);
// 6. If element is assigned, then run assign slottables for element’s assigned slot.
if (auto assigned_slot = assigned_slot_internal())
assign_slottables(*assigned_slot);
// 7. Run assign a slot for element.
assign_a_slot(JS::NonnullGCPtr { *this });
}
});
}
Element::~Element() = default;
@ -463,15 +431,9 @@ CSS::CSSStyleDeclaration const* Element::inline_style() const
return m_inline_style.ptr();
}
void Element::add_attribute_change_steps(AttributeChangeSteps steps)
{
m_attribute_change_steps.append(move(steps));
}
void Element::run_attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
{
for (auto const& attribute_change_steps : m_attribute_change_steps)
attribute_change_steps(local_name, old_value, value, namespace_);
attribute_change_steps(local_name, old_value, value, namespace_);
// AD-HOC: Run our own internal attribute change handler.
attribute_changed(local_name, value);
@ -2270,4 +2232,37 @@ Element::Directionality Element::directionality() const
VERIFY_NOT_REACHED();
}
// https://dom.spec.whatwg.org/#ref-for-concept-element-attributes-change-ext①
void Element::attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
{
// 1. If localName is slot and namespace is null, then:
if (local_name == HTML::AttributeNames::slot && !namespace_.has_value()) {
// 1. If value is oldValue, then return.
if (value == old_value)
return;
// 2. If value is null and oldValue is the empty string, then return.
if (!value.has_value() && old_value == String {})
return;
// 3. If value is the empty string and oldValue is null, then return.
if (value == String {} && !old_value.has_value())
return;
// 4. If value is null or the empty string, then set element’s name to the empty string.
if (!value.has_value() || value->is_empty())
set_slottable_name({});
// 5. Otherwise, set element’s name to value.
else
set_slottable_name(*value);
// 6. If element is assigned, then run assign slottables for element’s assigned slot.
if (auto assigned_slot = assigned_slot_internal())
assign_slottables(*assigned_slot);
// 7. Run assign a slot for element.
assign_a_slot(JS::NonnullGCPtr { *this });
}
}
}

4
Userland/Libraries/LibWeb/DOM/Element.h
View file

@ -147,9 +147,8 @@ public:
virtual void apply_presentational_hints(CSS::StyleProperties&) const { }
// https://dom.spec.whatwg.org/#concept-element-attributes-change-ext
using AttributeChangeSteps = Function<void(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)>;
virtual void attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_);
void add_attribute_change_steps(AttributeChangeSteps steps);
void run_attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_);
virtual void attribute_changed(FlyString const& name, Optional<String> const& value);
@ -395,7 +394,6 @@ private:
FlyString m_html_uppercased_qualified_name;
JS::GCPtr<NamedNodeMap> m_attributes;
Vector<AttributeChangeSteps> m_attribute_change_steps;
JS::GCPtr<CSS::ElementInlineCSSStyleDeclaration> m_inline_style;
JS::GCPtr<DOMTokenList> m_class_list;
JS::GCPtr<ShadowRoot> m_shadow_root;

58
Userland/Libraries/LibWeb/HTML/HTMLSlotElement.cpp
View file

@ -17,33 +17,6 @@ JS_DEFINE_ALLOCATOR(HTMLSlotElement);
HTMLSlotElement::HTMLSlotElement(DOM::Document& document, DOM::QualifiedName qualified_name)
: HTMLElement(document, move(qualified_name))
{
// https://dom.spec.whatwg.org/#ref-for-concept-element-attributes-change-ext
add_attribute_change_steps([this](auto const& local_name, auto const& old_value, auto const& value, auto const& namespace_) {
// 1. If element is a slot, localName is name, and namespace is null, then:
if (local_name == AttributeNames::name && !namespace_.has_value()) {
// 1. If value is oldValue, then return.
if (value == old_value)
return;
// 2. If value is null and oldValue is the empty string, then return.
if (!value.has_value() && old_value == String {})
return;
// 3. If value is the empty string and oldValue is null, then return.
if (value == String {} && !old_value.has_value())
return;
// 4. If value is null or the empty string, then set element’s name to the empty string.
if (!value.has_value())
set_slot_name({});
// 5. Otherwise, set element’s name to value.
else
set_slot_name(*value);
// 6. Run assign slottables for a tree with element’s root.
DOM::assign_slottables_for_a_tree(root());
}
});
}
HTMLSlotElement::~HTMLSlotElement() = default;
@ -142,4 +115,35 @@ void HTMLSlotElement::assign(Vector<SlottableHandle> nodes)
assign_slottables_for_a_tree(root());
}
// https://dom.spec.whatwg.org/#ref-for-concept-element-attributes-change-ext
void HTMLSlotElement::attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
{
Base::attribute_change_steps(local_name, old_value, value, namespace_);
// 1. If element is a slot, localName is name, and namespace is null, then:
if (local_name == AttributeNames::name && !namespace_.has_value()) {
// 1. If value is oldValue, then return.
if (value == old_value)
return;
// 2. If value is null and oldValue is the empty string, then return.
if (!value.has_value() && old_value == String {})
return;
// 3. If value is the empty string and oldValue is null, then return.
if (value == String {} && !old_value.has_value())
return;
// 4. If value is null or the empty string, then set element’s name to the empty string.
if (!value.has_value())
set_slot_name({});
// 5. Otherwise, set element’s name to value.
else
set_slot_name(*value);
// 6. Run assign slottables for a tree with element’s root.
DOM::assign_slottables_for_a_tree(root());
}
}
}

2
Userland/Libraries/LibWeb/HTML/HTMLSlotElement.h
View file

@ -45,6 +45,8 @@ private:
virtual void initialize(JS::Realm&) override;
virtual void visit_edges(JS::Cell::Visitor&) override;
virtual void attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
// https://html.spec.whatwg.org/multipage/scripting.html#manually-assigned-nodes
Vector<DOM::Slottable> m_manually_assigned_nodes;
};