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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
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@ -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 });
}
}
}