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https://github.com/RGBCube/serenity
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LibWeb: Convert Element "attribute change steps" from vector to virtual
By using a virtual function and overriding it on HTMLSlotElement, we shrink every DOM element by 24 bytes. :^)
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commit
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4 changed files with 68 additions and 69 deletions
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@ -71,38 +71,6 @@ Element::Element(Document& document, DOM::QualifiedName qualified_name)
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, m_qualified_name(move(qualified_name))
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{
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make_html_uppercased_qualified_name();
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// https://dom.spec.whatwg.org/#ref-for-concept-element-attributes-change-ext①
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add_attribute_change_steps([this](auto const& local_name, auto const& old_value, auto const& value, auto const& namespace_) {
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// 1. If localName is slot and namespace is null, then:
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if (local_name == HTML::AttributeNames::slot && !namespace_.has_value()) {
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// 1. If value is oldValue, then return.
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if (value == old_value)
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return;
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// 2. If value is null and oldValue is the empty string, then return.
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if (!value.has_value() && old_value == String {})
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return;
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// 3. If value is the empty string and oldValue is null, then return.
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if (value == String {} && !old_value.has_value())
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return;
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// 4. If value is null or the empty string, then set element’s name to the empty string.
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if (!value.has_value() || value->is_empty())
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set_slottable_name({});
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// 5. Otherwise, set element’s name to value.
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else
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set_slottable_name(*value);
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// 6. If element is assigned, then run assign slottables for element’s assigned slot.
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if (auto assigned_slot = assigned_slot_internal())
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assign_slottables(*assigned_slot);
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// 7. Run assign a slot for element.
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assign_a_slot(JS::NonnullGCPtr { *this });
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}
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});
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}
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Element::~Element() = default;
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@ -463,15 +431,9 @@ CSS::CSSStyleDeclaration const* Element::inline_style() const
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return m_inline_style.ptr();
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}
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void Element::add_attribute_change_steps(AttributeChangeSteps steps)
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{
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m_attribute_change_steps.append(move(steps));
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}
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void Element::run_attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
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{
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for (auto const& attribute_change_steps : m_attribute_change_steps)
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attribute_change_steps(local_name, old_value, value, namespace_);
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attribute_change_steps(local_name, old_value, value, namespace_);
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// AD-HOC: Run our own internal attribute change handler.
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attribute_changed(local_name, value);
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@ -2270,4 +2232,37 @@ Element::Directionality Element::directionality() const
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VERIFY_NOT_REACHED();
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}
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// https://dom.spec.whatwg.org/#ref-for-concept-element-attributes-change-ext①
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void Element::attribute_change_steps(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
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{
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// 1. If localName is slot and namespace is null, then:
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if (local_name == HTML::AttributeNames::slot && !namespace_.has_value()) {
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// 1. If value is oldValue, then return.
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if (value == old_value)
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return;
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// 2. If value is null and oldValue is the empty string, then return.
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if (!value.has_value() && old_value == String {})
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return;
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// 3. If value is the empty string and oldValue is null, then return.
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if (value == String {} && !old_value.has_value())
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return;
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// 4. If value is null or the empty string, then set element’s name to the empty string.
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if (!value.has_value() || value->is_empty())
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set_slottable_name({});
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// 5. Otherwise, set element’s name to value.
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else
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set_slottable_name(*value);
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// 6. If element is assigned, then run assign slottables for element’s assigned slot.
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if (auto assigned_slot = assigned_slot_internal())
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assign_slottables(*assigned_slot);
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// 7. Run assign a slot for element.
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assign_a_slot(JS::NonnullGCPtr { *this });
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}
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}
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}
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