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LibWeb: Let Element cache its list of classes

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Instead of string splitting every time you call Element::has_class(),
we now split the "class" attribute value when it changes, and cache
the individual classes as FlyStrings in Element::m_classes.

This makes has_class() significantly faster and moves the pain point
of selector matching somewhere else.
This commit is contained in:
Andreas Kling 2020-05-26 23:07:19 +02:00
parent 16accb71a3
commit 5069d380a8
2 changed files with 15 additions and 9 deletions
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20
Libraries/LibWeb/DOM/Element.cpp
View file

@ -97,14 +97,10 @@ void Element::set_attributes(Vector<Attribute>&& attributes)
parse_attribute(attribute.name(), attribute.value());
}
bool Element::has_class(const StringView& class_name) const
bool Element::has_class(const FlyString& class_name) const
{
auto value = attribute("class");
if (value.is_empty())
return false;
auto parts = value.split_view(' ');
for (auto& part : parts) {
if (part == class_name)
for (auto& class_ : m_classes) {
if (class_ == class_name)
return true;
}
return false;
@ -140,8 +136,16 @@ RefPtr<LayoutNode> Element::create_layout_node(const StyleProperties* parent_sty
return adopt(*new LayoutInline(*this, move(style)));
}
void Element::parse_attribute(const FlyString&, const String&)
void Element::parse_attribute(const FlyString& name, const String& value)
{
if (name == "class") {
auto new_classes = value.split_view(' ');
m_classes.clear();
m_classes.ensure_capacity(new_classes.size());
for (auto& new_class : new_classes) {
m_classes.unchecked_append(new_class);
}
}
}
enum class StyleDifference {