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LibWeb: Use HashMap::try_ensure_capacity in StyleComputer

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This commit is contained in:
Thomas Queiroz 2022-12-06 03:08:20 -03:00 • committed by Andreas Kling
parent 6debd967ba
commit eacfcac932
7 changed files with 53 additions and 33 deletions
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17
Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -7,6 +7,7 @@
*/
#include <AK/Debug.h>
#include <AK/Error.h>
#include <AK/HashMap.h>
#include <AK/QuickSort.h>
#include <AK/TemporaryChange.h>
@ -806,7 +807,7 @@ void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& e
}
}
static void cascade_custom_properties(DOM::Element& element, Vector<MatchingRule> const& matching_rules)
static ErrorOr<void> cascade_custom_properties(DOM::Element& element, Vector<MatchingRule> const& matching_rules)
{
size_t needed_capacity = 0;
for (auto const& matching_rule : matching_rules)
@ -815,7 +816,7 @@ static void cascade_custom_properties(DOM::Element& element, Vector<MatchingRule
needed_capacity += inline_style->custom_properties().size();
HashMap<FlyString, StyleProperty> custom_properties;
custom_properties.ensure_capacity(needed_capacity);
TRY(custom_properties.try_ensure_capacity(needed_capacity));
for (auto const& matching_rule : matching_rules) {
for (auto const& it : verify_cast<PropertyOwningCSSStyleDeclaration>(matching_rule.rule->declaration()).custom_properties())
@ -828,10 +829,12 @@ static void cascade_custom_properties(DOM::Element& element, Vector<MatchingRule
}
element.set_custom_properties(move(custom_properties));
return {};
}
// https://www.w3.org/TR/css-cascade/#cascading
void StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
ErrorOr<void> StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
{
// First, we collect all the CSS rules whose selectors match `element`:
MatchingRuleSet matching_rule_set;
@ -843,7 +846,7 @@ void StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element
// Then we resolve all the CSS custom properties ("variables") for this element:
// FIXME: Look into how custom properties should interact with pseudo elements and support that properly.
if (!pseudo_element.has_value())
cascade_custom_properties(element, matching_rule_set.author_rules);
TRY(cascade_custom_properties(element, matching_rule_set.author_rules));
// Then we apply the declarations from the matched rules in cascade order:
@ -869,6 +872,8 @@ void StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element
cascade_declarations(style, element, matching_rule_set.user_agent_rules, CascadeOrigin::UserAgent, Important::Yes);
// FIXME: Transition declarations [css-transitions-1]
return {};
}
static DOM::Element const* element_to_inherit_style_from(DOM::Element const* element, Optional<CSS::Selector::PseudoElement> pseudo_element)
@ -1293,13 +1298,13 @@ NonnullRefPtr<StyleProperties> StyleComputer::create_document_style() const
return style;
}
NonnullRefPtr<StyleProperties> StyleComputer::compute_style(DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
ErrorOr<NonnullRefPtr<StyleProperties>> StyleComputer::compute_style(DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
{
build_rule_cache_if_needed();
auto style = StyleProperties::create();
// 1. Perform the cascade. This produces the "specified style"
compute_cascaded_values(style, element, pseudo_element);
TRY(compute_cascaded_values(style, element, pseudo_element));
// 2. Compute the font, since that may be needed for font-relative CSS units
compute_font(style, &element, pseudo_element);