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LibWeb: Streamline how inline CSS style declarations are constructed

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When parsing the "style" attribute on elements, we'd previously ask the
CSS parser for a PropertyOwningCSSStyleDeclaration. Then we'd create a
new ElementCSSInlineStyleDeclaration and transfer the properties from
the first object to the second object.

This patch teaches the parser to make ElementCSSInlineStyleDeclaration
objects directly.
This commit is contained in:
Andreas Kling 2022-03-29 16:01:38 +02:00
parent 3efa6cedec
commit 427beb97b5
5 changed files with 34 additions and 36 deletions
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10
Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
View file

@ -23,14 +23,8 @@ String PropertyOwningCSSStyleDeclaration::item(size_t index) const
return CSS::string_from_property_id(m_properties[index].property_id);
}
ElementInlineCSSStyleDeclaration::ElementInlineCSSStyleDeclaration(DOM::Element& element)
: PropertyOwningCSSStyleDeclaration({}, {})
, m_element(element.make_weak_ptr<DOM::Element>())
{
}
ElementInlineCSSStyleDeclaration::ElementInlineCSSStyleDeclaration(DOM::Element& element, PropertyOwningCSSStyleDeclaration& declaration)
: PropertyOwningCSSStyleDeclaration(move(declaration.m_properties), move(declaration.m_custom_properties))
ElementInlineCSSStyleDeclaration::ElementInlineCSSStyleDeclaration(DOM::Element& element, Vector<StyleProperty> properties, HashMap<String, StyleProperty> custom_properties)
: PropertyOwningCSSStyleDeclaration(move(properties), move(custom_properties))
, m_element(element.make_weak_ptr<DOM::Element>())
{
}

6
Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
View file

@ -86,16 +86,14 @@ private:
class ElementInlineCSSStyleDeclaration final : public PropertyOwningCSSStyleDeclaration {
public:
static NonnullRefPtr<ElementInlineCSSStyleDeclaration> create(DOM::Element& element) { return adopt_ref(*new ElementInlineCSSStyleDeclaration(element)); }
static NonnullRefPtr<ElementInlineCSSStyleDeclaration> create_and_take_properties_from(DOM::Element& element, PropertyOwningCSSStyleDeclaration& declaration) { return adopt_ref(*new ElementInlineCSSStyleDeclaration(element, declaration)); }
static NonnullRefPtr<ElementInlineCSSStyleDeclaration> create(DOM::Element& element, Vector<StyleProperty> properties, HashMap<String, StyleProperty> custom_properties) { return adopt_ref(*new ElementInlineCSSStyleDeclaration(element, move(properties), move(custom_properties))); }
virtual ~ElementInlineCSSStyleDeclaration() override = default;
DOM::Element* element() { return m_element.ptr(); }
const DOM::Element* element() const { return m_element.ptr(); }
private:
explicit ElementInlineCSSStyleDeclaration(DOM::Element&);
explicit ElementInlineCSSStyleDeclaration(DOM::Element&, PropertyOwningCSSStyleDeclaration&);
explicit ElementInlineCSSStyleDeclaration(DOM::Element&, Vector<StyleProperty> properties, HashMap<String, StyleProperty> custom_properties);
WeakPtr<DOM::Element> m_element;
};

34
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
View file

@ -1997,10 +1997,11 @@ Vector<Vector<StyleComponentValueRule>> Parser::parse_a_comma_separated_list_of_
return lists;
}
RefPtr<PropertyOwningCSSStyleDeclaration> Parser::parse_as_style_attribute()
RefPtr<ElementInlineCSSStyleDeclaration> Parser::parse_as_style_attribute(DOM::Element& element)
{
auto declarations_and_at_rules = parse_a_list_of_declarations(m_token_stream);
return convert_to_style_declaration(declarations_and_at_rules);
auto [properties, custom_properties] = extract_properties(declarations_and_at_rules);
return ElementInlineCSSStyleDeclaration::create(element, move(properties), move(custom_properties));
}
Optional<AK::URL> Parser::parse_url_function(StyleComponentValueRule const& component_value, AllowedDataUrlType allowed_data_url_type)
@ -2169,30 +2170,32 @@ RefPtr<CSSRule> Parser::convert_to_rule(NonnullRefPtr<StyleRule> rule)
return {};
}
RefPtr<PropertyOwningCSSStyleDeclaration> Parser::convert_to_style_declaration(Vector<DeclarationOrAtRule> declarations_and_at_rules)
auto Parser::extract_properties(Vector<DeclarationOrAtRule> const& declarations_and_at_rules) -> PropertiesAndCustomProperties
{
Vector<StyleProperty> properties;
HashMap<String, StyleProperty> custom_properties;
PropertiesAndCustomProperties result;
for (auto& declaration_or_at_rule : declarations_and_at_rules) {
if (declaration_or_at_rule.is_at_rule()) {
dbgln_if(CSS_PARSER_DEBUG, "!!! CSS at-rule is not allowed here!");
continue;
}
auto& declaration = declaration_or_at_rule.m_declaration;
auto const& declaration = declaration_or_at_rule.declaration();
auto maybe_property = convert_to_style_property(declaration);
if (maybe_property.has_value()) {
auto property = maybe_property.value();
if (auto maybe_property = convert_to_style_property(declaration); maybe_property.has_value()) {
auto property = maybe_property.release_value();
if (property.property_id == PropertyID::Custom) {
custom_properties.set(property.custom_name, property);
result.custom_properties.set(property.custom_name, property);
} else {
properties.append(property);
result.properties.append(move(property));
}
}
}
return result;
}
RefPtr<PropertyOwningCSSStyleDeclaration> Parser::convert_to_style_declaration(Vector<DeclarationOrAtRule> declarations_and_at_rules)
{
auto [properties, custom_properties] = extract_properties(declarations_and_at_rules);
return PropertyOwningCSSStyleDeclaration::create(move(properties), move(custom_properties));
}
@ -5206,13 +5209,12 @@ RefPtr<CSS::CSSStyleSheet> parse_css(CSS::ParsingContext const& context, StringV
return parser.parse_as_stylesheet();
}
RefPtr<CSS::PropertyOwningCSSStyleDeclaration> parse_css_style_attribute(CSS::ParsingContext const& context, StringView css)
RefPtr<CSS::ElementInlineCSSStyleDeclaration> parse_css_style_attribute(CSS::ParsingContext const& context, StringView css, DOM::Element& element)
{
// FIXME: We could save some effort by creating an ElementInlineCSSStyleDeclaration right here.
if (css.is_empty())
return CSS::PropertyOwningCSSStyleDeclaration::create({}, {});
return CSS::ElementInlineCSSStyleDeclaration::create(element, {}, {});
CSS::Parser parser(context, css);
return parser.parse_as_style_attribute();
return parser.parse_as_style_attribute(element);
}
RefPtr<CSS::StyleValue> parse_css_value(CSS::ParsingContext const& context, StringView string, CSS::PropertyID property_id)

11
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
View file

@ -105,7 +105,7 @@ public:
Vector<StyleComponentValueRule> parse_as_list_of_component_values();
Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values();
RefPtr<PropertyOwningCSSStyleDeclaration> parse_as_style_attribute();
RefPtr<ElementInlineCSSStyleDeclaration> parse_as_style_attribute(DOM::Element&);
enum class SelectorParsingMode {
Standard,
@ -343,6 +343,13 @@ private:
static bool has_ignored_vendor_prefix(StringView);
static bool is_builtin(StringView);
struct PropertiesAndCustomProperties {
Vector<StyleProperty> properties;
HashMap<String, StyleProperty> custom_properties;
};
PropertiesAndCustomProperties extract_properties(Vector<DeclarationOrAtRule> const&);
ParsingContext m_context;
Tokenizer m_tokenizer;
@ -355,7 +362,7 @@ private:
namespace Web {
RefPtr<CSS::CSSStyleSheet> parse_css(CSS::ParsingContext const&, StringView);
RefPtr<CSS::PropertyOwningCSSStyleDeclaration> parse_css_style_attribute(CSS::ParsingContext const&, StringView);
RefPtr<CSS::ElementInlineCSSStyleDeclaration> parse_css_style_attribute(CSS::ParsingContext const&, StringView, DOM::Element&);
RefPtr<CSS::StyleValue> parse_css_value(CSS::ParsingContext const&, StringView, CSS::PropertyID property_id = CSS::PropertyID::Invalid);
Optional<CSS::SelectorList> parse_selector(CSS::ParsingContext const&, StringView);
RefPtr<CSS::CSSRule> parse_css_rule(CSS::ParsingContext const&, StringView);

9
Userland/Libraries/LibWeb/DOM/Element.cpp
View file

@ -255,11 +255,8 @@ void Element::parse_attribute(const FlyString& name, const String& value)
if (m_class_list)
m_class_list->associated_attribute_changed(value);
} else if (name == HTML::AttributeNames::style) {
auto parsed_style = parse_css_style_attribute(CSS::ParsingContext(document()), value);
if (!parsed_style.is_null()) {
m_inline_style = CSS::ElementInlineCSSStyleDeclaration::create_and_take_properties_from(*this, parsed_style.release_nonnull());
set_needs_style_update(true);
}
m_inline_style = parse_css_style_attribute(CSS::ParsingContext(document()), value, *this);
set_needs_style_update(true);
}
}
@ -452,7 +449,7 @@ void Element::set_shadow_root(RefPtr<ShadowRoot> shadow_root)
NonnullRefPtr<CSS::CSSStyleDeclaration> Element::style_for_bindings()
{
if (!m_inline_style)
m_inline_style = CSS::ElementInlineCSSStyleDeclaration::create(*this);
m_inline_style = CSS::ElementInlineCSSStyleDeclaration::create(*this, {}, {});
return *m_inline_style;
}