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LibWeb/CSS: Align declaration block parsing with the spec

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We have two different code paths that implement the "parse a CSS
declaration block" algorithm, for properties and descriptors. COmbining
them isn't straightforward, and doesn't seem especially useful.
This commit is contained in:
Sam Atkins 2025-04-14 15:26:43 +01:00
parent 8a20899382
commit fa8bbfa6a5
Notes: github-actions[bot] 2025-04-23 10:40:21 +00:00
5 changed files with 52 additions and 38 deletions
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69
Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -1337,7 +1337,8 @@ Vector<Vector<ComponentValue>> Parser::parse_a_comma_separated_list_of_component
return groups;
}
Parser::PropertiesAndCustomProperties Parser::parse_as_style_attribute()
// https://drafts.csswg.org/cssom/#parse-a-css-declaration-block
Parser::PropertiesAndCustomProperties Parser::parse_as_property_declaration_block()
{
auto expand_shorthands = [&](Vector<StyleProperty>& properties) -> Vector<StyleProperty> {
Vector<StyleProperty> expanded_properties;
@ -1357,16 +1358,36 @@ Parser::PropertiesAndCustomProperties Parser::parse_as_style_attribute()
return expanded_properties;
};
// 1. Let declarations be the returned declarations from invoking parse a block’s contents with string.
m_rule_context.append(ContextType::Style);
auto declarations_and_at_rules = parse_a_blocks_contents(m_token_stream);
m_rule_context.take_last();
auto properties = extract_properties(declarations_and_at_rules);
properties.properties = expand_shorthands(properties.properties);
return properties;
// 2. Let parsed declarations be a new empty list.
PropertiesAndCustomProperties parsed_declarations;
// 3. For each item declaration in declarations, follow these substeps:
for (auto const& rule_or_list : declarations_and_at_rules) {
if (rule_or_list.has<Rule>())
continue;
auto& rule_declarations = rule_or_list.get<Vector<Declaration>>();
for (auto const& declaration : rule_declarations) {
// 1. Let parsed declaration be the result of parsing declaration according to the appropriate CSS
// specifications, dropping parts that are said to be ignored. If the whole declaration is dropped, let
// parsed declaration be null.
// 2. If parsed declaration is not null, append it to parsed declarations.
extract_property(declaration, parsed_declarations);
}
}
parsed_declarations.properties = expand_shorthands(parsed_declarations.properties);
// 4. Return parsed declarations.
return parsed_declarations;
}
Vector<Descriptor> Parser::parse_as_list_of_descriptors(AtRuleID at_rule_id)
// https://drafts.csswg.org/cssom/#parse-a-css-declaration-block
Vector<Descriptor> Parser::parse_as_descriptor_declaration_block(AtRuleID at_rule_id)
{
auto context_type = [at_rule_id] {
switch (at_rule_id) {
@ -1378,22 +1399,32 @@ Vector<Descriptor> Parser::parse_as_list_of_descriptors(AtRuleID at_rule_id)
VERIFY_NOT_REACHED();
}();
// 1. Let declarations be the returned declarations from invoking parse a block’s contents with string.
m_rule_context.append(context_type);
auto declarations_and_at_rules = parse_a_blocks_contents(m_token_stream);
m_rule_context.take_last();
Vector<Descriptor> descriptors;
// 2. Let parsed declarations be a new empty list.
Vector<Descriptor> parsed_declarations;
// 3. For each item declaration in declarations, follow these substeps:
for (auto const& rule_or_list : declarations_and_at_rules) {
if (rule_or_list.has<Rule>())
continue;
auto& declarations = rule_or_list.get<Vector<Declaration>>();
for (auto const& declaration : declarations) {
if (auto descriptor = convert_to_descriptor(at_rule_id, declaration); descriptor.has_value())
descriptors.append(descriptor.release_value());
auto& rule_declarations = rule_or_list.get<Vector<Declaration>>();
for (auto const& declaration : rule_declarations) {
// 1. Let parsed declaration be the result of parsing declaration according to the appropriate CSS
// specifications, dropping parts that are said to be ignored. If the whole declaration is dropped, let
// parsed declaration be null.
// 2. If parsed declaration is not null, append it to parsed declarations.
if (auto parsed_declaration = convert_to_descriptor(at_rule_id, declaration); parsed_declaration.has_value())
parsed_declarations.append(parsed_declaration.release_value());
}
}
return descriptors;
// 4. Return parsed declarations.
return parsed_declarations;
}
bool Parser::is_valid_in_the_current_context(Declaration const&) const
@ -1518,22 +1549,6 @@ bool Parser::is_valid_in_the_current_context(QualifiedRule const&) const
VERIFY_NOT_REACHED();
}
Parser::PropertiesAndCustomProperties Parser::extract_properties(Vector<RuleOrListOfDeclarations> const& rules_and_lists_of_declarations)
{
PropertiesAndCustomProperties result;
for (auto const& rule_or_list : rules_and_lists_of_declarations) {
if (rule_or_list.has<Rule>())
continue;
auto& declarations = rule_or_list.get<Vector<Declaration>>();
PropertiesAndCustomProperties& dest = result;
for (auto const& declaration : declarations) {
extract_property(declaration, dest);
}
}
return result;
}
void Parser::extract_property(Declaration const& declaration, PropertiesAndCustomProperties& dest)
{
if (auto maybe_property = convert_to_style_property(declaration); maybe_property.has_value()) {