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LibWeb/CSS: Implement import at-rule supports conditions

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This indicates the features the browser must support for the given
stylesheet to be fetched.
This commit is contained in:
Tim Ledbetter 2025-03-19 11:23:33 +00:00 • committed by Jelle Raaijmakers
parent d38b5e260e
commit c37a47f76f
Notes: github-actions[bot] 2025-03-19 15:43:58 +00:00
7 changed files with 95 additions and 9 deletions
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25
Libraries/LibWeb/CSS/Parser/RuleParsing.cpp
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@ -161,16 +161,35 @@ GC::Ptr<CSSImportRule> Parser::convert_to_import_rule(AtRule const& rule)
}
tokens.discard_whitespace();
// TODO: Support layers and import-conditions
// FIXME: Implement layer support.
RefPtr<Supports> supports {};
if (tokens.next_token().is_function("supports"sv)) {
auto component_value = tokens.consume_a_token();
TokenStream supports_tokens { component_value.function().value };
if (supports_tokens.next_token().is_block()) {
supports = parse_a_supports(supports_tokens);
} else {
m_rule_context.append(ContextType::SupportsCondition);
auto declaration = consume_a_declaration(supports_tokens);
m_rule_context.take_last();
if (declaration.has_value()) {
auto supports_declaration = Supports::Declaration::create(declaration->to_string(), convert_to_style_property(*declaration).has_value());
supports = Supports::create(supports_declaration.release_nonnull<BooleanExpression>());
}
}
}
// FIXME: Implement media query support.
if (tokens.has_next_token()) {
if constexpr (CSS_PARSER_DEBUG) {
dbgln("Failed to parse @import rule: Trailing tokens after URL are not yet supported.");
dbgln("Failed to parse @import rule:");
tokens.dump_all_tokens();
}
return {};
}
return CSSImportRule::create(url.value(), const_cast<DOM::Document&>(*document()));
return CSSImportRule::create(url.value(), const_cast<DOM::Document&>(*document()), supports);
}
Optional<FlyString> Parser::parse_layer_name(TokenStream<ComponentValue>& tokens, AllowBlankLayerName allow_blank_layer_name)