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LibWeb/CSS: Pull out Supports::Declaration parsing

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Avoid repeating this in two places.
This commit is contained in:
Sam Atkins
2025-12-01 12:54:40 +00:00
parent 4ed1c56267
commit faba11f33c
Notes: github-actions[bot] 2025-12-02 09:51:11 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/faba11f33c0
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6986
3 changed files with 22 additions and 11 deletions
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26
Libraries/LibWeb/CSS/Parser/Parser.cpp
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@@ -335,14 +335,9 @@ OwnPtr<BooleanExpression> Parser::parse_supports_feature(TokenStream<ComponentVa
// `<supports-decl> = ( <declaration> )`
if (first_token.is_block() && first_token.block().is_paren()) {
TokenStream block_tokens { first_token.block().value };
// FIXME: Parsing and then converting back to a string is weird.
if (auto declaration = consume_a_declaration(block_tokens); declaration.has_value() && !block_tokens.has_next_token()) {
if (auto declaration = parse_supports_declaration(block_tokens)) {
transaction.commit();
auto supports_declaration = Supports::Declaration::create(
declaration->to_string(),
convert_to_style_property(*declaration).has_value());
return BooleanExpressionInParens::create(supports_declaration.release_nonnull<BooleanExpression>());
return BooleanExpressionInParens::create(declaration.release_nonnull<BooleanExpression>());
}
}
@@ -396,6 +391,23 @@ OwnPtr<BooleanExpression> Parser::parse_supports_feature(TokenStream<ComponentVa
return {};
}
// https://drafts.csswg.org/css-conditional-5/#typedef-supports-decl
OwnPtr<Supports::Declaration> Parser::parse_supports_declaration(TokenStream<ComponentValue>& tokens)
{
// `<supports-decl> = ( <declaration> )`
// NB: Here, we only care about the <declaration> part.
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
if (auto declaration = consume_a_declaration(tokens); declaration.has_value()) {
tokens.discard_whitespace();
if (!tokens.has_next_token()) {
transaction.commit();
return Supports::Declaration::create(declaration->to_string(), convert_to_style_property(*declaration).has_value());
}
}
return {};
}
// https://www.w3.org/TR/mediaqueries-4/#typedef-general-enclosed
OwnPtr<GeneralEnclosed> Parser::parse_general_enclosed(TokenStream<ComponentValue>& tokens, MatchResult result)
{

1
Libraries/LibWeb/CSS/Parser/Parser.h
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@@ -564,6 +564,7 @@ private:
OwnPtr<BooleanExpression> parse_boolean_expression_group(TokenStream<ComponentValue>&, MatchResult result_for_general_enclosed, ParseTest parse_test);
OwnPtr<BooleanExpression> parse_supports_feature(TokenStream<ComponentValue>&);
OwnPtr<Supports::Declaration> parse_supports_declaration(TokenStream<ComponentValue>&);
NonnullRefPtr<StyleValue const> resolve_unresolved_style_value(DOM::AbstractElement, GuardedSubstitutionContexts&, PropertyNameAndID const&, UnresolvedStyleValue const&);

6
Libraries/LibWeb/CSS/Parser/RuleParsing.cpp
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@@ -245,12 +245,10 @@ GC::Ptr<CSSImportRule> Parser::convert_to_import_rule(AtRule const& rule)
supports = parse_a_supports(supports_tokens);
if (!supports) {
m_rule_context.append(RuleContext::SupportsCondition);
auto declaration = consume_a_declaration(supports_tokens);
auto supports_declaration = parse_supports_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());
if (supports_declaration)
supports = Supports::create(supports_declaration.release_nonnull<BooleanExpression>());
}
}
}