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LibWeb/CSS: Split out <family-name> parsing

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This type is used individually elsewhere in the spec. This also lets us
separate out the `<generic-family>` type.
This commit is contained in:
Sam Atkins 2025-03-24 16:43:47 +00:00 • committed by Andreas Kling
parent 2e5e5d3816
commit f8536fc48a
Notes: github-actions[bot] 2025-03-25 07:55:06 +00:00
3 changed files with 70 additions and 64 deletions
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49
Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
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@ -311,6 +311,55 @@ Optional<Ratio> Parser::parse_ratio(TokenStream<ComponentValue>& tokens)
return Ratio { numerator };
}
// https://drafts.csswg.org/css-fonts-4/#family-name-syntax
RefPtr<CSSStyleValue> Parser::parse_family_name_value(TokenStream<ComponentValue>& tokens)
{
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
// <family-name> = <string> | <custom-ident>+
Vector<String> parts;
while (tokens.has_next_token()) {
auto const& peek = tokens.next_token();
if (peek.is(Token::Type::String)) {
// `font-family: my cool "font";` is invalid.
if (!parts.is_empty())
return nullptr;
tokens.discard_a_token(); // String
tokens.discard_whitespace();
transaction.commit();
return StringStyleValue::create(peek.token().string());
}
if (peek.is(Token::Type::Ident)) {
auto ident = tokens.consume_a_token().token().ident();
// CSS-wide keywords are not allowed
if (is_css_wide_keyword(ident))
return nullptr;
// <generic-family> is a separate type from <family-name>, and so isn't allowed here.
auto maybe_keyword = keyword_from_string(ident);
if (maybe_keyword.has_value() && keyword_to_generic_font_family(maybe_keyword.value()).has_value()) {
return nullptr;
}
parts.append(ident.to_string());
tokens.discard_whitespace();
continue;
}
break;
}
if (parts.is_empty())
return nullptr;
transaction.commit();
return CustomIdentStyleValue::create(MUST(String::join(' ', parts)));
}
// https://www.w3.org/TR/css-syntax-3/#urange-syntax
Optional<Gfx::UnicodeRange> Parser::parse_unicode_range(TokenStream<ComponentValue>& tokens)
{