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LibWeb: Introduce and parse CSS Ratio type

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This is only used by media-queries, so for now we can skip
adding/parsing a StyleValue for these.
This commit is contained in:
Sam Atkins 2022-03-06 13:48:32 +00:00 • committed by Andreas Kling
parent e30bfabbca
commit 5f93f1c161
5 changed files with 99 additions and 0 deletions
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33
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -2231,6 +2231,39 @@ Optional<Length> Parser::parse_length(StyleComponentValueRule const& component_v
return {};
}
Optional<Ratio> Parser::parse_ratio(TokenStream<StyleComponentValueRule>& tokens)
{
auto position = tokens.position();
tokens.skip_whitespace();
auto error = [&]() -> Optional<Ratio> {
tokens.rewind_to_position(position);
return {};
};
// `<ratio> = <number [0,∞]> [ / <number [0,∞]> ]?`
// FIXME: I think either part is allowed to be calc(), which makes everything complicated.
auto first_number = tokens.next_token();
if (!first_number.is(Token::Type::Number) || first_number.token().number_value() < 0)
return error();
auto position_after_first_number = tokens.position();
tokens.skip_whitespace();
auto solidus = tokens.next_token();
tokens.skip_whitespace();
auto second_number = tokens.next_token();
if (solidus.is(Token::Type::Delim) && solidus.token().delim() == "/"
&& second_number.is(Token::Type::Number) && second_number.token().number_value() > 0) {
// Two-value ratio
return Ratio { static_cast<float>(first_number.token().number_value()), static_cast<float>(second_number.token().number_value()) };
}
// Single-value ratio
tokens.rewind_to_position(position_after_first_number);
return Ratio { static_cast<float>(first_number.token().number_value()) };
}
RefPtr<StyleValue> Parser::parse_dimension_value(StyleComponentValueRule const& component_value)
{
// Numbers with no units can be lengths, in two situations: