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LibWeb: Implement helpers for parsing CSS numeric types

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Frequently we want to parse "anything that's a `<length-percentage>`" or
similar, which could be a constant value or a calculation, but didn't
have a nice way of doing so. That meant repeating the same "try and
parse a dimension, see if it's the right type, then maybe try and parse
a calculation and see if that's the right type" boilerplate code. Or
more often, forgetting about calculations entirely.

These helpers should make that a lot more convenient to do. And they
also use TokenStream, so we can eventually drop the old `parse_length()`
method.
This commit is contained in:
Sam Atkins 2023-12-28 12:43:38 +00:00 • committed by Andreas Kling
parent 30dcbc306c
commit e62d692205
2 changed files with 259 additions and 0 deletions
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13
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -171,6 +171,19 @@ private:
Optional<StyleProperty> convert_to_style_property(Declaration const&);
Optional<Dimension> parse_dimension(ComponentValue const&);
Optional<AngleOrCalculated> parse_angle(TokenStream<ComponentValue>&);
Optional<AnglePercentage> parse_angle_percentage(TokenStream<ComponentValue>&);
Optional<FlexOrCalculated> parse_flex(TokenStream<ComponentValue>&);
Optional<FrequencyOrCalculated> parse_frequency(TokenStream<ComponentValue>&);
Optional<FrequencyPercentage> parse_frequency_percentage(TokenStream<ComponentValue>&);
Optional<IntegerOrCalculated> parse_integer(TokenStream<ComponentValue>&);
Optional<LengthOrCalculated> parse_length(TokenStream<ComponentValue>&);
Optional<LengthPercentage> parse_length_percentage(TokenStream<ComponentValue>&);
Optional<NumberOrCalculated> parse_number(TokenStream<ComponentValue>&);
Optional<ResolutionOrCalculated> parse_resolution(TokenStream<ComponentValue>&);
Optional<TimeOrCalculated> parse_time(TokenStream<ComponentValue>&);
Optional<TimePercentage> parse_time_percentage(TokenStream<ComponentValue>&);
Optional<Color> parse_rgb_or_hsl_color(StringView function_name, Vector<ComponentValue> const&);
Optional<Color> parse_color(ComponentValue const&);
Optional<Length> parse_length(ComponentValue const&);