feat: implement CSS columns #304
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yisibl
commented
Sep 23, 2022
yisibl
commented
- Spec: https://www.w3.org/TR/css-multicol-1/#columns
Co-authored-by: Jason <m.jason.liu@outlook.com>
Co-authored-by: Jason <m.jason.liu@outlook.com>
Co-authored-by: Jason <m.jason.liu@outlook.com>
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@devongovett PTAL |
devongovett
reviewed
Oct 24, 2022
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| /// A [`<length>`](https://www.w3.org/TR/css-values-4/#lengths) value | ||
| /// without a unit specified. | ||
| Unitless(CSSNumber), |
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What is this needed for? Aren't unitless lengths only allowed for zero, and compute to pixels? So why not just store as pixels?
| derive(serde::Serialize, serde::Deserialize), | ||
| serde(tag = "type", content = "value", rename_all = "kebab-case") | ||
| )] | ||
| pub enum LengthOrAuto { |
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We could probably make a generic type that allows "auto" or a type parameter. Happy to implement that separately.
| let state = input.state(); | ||
| let with_or_count = LengthOrAuto::parse(input)?; | ||
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| if let LengthOrAuto::Length(Length::Value(LengthValue::Unitless(..))) = with_or_count { |
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Rather than parsing as a unitless length, you could instead first try parsing the column count, and if that fails, try parsing the length. When parsing shorthands where order doesn't matter, it can be useful to structure the code using a loop, trying to parse each property until values are found. There are many examples, here's one.
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