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feat: implement CSS columns #304
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36c8bbd
feat: support `column-width` and `column-count` properties
yisibl 3fff94c
test: add more case
yisibl 6ba65fd
feat: implement `columns` shorthand
yisibl 80749a2
test: add more shorthand case
yisibl 1503b63
fix: rewrite columns parser
CGQAQ 1a5061d
fix: rewrite columns parser again, all tests passed
CGQAQ a1bbd77
fix: all tests passed include tests other than columns test
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -7,4 +7,5 @@ dist/ | |
| .parcel-cache | ||
| node/*.flow | ||
| artifacts | ||
| npm | ||
| npm | ||
| .idea | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| //! CSS properties related to Multi-column Layout. | ||
| //! https://www.w3.org/TR/css-multicol-1/ | ||
|
|
||
| use super::{Property, PropertyId}; | ||
| use crate::context::PropertyHandlerContext; | ||
| use crate::declaration::{DeclarationBlock, DeclarationList}; | ||
| use crate::error::{ParserError, PrinterError}; | ||
| use crate::macros::{define_shorthand, shorthand_handler}; | ||
| use crate::printer::Printer; | ||
| use crate::targets::Browsers; | ||
| use crate::traits::{Parse, PropertyHandler, Shorthand, ToCss}; | ||
| use crate::values::length::{IntegerOrAuto, Length, LengthOrAuto, LengthValue}; | ||
| use cssparser::*; | ||
| use std::ops::Not; | ||
|
|
||
| define_shorthand! { | ||
| /// A value for the [columns](https://www.w3.org/TR/css-multicol-1/#columns) shorthand property. | ||
| /// columns = <'column-width'> || <'column-count'> | ||
| pub struct Columns { | ||
| /// The column-width property. | ||
| width: ColumnWidth(LengthOrAuto), | ||
| /// The column-count property. | ||
| count: ColumnCount(IntegerOrAuto), | ||
| } | ||
| } | ||
|
|
||
| impl<'i> Parse<'i> for Columns { | ||
| fn parse<'t>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, ParserError<'i>>> { | ||
| let state = input.state(); | ||
| let with_or_count = LengthOrAuto::parse(input)?; | ||
|
|
||
| if let LengthOrAuto::Length(Length::Value(LengthValue::Unitless(..))) = with_or_count { | ||
| // first is unitless, so it must be column-count | ||
| // reparse with column-count | ||
| input.reset(&state); | ||
| let count = IntegerOrAuto::parse(input)?; | ||
| let width = input.try_parse(|input| LengthOrAuto::parse(input)).unwrap_or_default(); | ||
|
|
||
| return Ok(Columns { width, count }); | ||
| } else if matches!(with_or_count, LengthOrAuto::Auto).not() | ||
| && matches!( | ||
| with_or_count, | ||
| LengthOrAuto::Length(Length::Value(LengthValue::Unitless(..))) | ||
| ) | ||
| .not() | ||
| { | ||
| // first is neither unitless nor auto, so it must be column-width | ||
| let count = input.try_parse(|input| IntegerOrAuto::parse(input)).unwrap_or_default(); | ||
|
|
||
| return Ok(Columns { | ||
| width: with_or_count, | ||
| count, | ||
| }); | ||
| } | ||
|
|
||
| // first is auto, check second | ||
| let state = input.state(); | ||
| let count = input.try_parse(|input| LengthOrAuto::parse(input)).unwrap_or_default(); | ||
|
|
||
| if let LengthOrAuto::Auto = count { | ||
| // second is auto, so first must be column-width | ||
| Ok(Columns { | ||
| width: LengthOrAuto::Auto, | ||
| count: IntegerOrAuto::Auto, | ||
| }) | ||
| } else if matches!(count, LengthOrAuto::Length(Length::Value(LengthValue::Unitless(..)))).not() { | ||
| // second is not unitless, so first must be column-count | ||
| // reparse with column-with | ||
| Ok(Columns { | ||
| width: count, | ||
| count: IntegerOrAuto::Auto, | ||
| }) | ||
| } else { | ||
| // second is unitless, so first must be column-width | ||
| input.reset(&state); | ||
| let count = IntegerOrAuto::parse(input)?; | ||
|
|
||
| Ok(Columns { | ||
| width: with_or_count, | ||
| count, | ||
| }) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<'i> ToCss for Columns { | ||
| fn to_css<W>(&self, dest: &mut Printer<W>) -> Result<(), PrinterError> | ||
| where | ||
| W: std::fmt::Write, | ||
| { | ||
| if self.width != LengthOrAuto::default() { | ||
| self.width.to_css(dest)?; | ||
| } | ||
|
|
||
| if self.width != LengthOrAuto::default() && self.count != IntegerOrAuto::default() { | ||
| dest.write_str(" ")?; | ||
| } | ||
|
|
||
| if self.count != IntegerOrAuto::default() { | ||
| self.count.to_css(dest)?; | ||
| } | ||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| shorthand_handler!(ColumnsHandler -> Columns { | ||
| width: ColumnWidth(LengthOrAuto), | ||
| count: ColumnCount(IntegerOrAuto), | ||
| }); | ||
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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.