css_ast/types/
grid_line.rs

1use super::prelude::*;
2use crate::{CSSInt, CustomIdent, NonZero, NumericValue, PositiveNonZeroInt};
3use css_parse::parse_optionals;
4
5/// <https://drafts.csswg.org/css-grid-2/#typedef-grid-row-start-grid-line>
6///
7/// ```text,ignore
8/// <grid-line> = auto | <custom-ident> | [ [ <integer [-∞,-1]> | <integer [1,∞]> ] && <custom-ident>? ] | [ span && [ <integer [1,∞]> || <custom-ident> ] ]
9/// ```
10#[node]
11#[derive(Peek, ToCursors, ToSpan, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
12#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
13#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit(self))]
14#[derive(csskit_derives::NodeWithMetadata)]
15pub enum GridLine<'a> {
16	Auto(T![Ident]),
17	Span(T![Ident], Option<NumericValue<'a, PositiveNonZeroInt>>, Option<T![Ident]>),
18	Area(CustomIdent),
19	Placement(NumericValue<'a, NonZero<CSSInt>>, Option<T![Ident]>),
20}
21
22impl<'a> Parse<'a> for GridLine<'a> {
23	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
24	where
25		I: Iterator<Item = Cursor> + Clone,
26	{
27		let c = p.peek_n(1);
28		if <T![Ident]>::peek(p, c) {
29			return match p.to_atom::<CssAtomSet>(c) {
30				CssAtomSet::Auto => Ok(GridLine::Auto(p.parse::<T![Ident]>()?)),
31				CssAtomSet::Span => {
32					let keyword = p.parse::<T![Ident]>()?;
33					let (num, ident) = parse_optionals!(p, num: NumericValue<PositiveNonZeroInt>, ident: T![Ident]);
34					Ok(Self::Span(keyword, num, ident))
35				}
36				_ => Ok(Self::Area(p.parse::<CustomIdent>()?)),
37			};
38		}
39		let num = p.parse::<NumericValue<NonZero<CSSInt>>>()?;
40		Ok(Self::Placement(num, p.parse_if_peek::<T![Ident]>()?))
41	}
42}
43
44#[cfg(test)]
45mod tests {
46	use super::*;
47	use crate::CssAtomSet;
48	use css_parse::{assert_parse, assert_parse_error};
49
50	#[test]
51	fn test_writes() {
52		assert_parse!(CssAtomSet::ATOMS, GridLine, "auto", GridLine::Auto(_));
53		assert_parse!(CssAtomSet::ATOMS, GridLine, "span 1 foo", GridLine::Span(_, Some(_), Some(_)));
54		assert_parse!(CssAtomSet::ATOMS, GridLine, "span 1");
55		assert_parse!(CssAtomSet::ATOMS, GridLine, "span foo");
56		assert_parse!(CssAtomSet::ATOMS, GridLine, "span foo 1");
57		assert_parse!(CssAtomSet::ATOMS, GridLine, "baz");
58		assert_parse!(CssAtomSet::ATOMS, GridLine, "1 baz");
59		assert_parse!(CssAtomSet::ATOMS, GridLine, "-1 baz");
60	}
61
62	#[test]
63	fn test_substitution() {
64		assert_parse!(CssAtomSet::ATOMS, GridLine, "var(--n)");
65		assert_parse!(CssAtomSet::ATOMS, GridLine, "calc(1 + 1) baz");
66		assert_parse!(CssAtomSet::ATOMS, GridLine, "span var(--n)");
67		assert_parse!(CssAtomSet::ATOMS, GridLine, "span calc(1 + 1) foo");
68	}
69
70	#[test]
71	fn test_errors() {
72		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span 0 foo");
73		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span 1.2 foo");
74		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span -2 foo");
75		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "0 baz");
76		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span 0");
77		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span -0 baz");
78	}
79}
css_ast/types/grid_line.rs

css_ast/types/
grid_line.rs
