css_ast/types/
grid_line.rs

1use super::prelude::*;
2use crate::{CustomIdent, PositiveNonZeroInt};
3use css_parse::parse_optionals;
4
5// https://drafts.csswg.org/css-grid-2/#typedef-grid-row-start-grid-line
6// <grid-line> = auto | <custom-ident> | [ [ <integer [-∞,-1]> | <integer [1,∞]> ] && <custom-ident>? ] | [ span && [ <integer [1,∞]> || <custom-ident> ] ]
7#[derive(Peek, ToCursors, ToSpan, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
8#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
9#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit(self))]
10pub enum GridLine {
11	Auto(T![Ident]),
12	Span(T![Ident], Option<PositiveNonZeroInt>, Option<T![Ident]>),
13	Area(CustomIdent),
14	Placement(T![Number], Option<T![Ident]>),
15}
16
17impl<'a> Parse<'a> for GridLine {
18	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
19	where
20		I: Iterator<Item = Cursor> + Clone,
21	{
22		let c = p.peek_n(1);
23		if <T![Ident]>::peek(p, c) {
24			return match p.to_atom::<CssAtomSet>(c) {
25				CssAtomSet::Auto => Ok(GridLine::Auto(p.parse::<T![Ident]>()?)),
26				CssAtomSet::Span => {
27					let keyword = p.parse::<T![Ident]>()?;
28					let (num, ident) = parse_optionals!(p, num: PositiveNonZeroInt, ident: T![Ident]);
29					Ok(Self::Span(keyword, num, ident))
30				}
31				_ => Ok(Self::Area(p.parse::<CustomIdent>()?)),
32			};
33		}
34		let num = p.parse::<T![Number]>()?;
35		{
36			let c: Cursor = num.into();
37			if !num.is_int() {
38				Err(Diagnostic::new(c, Diagnostic::expected_int))?
39			}
40			if num.value() == 0.0 {
41				Err(Diagnostic::new(c, Diagnostic::unexpected_zero))?
42			}
43		}
44
45		Ok(Self::Placement(num, p.parse_if_peek::<T![Ident]>()?))
46	}
47}
48
49#[cfg(test)]
50mod tests {
51	use super::*;
52	use crate::CssAtomSet;
53	use css_parse::{assert_parse, assert_parse_error};
54
55	#[test]
56	fn size_test() {
57		assert_eq!(std::mem::size_of::<GridLine>(), 44);
58	}
59
60	#[test]
61	fn test_writes() {
62		assert_parse!(CssAtomSet::ATOMS, GridLine, "auto", GridLine::Auto(_));
63		assert_parse!(CssAtomSet::ATOMS, GridLine, "span 1 foo", GridLine::Span(_, Some(_), Some(_)));
64		assert_parse!(CssAtomSet::ATOMS, GridLine, "span 1");
65		assert_parse!(CssAtomSet::ATOMS, GridLine, "span foo");
66		assert_parse!(CssAtomSet::ATOMS, GridLine, "span foo 1");
67		assert_parse!(CssAtomSet::ATOMS, GridLine, "baz");
68		assert_parse!(CssAtomSet::ATOMS, GridLine, "1 baz");
69		assert_parse!(CssAtomSet::ATOMS, GridLine, "-1 baz");
70	}
71
72	#[test]
73	fn test_errors() {
74		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span 0 foo");
75		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span 1.2 foo");
76		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span -2 foo");
77		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "0 baz");
78		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span 0");
79		assert_parse_error!(CssAtomSet::ATOMS, GridLine, "span -0 baz");
80	}
81}
css_ast/types/grid_line.rs

css_ast/types/
grid_line.rs
