css_ast/types/
grid_line.rs

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

css_ast/types/
grid_line.rs
