css_ast/types/
shadow.rs

1use super::prelude::*;
2use crate::{CalcableValue, Color, Length, NonNegative};
3
4/// `<length>{2} <length [0,∞]>? <length>?`: the x/y offsets, optional blur radius, optional
5/// spread. Each `<length>` slot is a [`CalcableValue`] so `calc()`/`var()`/etc. are permitted.
6type ShadowOffset<'a> = (
7	CalcableValue<'a, Length>,
8	CalcableValue<'a, Length>,
9	Option<CalcableValue<'a, NonNegative<Length>>>,
10	Option<CalcableValue<'a, Length>>,
11);
12/// <https://drafts.csswg.org/css-backgrounds-3/#typedef-shadow>
13///
14/// ```text,ignore
15/// <shadow> = <color>? && [<length>{2} <length [0,∞]>? <length>?] && inset?
16/// ```
17#[node]
18#[derive(Parse, Peek, ToCursors, ToSpan, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
19#[parse(all_must_occur)]
20#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
21#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit)]
22#[derive(csskit_derives::NodeWithMetadata)]
23pub struct Shadow<'a> {
24	pub color: Option<Color<'a>>,
25	pub offset: ShadowOffset<'a>,
26	#[atom(CssAtomSet::Inset)]
27	pub inset: Option<T![Ident]>,
28}
29
30#[cfg(test)]
31mod tests {
32	use super::*;
33	use crate::CssAtomSet;
34	use css_parse::{assert_parse, assert_parse_error, assert_peek_false};
35
36	#[test]
37	fn test_writes() {
38		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px");
39		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px");
40		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px");
41		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px");
42		assert_parse!(CssAtomSet::ATOMS, Shadow, "#ff0000 10px 20px 5px");
43		assert_parse!(CssAtomSet::ATOMS, Shadow, "rgba(255,0,0,0.5)10px 20px 5px 3px");
44		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px inset");
45		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset");
46		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset");
47		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px inset");
48		assert_parse!(CssAtomSet::ATOMS, Shadow, "blue 10px 20px 5px 3px inset");
49		assert_parse!(CssAtomSet::ATOMS, Shadow, "-10px -20px");
50		assert_parse!(CssAtomSet::ATOMS, Shadow, "red -10px -20px 5px");
51		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0");
52		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0");
53		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0 0");
54		assert_parse!(CssAtomSet::ATOMS, Shadow, "1em 2em");
55		assert_parse!(CssAtomSet::ATOMS, Shadow, "1rem 2rem 0.5rem");
56	}
57
58	#[test]
59	fn test_substitution_offsets() {
60		assert_parse!(CssAtomSet::ATOMS, Shadow, "calc(1px + 2px) 20px");
61		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px calc(2px * 3)");
62		assert_parse!(CssAtomSet::ATOMS, Shadow, "var(--x) var(--y)");
63		assert_parse!(CssAtomSet::ATOMS, Shadow, "red var(--x) 20px calc(5px) 3px");
64		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px max(1px, 2px) inset");
65	}
66
67	#[test]
68	fn test_inset_leading() {
69		assert_parse!(CssAtomSet::ATOMS, Shadow, "inset 10px 20px");
70		assert_parse!(CssAtomSet::ATOMS, Shadow, "inset 0 1px 1px");
71		assert_parse!(CssAtomSet::ATOMS, Shadow, "inset 0 1px 1px rgba(0,0,0,.075)");
72		assert_parse!(CssAtomSet::ATOMS, Shadow, "inset red 10px 20px");
73		assert_parse!(CssAtomSet::ATOMS, Shadow, "red inset 10px 20px");
74	}
75
76	#[test]
77	fn test_errors() {
78		assert_peek_false!(CssAtomSet::ATOMS, Shadow, "");
79		assert_peek_false!(CssAtomSet::ATOMS, Shadow, "10% 20%");
80		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px");
81		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "red");
82		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "inset");
83		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px -5px");
84		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px 7px");
85		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset 3px");
86		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset extra");
87	}
88
89	#[test]
90	#[cfg(feature = "visitable")]
91	fn test_visits() {
92		use crate::assert_visits;
93		assert_visits!("10px 20px", Shadow, Length, Length);
94		assert_visits!("red 10px 20px", Shadow, Color, Length, Length);
95		assert_visits!("10px 20px 5px", Shadow, Length, Length, Length);
96		assert_visits!("blue 10px 20px 5px 3px", Shadow, Color, Length, Length, Length, Length);
97	}
98}
css_ast/types/shadow.rs

css_ast/types/
shadow.rs
