css_ast/types/
shadow.rs

1use super::prelude::*;
2use crate::{Color, Length, NonNegative};
3
4/// <https://drafts.csswg.org/css-backgrounds-3/#typedef-shadow>
5///
6/// ```text,ignore
7/// <shadow> = <color>? && [<length>{2} <length [0,∞]>? <length>?] && inset?
8/// ```
9#[derive(ToCursors, ToSpan, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
10#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
11#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit)]
12#[derive(csskit_derives::NodeWithMetadata)]
13pub struct Shadow<'a> {
14	pub color: Option<Color<'a>>,
15	pub offset: (Length, Length),
16	pub blur_radius: Option<NonNegative<Length>>,
17	pub spread_radius: Option<Length>,
18	#[cfg_attr(feature = "visitable", visit(skip))]
19	pub inset: Option<T![Ident]>,
20}
21
22impl<'a> Peek<'a> for Shadow<'a> {
23	fn peek<I>(p: &Parser<'a, I>, c: Cursor) -> bool
24	where
25		I: Iterator<Item = Cursor> + Clone,
26	{
27		Color::peek(p, c) || Length::peek(p, c)
28	}
29}
30
31impl<'a> Parse<'a> for Shadow<'a> {
32	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
33	where
34		I: Iterator<Item = Cursor> + Clone,
35	{
36		let color = p.parse_if_peek::<Color>()?;
37
38		let x = p.parse::<Length>()?;
39		let y = p.parse::<Length>()?;
40
41		let blur_radius = p.parse_if_peek::<NonNegative<Length>>()?;
42
43		let spread_radius = p.parse_if_peek::<Length>()?;
44
45		let inset = p.parse_if_peek::<T![Ident]>()?;
46		if let Some(ident) = inset
47			&& !p.equals_atom(ident.into(), &CssAtomSet::Inset)
48		{
49			let c: Cursor = x.into();
50			Err(Diagnostic::new(c, Diagnostic::unexpected_ident))?
51		}
52
53		Ok(Self { color, offset: (x, y), blur_radius, spread_radius, inset })
54	}
55}
56
57#[cfg(test)]
58mod tests {
59	use super::*;
60	use crate::CssAtomSet;
61	use css_parse::{assert_parse, assert_parse_error};
62
63	#[test]
64	fn size_test() {
65		assert_eq!(std::mem::size_of::<Shadow<'_>>(), 104);
66	}
67
68	#[test]
69	fn test_writes() {
70		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px");
71		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px");
72		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px");
73		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px");
74		assert_parse!(CssAtomSet::ATOMS, Shadow, "#ff0000 10px 20px 5px");
75		assert_parse!(CssAtomSet::ATOMS, Shadow, "rgba(255,0,0,0.5)10px 20px 5px 3px");
76		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px inset");
77		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset");
78		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset");
79		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px inset");
80		assert_parse!(CssAtomSet::ATOMS, Shadow, "blue 10px 20px 5px 3px inset");
81		assert_parse!(CssAtomSet::ATOMS, Shadow, "-10px -20px");
82		assert_parse!(CssAtomSet::ATOMS, Shadow, "red -10px -20px 5px");
83		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0");
84		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0");
85		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0 0");
86		assert_parse!(CssAtomSet::ATOMS, Shadow, "1em 2em");
87		assert_parse!(CssAtomSet::ATOMS, Shadow, "1rem 2rem 0.5rem");
88	}
89
90	#[test]
91	fn test_errors() {
92		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "");
93		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10% 20%");
94		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px");
95		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "red");
96		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "inset");
97		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px -5px");
98		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px 7px");
99		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px notinset");
100		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset 3px");
101		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset extra");
102	}
103
104	#[test]
105	#[cfg(feature = "visitable")]
106	fn test_visits() {
107		use crate::assert_visits;
108		assert_visits!("10px 20px", Shadow, Length, Length);
109		assert_visits!("red 10px 20px", Shadow, Color, Length, Length);
110		assert_visits!("10px 20px 5px", Shadow, Length, Length, Length);
111		assert_visits!("blue 10px 20px 5px 3px", Shadow, Color, Length, Length, Length, Length);
112	}
113}
css_ast/types/shadow.rs

css_ast/types/
shadow.rs
