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// <shadow> = <color>? && [<length>{2} <length [0,∞]>? <length>?] && inset?
6#[derive(ToCursors, ToSpan, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
7#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
8#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit)]
9#[derive(csskit_derives::NodeWithMetadata)]
10pub struct Shadow {
11	pub color: Option<Color>,
12	pub offset: (Length, Length),
13	pub blur_radius: Option<NonNegative<Length>>,
14	pub spread_radius: Option<Length>,
15	#[cfg_attr(feature = "visitable", visit(skip))]
16	pub inset: Option<T![Ident]>,
17}
18
19impl<'a> Peek<'a> for Shadow {
20	fn peek<I>(p: &Parser<'a, I>, c: Cursor) -> bool
21	where
22		I: Iterator<Item = Cursor> + Clone,
23	{
24		Color::peek(p, c) || Length::peek(p, c)
25	}
26}
27
28impl<'a> Parse<'a> for Shadow {
29	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
30	where
31		I: Iterator<Item = Cursor> + Clone,
32	{
33		let color = p.parse_if_peek::<Color>()?;
34
35		let x = p.parse::<Length>()?;
36		let y = p.parse::<Length>()?;
37
38		let blur_radius = p.parse_if_peek::<NonNegative<Length>>()?;
39
40		let spread_radius = p.parse_if_peek::<Length>()?;
41
42		let inset = p.parse_if_peek::<T![Ident]>()?;
43		if let Some(ident) = inset
44			&& !p.equals_atom(ident.into(), &CssAtomSet::Inset)
45		{
46			let c: Cursor = x.into();
47			Err(Diagnostic::new(c, Diagnostic::unexpected_ident))?
48		}
49
50		Ok(Self { color, offset: (x, y), blur_radius, spread_radius, inset })
51	}
52}
53
54#[cfg(test)]
55mod tests {
56	use super::*;
57	use crate::CssAtomSet;
58	use css_parse::{assert_parse, assert_parse_error};
59
60	#[test]
61	fn size_test() {
62		assert_eq!(std::mem::size_of::<Shadow>(), 220);
63	}
64
65	#[test]
66	fn test_writes() {
67		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px");
68		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px");
69		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px");
70		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px");
71		assert_parse!(CssAtomSet::ATOMS, Shadow, "#ff0000 10px 20px 5px");
72		assert_parse!(CssAtomSet::ATOMS, Shadow, "rgba(255,0,0,0.5)10px 20px 5px 3px");
73		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px inset");
74		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset");
75		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset");
76		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px inset");
77		assert_parse!(CssAtomSet::ATOMS, Shadow, "blue 10px 20px 5px 3px inset");
78		assert_parse!(CssAtomSet::ATOMS, Shadow, "-10px -20px");
79		assert_parse!(CssAtomSet::ATOMS, Shadow, "red -10px -20px 5px");
80		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0");
81		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0");
82		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0 0");
83		assert_parse!(CssAtomSet::ATOMS, Shadow, "1em 2em");
84		assert_parse!(CssAtomSet::ATOMS, Shadow, "1rem 2rem 0.5rem");
85	}
86
87	#[test]
88	fn test_errors() {
89		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "");
90		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10% 20%");
91		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px");
92		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "red");
93		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "inset");
94		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px -5px");
95		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px 7px");
96		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px notinset");
97		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset 3px");
98		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset extra");
99	}
100
101	#[test]
102	#[cfg(feature = "visitable")]
103	fn test_visits() {
104		use crate::assert_visits;
105		assert_visits!("10px 20px", Shadow, Length, Length);
106		assert_visits!("red 10px 20px", Shadow, Color, Length, Length);
107		assert_visits!("10px 20px 5px", Shadow, Length, Length, Length);
108		assert_visits!("blue 10px 20px 5px 3px", Shadow, Color, Length, Length, Length, Length);
109	}
110}
css_ast/types/shadow.rs

css_ast/types/
shadow.rs
