css_ast/types/
shadow.rs

1use super::prelude::*;
2use crate::{Color, Length};
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)]
9pub struct Shadow {
10	pub color: Option<Color>,
11	pub offset: (Length, Length),
12	pub blur_radius: Option<Length>,
13	pub spread_radius: Option<Length>,
14	#[cfg_attr(feature = "visitable", visit(skip))]
15	pub inset: Option<T![Ident]>,
16}
17
18impl<'a> Peek<'a> for Shadow {
19	fn peek<I>(p: &Parser<'a, I>, c: Cursor) -> bool
20	where
21		I: Iterator<Item = Cursor> + Clone,
22	{
23		Color::peek(p, c) || Length::peek(p, c)
24	}
25}
26
27impl<'a> Parse<'a> for Shadow {
28	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
29	where
30		I: Iterator<Item = Cursor> + Clone,
31	{
32		let color = p.parse_if_peek::<Color>()?;
33
34		let x = p.parse::<Length>()?;
35		let y = p.parse::<Length>()?;
36
37		let blur_radius = p.parse_if_peek::<Length>()?;
38		if let Some(blur) = blur_radius
39			&& 0.0f32 > blur.into()
40		{
41			Err(Diagnostic::new(blur.into(), Diagnostic::number_too_small))?
42		}
43
44		let spread_radius = p.parse_if_peek::<Length>()?;
45
46		let inset = p.parse_if_peek::<T![Ident]>()?;
47		if let Some(ident) = inset
48			&& !p.equals_atom(ident.into(), &CssAtomSet::Inset)
49		{
50			let c: Cursor = x.into();
51			Err(Diagnostic::new(c, Diagnostic::unexpected_ident))?
52		}
53
54		Ok(Self { color, offset: (x, y), blur_radius, spread_radius, inset })
55	}
56}
57
58#[cfg(test)]
59mod tests {
60	use super::*;
61	use crate::CssAtomSet;
62	use css_parse::{assert_parse, assert_parse_error};
63
64	#[test]
65	fn size_test() {
66		assert_eq!(std::mem::size_of::<Shadow>(), 220);
67	}
68
69	#[test]
70	fn test_writes() {
71		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px");
72		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px");
73		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px");
74		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px");
75		assert_parse!(CssAtomSet::ATOMS, Shadow, "#ff0000 10px 20px 5px");
76		assert_parse!(CssAtomSet::ATOMS, Shadow, "rgba(255,0,0,0.5)10px 20px 5px 3px");
77		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px inset");
78		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset");
79		assert_parse!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset");
80		assert_parse!(CssAtomSet::ATOMS, Shadow, "red 10px 20px inset");
81		assert_parse!(CssAtomSet::ATOMS, Shadow, "blue 10px 20px 5px 3px inset");
82		assert_parse!(CssAtomSet::ATOMS, Shadow, "-10px -20px");
83		assert_parse!(CssAtomSet::ATOMS, Shadow, "red -10px -20px 5px");
84		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0");
85		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0");
86		assert_parse!(CssAtomSet::ATOMS, Shadow, "0 0 0 0");
87		assert_parse!(CssAtomSet::ATOMS, Shadow, "1em 2em");
88		assert_parse!(CssAtomSet::ATOMS, Shadow, "1rem 2rem 0.5rem");
89	}
90
91	#[test]
92	fn test_errors() {
93		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "");
94		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10% 20%");
95		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px");
96		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "red");
97		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "inset");
98		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px -5px");
99		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px 7px");
100		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px notinset");
101		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px inset 3px");
102		assert_parse_error!(CssAtomSet::ATOMS, Shadow, "10px 20px 5px 3px inset extra");
103	}
104
105	#[test]
106	#[cfg(feature = "visitable")]
107	fn test_visits() {
108		use crate::assert_visits;
109		assert_visits!("10px 20px", Shadow, Length, Length);
110		assert_visits!("red 10px 20px", Shadow, Color, Length, Length);
111		assert_visits!("10px 20px 5px", Shadow, Length, Length, Length);
112		assert_visits!("blue 10px 20px 5px 3px", Shadow, Color, Length, Length, Length, Length);
113	}
114}
css_ast/types/shadow.rs

css_ast/types/
shadow.rs
