css_ast/types/
opacity_value.rs

1use css_parse::{Build, Cursor, Parser, Peek, T};
2use csskit_derives::{IntoCursor, ToCursors, Visitable};
3
4#[derive(IntoCursor, ToCursors, Visitable, Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
5#[cfg_attr(feature = "serde", derive(serde::Serialize))]
6#[visit(self)]
7pub enum OpacityValue {
8	Number(T![Number]),
9	Percent(T![Dimension::%]),
10}
11
12impl OpacityValue {
13	#[allow(non_upper_case_globals)]
14	pub const Zero: OpacityValue = OpacityValue::Number(<T![Number]>::NUMBER_ZERO);
15}
16
17impl From<OpacityValue> for i32 {
18	fn from(value: OpacityValue) -> Self {
19		match value {
20			OpacityValue::Number(t) => t.into(),
21			OpacityValue::Percent(t) => t.into(),
22		}
23	}
24}
25
26impl From<OpacityValue> for f32 {
27	fn from(value: OpacityValue) -> Self {
28		match value {
29			OpacityValue::Number(t) => t.into(),
30			OpacityValue::Percent(t) => t.into(),
31		}
32	}
33}
34
35impl<'a> Peek<'a> for OpacityValue {
36	fn peek(p: &Parser<'a>, c: Cursor) -> bool {
37		(<T![Number]>::peek(p, c) && (0.0..=1.0).contains(&c.token().value()))
38			|| (<T![Dimension::%]>::peek(p, c) && (0.0..=100.0).contains(&c.token().value()))
39	}
40}
41
42impl<'a> Build<'a> for OpacityValue {
43	fn build(p: &Parser<'a>, c: Cursor) -> Self {
44		if <T![Number]>::peek(p, c) {
45			Self::Number(<T![Number]>::build(p, c))
46		} else {
47			Self::Percent(<T![Dimension::%]>::build(p, c))
48		}
49	}
50}
51
52#[cfg(test)]
53mod tests {
54	use super::*;
55	use css_parse::{assert_parse, assert_parse_error};
56
57	#[test]
58	fn size_test() {
59		assert_eq!(std::mem::size_of::<OpacityValue>(), 16);
60	}
61
62	#[test]
63	fn test_writes() {
64		assert_parse!(OpacityValue, "0.1");
65		assert_parse!(OpacityValue, "1");
66		assert_parse!(OpacityValue, "50%");
67	}
68
69	#[test]
70	fn test_errors() {
71		assert_parse_error!(OpacityValue, "20");
72		assert_parse_error!(OpacityValue, "1000%");
73	}
74
75	// #[cfg(feature = "serde")]
76	// #[test]
77	// fn test_serializes() {
78	// 	assert_json!(OpacityValue, "0.1", {
79	// 		"node": [0, 3],
80	// 		"start": 0,
81	// 		"end": 5
82	// 	});
83	// }
84}
css_ast/types/opacity_value.rs

css_ast/types/
opacity_value.rs
