css_ast/units/
frequency.rs

1use super::prelude::*;
2
3/// <https://drafts.csswg.org/css-values/#frequency>
4///
5/// ```text,ignore
6/// <frequency> = <dimension-token>
7/// ```
8#[node]
9#[derive(
10	Parse, Peek, ToCursors, IntoCursor, ToSpan, SemanticEq, Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash,
11)]
12#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
13#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit(self))]
14#[derive(csskit_derives::NodeWithMetadata)]
15#[metadata(node_kinds = Dimension)]
16pub enum Frequency {
17	#[atom(CssAtomSet::Hz)]
18	Hz(T![Dimension]),
19	#[atom(CssAtomSet::Khz)]
20	Khz(T![Dimension]),
21}
22
23impl Frequency {
24	pub fn as_hertz(&self) -> f32 {
25		match self {
26			Self::Hz(f) => (*f).into(),
27			Self::Khz(f) => Into::<f32>::into(*f) * 1000.0,
28		}
29	}
30}
31
32impl From<Frequency> for f32 {
33	fn from(frequency: Frequency) -> Self {
34		match frequency {
35			Frequency::Hz(f) => f.into(),
36			Frequency::Khz(f) => f.into(),
37		}
38	}
39}
40
41impl ToNumberValue for Frequency {
42	fn to_number_value(&self) -> Option<f32> {
43		Some((*self).into())
44	}
45}
46
47impl ToNormalisedValue for Frequency {
48	fn to_normalised_value(&self) -> Option<f32> {
49		Some(self.as_hertz())
50	}
51}
52
53#[cfg(test)]
54mod tests {
55	use super::*;
56	use crate::CssAtomSet;
57	use css_parse::{assert_parse, assert_peek_false};
58
59	#[test]
60	fn test_writes() {
61		assert_parse!(CssAtomSet::ATOMS, Frequency, "40hz");
62		assert_parse!(CssAtomSet::ATOMS, Frequency, "40khz");
63	}
64
65	#[test]
66	fn test_errors() {
67		assert_peek_false!(CssAtomSet::ATOMS, Frequency, "40w");
68		assert_peek_false!(CssAtomSet::ATOMS, Frequency, "40kw");
69	}
70}
css_ast/units/frequency.rs

css_ast/units/
frequency.rs
