css_ast/rules/
supports.rs

1use super::prelude::*;
2use crate::selector::ComplexSelector;
3
4///
5/// ```md
6/// <general-enclosed>
7///  │├─╮─ <function-token> ─╭─╮─ <any-value> ─╭─ ")" ─┤│
8///     ╰─ "(" ──────────────╯ ╰───────────────╯
9///
10///
11/// <supports-in-parens>
12///  │├─╮─ "(" ─ <supports-condition> ─ ")" ─╭──┤│
13///     ├─────── <supports-feature> ─────────┤
14///     ╰─────── <general-enclosed> ─────────╯
15///
16/// <supports-feature>
17///  │├─ <supports-decl> ──┤│
18///
19/// <supports-feature>
20///  │├─ "(" ─ <declaration> ─ ")" ─┤│
21///
22///
23/// <container-condition> = [ <container-name>? <container-query>? ]!
24/// <container-name> = <custom-ident>
25/// <container-query> = not <query-in-parens>
26///                   | <query-in-parens> [ [ and <query-in-parens> ]* | [ or <query-in-parens> ]* ]
27/// <query-in-parens> = ( <container-query> )
28///                   | ( <size-feature> )
29///                   | style( <style-query> )
30///                   | scroll-state( <scroll-state-query> )
31///                   | <general-enclosed>
32///
33/// <https://drafts.csswg.org/css-conditional-3/#at-supports>
34/// <https://drafts.csswg.org/css-conditional-3/#at-ruledef-supports>
35#[derive(Parse, Peek, ToSpan, ToCursors, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
36#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
37#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit)]
38#[cfg_attr(feature = "css_feature_data", derive(::csskit_derives::ToCSSFeature), css_feature("css.at-rules.property"))]
39pub struct SupportsRule<'a> {
40	#[cfg_attr(feature = "visitable", visit(skip))]
41	#[atom(CssAtomSet::Supports)]
42	pub name: T![AtKeyword],
43	pub prelude: SupportsCondition<'a>,
44	pub block: SupportsRuleBlock<'a>,
45}
46
47#[derive(Parse, Peek, ToSpan, ToCursors, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
48#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable))]
49#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
50pub struct SupportsRuleBlock<'a>(RuleList<'a, Rule<'a>>);
51
52#[derive(ToSpan, ToCursors, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
53#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
54pub enum SupportsCondition<'a> {
55	Is(SupportsFeature<'a>),
56	Not(T![Ident], SupportsFeature<'a>),
57	And(Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>),
58	Or(Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>),
59}
60
61impl<'a> FeatureConditionList<'a> for SupportsCondition<'a> {
62	type FeatureCondition = SupportsFeature<'a>;
63	fn keyword_is_not<I>(p: &Parser<'a, I>, c: Cursor) -> bool
64	where
65		I: Iterator<Item = Cursor> + Clone,
66	{
67		p.equals_atom(c, &CssAtomSet::Not)
68	}
69	fn keyword_is_and<I>(p: &Parser<'a, I>, c: Cursor) -> bool
70	where
71		I: Iterator<Item = Cursor> + Clone,
72	{
73		p.equals_atom(c, &CssAtomSet::And)
74	}
75	fn keyword_is_or<I>(p: &Parser<'a, I>, c: Cursor) -> bool
76	where
77		I: Iterator<Item = Cursor> + Clone,
78	{
79		p.equals_atom(c, &CssAtomSet::Or)
80	}
81	fn build_is(feature: SupportsFeature<'a>) -> Self {
82		Self::Is(feature)
83	}
84	fn build_not(keyword: T![Ident], feature: SupportsFeature<'a>) -> Self {
85		Self::Not(keyword, feature)
86	}
87	fn build_and(feature: Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>) -> Self {
88		Self::And(feature)
89	}
90	fn build_or(feature: Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>) -> Self {
91		Self::Or(feature)
92	}
93}
94
95impl<'a> Parse<'a> for SupportsCondition<'a> {
96	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
97	where
98		I: Iterator<Item = Cursor> + Clone,
99	{
100		if p.peek::<T![Function]>() || p.peek::<T!['(']>() {
101			return Ok(Self::Is(p.parse::<SupportsFeature>()?));
102		}
103		Self::parse_condition(p)
104	}
105}
106
107#[cfg(feature = "visitable")]
108impl<'a> VisitableTrait for SupportsCondition<'a> {
109	fn accept<V: Visit>(&self, v: &mut V) {
110		match self {
111			Self::Is(feature) => feature.accept(v),
112			Self::Not(_, feature) => feature.accept(v),
113			Self::And(features) => {
114				for (feature, _) in features {
115					feature.accept(v);
116				}
117			}
118			Self::Or(features) => {
119				for (feature, _) in features {
120					feature.accept(v);
121				}
122			}
123		}
124	}
125}
126
127#[cfg(feature = "visitable")]
128impl<'a> VisitableMut for SupportsCondition<'a> {
129	fn accept_mut<V: VisitMut>(&mut self, v: &mut V) {
130		match self {
131			Self::Is(feature) => feature.accept_mut(v),
132			Self::Not(_, feature) => feature.accept_mut(v),
133			Self::And(features) => {
134				for (feature, _) in features {
135					feature.accept_mut(v);
136				}
137			}
138			Self::Or(features) => {
139				for (feature, _) in features {
140					feature.accept_mut(v);
141				}
142			}
143		}
144	}
145}
146
147#[allow(clippy::large_enum_variant)] // TODO: Box?
148#[derive(ToCursors, ToSpan, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
149#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
150pub enum SupportsFeature<'a> {
151	FontTech(Option<T!['(']>, T![Function], ComponentValues<'a>, T![')'], Option<T![')']>),
152	FontFormat(Option<T!['(']>, T![Function], ComponentValues<'a>, T![')'], Option<T![')']>),
153	Selector(Option<T!['(']>, T![Function], ComplexSelector<'a>, T![')'], Option<T![')']>),
154	Property(T!['('], Declaration<'a, StyleValue<'a>>, Option<T![')']>),
155}
156
157impl<'a> Parse<'a> for SupportsFeature<'a> {
158	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
159	where
160		I: Iterator<Item = Cursor> + Clone,
161	{
162		let open = p.parse_if_peek::<T!['(']>()?;
163		if p.peek::<T![Function]>() {
164			let function = p.parse::<T![Function]>()?;
165			match p.to_atom::<CssAtomSet>(function.into()) {
166				CssAtomSet::Selector => {
167					let selector = p.parse::<ComplexSelector>()?;
168					// End function
169					let close = p.parse::<T![')']>()?;
170					let open_close = if open.is_some() { Some(p.parse::<T![')']>()?) } else { None };
171					Ok(Self::Selector(open, function, selector, close, open_close))
172				}
173				CssAtomSet::FontTech => {
174					todo!();
175				}
176				CssAtomSet::FontFormat => {
177					todo!();
178				}
179				_ => Err(Diagnostic::new(p.next(), Diagnostic::unexpected_function))?,
180			}
181		} else if let Some(open) = open {
182			let property = p.parse::<Declaration<'a, StyleValue<'a>>>()?;
183			let close = p.parse_if_peek::<T![')']>()?;
184			Ok(Self::Property(open, property, close))
185		} else {
186			Err(Diagnostic::new(p.next(), Diagnostic::unexpected))?
187		}
188	}
189}
190
191#[cfg(feature = "visitable")]
192impl<'a> VisitableTrait for SupportsFeature<'a> {
193	fn accept<V: Visit>(&self, v: &mut V) {
194		match self {
195			Self::FontTech(_, _, _, _, _) => todo!(),
196			Self::FontFormat(_, _, _, _, _) => todo!(),
197			Self::Selector(_, _, selector, _, _) => selector.accept(v),
198			Self::Property(_, property, _) => property.accept(v),
199		}
200	}
201}
202
203#[cfg(feature = "visitable")]
204impl<'a> VisitableMut for SupportsFeature<'a> {
205	fn accept_mut<V: VisitMut>(&mut self, v: &mut V) {
206		match self {
207			Self::FontTech(_, _, _, _, _) => todo!(),
208			Self::FontFormat(_, _, _, _, _) => todo!(),
209			Self::Selector(_, _, selector, _, _) => selector.accept_mut(v),
210			Self::Property(_, property, _) => property.accept_mut(v),
211		}
212	}
213}
214
215#[cfg(test)]
216mod tests {
217	use super::*;
218	use crate::CssAtomSet;
219	use css_parse::assert_parse;
220
221	#[test]
222	fn size_test() {
223		assert_eq!(std::mem::size_of::<SupportsRule>(), 496);
224		assert_eq!(std::mem::size_of::<SupportsCondition>(), 416);
225		assert_eq!(std::mem::size_of::<SupportsRuleBlock>(), 64);
226	}
227
228	#[test]
229	fn test_writes() {
230		assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(color:black){}");
231		assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width:1px){body{width:1px}}");
232		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not (width:1--foo){}");
233		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width: 1--foo) or (width: 1foo) {\n\n}");
234		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width: 1--foo) and (width: 1foo) {\n\n}");
235		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width: 100vw) {\n\tbody {\n\t\twidth: 100vw;\n\t}\n}");
236		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not ((text-align-last: justify) or (-moz-text-align-last: justify)) {\n\n}");
237		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports((position:-webkit-sticky)or (position:sticky)) {}");
238		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports selector(h2 > p) {\n\n}");
239		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(selector(h2 > p)) {}", "@supports selector(h2 > p) {\n\n}");
240		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not selector(h2 > p) {\n\n}");
241		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not (selector(h2 > p)) {}", "@supports not selector(h2 > p) {\n\n}");
242	}
243}
css_ast/rules/supports.rs

css_ast/rules/
supports.rs
