css_parse/syntax/
unknown_rule_block.rs

1use crate::{
2	ComponentValues, Cursor, CursorSink, DeclarationValue, NodeMetadata, NodeWithMetadata, Parse, Parser, Peek, Result,
3	SemanticEq, Span, ToCursors, ToSpan,
4};
5
6/// Wrapper type for using ComponentValues as a rule type parameter in unknown rules.
7/// This implements RuleVariants to allow ComponentValues to be used as the block type
8/// for unknown qualified rules, where the rule structure is not recognized.
9#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
10#[cfg_attr(feature = "serde", derive(serde::Serialize), serde(transparent))]
11pub struct UnknownRuleBlock<'a, D = ComponentValues<'a>, M = ()> {
12	pub values: ComponentValues<'a>,
13	#[cfg_attr(feature = "serde", serde(skip))]
14	_phantom: std::marker::PhantomData<(D, M)>,
15}
16
17impl<'a, D, M> Parse<'a> for UnknownRuleBlock<'a, D, M> {
18	fn parse<Iter>(p: &mut Parser<'a, Iter>) -> Result<Self>
19	where
20		Iter: Iterator<Item = Cursor> + Clone,
21	{
22		ComponentValues::parse(p).map(|values| Self { values, _phantom: std::marker::PhantomData })
23	}
24}
25
26impl<'a, D, M> Peek<'a> for UnknownRuleBlock<'a, D, M> {
27	fn peek<Iter>(p: &Parser<'a, Iter>, c: Cursor) -> bool
28	where
29		Iter: Iterator<Item = Cursor> + Clone,
30	{
31		ComponentValues::peek(p, c)
32	}
33}
34
35impl<'a, D, M> ToCursors for UnknownRuleBlock<'a, D, M> {
36	fn to_cursors(&self, s: &mut impl CursorSink) {
37		self.values.to_cursors(s)
38	}
39}
40
41impl<'a, D, M> ToSpan for UnknownRuleBlock<'a, D, M> {
42	fn to_span(&self) -> Span {
43		self.values.to_span()
44	}
45}
46
47impl<'a, D, M> SemanticEq for UnknownRuleBlock<'a, D, M> {
48	fn semantic_eq(&self, other: &Self) -> bool {
49		self.values.semantic_eq(&other.values)
50	}
51}
52
53impl<'a, D, M: NodeMetadata> NodeWithMetadata<M> for UnknownRuleBlock<'a, D, M> {
54	fn metadata(&self) -> M {
55		self.values.metadata()
56	}
57}
58
59impl<'a, D, M> crate::RuleVariants<'a> for UnknownRuleBlock<'a, D, M>
60where
61	D: DeclarationValue<'a, M>,
62	M: NodeMetadata,
63{
64	type DeclarationValue = D;
65	type Metadata = M;
66
67	fn is_unknown(&self) -> bool {
68		// ComponentValues is a generic fallback container, not a specific rule type.
69		// It should be treated as unknown so it doesn't override actual declarations.
70		true
71	}
72}
css_parse/syntax/unknown_rule_block.rs

css_parse/syntax/
unknown_rule_block.rs
