css_parse/syntax/
bang_important.rs

1use crate::{Cursor, CursorSink, Diagnostic, Kind, Parse, Parser, Peek, Result, Span, T, ToCursors, ToSpan};
2
3/// Represents a two tokens, the first being [Kind::Delim] where the char is `!`, and the second being an `Ident` with
4/// the value `important`. [CSS defines this as]:
5///
6/// ```md
7/// <ws*>
8///     ╭──────────────────────────╮
9///  │├─╯─╭─ <whitespace-token> ─╮─╰─┤│
10///       ╰──────────────────────╯
11///
12/// <!important>
13///  │├─ "!" ─ <ws*> ─ <ident-token "important"> ─ <ws*> ─┤│
14/// ```
15///
16/// `<ws*>` is any number of `<whitespace-token>`s, defined as [Kind::Whitespace][Kind::Whitespace]. This is
17/// automatically skipped by default in the [Parser] anyway.
18///
19/// [1]: https://drafts.csswg.org/css-syntax-3/#!important-diagram
20///
21#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
22#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
23pub struct BangImportant {
24	pub bang: T![!],
25	pub important: T![Ident],
26}
27
28impl<'a> Peek<'a> for BangImportant {
29	fn peek<Iter>(p: &Parser<'a, Iter>, c: Cursor) -> bool
30	where
31		Iter: Iterator<Item = Cursor> + Clone,
32	{
33		if c == Kind::Delim && c == '!' {
34			let c = p.peek_n(2);
35			c == Kind::Ident && p.to_source_cursor(c).eq_ignore_ascii_case("important")
36		} else {
37			false
38		}
39	}
40}
41
42impl<'a> Parse<'a> for BangImportant {
43	fn parse<Iter>(p: &mut Parser<'a, Iter>) -> Result<Self>
44	where
45		Iter: Iterator<Item = Cursor> + Clone,
46	{
47		let bang = p.parse::<T![!]>()?;
48		let important = p.parse::<T![Ident]>()?;
49		if !p.to_source_cursor(important.into()).eq_ignore_ascii_case("important") {
50			Err(Diagnostic::new(important.into(), Diagnostic::unexpected_ident))?
51		}
52		Ok(Self { bang, important })
53	}
54}
55
56impl ToCursors for BangImportant {
57	fn to_cursors(&self, s: &mut impl CursorSink) {
58		s.append(self.bang.into());
59		s.append(self.important.into());
60	}
61}
62
63impl ToSpan for BangImportant {
64	fn to_span(&self) -> Span {
65		self.bang.to_span() + self.important.to_span()
66	}
67}
css_parse/syntax/bang_important.rs

css_parse/syntax/
bang_important.rs
