lightningcss/rules/
starting_style.rs

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1//! The `@starting-style` rule.
2
3use super::Location;
4use super::{CssRuleList, MinifyContext};
5use crate::error::{MinifyError, PrinterError};
6use crate::parser::DefaultAtRule;
7use crate::printer::Printer;
8use crate::traits::ToCss;
9#[cfg(feature = "visitor")]
10use crate::visitor::Visit;
11
12/// A [@starting-style](https://drafts.csswg.org/css-transitions-2/#defining-before-change-style-the-starting-style-rule) rule.
13#[derive(Debug, PartialEq, Clone)]
14#[cfg_attr(feature = "visitor", derive(Visit))]
15#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
16#[cfg_attr(feature = "jsonschema", derive(schemars::JsonSchema))]
17#[cfg_attr(feature = "into_owned", derive(static_self::IntoOwned))]
18pub struct StartingStyleRule<'i, R = DefaultAtRule> {
19  /// Nested rules within the `@starting-style` rule.
20  #[cfg_attr(feature = "serde", serde(borrow))]
21  pub rules: CssRuleList<'i, R>,
22  /// The location of the rule in the source file.
23  #[cfg_attr(feature = "visitor", skip_visit)]
24  pub loc: Location,
25}
26
27impl<'i, T: Clone> StartingStyleRule<'i, T> {
28  pub(crate) fn minify(
29    &mut self,
30    context: &mut MinifyContext<'_, 'i>,
31    parent_is_unused: bool,
32  ) -> Result<bool, MinifyError> {
33    self.rules.minify(context, parent_is_unused)?;
34    Ok(self.rules.0.is_empty())
35  }
36}
37
38impl<'i, T: ToCss> ToCss for StartingStyleRule<'i, T> {
39  fn to_css<W>(&self, dest: &mut Printer<W>) -> Result<(), PrinterError>
40  where
41    W: std::fmt::Write,
42  {
43    #[cfg(feature = "sourcemap")]
44    dest.add_mapping(self.loc);
45    dest.write_str("@starting-style")?;
46    dest.whitespace()?;
47    dest.write_char('{')?;
48    dest.indent();
49    dest.newline()?;
50    self.rules.to_css(dest)?;
51    dest.dedent();
52    dest.newline()?;
53    dest.write_char('}')
54  }
55}
lightningcss/rules/starting_style.rs

lightningcss/rules/
starting_style.rs
