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style: Reduce some code duplication and ugliness when parsing identifiers.

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This commit is contained in:
Emilio Cobos Álvarez 2017-06-10 15:07:33 +02:00
parent ddfe8b0468
commit e3c4d03bde
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12 changed files with 104 additions and 134 deletions
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24
components/style/macros.rs
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@ -4,6 +4,24 @@
//! Various macro helpers.
/// A macro to parse an identifier, or return an `UnexpectedIndent` error
/// otherwise.
///
/// FIXME(emilio): The fact that `UnexpectedIdent` is a `SelectorParseError`
/// doesn't make a lot of sense to me.
macro_rules! try_match_ident_ignore_ascii_case {
($ident:expr, $( $match_body:tt )*) => {
let __ident = $ident;
(match_ignore_ascii_case! { &*__ident,
$( $match_body )*
_ => Err(()),
})
.map_err(|()| {
::selectors::parser::SelectorParseError::UnexpectedIdent(__ident).into()
})
}
}
macro_rules! define_numbered_css_keyword_enum {
($name: ident: $( $css: expr => $variant: ident = $value: expr ),+,) => {
define_numbered_css_keyword_enum!($name: $( $css => $variant = $value ),+);
@ -21,11 +39,9 @@ macro_rules! define_numbered_css_keyword_enum {
fn parse<'i, 't>(_context: &$crate::parser::ParserContext,
input: &mut ::cssparser::Parser<'i, 't>)
-> Result<$name, ::style_traits::ParseError<'i>> {
let ident = try!(input.expect_ident());
(match_ignore_ascii_case! { &ident,
try_match_ident_ignore_ascii_case! { input.expect_ident()?,
$( $css => Ok($name::$variant), )+
_ => Err(())
}).map_err(|()| ::selectors::parser::SelectorParseError::UnexpectedIdent(ident).into())
}
}
}