bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Streamline NamedMatch.

Browse source 
This commit combines `MatchedTokenTree` and `MatchedNonterminal`, which
are often considered together, into a single `MatchedSingle`. It shares
a representation with the newly-parameterized `ParseNtResult`.

This will also make things much simpler if/when variants from
`Interpolated` start being moved to `ParseNtResult`.
This commit is contained in:
Nicholas Nethercote 2024-03-19 13:33:33 +11:00
parent b7f3b714da
commit a94bb2a013
5 changed files with 42 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

17
compiler/rustc_expand/src/mbe/macro_parser.rs
View file

@ -392,12 +392,7 @@ pub(super) fn count_metavar_decls(matcher: &[TokenTree]) -> usize {
#[derive(Debug, Clone)]
pub(crate) enum NamedMatch {
MatchedSeq(Vec<NamedMatch>),
// A metavar match of type `tt`.
MatchedTokenTree(rustc_ast::tokenstream::TokenTree),
// A metavar match of any type other than `tt`.
MatchedNonterminal(Lrc<(Nonterminal, rustc_span::Span)>),
MatchedSingle(ParseNtResult<Lrc<(Nonterminal, Span)>>),
}
/// Performs a token equality check, ignoring syntax context (that is, an unhygienic comparison)
@ -691,11 +686,11 @@ impl TtParser {
}
Ok(nt) => nt,
};
let m = match nt {
ParseNtResult::Nt(nt) => MatchedNonterminal(Lrc::new((nt, span))),
ParseNtResult::Tt(tt) => MatchedTokenTree(tt),
};
mp.push_match(next_metavar, seq_depth, m);
mp.push_match(
next_metavar,
seq_depth,
MatchedSingle(nt.map_nt(|nt| (Lrc::new((nt, span))))),
);
mp.idx += 1;
} else {
unreachable!()