bjoernager/rust
bjoernager/rust
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delegation: Implement list delegation

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```rust
reuse prefix::{a, b, c}
```
This commit is contained in:
Vadim Petrochenkov 2024-03-15 14:21:03 +03:00
parent 8387315ab3
commit c30b41012d
29 changed files with 511 additions and 60 deletions
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35
compiler/rustc_parse/src/parser/item.rs
View file

@ -685,20 +685,35 @@ impl<'a> Parser<'a> {
(None, self.parse_path(PathStyle::Expr)?)
};
let rename = if self.eat_keyword(kw::As) { Some(self.parse_ident()?) } else { None };
let body = if self.check(&token::OpenDelim(Delimiter::Brace)) {
Some(self.parse_block()?)
} else {
self.expect(&token::Semi)?;
None
let rename = |this: &mut Self| {
Ok(if this.eat_keyword(kw::As) { Some(this.parse_ident()?) } else { None })
};
let body = |this: &mut Self| {
Ok(if this.check(&token::OpenDelim(Delimiter::Brace)) {
Some(this.parse_block()?)
} else {
this.expect(&token::Semi)?;
None
})
};
let (ident, item_kind) = if self.eat(&token::PathSep) {
let (suffixes, _) = self.parse_delim_comma_seq(Delimiter::Brace, |p| {
Ok((p.parse_path_segment_ident()?, rename(p)?))
})?;
let deleg = DelegationMac { qself, prefix: path, suffixes, body: body(self)? };
(Ident::empty(), ItemKind::DelegationMac(Box::new(deleg)))
} else {
let rename = rename(self)?;
let ident = rename.unwrap_or_else(|| path.segments.last().unwrap().ident);
let deleg = Delegation { id: DUMMY_NODE_ID, qself, path, rename, body: body(self)? };
(ident, ItemKind::Delegation(Box::new(deleg)))
};
let span = span.to(self.prev_token.span);
self.psess.gated_spans.gate(sym::fn_delegation, span);
let ident = rename.unwrap_or_else(|| path.segments.last().unwrap().ident);
let deleg = Delegation { id: DUMMY_NODE_ID, qself, path, rename, body };
Ok((ident, ItemKind::Delegation(Box::new(deleg))))
Ok((ident, item_kind))
}
fn parse_item_list<T>(

7
compiler/rustc_parse/src/parser/path.rs
View file

@ -95,12 +95,15 @@ impl<'a> Parser<'a> {
debug!("parse_qpath: (decrement) count={:?}", self.unmatched_angle_bracket_count);
}
if !self.recover_colon_before_qpath_proj() {
let is_import_coupler = self.is_import_coupler();
if !is_import_coupler && !self.recover_colon_before_qpath_proj() {
self.expect(&token::PathSep)?;
}
let qself = P(QSelf { ty, path_span, position: path.segments.len() });
self.parse_path_segments(&mut path.segments, style, None)?;
if !is_import_coupler {
self.parse_path_segments(&mut path.segments, style, None)?;
}
Ok((
qself,