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review comment: use newtype to deduplicate logic

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This commit is contained in:
Esteban Kuber 2021-08-18 12:00:07 +00:00
parent 12a776b41d
commit 9349046ed5
1 changed files with 70 additions and 32 deletions
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98
compiler/rustc_resolve/src/late/diagnostics.rs
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@ -2073,48 +2073,86 @@ impl<'tcx> LifetimeContext<'_, 'tcx> {
continue;
}
});
let span_unnamed_borrow = |span: Span| {
let lo = span.lo() + BytePos(1);
span.with_lo(lo).with_hi(lo)
};
let span_underscore_borrow = |span: Span| {
let lo = span.lo() + BytePos(1);
struct Lifetime(Span, String);
impl Lifetime {
fn is_unnamed(&self) -> bool {
self.1.starts_with('&') && !self.1.starts_with("&'")
}
fn is_underscore(&self) -> bool {
self.1.starts_with("&'_ ")
}
fn is_named(&self) -> bool {
self.1.starts_with("&'")
}
fn suggestion(&self, sugg: String) -> Option<(Span, String)> {
Some(
match (
self.is_unnamed(),
self.is_underscore(),
self.is_named(),
sugg.starts_with("&"),
) {
(true, _, _, false) => (self.span_unnamed_borrow(), sugg),
(true, _, _, true) => {
(self.span_unnamed_borrow(), sugg[1..].to_string())
}
(_, true, _, false) => {
(self.span_underscore_borrow(), sugg.trim().to_string())
}
(_, true, _, true) => {
(self.span_underscore_borrow(), sugg[1..].trim().to_string())
}
(_, _, true, false) => {
(self.span_named_borrow(), sugg.trim().to_string())
}
(_, _, true, true) => {
(self.span_named_borrow(), sugg[1..].trim().to_string())
}
_ => return None,
},
)
}
fn span_unnamed_borrow(&self) -> Span {
let lo = self.0.lo() + BytePos(1);
self.0.with_lo(lo).with_hi(lo)
}
fn span_named_borrow(&self) -> Span {
let lo = self.0.lo() + BytePos(1);
self.0.with_lo(lo)
}
fn span_underscore_borrow(&self) -> Span {
let lo = self.0.lo() + BytePos(1);
let hi = lo + BytePos(2);
span.with_lo(lo).with_hi(hi)
};
let unnamed_borrow =
|snippet: &str| snippet.starts_with('&') && !snippet.starts_with("&'");
self.0.with_lo(lo).with_hi(hi)
}
}
for param in params {
if let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(param.span) {
if unnamed_borrow(&snippet) {
let span = span_unnamed_borrow(param.span);
introduce_suggestion.push((span, "'a ".to_string()));
} else if snippet.starts_with("&'_ ") {
let span = span_underscore_borrow(param.span);
introduce_suggestion.push((span, "'a".to_string()));
if let Some((span, sugg)) =
Lifetime(param.span, snippet).suggestion("'a ".to_string())
{
introduce_suggestion.push((span, sugg));
}
}
}
for (span, sugg) in spans_with_counts.iter().copied().zip(suggs.iter()).filter_map(
|((span, _), sugg)| match sugg {
Some(sugg) => Some((span, sugg)),
|((span, _), sugg)| match &sugg {
Some(sugg) => Some((span, sugg.to_string())),
_ => None,
},
) {
match self.tcx.sess.source_map().span_to_snippet(span) {
Ok(snippet) if unnamed_borrow(&snippet) && sugg.starts_with("&") => {
let span = span_unnamed_borrow(span);
introduce_suggestion.push((span, sugg[1..].to_string()));
}
Ok(snippet) if snippet.starts_with("&'_ ") && sugg.starts_with("&") => {
let span = span_underscore_borrow(span);
introduce_suggestion.push((span, sugg[1..].to_string()));
}
_ => {
let (span, sugg) = self
.tcx
.sess
.source_map()
.span_to_snippet(span)
.ok()
.and_then(|snippet| Lifetime(span, snippet).suggestion(sugg.clone()))
.unwrap_or((span, sugg));
introduce_suggestion.push((span, sugg.to_string()));
}
}
}
err.multipart_suggestion_with_style(
&msg,
introduce_suggestion,