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fix #104867, Properly handle postfix inc/dec in standalone and subexpr scenarios

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This commit is contained in:
yukang 2022-11-25 17:11:47 +08:00
parent 1dda298ad3
commit 7c11a53f9c
7 changed files with 188 additions and 64 deletions
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57
compiler/rustc_parse/src/parser/diagnostics.rs
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@ -159,8 +159,6 @@ enum IsStandalone {
Standalone,
/// It's a subexpression, i.e., *not* standalone.
Subexpr,
/// It's maybe standalone; we're not sure.
Maybe,
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
@ -213,14 +211,8 @@ impl MultiSugg {
err.multipart_suggestion(&self.msg, self.patches, self.applicability);
}
/// Overrides individual messages and applicabilities.
fn emit_many(
err: &mut Diagnostic,
msg: &str,
applicability: Applicability,
suggestions: impl Iterator<Item = Self>,
) {
err.multipart_suggestions(msg, suggestions.map(|s| s.patches), applicability);
fn emit_verbose(self, err: &mut Diagnostic) {
err.multipart_suggestion_verbose(&self.msg, self.patches, self.applicability);
}
}
@ -1272,7 +1264,6 @@ impl<'a> Parser<'a> {
let standalone =
if prev_is_semi { IsStandalone::Standalone } else { IsStandalone::Subexpr };
let kind = IncDecRecovery { standalone, op: IncOrDec::Inc, fixity: UnaryFixity::Pre };
self.recover_from_inc_dec(operand_expr, kind, op_span)
}
@ -1280,13 +1271,13 @@ impl<'a> Parser<'a> {
&mut self,
operand_expr: P<Expr>,
op_span: Span,
prev_is_semi: bool,
) -> PResult<'a, P<Expr>> {
let kind = IncDecRecovery {
standalone: IsStandalone::Maybe,
standalone: if prev_is_semi { IsStandalone::Standalone } else { IsStandalone::Subexpr },
op: IncOrDec::Inc,
fixity: UnaryFixity::Post,
};
self.recover_from_inc_dec(operand_expr, kind, op_span)
}
@ -1314,35 +1305,20 @@ impl<'a> Parser<'a> {
UnaryFixity::Post => (base.span.shrink_to_lo(), op_span),
};
let Ok(base_src) = self.span_to_snippet(base.span)
else { return help_base_case(err, base) };
match kind.standalone {
IsStandalone::Standalone => self.inc_dec_standalone_suggest(kind, spans).emit(&mut err),
IsStandalone::Subexpr => {
let Ok(base_src) = self.span_to_snippet(base.span)
else { return help_base_case(err, base) };
match kind.fixity {
UnaryFixity::Pre => {
self.prefix_inc_dec_suggest(base_src, kind, spans).emit(&mut err)
}
UnaryFixity::Post => {
self.postfix_inc_dec_suggest(base_src, kind, spans).emit(&mut err)
}
IsStandalone::Standalone => {
self.inc_dec_standalone_suggest(kind, spans).emit_verbose(&mut err)
}
IsStandalone::Subexpr => match kind.fixity {
UnaryFixity::Pre => {
self.prefix_inc_dec_suggest(base_src, kind, spans).emit(&mut err)
}
}
IsStandalone::Maybe => {
let Ok(base_src) = self.span_to_snippet(base.span)
else { return help_base_case(err, base) };
let sugg1 = match kind.fixity {
UnaryFixity::Pre => self.prefix_inc_dec_suggest(base_src, kind, spans),
UnaryFixity::Post => self.postfix_inc_dec_suggest(base_src, kind, spans),
};
let sugg2 = self.inc_dec_standalone_suggest(kind, spans);
MultiSugg::emit_many(
&mut err,
"use `+= 1` instead",
Applicability::Unspecified,
[sugg1, sugg2].into_iter(),
)
}
UnaryFixity::Post => {
self.postfix_inc_dec_suggest(base_src, kind, spans).emit(&mut err)
}
},
}
Err(err)
}
@ -1392,7 +1368,6 @@ impl<'a> Parser<'a> {
}
patches.push((post_span, format!(" {}= 1", kind.op.chr())));
MultiSugg {
msg: format!("use `{}= 1` instead", kind.op.chr()),
patches,