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macros: move suggestion type handling to fn

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Move the handling of `Span` or `(Span, Applicability)` types in
`#[suggestion]` attributes to its own function.

Signed-off-by: David Wood <david.wood@huawei.com>
This commit is contained in:
David Wood 2022-03-30 03:08:58 +01:00
parent 2bf64d6483
commit 8677fef192
1 changed files with 61 additions and 68 deletions
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129
compiler/rustc_macros/src/session_diagnostic.rs
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@ -430,74 +430,8 @@ impl<'a> SessionDiagnosticDeriveBuilder<'a> {
| suggestion_kind @ "suggestion_short"
| suggestion_kind @ "suggestion_hidden"
| suggestion_kind @ "suggestion_verbose" => {
// For suggest, we need to ensure we are running on a (Span,
// Applicability) pair.
let (span, applicability) = (|| match &info.ty {
ty @ syn::Type::Path(..)
if type_matches_path(ty, &["rustc_span", "Span"]) =>
{
let binding = &info.binding.binding;
Ok((
quote!(*#binding),
quote!(rustc_errors::Applicability::Unspecified),
))
}
syn::Type::Tuple(tup) => {
let mut span_idx = None;
let mut applicability_idx = None;
for (idx, elem) in tup.elems.iter().enumerate() {
if type_matches_path(elem, &["rustc_span", "Span"]) {
if span_idx.is_none() {
span_idx = Some(syn::Index::from(idx));
} else {
throw_span_err!(
info.span.unwrap(),
"type of field annotated with `#[suggestion(...)]` contains more than one Span"
);
}
} else if type_matches_path(
elem,
&["rustc_errors", "Applicability"],
) {
if applicability_idx.is_none() {
applicability_idx = Some(syn::Index::from(idx));
} else {
throw_span_err!(
info.span.unwrap(),
"type of field annotated with `#[suggestion(...)]` contains more than one Applicability"
);
}
}
}
if let Some(span_idx) = span_idx {
let binding = &info.binding.binding;
let span = quote!(#binding.#span_idx);
let applicability = applicability_idx
.map(
|applicability_idx| quote!(#binding.#applicability_idx),
)
.unwrap_or_else(|| {
quote!(rustc_errors::Applicability::Unspecified)
});
return Ok((span, applicability));
}
throw_span_err!(
info.span.unwrap(),
"wrong types for suggestion",
|diag| {
diag.help("#[suggestion(...)] on a tuple field must be applied to fields of type (Span, Applicability)")
}
);
}
_ => throw_span_err!(
info.span.unwrap(),
"wrong field type for suggestion",
|diag| {
diag.help("#[suggestion(...)] should be applied to fields of type Span or (Span, Applicability)")
}
),
})()?;
// Now read the key-value pairs.
let (span, applicability) = self.span_and_applicability_of_ty(info)?;
let mut msg = None;
let mut code = None;
@ -562,6 +496,65 @@ impl<'a> SessionDiagnosticDeriveBuilder<'a> {
})
}
fn span_and_applicability_of_ty(
&self,
info: FieldInfo<'_>,
) -> Result<(proc_macro2::TokenStream, proc_macro2::TokenStream), SessionDiagnosticDeriveError>
{
match &info.ty {
// If `ty` is `Span` w/out applicability, then use `Applicability::Unspecified`.
ty @ syn::Type::Path(..) if type_matches_path(ty, &["rustc_span", "Span"]) => {
let binding = &info.binding.binding;
Ok((quote!(*#binding), quote!(rustc_errors::Applicability::Unspecified)))
}
// If `ty` is `(Span, Applicability)` then return tokens accessing those.
syn::Type::Tuple(tup) => {
let mut span_idx = None;
let mut applicability_idx = None;
for (idx, elem) in tup.elems.iter().enumerate() {
if type_matches_path(elem, &["rustc_span", "Span"]) {
if span_idx.is_none() {
span_idx = Some(syn::Index::from(idx));
} else {
throw_span_err!(
info.span.unwrap(),
"type of field annotated with `#[suggestion(...)]` contains more than one Span"
);
}
} else if type_matches_path(elem, &["rustc_errors", "Applicability"]) {
if applicability_idx.is_none() {
applicability_idx = Some(syn::Index::from(idx));
} else {
throw_span_err!(
info.span.unwrap(),
"type of field annotated with `#[suggestion(...)]` contains more than one Applicability"
);
}
}
}
if let Some(span_idx) = span_idx {
let binding = &info.binding.binding;
let span = quote!(#binding.#span_idx);
let applicability = applicability_idx
.map(|applicability_idx| quote!(#binding.#applicability_idx))
.unwrap_or_else(|| quote!(rustc_errors::Applicability::Unspecified));
return Ok((span, applicability));
}
throw_span_err!(info.span.unwrap(), "wrong types for suggestion", |diag| {
diag.help("#[suggestion(...)] on a tuple field must be applied to fields of type `(Span, Applicability)`")
});
}
// If `ty` isn't a `Span` or `(Span, Applicability)` then emit an error.
_ => throw_span_err!(info.span.unwrap(), "wrong field type for suggestion", |diag| {
diag.help("#[suggestion(...)] should be applied to fields of type `Span` or `(Span, Applicability)`")
}),
}
}
/// In the strings in the attributes supplied to this macro, we want callers to be able to
/// reference fields in the format string. For example:
///