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Produce error about mismatched types of #[serde(with = "...")] and #[…
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…serde(default = "...")] attributes on the attribute itself
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@Mingun
Mingun committed Jul 23, 2024
1 parent f6d7e8f commit 1865357
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Showing 3 changed files with 59 additions and 13 deletions.
55 changes: 47 additions & 8 deletions serde_derive/src/de.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -371,7 +371,11 @@ fn deserialize_transparent(cont: &Container, params: &Parameters) -> Fragment {
} else {
let value = match field.attrs.default() {
attr::Default::Default => quote!(_serde::__private::Default::default()),
attr::Default::Path(path) => quote!(#path()),
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(default = "...")]
// ^^^^^
attr::Default::Path(path) => quote_spanned!(path.span()=> #path()),
attr::Default::None => quote!(_serde::__private::PhantomData),
};
quote!(#member: #value)
Expand Down Expand Up @@ -751,7 +755,11 @@ fn deserialize_seq(
attr::Default::Default => Some(quote!(
let __default: Self::Value = _serde::__private::Default::default();
)),
attr::Default::Path(path) => Some(quote!(
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(default = "...")]
// ^^^^^
attr::Default::Path(path) => Some(quote_spanned!(path.span()=>
let __default: Self::Value = #path();
)),
attr::Default::None => {
Expand Down Expand Up @@ -833,7 +841,11 @@ fn deserialize_seq_in_place(
attr::Default::Default => Some(quote!(
let __default: #this_type #ty_generics = _serde::__private::Default::default();
)),
attr::Default::Path(path) => Some(quote!(
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(default = "...")]
// ^^^^^
attr::Default::Path(path) => Some(quote_spanned!(path.span()=>
let __default: #this_type #ty_generics = #path();
)),
attr::Default::None => {
Expand Down Expand Up @@ -867,7 +879,11 @@ fn deserialize_newtype_struct(
}
}
Some(path) => {
quote! {
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(with = "...")]
// ^^^^^
quote_spanned! {path.span()=>
#path(__e)?
}
}
Expand Down Expand Up @@ -2634,7 +2650,11 @@ fn deserialize_map(
attr::Default::Default => Some(quote!(
let __default: Self::Value = _serde::__private::Default::default();
)),
attr::Default::Path(path) => Some(quote!(
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(default = "...")]
// ^^^^^
attr::Default::Path(path) => Some(quote_spanned!(path.span()=>
let __default: Self::Value = #path();
)),
attr::Default::None => {
Expand Down Expand Up @@ -2801,7 +2821,11 @@ fn deserialize_map_in_place(
attr::Default::Default => Some(quote!(
let __default: #this_type #ty_generics = _serde::__private::Default::default();
)),
attr::Default::Path(path) => Some(quote!(
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(default = "...")]
// ^^^^^
attr::Default::Path(path) => Some(quote_spanned!(path.span()=>
let __default: #this_type #ty_generics = #path();
)),
attr::Default::None => {
Expand Down Expand Up @@ -2840,6 +2864,13 @@ fn wrap_deserialize_with(
split_with_de_lifetime(params);
let delife = params.borrowed.de_lifetime();

// If #deserialize_with returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(with = "...")]
// ^^^^^
let value = quote_spanned! {deserialize_with.span()=>
#deserialize_with(__deserializer)?
};
let wrapper = quote! {
#[doc(hidden)]
struct __DeserializeWith #de_impl_generics #where_clause {
Expand All @@ -2854,7 +2885,7 @@ fn wrap_deserialize_with(
__D: _serde::Deserializer<#delife>,
{
_serde::__private::Ok(__DeserializeWith {
value: #deserialize_with(__deserializer)?,
value: #value,
phantom: _serde::__private::PhantomData,
lifetime: _serde::__private::PhantomData,
})
Expand Down Expand Up @@ -2945,7 +2976,11 @@ fn expr_is_missing(field: &Field, cattrs: &attr::Container) -> Fragment {
return quote_expr!(#func());
}
attr::Default::Path(path) => {
return quote_expr!(#path());
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(default = "...")]
// ^^^^^
return Fragment::Expr(quote_spanned!(path.span()=> #path()));
}
attr::Default::None => { /* below */ }
}
Expand Down Expand Up @@ -2988,6 +3023,10 @@ fn expr_is_missing_seq(
return quote_spanned!(span=> #assign_to _serde::__private::Default::default());
}
attr::Default::Path(path) => {
// If #path returns wrong type, error will be reported here (^^^^^).
// We attach span of the path to the function so it will be reported
// on the #[serde(default = "...")]
// ^^^^^
return quote_spanned!(path.span()=> #assign_to #path());
}
attr::Default::None => { /* below */ }
Expand Down
9 changes: 5 additions & 4 deletions serde_derive/src/internals/attr.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ use std::iter::FromIterator;
use syn::meta::ParseNestedMeta;
use syn::parse::ParseStream;
use syn::punctuated::Punctuated;
use syn::spanned::Spanned;
use syn::{parse_quote, token, Ident, Lifetime, Token};

// This module handles parsing of `#[serde(...)]` attributes. The entrypoints
Expand Down Expand Up @@ -898,13 +899,13 @@ impl Variant {
ser_path
.path
.segments
.push(Ident::new("serialize", Span::call_site()).into());
.push(Ident::new("serialize", ser_path.span()).into());
serialize_with.set(&meta.path, ser_path);
let mut de_path = path;
de_path
.path
.segments
.push(Ident::new("deserialize", Span::call_site()).into());
.push(Ident::new("deserialize", de_path.span()).into());
deserialize_with.set(&meta.path, de_path);
}
} else if meta.path == SERIALIZE_WITH {
Expand Down Expand Up @@ -1180,13 +1181,13 @@ impl Field {
ser_path
.path
.segments
.push(Ident::new("serialize", Span::call_site()).into());
.push(Ident::new("serialize", ser_path.span()).into());
serialize_with.set(&meta.path, ser_path);
let mut de_path = path;
de_path
.path
.segments
.push(Ident::new("deserialize", Span::call_site()).into());
.push(Ident::new("deserialize", de_path.span()).into());
deserialize_with.set(&meta.path, de_path);
}
} else if meta.path == BOUND {
Expand Down
8 changes: 7 additions & 1 deletion serde_derive/src/ser.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1229,9 +1229,15 @@ fn wrap_serialize_with(
})
});

quote!({
// If #serialize_with returns wrong type, error will be reported on here.
// We attach span of the path to this piece so error will be reported
// on the #[serde(with = "...")]
// ^^^^^
quote_spanned!(serialize_with.span()=> {
#[doc(hidden)]
struct __SerializeWith #wrapper_impl_generics #where_clause {
// If #field_tys is empty, `values` does not used
#[allow(dead_code)]
values: (#(&'__a #field_tys, )*),
phantom: _serde::__private::PhantomData<#this_type #ty_generics>,
}
Expand Down

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