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Move body generator for unit structs to its own module

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Mingun 2025-09-20 00:10:10 +05:00
parent c4986f10b9
commit c4a07ed4e8
2 changed files with 53 additions and 47 deletions
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49
serde_derive/src/de.rs
View File

@ -19,6 +19,7 @@ mod enum_internally;
mod enum_untagged;
mod struct_;
mod tuple;
mod unit;
pub fn expand_derive_deserialize(input: &mut syn::DeriveInput) -> syn::Result<TokenStream> {
replace_receiver(input);
@ -317,7 +318,7 @@ fn deserialize_body(cont: &Container, params: &Parameters) -> Fragment {
Data::Struct(Style::Tuple, fields) | Data::Struct(Style::Newtype, fields) => {
tuple::deserialize_tuple(params, fields, &cont.attrs, TupleForm::Tuple)
}
Data::Struct(Style::Unit, _) => deserialize_unit_struct(params, &cont.attrs),
Data::Struct(Style::Unit, _) => unit::deserialize_unit_struct(params, &cont.attrs),
}
} else {
match &cont.data {
@ -438,52 +439,6 @@ fn deserialize_try_from(type_try_from: &syn::Type) -> Fragment {
}
}
/// Generates `Deserialize::deserialize` body for a `struct Unit;`
fn deserialize_unit_struct(params: &Parameters, cattrs: &attr::Container) -> Fragment {
let this_type = &params.this_type;
let this_value = &params.this_value;
let type_name = cattrs.name().deserialize_name();
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = params.generics();
let delife = params.borrowed.de_lifetime();
let expecting = format!("unit struct {}", params.type_name());
let expecting = cattrs.expecting().unwrap_or(&expecting);
quote_block! {
#[doc(hidden)]
struct __Visitor #de_impl_generics #where_clause {
marker: _serde::#private::PhantomData<#this_type #ty_generics>,
lifetime: _serde::#private::PhantomData<&#delife ()>,
}
#[automatically_derived]
impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause {
type Value = #this_type #ty_generics;
fn expecting(&self, __formatter: &mut _serde::#private::Formatter) -> _serde::#private::fmt::Result {
_serde::#private::Formatter::write_str(__formatter, #expecting)
}
#[inline]
fn visit_unit<__E>(self) -> _serde::#private::Result<Self::Value, __E>
where
__E: _serde::de::Error,
{
_serde::#private::Ok(#this_value)
}
}
_serde::Deserializer::deserialize_unit_struct(
__deserializer,
#type_name,
__Visitor {
marker: _serde::#private::PhantomData::<#this_type #ty_generics>,
lifetime: _serde::#private::PhantomData,
},
)
}
}
enum TupleForm<'a> {
Tuple,
/// Contains a variant name

51
serde_derive/src/de/unit.rs Normal file
View File

@ -0,0 +1,51 @@
use crate::de::Parameters;
use crate::fragment::Fragment;
use crate::internals::attr;
use crate::private;
use quote::quote;
/// Generates `Deserialize::deserialize` body for a `struct Unit;`
pub fn deserialize_unit_struct(params: &Parameters, cattrs: &attr::Container) -> Fragment {
let this_type = &params.this_type;
let this_value = &params.this_value;
let type_name = cattrs.name().deserialize_name();
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = params.generics();
let delife = params.borrowed.de_lifetime();
let expecting = format!("unit struct {}", params.type_name());
let expecting = cattrs.expecting().unwrap_or(&expecting);
quote_block! {
#[doc(hidden)]
struct __Visitor #de_impl_generics #where_clause {
marker: _serde::#private::PhantomData<#this_type #ty_generics>,
lifetime: _serde::#private::PhantomData<&#delife ()>,
}
#[automatically_derived]
impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause {
type Value = #this_type #ty_generics;
fn expecting(&self, __formatter: &mut _serde::#private::Formatter) -> _serde::#private::fmt::Result {
_serde::#private::Formatter::write_str(__formatter, #expecting)
}
#[inline]
fn visit_unit<__E>(self) -> _serde::#private::Result<Self::Value, __E>
where
__E: _serde::de::Error,
{
_serde::#private::Ok(#this_value)
}
}
_serde::Deserializer::deserialize_unit_struct(
__deserializer,
#type_name,
__Visitor {
marker: _serde::#private::PhantomData::<#this_type #ty_generics>,
lifetime: _serde::#private::PhantomData,
},
)
}
}