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Derive serialization for serde(flatten)

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Jan Michael Auer 2018-03-15 14:17:48 +01:00 committed by Armin Ronacher
parent 299cd2dbd0
commit 571bb8caed
1 changed files with 16 additions and 25 deletions
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41
serde_derive/src/ser.rs
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@ -286,7 +286,7 @@ fn serialize_struct_as_struct(params: &Parameters, fields: &[Field], cattrs: &at
}
}
fn serialize_struct_as_map(params: &Parameters, fields: &[Field], cattrs: &attr::Container) -> Fragment {
fn serialize_struct_as_map(params: &Parameters, fields: &[Field], _cattrs: &attr::Container) -> Fragment {
let serialize_fields = serialize_struct_visitor(
fields,
params,
@ -299,28 +299,13 @@ fn serialize_struct_as_map(params: &Parameters, fields: &[Field], cattrs: &attr:
.filter(|&field| !field.attrs.skip_serializing())
.peekable();
let mut collect_extra = None;
if cattrs.unknown_fields_into().is_some() {
if let Some(field) = fields
.iter()
.filter(|field| field.attrs.collection_field())
.next()
{
let ident = &field.ident;
collect_extra = Some(quote! {
for (ref __key, ref __value) in &self.#ident {
try!(_serde::ser::SerializeMap::serialize_entry(
&mut __serde_state,
__key,
__value));
}
});
}
}
let let_mut = mut_if(serialized_fields.peek().is_some());
let len = if collect_extra.is_some() {
let has_flatten = fields
.iter()
.any(|field| field.attrs.flatten());
let len = if has_flatten {
quote!(None)
} else {
let len = serialized_fields
@ -339,7 +324,6 @@ fn serialize_struct_as_map(params: &Parameters, fields: &[Field], cattrs: &attr:
quote_block! {
let #let_mut __serde_state = try!(_serde::Serializer::serialize_map(__serializer, #len));
#(#serialize_fields)*
#collect_extra
_serde::ser::SerializeMap::end(__serde_state)
}
}
@ -924,6 +908,7 @@ fn serialize_struct_visitor(
.filter(|&field| !field.attrs.skip_serializing())
.map(|field| {
let field_ident = field.ident.expect("struct has unnamed field");
let mut field_expr = if is_enum {
quote!(#field_ident)
} else {
@ -942,9 +927,15 @@ fn serialize_struct_visitor(
}
let span = Span::def_site().located_at(field.original.span());
let func = struct_trait.serialize_field(span);
let ser = quote! {
try!(#func(&mut __serde_state, #key_expr, #field_expr));
let ser = if field.attrs.flatten() {
quote! {
try!((#field_expr).serialize(_serde::private::ser::FlatSerializer(&mut __serde_state)));
}
} else {
let func = struct_trait.serialize_field(span);
quote! {
try!(#func(&mut __serde_state, #key_expr, #field_expr));
}
};
match skip {