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Move all the deserialize_from derive code behind flag

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This commit is contained in:
David Tolnay 2017-12-10 23:12:54 -08:00
parent 85e3ddc2b8
commit d9e894911f
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 24 additions and 21 deletions
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45
serde_derive/src/de.rs
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@ -40,18 +40,7 @@ pub fn expand_derive_deserialize(input: &syn::DeriveInput) -> Result<Tokens, Str
}
}
} else {
let from_body = deserialize_from_body(&cont, &params);
let from_impl = from_body.map(|from_body| {
let from_body = Stmts(from_body);
quote! {
fn deserialize_from<__D>(&mut self, __deserializer: __D) -> _serde::export::Result<(), __D::Error>
where __D: _serde::Deserializer<#delife>
{
#from_body
}
}
});
let fn_deserialize_from = deserialize_from_body(&cont, &params);
quote! {
#[automatically_derived]
@ -62,7 +51,7 @@ pub fn expand_derive_deserialize(input: &syn::DeriveInput) -> Result<Tokens, Str
#main_body
}
#from_impl
#fn_deserialize_from
}
}
};
@ -261,7 +250,7 @@ fn deserialize_body(cont: &Container, params: &Parameters) -> Fragment {
}
#[cfg(feature = "deserialize_from")]
fn deserialize_from_body(cont: &Container, params: &Parameters) -> Option<Fragment> {
fn deserialize_from_body(cont: &Container, params: &Parameters) -> Option<Stmts> {
// Only remote derives have getters, and we do not generate deserialize_from
// for remote derives.
assert!(!params.has_getter);
@ -273,21 +262,35 @@ fn deserialize_from_body(cont: &Container, params: &Parameters) -> Option<Fragme
return None;
}
match cont.body {
Body::Enum(_) => None,
let code = match cont.body {
Body::Struct(Style::Struct, ref fields) => {
Some(deserialize_from_struct(None, params, fields, &cont.attrs, None, Untagged::No))
deserialize_from_struct(None, params, fields, &cont.attrs, None, Untagged::No)
}
Body::Struct(Style::Tuple, ref fields) |
Body::Struct(Style::Newtype, ref fields) => {
Some(deserialize_from_tuple(None, params, fields, &cont.attrs, None))
deserialize_from_tuple(None, params, fields, &cont.attrs, None)
}
Body::Struct(Style::Unit, _) => None,
}
Body::Enum(_) | Body::Struct(Style::Unit, _) => {
return None;
}
};
let delife = params.borrowed.de_lifetime();
let stmts = Stmts(code);
let fn_deserialize_from = quote_block! {
fn deserialize_from<__D>(&mut self, __deserializer: __D) -> _serde::export::Result<(), __D::Error>
where __D: _serde::Deserializer<#delife>
{
#stmts
}
};
Some(Stmts(fn_deserialize_from))
}
#[cfg(not(feature = "deserialize_from"))]
fn deserialize_from_body(_cont: &Container, _params: &Parameters) -> Option<Fragment> {
fn deserialize_from_body(_cont: &Container, _params: &Parameters) -> Option<Stmts> {
None
}