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Merge pull request 1526 from fanzeyi/try_from

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This commit is contained in:
David Tolnay
2019-07-17 12:16:31 -07:00
parent cf32a5b204 4c29eea790
commit 92e0b62c6b
11 changed files with 117 additions and 1 deletions
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serde_derive/src/de.rs
+11
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@@ -269,6 +269,8 @@ fn deserialize_body(cont: &Container, params: &Parameters) -> Fragment {
deserialize_transparent(cont, params)
} else if let Some(type_from) = cont.attrs.type_from() {
deserialize_from(type_from)
} else if let Some(type_try_from) = cont.attrs.type_try_from() {
deserialize_try_from(type_try_from)
} else if let attr::Identifier::No = cont.attrs.identifier() {
match cont.data {
Data::Enum(ref variants) => deserialize_enum(params, variants, &cont.attrs),
@@ -298,6 +300,7 @@ fn deserialize_in_place_body(cont: &Container, params: &Parameters) -> Option<St
if cont.attrs.transparent()
|| cont.attrs.type_from().is_some()
|| cont.attrs.type_try_from().is_some()
|| cont.attrs.identifier().is_some()
|| cont
.data
@@ -390,6 +393,14 @@ fn deserialize_from(type_from: &syn::Type) -> Fragment {
}
}
fn deserialize_try_from(type_try_from: &syn::Type) -> Fragment {
quote_block! {
_serde::export::Result::and_then(
<#type_try_from as _serde::Deserialize>::deserialize(__deserializer),
|v| _serde::export::TryFrom::try_from(v).map_err(_serde::de::Error::custom))
}
}
fn deserialize_unit_struct(params: &Parameters, cattrs: &attr::Container) -> Fragment {
let this = &params.this;
let type_name = cattrs.name().deserialize_name();