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add attribute try_from

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This commit is contained in:
Zeyi Fan
2019-05-11 23:26:42 -07:00
parent 6dd2b4607f
commit 4c29eea790
11 changed files with 117 additions and 1 deletions
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serde_derive/src/internals/attr.rs
+14
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@@ -215,6 +215,7 @@ pub struct Container {
de_bound: Option<Vec<syn::WherePredicate>>,
tag: TagType,
type_from: Option<syn::Type>,
type_try_from: Option<syn::Type>,
type_into: Option<syn::Type>,
remote: Option<syn::Path>,
identifier: Identifier,
@@ -296,6 +297,7 @@ impl Container {
let mut internal_tag = Attr::none(cx, "tag");
let mut content = Attr::none(cx, "content");
let mut type_from = Attr::none(cx, "from");
let mut type_try_from = Attr::none(cx, "try_from");
let mut type_into = Attr::none(cx, "into");
let mut remote = Attr::none(cx, "remote");
let mut field_identifier = BoolAttr::none(cx, "field_identifier");
@@ -557,6 +559,13 @@ impl Container {
}
}
// Parse `#[serde(try_from = "Type")]
Meta(NameValue(ref m)) if m.ident == "try_from" => {
if let Ok(try_from_ty) = parse_lit_into_ty(cx, &m.ident, &m.lit) {
type_try_from.set_opt(&m.ident, Some(try_from_ty));
}
}
// Parse `#[serde(into = "Type")]
Meta(NameValue(ref m)) if m.ident == "into" => {
if let Ok(into_ty) = parse_lit_into_ty(cx, &m.ident, &m.lit) {
@@ -619,6 +628,7 @@ impl Container {
de_bound: de_bound.get(),
tag: decide_tag(cx, item, untagged, internal_tag, content),
type_from: type_from.get(),
type_try_from: type_try_from.get(),
type_into: type_into.get(),
remote: remote.get(),
identifier: decide_identifier(cx, item, field_identifier, variant_identifier),
@@ -663,6 +673,10 @@ impl Container {
self.type_from.as_ref()
}
pub fn type_try_from(&self) -> Option<&syn::Type> {
self.type_try_from.as_ref()
}
pub fn type_into(&self) -> Option<&syn::Type> {
self.type_into.as_ref()
}