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Introduce bound attribute on enum variants

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This commit is contained in:
David Tolnay
2018-05-08 10:07:17 -07:00
parent b4076f4577
commit be7fe2a5eb
5 changed files with 98 additions and 0 deletions
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serde_derive/src/internals/attr.rs
+32
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@@ -527,6 +527,8 @@ pub struct Variant {
ser_renamed: bool,
de_renamed: bool,
rename_all: RenameRule,
ser_bound: Option<Vec<syn::WherePredicate>>,
de_bound: Option<Vec<syn::WherePredicate>>,
skip_deserializing: bool,
skip_serializing: bool,
other: bool,
@@ -542,6 +544,8 @@ impl Variant {
let mut skip_deserializing = BoolAttr::none(cx, "skip_deserializing");
let mut skip_serializing = BoolAttr::none(cx, "skip_serializing");
let mut rename_all = Attr::none(cx, "rename_all");
let mut ser_bound = Attr::none(cx, "bound");
let mut de_bound = Attr::none(cx, "bound");
let mut other = BoolAttr::none(cx, "other");
let mut serialize_with = Attr::none(cx, "serialize_with");
let mut deserialize_with = Attr::none(cx, "deserialize_with");
@@ -601,6 +605,24 @@ impl Variant {
other.set_true();
}
// Parse `#[serde(bound = "D: Serialize")]`
Meta(NameValue(ref m)) if m.ident == "bound" => {
if let Ok(where_predicates) =
parse_lit_into_where(cx, m.ident.as_ref(), m.ident.as_ref(), &m.lit)
{
ser_bound.set(where_predicates.clone());
de_bound.set(where_predicates);
}
}
// Parse `#[serde(bound(serialize = "D: Serialize", deserialize = "D: Deserialize"))]`
Meta(List(ref m)) if m.ident == "bound" => {
if let Ok((ser, de)) = get_where_predicates(cx, &m.nested) {
ser_bound.set_opt(ser);
de_bound.set_opt(de);
}
}
// Parse `#[serde(with = "...")]`
Meta(NameValue(ref m)) if m.ident == "with" => {
if let Ok(path) = parse_lit_into_expr_path(cx, m.ident.as_ref(), &m.lit) {
@@ -669,6 +691,8 @@ impl Variant {
ser_renamed: ser_renamed,
de_renamed: de_renamed,
rename_all: rename_all.get().unwrap_or(RenameRule::None),
ser_bound: ser_bound.get(),
de_bound: de_bound.get(),
skip_deserializing: skip_deserializing.get(),
skip_serializing: skip_serializing.get(),
other: other.get(),
@@ -695,6 +719,14 @@ impl Variant {
&self.rename_all
}
pub fn ser_bound(&self) -> Option<&[syn::WherePredicate]> {
self.ser_bound.as_ref().map(|vec| &vec[..])
}
pub fn de_bound(&self) -> Option<&[syn::WherePredicate]> {
self.de_bound.as_ref().map(|vec| &vec[..])
}
pub fn skip_deserializing(&self) -> bool {
self.skip_deserializing
}