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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/check.rs
+17
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@@ -13,6 +13,7 @@ pub fn check(cx: &Ctxt, cont: &mut Container, derive: Derive) {
check_internal_tag_field_name_conflict(cx, cont);
check_adjacent_tag_conflict(cx, cont);
check_transparent(cx, cont, derive);
check_from_and_try_from(cx, cont);
}
/// Getters are only allowed inside structs (not enums) with the `remote`
@@ -330,6 +331,13 @@ fn check_transparent(cx: &Ctxt, cont: &mut Container, derive: Derive) {
);
}
if cont.attrs.type_try_from().is_some() {
cx.error_spanned_by(
cont.original,
"#[serde(transparent)] is not allowed with #[serde(try_from = \"...\")]",
);
}
if cont.attrs.type_into().is_some() {
cx.error_spanned_by(
cont.original,
@@ -410,3 +418,12 @@ fn allow_transparent(field: &Field, derive: Derive) -> bool {
Derive::Deserialize => !field.attrs.skip_deserializing() && field.attrs.default().is_none(),
}
}
fn check_from_and_try_from(cx: &Ctxt, cont: &mut Container) {
if cont.attrs.type_from().is_some() && cont.attrs.type_try_from().is_some() {
cx.error_spanned_by(
cont.original,
"#[serde(from = \"...\")] and #[serde(try_from = \"...\")] conflict with each other",
);
}
}