INNER CODE UNIT · Rust

deserialize_enum_or_unknown

stepancheg/rust-protobuf · protobuf-examples/customize-serde/src/lib.rs:36

fn deserialize_enum_or_unknown<'de, E: EnumFull, D: serde::Deserializer<'de>>(
    d: D,
) -> Result<Option<EnumOrUnknown<E>>, D::Error> {
    struct DeserializeEnumVisitor<E: EnumFull>(PhantomData<E>);

    impl<'de, E: EnumFull> serde::de::Visitor<'de> for DeserializeEnumVisitor<E> {
        type Value = Option<EnumOrUnknown<E>>;

        fn expecting(&self, formatter: &mut Formatter) -> std::fmt::Result {
            write!(formatter, "a string, an integer or none")
        }

        fn visit_str<R>(self, v: &str) -> Result<Self::Value, R>
        where
            R: serde::de::Error,
        {
            match E::enum_descriptor().value_by_name(v) {
                Some(v) => Ok(Some(EnumOrUnknown::from_i32(v.value()))),

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