fn deserialize()

in src/scalar.rs [408:436]

• 25 lines of code
• 3 McCabe index (conditional complexity)

    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
        where D: Deserializer<'de>
    {
        struct ScalarVisitor;

        impl<'de> Visitor<'de> for ScalarVisitor {
            type Value = Scalar;

            fn expecting(&self, formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
                formatter.write_str("a valid point in Edwards y + sign format")
            }

            fn visit_seq<A>(self, mut seq: A) -> Result<Scalar, A::Error>
                where A: serde::de::SeqAccess<'de>
            {
                let mut bytes = [0u8; 32];
                for i in 0..32 {
                    bytes[i] = seq.next_element()?
                        .ok_or(serde::de::Error::invalid_length(i, &"expected 32 bytes"))?;
                }
                Scalar::from_canonical_bytes(bytes)
                    .ok_or(serde::de::Error::custom(
                        &"scalar was not canonically encoded"
                    ))
            }
        }

        deserializer.deserialize_tuple(32, ScalarVisitor)
    }