alloy_eip8141/
macros.rs

1/// Implements the conversions shared by EIP-8141 `u8` discriminants.
2///
3/// Every discriminant gets `From<Self> for u8`, `TryFrom<u8>`, and quantity serde. Passing an RLP
4/// error message additionally implements the single-byte RLP encoding used on the wire.
5macro_rules! impl_u8_discriminant {
6    ($ty:ty, $error:ident) => {
7        impl From<$ty> for u8 {
8            fn from(value: $ty) -> Self {
9                value as Self
10            }
11        }
12
13        impl TryFrom<u8> for $ty {
14            type Error = crate::Eip8141Error;
15
16            fn try_from(value: u8) -> Result<Self, Self::Error> {
17                Self::try_from_u8(value).ok_or(crate::Eip8141Error::$error(value))
18            }
19        }
20
21        #[cfg(feature = "serde")]
22        impl serde::Serialize for $ty {
23            fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
24                crate::serde_utils::quantity_u8::serialize(&u8::from(*self), serializer)
25            }
26        }
27
28        #[cfg(feature = "serde")]
29        impl<'de> serde::Deserialize<'de> for $ty {
30            fn deserialize<D: serde::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
31                let value = crate::serde_utils::quantity_u8::deserialize(deserializer)?;
32                Self::try_from(value).map_err(serde::de::Error::custom)
33            }
34        }
35    };
36    ($ty:ty, $error:ident, $rlp_error:literal) => {
37        impl_u8_discriminant!($ty, $error);
38
39        impl alloy_rlp::Encodable for $ty {
40            fn encode(&self, out: &mut dyn alloy_rlp::BufMut) {
41                alloy_rlp::Encodable::encode(&u8::from(*self), out);
42            }
43
44            fn length(&self) -> usize {
45                alloy_rlp::Encodable::length(&u8::from(*self))
46            }
47        }
48
49        impl alloy_rlp::Decodable for $ty {
50            fn decode(buf: &mut &[u8]) -> alloy_rlp::Result<Self> {
51                Self::try_from_u8(<u8 as alloy_rlp::Decodable>::decode(buf)?)
52                    .ok_or(alloy_rlp::Error::Custom($rlp_error))
53            }
54        }
55    };
56}
alloy_eip8141/macros.rs

alloy_eip8141/
macros.rs
