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//! Serde serialization/deserialization implementation
use core::fmt;
use core::marker::PhantomData;
use serde::de::{self, SeqAccess, Visitor};
use serde::{ser::SerializeTuple, Deserialize, Deserializer, Serialize, Serializer};
use {ArrayLength, GenericArray};
impl<T, N> Serialize for GenericArray<T, N>
where
T: Serialize,
N: ArrayLength<T>,
{
#[inline]
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut tup = serializer.serialize_tuple(N::to_usize())?;
for el in self {
tup.serialize_element(el)?;
}
tup.end()
}
}
struct GAVisitor<T, N> {
_t: PhantomData<T>,
_n: PhantomData<N>,
}
impl<'de, T, N> Visitor<'de> for GAVisitor<T, N>
where
T: Deserialize<'de> + Default,
N: ArrayLength<T>,
{
type Value = GenericArray<T, N>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("struct GenericArray")
}
fn visit_seq<A>(self, mut seq: A) -> Result<GenericArray<T, N>, A::Error>
where
A: SeqAccess<'de>,
{
let mut result = GenericArray::default();
for i in 0..N::to_usize() {
result[i] = seq
.next_element()?
.ok_or_else(|| de::Error::invalid_length(i, &self))?;
}
Ok(result)
}
}
impl<'de, T, N> Deserialize<'de> for GenericArray<T, N>
where
T: Deserialize<'de> + Default,
N: ArrayLength<T>,
{
fn deserialize<D>(deserializer: D) -> Result<GenericArray<T, N>, D::Error>
where
D: Deserializer<'de>,
{
let visitor = GAVisitor {
_t: PhantomData,
_n: PhantomData,
};
deserializer.deserialize_tuple(N::to_usize(), visitor)
}
}
#[cfg(test)]
mod tests {
use super::*;
use bincode;
use typenum;
#[test]
fn test_serialize() {
let array = GenericArray::<u8, typenum::U2>::default();
let serialized = bincode::serialize(&array);
assert!(serialized.is_ok());
}
#[test]
fn test_deserialize() {
let mut array = GenericArray::<u8, typenum::U2>::default();
array[0] = 1;
array[1] = 2;
let serialized = bincode::serialize(&array).unwrap();
let deserialized = bincode::deserialize::<GenericArray<u8, typenum::U2>>(&array);
assert!(deserialized.is_ok());
let array = deserialized.unwrap();
assert_eq!(array[0], 1);
assert_eq!(array[1], 2);
}
#[test]
fn test_serialized_size() {
let array = GenericArray::<u8, typenum::U1>::default();
let size = bincode::serialized_size(&array).unwrap();
assert_eq!(size, 1);
}
}
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