blob: 4ebbdaf9aa9beb650bc712036228178eb4f61bc3 [file] [log] [blame]
use core::{
fmt::{self, Formatter},
marker::PhantomData,
};
use serde::{
de::{
value::SeqDeserializer, Deserialize, Deserializer, Error, IntoDeserializer, SeqAccess, Visitor,
},
ser::{Serialize, SerializeSeq, Serializer},
};
use crate::VecList;
impl<T: Serialize> Serialize for VecList<T> {
fn serialize<U: Serializer>(&self, serializer: U) -> Result<U::Ok, U::Error> {
let mut seq = serializer.serialize_seq(Some(self.len()))?;
for value in self.iter() {
seq.serialize_element(value)?;
}
seq.end()
}
}
struct VecListVisitor<T>(PhantomData<T>);
impl<'de, T: Deserialize<'de>> Visitor<'de> for VecListVisitor<T> {
type Value = VecList<T>;
fn expecting(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
write!(formatter, "a sequence")
}
fn visit_seq<A>(self, mut access: A) -> Result<Self::Value, A::Error>
where
A: SeqAccess<'de>,
{
let mut list = VecList::with_capacity(access.size_hint().unwrap_or_default());
while let Some(value) = access.next_element()? {
let _ = list.push_back(value);
}
Ok(list)
}
}
impl<'de, T: Deserialize<'de>> Deserialize<'de> for VecList<T> {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
deserializer.deserialize_seq(VecListVisitor(PhantomData))
}
}
impl<'de, T, E> IntoDeserializer<'de, E> for VecList<T>
where
T: IntoDeserializer<'de, E>,
E: Error,
{
type Deserializer = SeqDeserializer<<Self as IntoIterator>::IntoIter, E>;
fn into_deserializer(self) -> Self::Deserializer {
SeqDeserializer::new(self.into_iter())
}
}
#[allow(unused_results)]
#[cfg(test)]
mod test {
use coverage_helper::test;
use serde_test::{assert_de_tokens_error, assert_tokens, Token};
use super::*;
#[test]
fn test_de_error() {
assert_de_tokens_error::<VecList<u32>>(
&[Token::Map { len: Some(0) }],
"invalid type: map, expected a sequence",
);
}
#[test]
fn test_ser_de_empty() {
let list = VecList::<u32>::new();
assert_tokens(&list, &[Token::Seq { len: Some(0) }, Token::SeqEnd]);
}
#[test]
fn test_ser_de() {
let mut list = VecList::new();
list.push_back(0);
list.push_back(1);
list.push_back(2);
list.push_back(3);
list.push_back(4);
assert_tokens(
&list,
&[
Token::Seq { len: Some(5) },
Token::I32(0),
Token::I32(1),
Token::I32(2),
Token::I32(3),
Token::I32(4),
Token::SeqEnd,
],
);
}
}