| 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, |
| ], |
| ); |
| } |
| } |