core-json-traits 0.4.1

Traits for working with `JSON`-serialized objects
Documentation 
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use crate::{Read, Stack, JsonError, Type, Value, JsonDeserialize, JsonSerialize};

impl<T: JsonDeserialize> JsonDeserialize for Option<T> {
  /// This will accept `null` as a representation of `None`.
  fn deserialize<'read, 'parent, B: Read<'read>, S: Stack>(
    mut value: Value<'read, 'parent, B, S>,
  ) -> Result<Self, JsonError<'read, B, S>> {
    if matches!(value.kind()?, Type::Null) {
      let () = value.to_null()?;
      return Ok(None);
    }
    T::deserialize(value).map(Some)
  }
}

impl<T: JsonSerialize> JsonSerialize for Option<T> {
  /// This will serialize `Some(value)` as `value` and `None` as `null`.
  fn serialize(&self) -> impl Iterator<Item = char> {
    self
      .as_ref()
      .map(|value| T::serialize(value))
      .into_iter()
      .flatten()
      .chain(self.is_none().then(|| "null".chars()).into_iter().flatten())
  }
}