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lib.rs
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lib.rs
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mod visitor;
use std::slice;
use serde::{
Deserialize, Serialize,
ser::{Serializer, SerializeStruct},
de::Deserializer,
};
use visitor::TaggedVisitor;
pub fn tagged_de<'de, T, D>(des: D, ty: &'static str, tag: &'static &'static str) -> Result<T, D::Error>
where
T: Deserialize<'de>,
D: Deserializer<'de>,
{
des.deserialize_struct(ty, slice::from_ref(&tag), TaggedVisitor::new(tag))
}
pub fn tagged_ser<T, S>(val: &T, ser: S, ty: &'static str, tag: &'static str) -> Result<S::Ok, S::Error>
where
T: Serialize,
S: Serializer,
{
let mut sv = ser.serialize_struct(ty, 1)?;
sv.serialize_field(tag, val)?;
sv.end()
}
#[cfg(test)]
mod tests {
use serde::{Deserialize, Serialize};
#[derive(Debug, PartialEq, Deserialize, Serialize)]
#[serde(untagged)]
enum Enum {
#[serde(with = "tagged_i32")]
TaggedI32(i32),
#[serde(with = "tagged_string")]
TaggedString(String),
Untagged {
x: i32,
y: i32
}
}
mod tagged_i32 {
use serde::{Deserializer, Serializer};
use crate::{tagged_ser, tagged_de};
pub fn deserialize<'de, D>(deserializer: D) -> Result<i32, D::Error>
where
D: Deserializer<'de>
{
tagged_de(deserializer, "TaggedI32", &"tagged_i32")
}
pub fn serialize<S>(val: &i32, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer
{
tagged_ser(val, serializer, "TaggedI32", "tagged_i32")
}
}
mod tagged_string {
use serde::{Deserializer, Serializer};
use crate::{tagged_ser, tagged_de};
pub fn deserialize<'de, D>(deserializer: D) -> Result<String, D::Error>
where
D: Deserializer<'de>
{
tagged_de(deserializer, "TaggedString", &"tagged_string")
}
pub fn serialize<S>(val: &String, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer
{
tagged_ser(val, serializer, "TaggedString", "tagged_string")
}
}
#[test]
fn ser_tagged_i32() {
assert_eq!(
serde_json::to_string(&Enum::TaggedI32(123)).unwrap(),
String::from(r#"{"tagged_i32":123}"#)
);
}
#[test]
fn ser_tagged_string() {
assert_eq!(
serde_json::to_string(&Enum::TaggedString(String::from("str"))).unwrap(),
String::from(r#"{"tagged_string":"str"}"#)
);
}
#[test]
fn ser_untagged() {
assert_eq!(
serde_json::to_string(&Enum::Untagged { x: 42, y: 17 }).unwrap(),
String::from(r#"{"x":42,"y":17}"#)
);
}
#[test]
fn de_tagged_i32() {
assert_eq!(
serde_json::from_str::<Enum>(r#"{"tagged_i32":123}"#).unwrap(),
Enum::TaggedI32(123)
);
}
#[test]
fn de_tagged_string() {
assert_eq!(
serde_json::from_str::<Enum>(r#"{"tagged_string":"str"}"#).unwrap(),
Enum::TaggedString(String::from("str"))
);
}
#[test]
fn de_untagged() {
assert_eq!(
serde_json::from_str::<Enum>(r#"{"x":42,"y":17}"#).unwrap(),
Enum::Untagged { x: 42, y: 17 }
);
}
}