use crate::err::Error;
use crate::scoring::Scoring;
use crate::value::serde::ser;
use ser::Serializer as _;
use serde::ser::Error as _;
use serde::ser::Impossible;
use serde::ser::Serialize;
pub(super) struct Serializer;
impl ser::Serializer for Serializer {
type Ok = Scoring;
type Error = Error;
type SerializeSeq = Impossible<Scoring, Error>;
type SerializeTuple = Impossible<Scoring, Error>;
type SerializeTupleStruct = Impossible<Scoring, Error>;
type SerializeTupleVariant = Impossible<Scoring, Error>;
type SerializeMap = Impossible<Scoring, Error>;
type SerializeStruct = Impossible<Scoring, Error>;
type SerializeStructVariant = SerializeScoring;
const EXPECTED: &'static str = "an enum `Scoring`";
#[inline]
fn serialize_unit_variant(
self,
name: &'static str,
_variant_index: u32,
variant: &'static str,
) -> Result<Self::Ok, Error> {
match variant {
"Vs" => Ok(Scoring::Vs),
variant => Err(Error::custom(format!("unexpected unit variant `{name}::{variant}`"))),
}
}
#[inline]
fn serialize_struct_variant(
self,
name: &'static str,
_variant_index: u32,
variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant, Self::Error> {
match (name, variant) {
("Scoring", "Bm") => Ok(SerializeScoring::Bm(Default::default())),
_ => Err(Error::custom(format!("unexpected `{name}::{variant}`"))),
}
}
}
pub(super) enum SerializeScoring {
Bm(SerializeBm),
}
impl serde::ser::SerializeStructVariant for SerializeScoring {
type Ok = Scoring;
type Error = Error;
fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<(), Error>
where
T: ?Sized + Serialize,
{
match self {
Self::Bm(bm) => bm.serialize_field(key, value),
}
}
fn end(self) -> Result<Self::Ok, Error> {
match self {
Self::Bm(bm) => bm.end(),
}
}
}
#[derive(Default)]
pub(super) struct SerializeBm {
k1: f32,
b: f32,
}
impl serde::ser::SerializeStructVariant for SerializeBm {
type Ok = Scoring;
type Error = Error;
fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<(), Error>
where
T: ?Sized + Serialize,
{
match key {
"k1" => {
self.k1 = value.serialize(ser::primitive::f32::Serializer.wrap())?;
}
"b" => {
self.b = value.serialize(ser::primitive::f32::Serializer.wrap())?;
}
key => {
return Err(Error::custom(format!("unexpected field `Scoring::Bm {{ {key} }}`")));
}
}
Ok(())
}
fn end(self) -> Result<Self::Ok, Error> {
Ok(Scoring::Bm {
k1: self.k1,
b: self.b,
})
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn vs() {
let idx = Scoring::Vs;
let serialized = idx.serialize(Serializer.wrap()).unwrap();
assert_eq!(idx, serialized);
}
#[test]
fn bm() {
let idx = Scoring::Bm {
k1: Default::default(),
b: Default::default(),
};
let serialized = idx.serialize(Serializer.wrap()).unwrap();
assert_eq!(idx, serialized);
}
}