use core::marker::PhantomData;
use serde::ser::{Error, Impossible, Serialize, SerializeMap, Serializer};
use crate::{Field, SerializeFilter, SerializePartial};
pub(crate) struct PartialSerializeMap<'a, S, T, F>
where
S: Serializer,
T: ?Sized,
{
pub(crate) sm: S::SerializeMap,
pub(crate) filter: &'a F,
pub(crate) _ty: PhantomData<T>,
}
struct KeySerializer<'a, T, F, E>
where
T: ?Sized,
{
filter: &'a F,
_ty: PhantomData<(&'a T, E)>,
}
impl<'a, S, T, F> SerializeMap for PartialSerializeMap<'a, S, T, F>
where
S: Serializer,
T: ?Sized + for<'p> SerializePartial<'p>,
F: SerializeFilter<T>,
{
type Ok = <S::SerializeMap as SerializeMap>::Ok;
type Error = <S::SerializeMap as SerializeMap>::Error;
fn serialize_key<K: ?Sized>(&mut self, _key: &K) -> Result<(), Self::Error>
where
K: Serialize,
{
Err(Self::Error::custom("cannot perform partial serialization of lone keys, use `serialize_entry` instead if possible"))
}
fn serialize_value<V: ?Sized>(&mut self, _value: &V) -> Result<(), Self::Error>
where
V: Serialize,
{
Err(Self::Error::custom("cannot perform partial serialization of lone values, use `serialize_entry` instead if possible"))
}
fn end(self) -> Result<Self::Ok, Self::Error> {
self.sm.end()
}
fn serialize_entry<K: ?Sized, V: ?Sized>(
&mut self,
key: &K,
value: &V,
) -> Result<(), Self::Error>
where
K: Serialize,
V: Serialize,
{
let skip = key.serialize(KeySerializer::<'_, T, F, Self::Error> {
filter: self.filter,
_ty: PhantomData,
})?;
if skip {
Ok(())
} else {
self.sm.serialize_entry(key, value)
}
}
}
static KEY_ERR: &str = "key should serialize to a string";
impl<'a, T, F, E> Serializer for KeySerializer<'a, T, F, E>
where
T: ?Sized + for<'p> SerializePartial<'p>,
F: SerializeFilter<T>,
E: Error,
{
type Ok = bool;
type Error = E;
fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
Ok(self.filter.skip(Field::new(v)))
}
type SerializeSeq = Impossible<Self::Ok, Self::Error>;
type SerializeTuple = Impossible<Self::Ok, Self::Error>;
type SerializeTupleStruct = Impossible<Self::Ok, Self::Error>;
type SerializeTupleVariant = Impossible<Self::Ok, Self::Error>;
type SerializeMap = Impossible<Self::Ok, Self::Error>;
type SerializeStruct = Impossible<Self::Ok, Self::Error>;
type SerializeStructVariant = Impossible<Self::Ok, Self::Error>;
fn serialize_bool(self, _v: bool) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_i32(self, _v: i32) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_some<TT: ?Sized>(self, _value: &TT) -> Result<Self::Ok, Self::Error>
where
TT: Serialize,
{
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_unit_variant(
self,
_name: &'static str,
_index: u32,
_variant: &'static str,
) -> Result<Self::Ok, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_newtype_struct<TT: ?Sized>(
self,
_name: &'static str,
_value: &TT,
) -> Result<Self::Ok, Self::Error>
where
TT: Serialize,
{
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_newtype_variant<TT: ?Sized>(
self,
_name: &'static str,
_index: u32,
_variant: &'static str,
_value: &TT,
) -> Result<Self::Ok, Self::Error>
where
TT: Serialize,
{
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_tuple_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleStruct, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeStruct, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
fn serialize_struct_variant(
self,
_name: &'static str,
_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant, Self::Error> {
Err(Self::Error::custom(KEY_ERR))
}
}