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use crate::ser::part::Sink;
use crate::ser::Error;
use serde::Serialize;
use std::borrow::Cow;
use std::ops::Deref;
pub enum Key<'key> {
Static(&'static str),
Dynamic(Cow<'key, str>),
}
impl<'key> Deref for Key<'key> {
type Target = str;
fn deref(&self) -> &str {
match *self {
Key::Static(key) => key,
Key::Dynamic(ref key) => key,
}
}
}
impl<'key> From<Key<'key>> for Cow<'static, str> {
fn from(key: Key<'key>) -> Self {
match key {
Key::Static(key) => key.into(),
Key::Dynamic(key) => key.into_owned().into(),
}
}
}
pub struct KeySink<End> {
end: End,
}
impl<End, Ok> KeySink<End>
where
End: for<'key> FnOnce(Key<'key>) -> Result<Ok, Error>,
{
pub fn new(end: End) -> Self {
KeySink { end }
}
}
impl<End, Ok> Sink for KeySink<End>
where
End: for<'key> FnOnce(Key<'key>) -> Result<Ok, Error>,
{
type Ok = Ok;
fn serialize_static_str(self, value: &'static str) -> Result<Ok, Error> {
(self.end)(Key::Static(value))
}
fn serialize_str(self, value: &str) -> Result<Ok, Error> {
(self.end)(Key::Dynamic(value.into()))
}
fn serialize_string(self, value: String) -> Result<Ok, Error> {
(self.end)(Key::Dynamic(value.into()))
}
fn serialize_none(self) -> Result<Ok, Error> {
Err(self.unsupported())
}
fn serialize_some<T: ?Sized + Serialize>(
self,
_value: &T,
) -> Result<Ok, Error> {
Err(self.unsupported())
}
fn unsupported(self) -> Error {
Error::Custom("unsupported key".into())
}
}