use serde::{
de::{
Deserialize, Deserializer, Unexpected, {self},
},
Serialize, Serializer,
};
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
#[allow(clippy::exhaustive_structs)]
pub struct EmptyStateKey;
impl AsRef<str> for EmptyStateKey {
fn as_ref(&self) -> &str {
""
}
}
impl<'de> Deserialize<'de> for EmptyStateKey {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let s = ruma_common::serde::deserialize_cow_str(deserializer)?;
if s.is_empty() {
Ok(EmptyStateKey)
} else {
Err(de::Error::invalid_value(Unexpected::Str(&s), &"an empty string"))
}
}
}
impl Serialize for EmptyStateKey {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str("")
}
}