41 lines
1.0 KiB
Rust
41 lines
1.0 KiB
Rust
use serde::{
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de::{
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Deserialize, Deserializer, Unexpected, {self},
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},
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Serialize, Serializer,
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};
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/// A type that can be used as the `state_key` for event types where that field is always empty.
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#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
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#[allow(clippy::exhaustive_structs)]
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pub struct EmptyStateKey;
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impl AsRef<str> for EmptyStateKey {
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fn as_ref(&self) -> &str {
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""
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}
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}
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impl<'de> Deserialize<'de> for EmptyStateKey {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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let s = ruma_common::serde::deserialize_cow_str(deserializer)?;
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if s.is_empty() {
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Ok(EmptyStateKey)
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} else {
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Err(de::Error::invalid_value(Unexpected::Str(&s), &"an empty string"))
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}
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}
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}
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impl Serialize for EmptyStateKey {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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serializer.serialize_str("")
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}
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}
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