summaryrefslogtreecommitdiffstats
path: root/third_party/rust/slab/src/serde.rs
diff options
context:
space:
mode:
Diffstat (limited to 'third_party/rust/slab/src/serde.rs')
-rw-r--r--third_party/rust/slab/src/serde.rs62
1 files changed, 62 insertions, 0 deletions
diff --git a/third_party/rust/slab/src/serde.rs b/third_party/rust/slab/src/serde.rs
new file mode 100644
index 0000000000..894d59c119
--- /dev/null
+++ b/third_party/rust/slab/src/serde.rs
@@ -0,0 +1,62 @@
+use core::fmt;
+use core::marker::PhantomData;
+
+use serde::de::{Deserialize, Deserializer, MapAccess, Visitor};
+use serde::ser::{Serialize, SerializeMap, Serializer};
+
+use super::{builder::Builder, Slab};
+
+impl<T> Serialize for Slab<T>
+where
+ T: Serialize,
+{
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where
+ S: Serializer,
+ {
+ let mut map_serializer = serializer.serialize_map(Some(self.len()))?;
+ for (key, value) in self {
+ map_serializer.serialize_key(&key)?;
+ map_serializer.serialize_value(value)?;
+ }
+ map_serializer.end()
+ }
+}
+
+struct SlabVisitor<T>(PhantomData<T>);
+
+impl<'de, T> Visitor<'de> for SlabVisitor<T>
+where
+ T: Deserialize<'de>,
+{
+ type Value = Slab<T>;
+
+ fn expecting(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(fmt, "a map")
+ }
+
+ fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+ where
+ A: MapAccess<'de>,
+ {
+ let mut builder = Builder::with_capacity(map.size_hint().unwrap_or(0));
+
+ while let Some((key, value)) = map.next_entry()? {
+ builder.pair(key, value)
+ }
+
+ Ok(builder.build())
+ }
+}
+
+impl<'de, T> Deserialize<'de> for Slab<T>
+where
+ T: Deserialize<'de>,
+{
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+ where
+ D: Deserializer<'de>,
+ {
+ deserializer.deserialize_map(SlabVisitor(PhantomData))
+ }
+}