108 lines
2.5 KiB
Rust
108 lines
2.5 KiB
Rust
//! Key used to identify a value or type.
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use std::{
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collections::HashSet,
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fmt::{self, Display, Formatter},
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hash::Hash,
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sync::{Arc, OnceLock, RwLock},
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};
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use serde::{de::Visitor, Deserialize, Serialize};
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static IDENTIFIER_CACHE: OnceLock<RwLock<HashSet<Identifier>>> = OnceLock::new();
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fn identifier_cache<'a>() -> &'a RwLock<HashSet<Identifier>> {
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IDENTIFIER_CACHE.get_or_init(|| RwLock::new(HashSet::new()))
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}
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/// Key used to identify a value or type.
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#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord, Hash)]
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pub struct Identifier(Arc<String>);
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impl Identifier {
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pub fn new<T: ToString>(text: T) -> Self {
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let cache = identifier_cache();
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let new = Identifier(Arc::new(text.to_string()));
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if let Some(identifier) = cache.read().unwrap().get(&new).cloned() {
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return identifier;
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}
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cache.write().unwrap().insert(new.clone());
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new
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}
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pub fn as_str(&self) -> &str {
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self.0.as_str()
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}
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}
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impl From<&str> for Identifier {
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fn from(text: &str) -> Self {
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Identifier::new(text)
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}
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}
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impl Display for Identifier {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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write!(f, "{}", self.0)
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}
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}
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impl Serialize for Identifier {
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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: serde::Serializer,
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{
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serializer.serialize_str(self.0.as_str())
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}
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}
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impl<'de> Deserialize<'de> for Identifier {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: serde::Deserializer<'de>,
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{
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deserializer.deserialize_identifier(IdentifierVisitor)
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}
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}
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struct IdentifierVisitor;
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impl<'de> Visitor<'de> for IdentifierVisitor {
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type Value = Identifier;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a UTF-8 string")
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}
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fn visit_char<E>(self, v: char) -> Result<Self::Value, E>
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where
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E: serde::de::Error,
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{
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self.visit_str(v.encode_utf8(&mut [0u8; 4]))
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}
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fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
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where
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E: serde::de::Error,
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{
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Ok(Identifier::new(v))
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}
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fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>
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where
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E: serde::de::Error,
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{
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self.visit_str(v)
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}
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fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
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where
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E: serde::de::Error,
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{
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self.visit_str(&v)
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}
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}
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