dust/dust-lang/src/identifier.rs

use std::{
    fmt::{self, Display, Formatter},
    sync::Arc,
};

use serde::{de::Visitor, Deserialize, Serialize};

#[derive(Clone, Debug, Hash, Eq, PartialEq, PartialOrd, Ord)]
pub struct Identifier(Arc<String>);

impl Identifier {
    pub fn new<T: ToString>(string: T) -> Self {
        Identifier(Arc::new(string.to_string()))
    }

    pub fn as_str(&self) -> &str {
        self.0.as_str()
    }
}

impl Display for Identifier {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}

impl Serialize for Identifier {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        serializer.serialize_str(self.0.as_str())
    }
}

impl<'de> Deserialize<'de> for Identifier {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        Ok(Identifier(Arc::new(
            deserializer.deserialize_string(StringVisitor)?,
        )))
    }
}

struct StringVisitor;

impl<'de> Visitor<'de> for StringVisitor {
    type Value = String;

    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        formatter.write_str("a UTF-8 string")
    }
}