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use crate::{SmartString, SmartStringMode};
use alloc::string::String;
use core::{fmt, marker::PhantomData};
use serde::{
de::{Error, Visitor},
Deserialize, Deserializer, Serialize, Serializer,
};
impl<T: SmartStringMode> Serialize for SmartString<T> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(self)
}
}
impl<'de, T: SmartStringMode> Deserialize<'de> for SmartString<T> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer
.deserialize_string(SmartStringVisitor(PhantomData))
.map(SmartString::from)
}
}
struct SmartStringVisitor<T: SmartStringMode>(PhantomData<*const T>);
impl<'de, T: SmartStringMode> Visitor<'de> for SmartStringVisitor<T> {
type Value = SmartString<T>;
fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
formatter.write_str("a string")
}
fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
where
E: Error,
{
Ok(SmartString::from(v))
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: Error,
{
Ok(SmartString::from(v))
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::Compact;
#[test]
fn test_ser_de() {
use serde_test::{assert_tokens, Token};
let strings = [
"",
"small test",
"longer than inline string for serde testing",
];
for &string in strings.iter() {
let value = SmartString::<Compact>::from(string);
assert_tokens(&value, &[Token::String(string)]);
}
}
}