extern crate serde;
use self::serde::{de, Deserialize, Deserializer, Serialize, Serializer};
use core::fmt;
use crate::timezones::Tz;
impl Serialize for Tz {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
serializer.serialize_str(self.name())
}
}
impl<'de> Deserialize<'de> for Tz {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
struct Visitor;
impl<'de> de::Visitor<'de> for Visitor {
type Value = Tz;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "an IANA timezone string")
}
fn visit_str<E: de::Error>(self, value: &str) -> Result<Tz, E> {
value
.parse::<Tz>()
.map_err(|_| E::custom(SerdeError(value)))
}
}
deserializer.deserialize_str(Visitor)
}
}
struct SerdeError<'a>(&'a str);
impl fmt::Display for SerdeError<'_> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "failed to parse timezone: '{}'", self.0)
}
}
#[cfg(test)]
mod tests {
use crate::timezones::Tz::{self, Etc__UTC, Europe__London, UTC};
use serde_test::{assert_de_tokens_error, assert_tokens, Token};
#[test]
fn serde_ok_both_ways() {
assert_tokens(&Europe__London, &[Token::String("Europe/London")]);
assert_tokens(&Etc__UTC, &[Token::String("Etc/UTC")]);
assert_tokens(&UTC, &[Token::String("UTC")]);
}
#[test]
fn serde_de_error() {
assert_de_tokens_error::<Tz>(
&[Token::Str("Europe/L")],
"failed to parse timezone: 'Europe/L'",
);
}
}