chrono_tz/
serde.rs

1extern crate serde;
2
3use self::serde::{de, Deserialize, Deserializer, Serialize, Serializer};
4use core::fmt;
5
6use crate::timezones::Tz;
7
8impl Serialize for Tz {
9    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
10        serializer.serialize_str(self.name())
11    }
12}
13
14impl<'de> Deserialize<'de> for Tz {
15    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
16        struct Visitor;
17
18        impl<'de> de::Visitor<'de> for Visitor {
19            type Value = Tz;
20
21            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
22                write!(formatter, "an IANA timezone string")
23            }
24
25            fn visit_str<E: de::Error>(self, value: &str) -> Result<Tz, E> {
26                value
27                    .parse::<Tz>()
28                    .map_err(|_| E::custom(SerdeError(value)))
29            }
30        }
31
32        deserializer.deserialize_str(Visitor)
33    }
34}
35
36struct SerdeError<'a>(&'a str);
37
38impl fmt::Display for SerdeError<'_> {
39    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
40        write!(f, "failed to parse timezone: '{}'", self.0)
41    }
42}
43
44#[cfg(test)]
45mod tests {
46    use crate::timezones::Tz::{self, Etc__UTC, Europe__London, UTC};
47    use serde_test::{assert_de_tokens_error, assert_tokens, Token};
48
49    #[test]
50    fn serde_ok_both_ways() {
51        assert_tokens(&Europe__London, &[Token::String("Europe/London")]);
52        assert_tokens(&Etc__UTC, &[Token::String("Etc/UTC")]);
53        assert_tokens(&UTC, &[Token::String("UTC")]);
54    }
55
56    #[test]
57    fn serde_de_error() {
58        assert_de_tokens_error::<Tz>(
59            &[Token::Str("Europe/L")],
60            "failed to parse timezone: 'Europe/L'",
61        );
62    }
63}
chrono_tz/serde.rs

chrono_tz/
serde.rs
