chrono/naive/time/
serde.rs

1use super::NaiveTime;
2use core::fmt;
3use serde::{de, ser};
4
5// TODO not very optimized for space (binary formats would want something better)
6// TODO round-trip for general leap seconds (not just those with second = 60)
7
8impl ser::Serialize for NaiveTime {
9    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
10    where
11        S: ser::Serializer,
12    {
13        serializer.collect_str(&self)
14    }
15}
16
17struct NaiveTimeVisitor;
18
19impl<'de> de::Visitor<'de> for NaiveTimeVisitor {
20    type Value = NaiveTime;
21
22    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
23        formatter.write_str("a formatted time string")
24    }
25
26    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
27    where
28        E: de::Error,
29    {
30        value.parse().map_err(E::custom)
31    }
32}
33
34impl<'de> de::Deserialize<'de> for NaiveTime {
35    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
36    where
37        D: de::Deserializer<'de>,
38    {
39        deserializer.deserialize_str(NaiveTimeVisitor)
40    }
41}
42
43#[cfg(test)]
44mod tests {
45    use crate::NaiveTime;
46
47    #[test]
48    fn test_serde_serialize() {
49        assert_eq!(
50            serde_json::to_string(&NaiveTime::from_hms_opt(0, 0, 0).unwrap()).ok(),
51            Some(r#""00:00:00""#.into())
52        );
53        assert_eq!(
54            serde_json::to_string(&NaiveTime::from_hms_milli_opt(0, 0, 0, 950).unwrap()).ok(),
55            Some(r#""00:00:00.950""#.into())
56        );
57        assert_eq!(
58            serde_json::to_string(&NaiveTime::from_hms_milli_opt(0, 0, 59, 1_000).unwrap()).ok(),
59            Some(r#""00:00:60""#.into())
60        );
61        assert_eq!(
62            serde_json::to_string(&NaiveTime::from_hms_opt(0, 1, 2).unwrap()).ok(),
63            Some(r#""00:01:02""#.into())
64        );
65        assert_eq!(
66            serde_json::to_string(&NaiveTime::from_hms_nano_opt(3, 5, 7, 98765432).unwrap()).ok(),
67            Some(r#""03:05:07.098765432""#.into())
68        );
69        assert_eq!(
70            serde_json::to_string(&NaiveTime::from_hms_opt(7, 8, 9).unwrap()).ok(),
71            Some(r#""07:08:09""#.into())
72        );
73        assert_eq!(
74            serde_json::to_string(&NaiveTime::from_hms_micro_opt(12, 34, 56, 789).unwrap()).ok(),
75            Some(r#""12:34:56.000789""#.into())
76        );
77        let leap = NaiveTime::from_hms_nano_opt(23, 59, 59, 1_999_999_999).unwrap();
78        assert_eq!(serde_json::to_string(&leap).ok(), Some(r#""23:59:60.999999999""#.into()));
79    }
80
81    #[test]
82    fn test_serde_deserialize() {
83        let from_str = serde_json::from_str::<NaiveTime>;
84
85        assert_eq!(from_str(r#""00:00:00""#).ok(), Some(NaiveTime::from_hms_opt(0, 0, 0).unwrap()));
86        assert_eq!(from_str(r#""0:0:0""#).ok(), Some(NaiveTime::from_hms_opt(0, 0, 0).unwrap()));
87        assert_eq!(
88            from_str(r#""00:00:00.950""#).ok(),
89            Some(NaiveTime::from_hms_milli_opt(0, 0, 0, 950).unwrap())
90        );
91        assert_eq!(
92            from_str(r#""0:0:0.95""#).ok(),
93            Some(NaiveTime::from_hms_milli_opt(0, 0, 0, 950).unwrap())
94        );
95        assert_eq!(
96            from_str(r#""00:00:60""#).ok(),
97            Some(NaiveTime::from_hms_milli_opt(0, 0, 59, 1_000).unwrap())
98        );
99        assert_eq!(from_str(r#""00:01:02""#).ok(), Some(NaiveTime::from_hms_opt(0, 1, 2).unwrap()));
100        assert_eq!(
101            from_str(r#""03:05:07.098765432""#).ok(),
102            Some(NaiveTime::from_hms_nano_opt(3, 5, 7, 98765432).unwrap())
103        );
104        assert_eq!(from_str(r#""07:08:09""#).ok(), Some(NaiveTime::from_hms_opt(7, 8, 9).unwrap()));
105        assert_eq!(
106            from_str(r#""12:34:56.000789""#).ok(),
107            Some(NaiveTime::from_hms_micro_opt(12, 34, 56, 789).unwrap())
108        );
109        assert_eq!(
110            from_str(r#""23:59:60.999999999""#).ok(),
111            Some(NaiveTime::from_hms_nano_opt(23, 59, 59, 1_999_999_999).unwrap())
112        );
113        assert_eq!(
114            from_str(r#""23:59:60.9999999999997""#).ok(), // excess digits are ignored
115            Some(NaiveTime::from_hms_nano_opt(23, 59, 59, 1_999_999_999).unwrap())
116        );
117
118        // bad formats
119        assert!(from_str(r#""""#).is_err());
120        assert!(from_str(r#""000000""#).is_err());
121        assert!(from_str(r#""00:00:61""#).is_err());
122        assert!(from_str(r#""00:60:00""#).is_err());
123        assert!(from_str(r#""24:00:00""#).is_err());
124        assert!(from_str(r#""23:59:59,1""#).is_err());
125        assert!(from_str(r#""012:34:56""#).is_err());
126        assert!(from_str(r#""hh:mm:ss""#).is_err());
127        assert!(from_str(r#"0"#).is_err());
128        assert!(from_str(r#"86399"#).is_err());
129        assert!(from_str(r#"{}"#).is_err());
130    }
131
132    #[test]
133    fn test_serde_bincode() {
134        // Bincode is relevant to test separately from JSON because
135        // it is not self-describing.
136        use bincode::{deserialize, serialize};
137
138        let t = NaiveTime::from_hms_nano_opt(3, 5, 7, 98765432).unwrap();
139        let encoded = serialize(&t).unwrap();
140        let decoded: NaiveTime = deserialize(&encoded).unwrap();
141        assert_eq!(t, decoded);
142    }
143}
chrono/naive/time/serde.rs

chrono/naive/time/
serde.rs
