proof_of_sql/base/posql_time/
unit.rs

1use super::PoSQLTimestampError;
2use core::fmt;
3use serde::{Deserialize, Serialize};
4
5/// An intermediate type representing the time units from a parsed query
6#[derive(Debug, Clone, Copy, Hash, Serialize, Deserialize, PartialEq, Eq)]
7pub enum PoSQLTimeUnit {
8    /// Represents seconds with precision 0: ex "2024-06-20 12:34:56"
9    Second,
10    /// Represents milliseconds with precision 3: ex "2024-06-20 12:34:56.123"
11    Millisecond,
12    /// Represents microseconds with precision 6: ex "2024-06-20 12:34:56.123456"
13    Microsecond,
14    /// Represents nanoseconds with precision 9: ex "2024-06-20 12:34:56.123456789"
15    Nanosecond,
16}
17
18impl From<PoSQLTimeUnit> for u64 {
19    fn from(value: PoSQLTimeUnit) -> u64 {
20        match value {
21            PoSQLTimeUnit::Second => 0,
22            PoSQLTimeUnit::Millisecond => 3,
23            PoSQLTimeUnit::Microsecond => 6,
24            PoSQLTimeUnit::Nanosecond => 9,
25        }
26    }
27}
28
29impl TryFrom<&str> for PoSQLTimeUnit {
30    type Error = PoSQLTimestampError;
31    fn try_from(value: &str) -> Result<Self, PoSQLTimestampError> {
32        match value {
33            "0" => Ok(PoSQLTimeUnit::Second),
34            "3" => Ok(PoSQLTimeUnit::Millisecond),
35            "6" => Ok(PoSQLTimeUnit::Microsecond),
36            "9" => Ok(PoSQLTimeUnit::Nanosecond),
37            _ => Err(PoSQLTimestampError::UnsupportedPrecision {
38                error: value.into(),
39            }),
40        }
41    }
42}
43
44impl fmt::Display for PoSQLTimeUnit {
45    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
46        match self {
47            PoSQLTimeUnit::Second => write!(f, "seconds (precision: 0)"),
48            PoSQLTimeUnit::Millisecond => write!(f, "milliseconds (precision: 3)"),
49            PoSQLTimeUnit::Microsecond => write!(f, "microseconds (precision: 6)"),
50            PoSQLTimeUnit::Nanosecond => write!(f, "nanoseconds (precision: 9)"),
51        }
52    }
53}
54
55// expect(deprecated) for the sole purpose of testing that
56// timestamp precision is parsed correctly.
57#[cfg(test)]
58#[expect(clippy::missing_panics_doc)]
59mod time_unit_tests {
60    use super::*;
61    use crate::base::posql_time::PoSQLTimestampError;
62
63    #[test]
64    fn test_valid_precisions() {
65        assert_eq!(PoSQLTimeUnit::try_from("0"), Ok(PoSQLTimeUnit::Second));
66        assert_eq!(PoSQLTimeUnit::try_from("3"), Ok(PoSQLTimeUnit::Millisecond));
67        assert_eq!(PoSQLTimeUnit::try_from("6"), Ok(PoSQLTimeUnit::Microsecond));
68        assert_eq!(PoSQLTimeUnit::try_from("9"), Ok(PoSQLTimeUnit::Nanosecond));
69    }
70
71    #[test]
72    fn test_invalid_precision() {
73        let invalid_precisions = [
74            "1", "2", "4", "5", "7", "8", "10", "zero", "three", "cat", "-1", "-2",
75        ]; // Testing all your various invalid inputs
76        for &value in &invalid_precisions {
77            let result = PoSQLTimeUnit::try_from(value);
78            assert!(matches!(
79                result,
80                Err(PoSQLTimestampError::UnsupportedPrecision { .. })
81            ));
82        }
83    }
84}
proof_of_sql/base/posql_time/unit.rs

proof_of_sql/base/posql_time/
unit.rs
