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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| //! Contains new types for pretty-printing values found in DBN | ||
| //! records. | ||
| use std::fmt; | ||
|
|
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| use time::format_description::FormatItem; | ||
|
|
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| use crate::FIXED_PRICE_SCALE; | ||
|
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| /// A new type for formatting nanosecond UNIX timestamps. | ||
| #[derive(Clone, Copy, Default, PartialEq, Eq, PartialOrd, Ord)] | ||
| #[repr(transparent)] | ||
| pub struct Ts(pub u64); | ||
|
|
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| /// A new type for formatting nanosecond UNIX timestamps. | ||
| #[derive(Clone, Copy, Default, PartialEq, Eq, PartialOrd, Ord)] | ||
| #[repr(transparent)] | ||
| pub struct Px(pub i64); | ||
|
|
||
| impl From<u64> for Ts { | ||
| fn from(value: u64) -> Self { | ||
| Self(value) | ||
| } | ||
| } | ||
|
|
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| impl From<i64> for Px { | ||
| fn from(value: i64) -> Self { | ||
| Self(value) | ||
| } | ||
| } | ||
|
|
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| impl fmt::Debug for Ts { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| self.0.fmt(f) | ||
| } | ||
| } | ||
|
|
||
| impl fmt::Debug for Px { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| self.0.fmt(f) | ||
| } | ||
| } | ||
|
|
||
| impl fmt::Display for Ts { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| f.write_str(&fmt_ts(self.0)) | ||
| } | ||
| } | ||
|
|
||
| impl fmt::Display for Px { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| f.write_str(&fmt_px(self.0)) | ||
| } | ||
| } | ||
|
|
||
| /// Converts a fixed-precision price to a decimal string. | ||
| pub fn fmt_px(px: i64) -> String { | ||
| if px == crate::UNDEF_PRICE { | ||
| "UNDEF_PRICE".to_owned() | ||
| } else { | ||
| let (sign, px_abs) = if px < 0 { ("-", -px) } else { ("", px) }; | ||
| let px_integer = px_abs / FIXED_PRICE_SCALE; | ||
| let px_fraction = px_abs % FIXED_PRICE_SCALE; | ||
| format!("{sign}{px_integer}.{px_fraction:09}") | ||
| } | ||
| } | ||
|
|
||
| /// Converts a nanosecond UNIX timestamp to a human-readable string in the format | ||
| /// `[year]-[month]-[day]T[hour]:[minute]:[second].[subsecond digits:9]Z`. | ||
| pub fn fmt_ts(ts: u64) -> String { | ||
| const TS_FORMAT: &[FormatItem<'static>] = time::macros::format_description!( | ||
| "[year]-[month]-[day]T[hour]:[minute]:[second].[subsecond digits:9]Z" | ||
| ); | ||
| if ts == 0 { | ||
| String::new() | ||
| } else { | ||
| time::OffsetDateTime::from_unix_timestamp_nanos(ts as i128) | ||
| .map_err(|_| ()) | ||
| .and_then(|dt| dt.format(TS_FORMAT).map_err(|_| ())) | ||
| .unwrap_or_else(|_| ts.to_string()) | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use crate::UNDEF_PRICE; | ||
|
|
||
| use super::*; | ||
|
|
||
| #[test] | ||
| fn test_fmt_px_negative() { | ||
| assert_eq!(fmt_px(-100_000), "-0.000100000"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_fmt_px_positive() { | ||
| assert_eq!(fmt_px(32_500_000_000), "32.500000000"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_fmt_px_zero() { | ||
| assert_eq!(fmt_px(0), "0.000000000"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_fmt_px_undef() { | ||
| assert_eq!(fmt_px(UNDEF_PRICE), "UNDEF_PRICE"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_fmt_ts_0() { | ||
| assert!(fmt_ts(0).is_empty()); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_fmt_ts_1() { | ||
| assert_eq!(fmt_ts(1), "1970-01-01T00:00:00.000000001Z"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_fmt_ts_future() { | ||
| assert_eq!( | ||
| fmt_ts(1622838300000000000), | ||
| "2021-06-04T20:25:00.000000000Z" | ||
| ); | ||
| } | ||
| } |