Add pyo3 integration

Some parts taken from https://github.com/kangalioo/pyo3-chrono

CHANGELOG.md

@@ -22,6 +22,7 @@ Versions with only mechanical changes will be omitted from the following list.
 * Change `Local::now()` and `Utc::now()` documentation from "current date" to "current date and time" (#647)
 * Fix `duration_round` panic on rounding by `Duration::zero()` (#658)
 * Add optional rkyv support.
+* Add `pyo3` integration (@pickfire @kangalioo #542)
 
 ## 0.4.19
 

Cargo.toml

@@ -40,6 +40,7 @@ serde = { version = "1.0.99", default-features = false, optional = true }
 pure-rust-locales = { version = "0.5.2", optional = true }
 criterion = { version = "0.3", optional = true }
 rkyv = {version = "0.7", optional = true}
+pyo3 = { version = "0.16.2", optional = true }
 
 [target.'cfg(all(target_arch = "wasm32", not(any(target_os = "emscripten", target_os = "wasi"))))'.dependencies]
 wasm-bindgen = { version = "0.2", optional = true }
@@ -54,6 +55,7 @@ serde_derive = { version = "1", default-features = false }
 bincode = { version = "0.8.0" }
 num-iter = { version = "0.1.35", default-features = false }
 doc-comment = { version = "0.3" }
+pyo3 = { version = "0.16.2", features = ["auto-initialize"] }
 
 [target.'cfg(all(target_arch = "wasm32", not(any(target_os = "emscripten", target_os = "wasi"))))'.dev-dependencies]
 wasm-bindgen-test = "0.3"

Makefile

@@ -26,4 +26,4 @@ test:
 
 .PHONY: doc
 doc: authors readme
-	cargo doc --features 'serde rustc-serialize bincode'
+	cargo doc --features 'serde rustc-serialize bincode pyo3'

README.md

@@ -62,11 +62,13 @@ Optional features:
 
 - `wasmbind`: Enable integration with [wasm-bindgen][] and its `js-sys` project
 - [`serde`][]: Enable serialization/deserialization via serde.
+- [`pyo3`][]: Enable integration with pyo3.
 - `unstable-locales`: Enable localization. This adds various methods with a
   `_localized` suffix. The implementation and API may change or even be
   removed in a patch release. Feedback welcome.
 
 [`serde`]: https://github.com/serde-rs/serde
+[`pyo3`]: https://github.com/PyO3/pyo3
 [wasm-bindgen]: https://github.com/rustwasm/wasm-bindgen
 
 See the [cargo docs][] for examples of specifying features.

ci/github.sh

@@ -6,7 +6,7 @@ set -euo pipefail
 source "${BASH_SOURCE[0]%/*}/_shlib.sh"
 
 TEST_TZS=(ACST-9:30 EST4 UTC0 Asia/Katmandu)
-FEATURES=(std serde clock "alloc serde" unstable-locales)
+FEATURES=(std serde clock "alloc serde" unstable-locales pyo3)
 CHECK_FEATURES=(alloc "std unstable-locales" "serde clock" "clock unstable-locales")
 RUST_132_FEATURES=(rustc-serialize serde)
 

src/datetime/mod.rs

@@ -80,7 +80,7 @@ pub enum SecondsFormat {
 /// [`TimeZone`](./offset/trait.TimeZone.html) implementations.
 #[derive(Clone)]
 pub struct DateTime<Tz: TimeZone> {
-    datetime: NaiveDateTime,
+    pub(crate) datetime: NaiveDateTime,
     offset: Tz::Offset,
 }
 

src/lib.rs

@@ -49,11 +49,13 @@
 //!
 //! - `wasmbind`: Enable integration with [wasm-bindgen][] and its `js-sys` project
 //! - [`serde`][]: Enable serialization/deserialization via serde.
+//! - [`pyo3`][]: Enable integration with pyo3.
 //! - `unstable-locales`: Enable localization. This adds various methods with a
 //!   `_localized` suffix. The implementation and API may change or even be
 //!   removed in a patch release. Feedback welcome.
 //!
 //! [`serde`]: https://github.com/serde-rs/serde
+//! [`pyo3`]: https://github.com/PyO3/pyo3
 //! [wasm-bindgen]: https://github.com/rustwasm/wasm-bindgen
 //!
 //! See the [cargo docs][] for examples of specifying features.
@@ -534,3 +536,6 @@ pub use naive::__BenchYearFlags;
 pub mod serde {
     pub use super::datetime::serde::*;
 }
+
+#[cfg(feature = "pyo3")]
+mod pyo3;

src/naive/date.rs

@@ -173,7 +173,7 @@ impl NaiveDate {
     /// assert_eq!(d.weekday(), Weekday::Sat);
     /// assert_eq!(d.num_days_from_ce(), 735671); // days since January 1, 1 CE
     /// ```
-    pub fn from_ymd(year: i32, month: u32, day: u32) -> NaiveDate {
+    pub(crate) fn from_ymd(year: i32, month: u32, day: u32) -> NaiveDate {
         NaiveDate::from_ymd_opt(year, month, day).expect("invalid or out-of-range date")
     }
 
@@ -766,7 +766,7 @@ impl NaiveDate {
 
     /// Returns the packed month-day-flags.
     #[inline]
-    fn mdf(&self) -> Mdf {
+    pub(crate) fn mdf(&self) -> Mdf {
         self.of().to_mdf()
     }
 
@@ -1899,7 +1899,6 @@ mod serde {
         assert_eq!(d, decoded);
     }
 }
-
 #[cfg(test)]
 mod tests {
     use super::NaiveDate;

src/naive/internals.rs

@@ -371,7 +371,7 @@ impl fmt::Debug for Of {
 /// (month, day of month and leap flag),
 /// which is an index to the `MDL_TO_OL` lookup table.
 #[derive(PartialEq, PartialOrd, Copy, Clone)]
-pub(super) struct Mdf(pub(super) u32);
+pub(crate) struct Mdf(pub(super) u32);
 
 impl Mdf {
     #[inline]
@@ -419,7 +419,7 @@ impl Mdf {
     }
 
     #[inline]
-    pub(super) fn month(&self) -> u32 {
+    pub(crate) fn month(&self) -> u32 {
         let Mdf(mdf) = *self;
         mdf >> 9
     }
@@ -432,7 +432,7 @@ impl Mdf {
     }
 
     #[inline]
-    pub(super) fn day(&self) -> u32 {
+    pub(crate) fn day(&self) -> u32 {
         let Mdf(mdf) = *self;
         (mdf >> 4) & 0b1_1111
     }

src/naive/time/mod.rs

@@ -807,7 +807,7 @@ impl NaiveTime {
     }
 
     /// Returns a triple of the hour, minute and second numbers.
-    fn hms(&self) -> (u32, u32, u32) {
+    pub(crate) fn hms(&self) -> (u32, u32, u32) {
         let (mins, sec) = div_mod_floor(self.secs, 60);
         let (hour, min) = div_mod_floor(mins, 60);
         (hour, min, sec)

src/oldtime.rs

@@ -457,6 +457,97 @@ fn div_rem_64(this: i64, other: i64) -> (i64, i64) {
     (this / other, this % other)
 }
 
+#[cfg(feature = "pyo3")]
+mod pyo3 {
+    use super::{div_mod_floor_64, NANOS_PER_MICRO, SECS_PER_DAY};
+    use crate::Duration;
+    use pyo3::conversion::{FromPyObject, IntoPy, PyTryFrom, ToPyObject};
+    use pyo3::types::{PyDelta, PyDeltaAccess};
+    use std::convert::TryInto;
+
+    impl ToPyObject for Duration {
+        fn to_object(&self, py: pyo3::Python) -> pyo3::PyObject {
+            let micros = self.nanos / NANOS_PER_MICRO;
+            let (days, secs) = div_mod_floor_64(self.secs, SECS_PER_DAY);
+            // Python will check overflow so even if we reduce the size
+            // it will still overflow.
+            let days = days.try_into().unwrap_or(i32::MAX);
+            let secs = secs.try_into().unwrap_or(i32::MAX);
+
+            // We do not need to check i64 to i32 cast from rust because
+            // python will panic with OverflowError.
+            // Not sure if we need normalize here.
+            let delta =
+                PyDelta::new(py, days, secs, micros, false).expect("Failed to construct delta");
+            delta.into()
+        }
+    }
+
+    impl IntoPy<pyo3::PyObject> for Duration {
+        fn into_py(self, py: pyo3::Python) -> pyo3::PyObject {
+            ToPyObject::to_object(&self, py)
+        }
+    }
+
+    impl FromPyObject<'_> for Duration {
+        fn extract(ob: &pyo3::PyAny) -> pyo3::PyResult<Duration> {
+            let delta = <PyDelta as PyTryFrom>::try_from(ob)?;
+            // Python size are much lower than rust size so we do not need bound checks.
+            // 0 <= microseconds < 1000000
+            // 0 <= seconds < 3600*24
+            // -999999999 <= days <= 999999999
+            let secs = delta.get_days() as i64 * SECS_PER_DAY + delta.get_seconds() as i64;
+            let nanos = delta.get_microseconds() * NANOS_PER_MICRO;
+
+            Ok(Duration { secs, nanos })
+        }
+    }
+
+    #[test]
+    fn test_pyo3_topyobject() {
+        use std::cmp::Ordering;
+        use std::panic;
+
+        let gil = pyo3::Python::acquire_gil();
+        let py = gil.python();
+        let check = |s, ns, py_d, py_s, py_ms| {
+            let delta = Duration { secs: s, nanos: ns }.to_object(py);
+            let delta: &PyDelta = delta.extract(py).unwrap();
+            let py_delta = PyDelta::new(py, py_d, py_s, py_ms, true).unwrap();
+            assert_eq!(delta.compare(py_delta).unwrap(), Ordering::Equal);
+        };
+        let check_panic = |duration: Duration| {
+            assert!(panic::catch_unwind(|| {
+                let gil = pyo3::Python::acquire_gil();
+                let py = gil.python();
+                duration.to_object(py);
+            })
+            .is_err())
+        };
+
+        check(-86399999913600, 0, -999999999, 0, 0); // min
+        check(86399999999999, 999999000, 999999999, 86399, 999999); // max
+
+        check_panic(super::MIN);
+        check_panic(super::MAX);
+    }
+
+    #[test]
+    fn test_pyo3_frompyobject() {
+        let gil = pyo3::Python::acquire_gil();
+        let py = gil.python();
+        let check = |s, ns, py_d, py_s, py_ms| {
+            let py_delta = PyDelta::new(py, py_d, py_s, py_ms, false).unwrap();
+            let py_delta: Duration = py_delta.extract().unwrap();
+            let delta = Duration { secs: s, nanos: ns };
+            assert_eq!(py_delta, delta);
+        };
+
+        check(-86399999913600, 0, -999999999, 0, 0); // min
+        check(86399999999999, 999999000, 999999999, 86399, 999999); // max
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::{Duration, OutOfRangeError, MAX, MIN};

src/pyo3/date.rs

@@ -0,0 +1,61 @@
+use crate::{Datelike, NaiveDate};
+use pyo3::conversion::{FromPyObject, IntoPy, PyTryFrom, ToPyObject};
+use pyo3::types::{PyDate, PyDateAccess};
+
+impl ToPyObject for NaiveDate {
+    fn to_object(&self, py: pyo3::Python) -> pyo3::PyObject {
+        let mdf = self.mdf();
+        let date = PyDate::new(py, self.year(), mdf.month() as u8, mdf.day() as u8)
+            .expect("Failed to construct date");
+        date.into()
+    }
+}
+
+impl IntoPy<pyo3::PyObject> for NaiveDate {
+    fn into_py(self, py: pyo3::Python) -> pyo3::PyObject {
+        ToPyObject::to_object(&self, py)
+    }
+}
+
+impl FromPyObject<'_> for NaiveDate {
+    fn extract(ob: &pyo3::PyAny) -> pyo3::PyResult<NaiveDate> {
+        let date = <PyDate as PyTryFrom>::try_from(ob)?;
+        Ok(NaiveDate::from_ymd(date.get_year(), date.get_month() as u32, date.get_day() as u32))
+    }
+}
+
+#[test]
+fn test_pyo3_topyobject() {
+    use std::cmp::Ordering;
+
+    let gil = pyo3::Python::acquire_gil();
+    let py = gil.python();
+    let eq_ymd = |y, m, d| {
+        let date = NaiveDate::from_ymd(y, m, d).to_object(py);
+        let date: &PyDate = date.extract(py).unwrap();
+        let py_date = PyDate::new(py, y, m as u8, d as u8).unwrap();
+        assert_eq!(date.compare(py_date).unwrap(), Ordering::Equal);
+    };
+
+    eq_ymd(2012, 2, 29);
+    eq_ymd(1, 1, 1); // min
+    eq_ymd(3000, 6, 5); // future
+    eq_ymd(9999, 12, 31); // max
+}
+
+#[test]
+fn test_pyo3_frompyobject() {
+    let gil = pyo3::Python::acquire_gil();
+    let py = gil.python();
+    let eq_ymd = |y, m, d| {
+        let py_date = PyDate::new(py, y, m as u8, d as u8).unwrap();
+        let py_date: NaiveDate = py_date.extract().unwrap();
+        let date = NaiveDate::from_ymd(y, m, d);
+        assert_eq!(py_date, date);
+    };
+
+    eq_ymd(2012, 2, 29);
+    eq_ymd(1, 1, 1); // min
+    eq_ymd(3000, 6, 5); // future
+    eq_ymd(9999, 12, 31); // max
+}