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//! Implementation of [`Distribution`] for various structs.
use rand::distributions::{Distribution, Standard};
use rand::Rng;
use crate::convert::*;
use crate::{Date, Duration, Month, OffsetDateTime, PrimitiveDateTime, Time, UtcOffset, Weekday};
impl Distribution<Time> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Time {
Time::__from_hms_nanos_unchecked(
rng.gen_range(0..Hour.per(Day)),
rng.gen_range(0..Minute.per(Hour)),
rng.gen_range(0..Second.per(Minute)),
rng.gen_range(0..Nanosecond.per(Second)),
)
}
}
impl Distribution<Date> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Date {
Date::from_julian_day_unchecked(
rng.gen_range(Date::MIN.to_julian_day()..=Date::MAX.to_julian_day()),
)
}
}
impl Distribution<UtcOffset> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> UtcOffset {
let seconds = rng.gen_range(-(Second.per(Day) as i32 - 1)..=(Second.per(Day) as i32 - 1));
UtcOffset::__from_hms_unchecked(
(seconds / Second.per(Hour) as i32) as _,
((seconds % Second.per(Hour) as i32) / Minute.per(Hour) as i32) as _,
(seconds % Second.per(Minute) as i32) as _,
)
}
}
impl Distribution<PrimitiveDateTime> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> PrimitiveDateTime {
PrimitiveDateTime::new(Self.sample(rng), Self.sample(rng))
}
}
impl Distribution<OffsetDateTime> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> OffsetDateTime {
let date_time: PrimitiveDateTime = Self.sample(rng);
date_time.assume_offset(Self.sample(rng))
}
}
impl Distribution<Duration> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Duration {
Duration::nanoseconds_i128(
rng.gen_range(Duration::MIN.whole_nanoseconds()..=Duration::MAX.whole_nanoseconds()),
)
}
}
impl Distribution<Weekday> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Weekday {
use Weekday::*;
match rng.gen_range(0u8..7) {
0 => Monday,
1 => Tuesday,
2 => Wednesday,
3 => Thursday,
4 => Friday,
5 => Saturday,
val => {
debug_assert!(val == 6);
Sunday
}
}
}
}
impl Distribution<Month> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Month {
use Month::*;
match rng.gen_range(1u8..=12) {
1 => January,
2 => February,
3 => March,
4 => April,
5 => May,
6 => June,
7 => July,
8 => August,
9 => September,
10 => October,
11 => November,
val => {
debug_assert!(val == 12);
December
}
}
}
}