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use crate::iso::{Iso, IsoDateInner, IsoDay, IsoMonth, IsoYear};
use crate::{types, Calendar, Date, DateDuration, DateDurationUnit, DateTime, DateTimeError};
use core::convert::TryInto;
use tinystr::tinystr16;
#[derive(Copy, Clone, Debug, Default)]
pub struct Gregorian;
#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq)]
pub struct GregorianDateInner(IsoDateInner);
impl Calendar for Gregorian {
type DateInner = GregorianDateInner;
fn date_from_iso(&self, iso: Date<Iso>) -> GregorianDateInner {
GregorianDateInner(*iso.inner())
}
fn date_to_iso(&self, date: &Self::DateInner) -> Date<Iso> {
Date::from_raw(date.0, Iso)
}
fn months_in_year(&self, date: &Self::DateInner) -> u8 {
Iso.months_in_year(&date.0)
}
fn days_in_year(&self, date: &Self::DateInner) -> u32 {
Iso.days_in_year(&date.0)
}
fn days_in_month(&self, date: &Self::DateInner) -> u8 {
Iso.days_in_month(&date.0)
}
fn offset_date(&self, date: &mut Self::DateInner, offset: DateDuration<Self>) {
Iso.offset_date(&mut date.0, offset.cast_unit())
}
#[allow(clippy::field_reassign_with_default)]
fn until(
&self,
date1: &Self::DateInner,
date2: &Self::DateInner,
largest_unit: DateDurationUnit,
smallest_unit: DateDurationUnit,
) -> DateDuration<Self> {
Iso.until(&date1.0, &date2.0, largest_unit, smallest_unit)
.cast_unit()
}
fn year(&self, date: &Self::DateInner) -> types::Year {
iso_year_as_gregorian(date.0.year)
}
fn month(&self, date: &Self::DateInner) -> types::Month {
Iso.month(&date.0)
}
fn day_of_month(&self, date: &Self::DateInner) -> types::DayOfMonth {
Iso.day_of_month(&date.0)
}
fn day_of_year_info(&self, date: &Self::DateInner) -> types::DayOfYearInfo {
let prev_year = IsoYear(date.0.year.0 - 1);
let next_year = IsoYear(date.0.year.0 + 1);
types::DayOfYearInfo {
day_of_year: Iso::day_of_year(date.0),
days_in_year: Iso::days_in_year(date.0.year),
prev_year: iso_year_as_gregorian(prev_year),
days_in_prev_year: Iso::days_in_year(prev_year),
next_year: iso_year_as_gregorian(next_year),
}
}
fn debug_name() -> &'static str {
"Gregorian"
}
}
impl Date<Gregorian> {
pub fn new_gregorian_date(
year: IsoYear,
month: IsoMonth,
day: IsoDay,
) -> Result<Date<Gregorian>, DateTimeError> {
Date::new_iso_date(year, month, day).map(|d| Date::new_from_iso(d, Gregorian))
}
}
impl DateTime<Gregorian> {
pub fn new_gregorian_datetime_from_integers(
year: i32,
month: u8,
day: u8,
hour: u8,
minute: u8,
second: u8,
) -> Result<DateTime<Gregorian>, DateTimeError> {
Ok(DateTime {
date: Date::new_gregorian_date(year.into(), month.try_into()?, day.try_into()?)?,
time: types::Time::try_new(hour, minute, second)?,
})
}
}
fn iso_year_as_gregorian(year: IsoYear) -> types::Year {
if year.0 > 0 {
types::Year {
era: types::Era(tinystr16!("ad")),
number: year.0,
related_iso: year.0,
}
} else {
types::Year {
era: types::Era(tinystr16!("bc")),
number: 1 - year.0,
related_iso: year.0,
}
}
}