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use chrono::{Datelike, Duration, NaiveDate, Weekday};
use serde::{Deserialize, Serialize};
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum Repetition {
Daily { period: u32 },
Monthly { day: DayOfMonth },
Yearly,
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum DayOfMonth {
Day { day: u8 },
Weekday { weekday: Weekday },
}
pub fn validate_period(str: &str) -> Result<u32, String> {
let n = str.parse::<u32>().map_err(|_| format!("{} n’est pas une période valide.", str))?;
if n == 0 {
Err("La periode doit être positive.".to_string())
} else {
Ok(n)
}
}
pub fn validate_day(str: &str) -> Result<u8, String> {
let n = str.parse::<u8>().map_err(|_| format!("« {} » n’est pas un jour valide.", str))?;
if (1..=31).contains(&n) {
Ok(n)
} else {
Err("Le jour devrait se situer entre le 1er et le 31 du mois.".to_string())
}
}
impl Repetition {
pub fn between(&self, event: NaiveDate, start: NaiveDate, end: NaiveDate) -> Vec<NaiveDate> {
let repeat = |mut date, next: Box<dyn Fn(NaiveDate) -> NaiveDate>| {
let mut repetitions = vec![];
while date <= end {
if date >= event && date >= start {
repetitions.push(date)
}
date = next(date)
}
repetitions
};
match self {
Repetition::Daily { period } => {
let n = start.signed_duration_since(event).num_days() % (*period as i64);
let duration = Duration::days(*period as i64);
repeat(start - Duration::days(n), Box::new(|d| d + duration))
}
Repetition::Monthly {
day: DayOfMonth::Day { day },
} => match start.with_day(*day as u32) {
Some(first_repetition) => repeat(first_repetition, Box::new(next_month)),
None => vec![],
},
Repetition::Monthly {
day: DayOfMonth::Weekday { weekday },
} => repeat(
first_weekday_of_month(start, *weekday),
Box::new(|d| first_weekday_of_month(next_month(d), *weekday)),
),
Repetition::Yearly => repeat(
NaiveDate::from_ymd(start.year(), event.month(), event.day()),
Box::new(|d| NaiveDate::from_ymd(d.year() + 1, d.month(), d.day())),
),
}
}
}
fn first_weekday_of_month(date: NaiveDate, weekday: Weekday) -> NaiveDate {
NaiveDate::from_weekday_of_month(date.year(), date.month(), weekday, 1)
}
fn next_month(date: NaiveDate) -> NaiveDate {
if date.month() == 12 {
NaiveDate::from_ymd(date.year() + 1, 1, date.day())
} else {
NaiveDate::from_ymd(date.year(), date.month() + 1, date.day())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn every_day_event_before() {
let repetition = Repetition::Daily { period: 1 };
assert_eq!(
repetition.between(d(2022, 6, 1), d(2022, 7, 1), d(2022, 8, 31)),
d(2022, 7, 1)
.iter_days()
.take(62)
.collect::<Vec<NaiveDate>>()
)
}
#[test]
fn every_day_event_between() {
let repetition = Repetition::Daily { period: 1 };
assert_eq!(
repetition.between(d(2022, 8, 10), d(2022, 7, 1), d(2022, 8, 31)),
d(2022, 8, 10)
.iter_days()
.take(22)
.collect::<Vec<NaiveDate>>()
)
}
#[test]
fn every_day_event_after() {
let repetition = Repetition::Daily { period: 1 };
assert!(repetition
.between(d(2022, 9, 1), d(2022, 7, 1), d(2022, 8, 31))
.is_empty())
}
#[test]
fn every_three_days() {
let repetition = Repetition::Daily { period: 3 };
assert_eq!(
repetition.between(d(2022, 2, 16), d(2022, 2, 21), d(2022, 3, 6)),
vec!(
d(2022, 2, 22),
d(2022, 2, 25),
d(2022, 2, 28),
d(2022, 3, 3),
d(2022, 3, 6)
)
)
}
#[test]
fn day_of_month() {
let repetition = Repetition::Monthly {
day: DayOfMonth::Day { day: 8 },
};
assert_eq!(
repetition.between(d(2022, 2, 7), d(2022, 1, 1), d(2022, 4, 7)),
vec!(d(2022, 2, 8), d(2022, 3, 8))
)
}
#[test]
fn weekday_of_month() {
let repetition = Repetition::Monthly {
day: DayOfMonth::Weekday {
weekday: Weekday::Tue,
},
};
assert_eq!(
repetition.between(d(2022, 1, 5), d(2022, 1, 1), d(2022, 4, 4)),
vec!(d(2022, 2, 1), d(2022, 3, 1))
)
}
#[test]
fn yearly() {
let repetition = Repetition::Yearly;
assert_eq!(
repetition.between(d(2020, 5, 5), d(2018, 1, 1), d(2022, 5, 5)),
vec!(d(2020, 5, 5), d(2021, 5, 5), d(2022, 5, 5))
)
}
fn d(y: i32, m: u32, d: u32) -> NaiveDate {
NaiveDate::from_ymd(y, m, d)
}
}
|
