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use std::fmt;
use std::str::FromStr;
use chrono::Duration;
use date::Date;
use event::{Event, End};
use errors::EventError;
#[derive(Debug)]
pub struct Periodic {
pub event: Event,
pub freq: Freq,
pub interval: i64,
pub count: Option<i64>,
pub until: Option<Date>,
}
#[derive(Debug)]
pub enum Freq {
Secondly,
Minutely,
Hourly,
Daily,
Weekly,
Monthly,
Yearly,
}
impl Periodic {
pub fn new() -> Self {
Self {
event: Event::new(),
freq: Freq::Secondly,
interval: 1,
count: None,
until: None,
}
}
pub fn set_param(&mut self, param: &str, value: &str) -> Result<(), EventError> {
match param {
"FREQ" => self.freq = value.parse()?,
"INTERVAL" => self.interval = value.parse()?,
"COUNT" => self.count = Some(value.parse()?),
"UNTIL" => self.until = Some(Date::parse(&value, "")?),
_ => (),
}
Ok(())
}
pub fn iter<'a>(&'a self) -> Iter<'a> {
Iter {
periodic: self,
start: self.event.start,
end: self.event.end_date(),
count: 0,
}
}
}
pub struct Iter<'a> {
periodic: &'a Periodic,
start: Date,
end: Date,
count: i64,
}
impl<'a> Iterator for Iter<'a> {
type Item = Event;
fn next(&mut self) -> Option<Self::Item> {
let p = self.periodic;
if (p.until.is_some() && self.start <= p.until.unwrap()) ||
(p.count.is_some() && self.count >= p.count.unwrap())
{
return None;
}
let mut event = p.event.clone();
event.start = self.start;
event.end = End::Date(self.end);
self.count += 1;
self.start = p.freq.next_date(self.start, p.interval);
self.end = p.freq.next_date(self.end, p.interval);
Some(event)
}
}
impl fmt::Display for Periodic {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self.freq)?;
if self.interval != 1 {
write!(f, "({})", self.interval)?;
}
write!(f, ": {}", self.event)?;
Ok(())
}
}
impl Freq {
pub fn next_date(&self, date: Date, count: i64) -> Date {
match self {
Freq::Secondly => date + Duration::seconds(count),
Freq::Minutely => date + Duration::minutes(count),
Freq::Hourly => date + Duration::hours(count),
Freq::Daily => date + Duration::days(count),
Freq::Weekly => date + Duration::weeks(count),
Freq::Monthly => {
let month = date.month();
if month == 12 {
let date = date.with_month(1).unwrap();
date.with_year(date.year() + 1).unwrap()
} else {
date.with_month(month + 1).unwrap()
}
}
Freq::Yearly => date.with_year(date.year() + 1).unwrap(),
}
}
}
impl FromStr for Freq {
type Err = EventError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"SECONDLY" => Ok(Freq::Secondly),
"MINUTELY" => Ok(Freq::Minutely),
"HOURLY" => Ok(Freq::Hourly),
"DAILY" => Ok(Freq::Daily),
"WEEKLY" => Ok(Freq::Weekly),
"MONTHLY" => Ok(Freq::Monthly),
"YEARLY" => Ok(Freq::Yearly),
_ => Err(EventError::FreqError),
}
}
}
|
