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use crate::iter::{
build_poslist, increment_counter_date, make_timeset, remove_filtered_days, IterInfo,
};
use crate::{datetime::from_ordinal, RRule};
use crate::{datetime::Time, Frequenzy};
use chrono::{prelude::*, Duration};
use chrono_tz::{Tz, UTC};
use std::collections::VecDeque;
const MAX_YEAR: i32 = 9999;
pub struct RRuleIter<'a> {
pub counter_date: DateTime<Tz>,
pub ii: IterInfo<'a>,
pub timeset: Vec<Time>,
// Buffer of datetimes not yet yielded
pub buffer: VecDeque<DateTime<Tz>>,
pub finished: bool,
pub count: Option<u32>,
}
impl<'a> RRuleIter<'a> {
pub fn generate(&mut self) -> bool {
let options = self.ii.options;
if options.interval == 0 {
return true;
}
match self.count {
Some(count) if count == 0 => return true,
_ => (),
};
if self.counter_date.year() > MAX_YEAR {
return true;
}
while self.buffer.is_empty() {
let (dayset, start, end) = self.ii.getdayset(
&self.ii.options.freq,
self.counter_date.year() as isize,
self.counter_date.month() as usize,
self.counter_date.day() as usize,
);
let mut dayset = dayset
.into_iter()
.map(|s| Some(s as isize))
.collect::<Vec<Option<isize>>>();
let filtered = remove_filtered_days(&mut dayset, start, end, &self.ii);
if options.bysetpos.len() > 0 {
let poslist = build_poslist(
&options.bysetpos,
&self.timeset,
start,
end,
&self.ii,
&dayset,
&options.tzid,
);
for j in 0..poslist.len() {
let res = poslist[j];
if options.until.is_some() && res > options.until.unwrap() {
continue; // or break ?
}
if res >= options.dtstart {
self.buffer.push_back(res);
if let Some(count) = self.count {
if count > 0 {
self.count = Some(count - 1);
// self.ii.options.count = Some(count - 1);
}
// This means that the real count is 0, because of the decrement above
if count == 1 {
return true;
}
}
}
}
} else {
for j in start..end {
let current_day = dayset[j];
if current_day.is_none() {
continue;
}
let current_day = current_day.unwrap();
let year_ordinal = self.ii.yearordinal().unwrap();
// Ordinal conversion uses UTC: if we apply local-TZ here, then
// just below we'll end up double-applying.
let date = from_ordinal(year_ordinal + current_day, &UTC);
// We apply the local-TZ here,
let date = options.tzid.ymd(date.year(), date.month(), date.day());
for k in 0..self.timeset.len() {
let res = date.and_hms(0, 0, 0)
+ Duration::hours(self.timeset[k].hour as i64)
+ Duration::minutes(self.timeset[k].minute as i64)
+ Duration::seconds(self.timeset[k].second as i64);
if options.until.is_some() && res > options.until.unwrap() {
return true;
}
if res >= options.dtstart {
self.buffer.push_back(res);
if let Some(count) = self.count {
if count > 0 {
self.count = Some(count - 1);
// self.ii.options.count = Some(count - 1);
}
// This means that the real count is 0, because of the decrement above
if count == 1 {
return true;
}
}
}
}
}
}
// Handle frequency and interval
self.counter_date = increment_counter_date(self.counter_date, &options, filtered);
if self.counter_date.year() > MAX_YEAR {
return true;
}
if options.freq == Frequenzy::Hourly
|| options.freq == Frequenzy::Minutely
|| options.freq == Frequenzy::Secondly
{
self.timeset = self.ii.gettimeset(
&options.freq,
self.counter_date.hour() as usize,
self.counter_date.minute() as usize,
self.counter_date.second() as usize,
0,
);
}
let year = self.counter_date.year();
let month = self.counter_date.month();
self.ii.rebuild(year as isize, month as usize);
}
false
}
}
impl<'a> Iterator for RRuleIter<'a> {
type Item = DateTime<Tz>;
fn next(&mut self) -> Option<Self::Item> {
if !self.buffer.is_empty() {
return self.buffer.pop_front();
}
if self.finished {
return None;
}
self.finished = self.generate();
if self.buffer.is_empty() {
self.finished = true;
}
self.buffer.pop_front()
}
}
impl<'a> IntoIterator for &'a RRule {
type Item = DateTime<Tz>;
type IntoIter = RRuleIter<'a>;
fn into_iter(self) -> Self::IntoIter {
let ii = IterInfo::new(&self.options);
let counter_date = ii.options.dtstart;
// ii.rebuild(counter_date.year() as isize, counter_date.month() as usize);
let timeset = make_timeset(&ii, &counter_date, &ii.options);
let count = ii.options.count.clone();
RRuleIter {
counter_date,
ii,
timeset,
buffer: VecDeque::new(),
finished: false,
count,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[ignore = "Takes too much time, only run when releasing"]
fn iteration_past_max_year_should_not_panic() {
let rrule = "DTSTART:20220201T100000Z\nRRULE:FREQ=DAILY"
.parse::<RRule>()
.unwrap();
rrule.clone().into_iter().nth(15000000);
let rrule = "DTSTART:20220201T100000Z\nRRULE:FREQ=MONTHLY"
.parse::<RRule>()
.unwrap();
rrule.clone().into_iter().nth(15000000);
let rrule = "DTSTART:20220201T100000Z\nRRULE:FREQ=YEARLY"
.parse::<RRule>()
.unwrap();
rrule.clone().into_iter().nth(15000000);
}
}
|
