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/*
* SPDX-FileCopyrightText: 2021 Fredrik Meringdal, Ralph Bisschops <https://github.com/fmeringdal/rust-rrule>
*
* SPDX-License-Identifier: Apache-2.0 OR MIT
*/
use super::counter_date::DateTimeIter;
use super::rrule::RRule;
use super::utils::add_time_to_date;
use super::{build_pos_list, utils::date_from_ordinal, IterInfo, MAX_ITER_LOOP};
use super::{get_hour, get_minute, get_second};
use crate::common::timezone::Tz;
use crate::icalendar::ICalendarFrequency;
use chrono::NaiveTime;
use std::collections::VecDeque;
#[derive(Debug, Clone)]
pub(crate) struct RRuleIter {
pub(crate) counter_date: DateTimeIter,
pub(crate) ii: IterInfo,
pub(crate) timeset: Vec<NaiveTime>,
pub(crate) dt_start: chrono::DateTime<Tz>,
pub(crate) buffer: VecDeque<chrono::DateTime<Tz>>,
pub(crate) finished: bool,
pub(crate) count: Option<u32>,
pub(crate) limited: bool,
pub(crate) was_limited: bool,
}
impl RRuleIter {
pub(crate) fn new(rrule: &RRule, dt_start: &chrono::DateTime<Tz>, limited: bool) -> Self {
let ii = IterInfo::new(rrule, dt_start);
let hour = get_hour(dt_start);
let minute = get_minute(dt_start);
let second = get_second(dt_start);
let timeset = ii.get_timeset(hour, minute, second);
let count = ii.rrule().count;
Self {
counter_date: dt_start.into(),
ii,
timeset,
dt_start: *dt_start,
buffer: VecDeque::new(),
finished: false,
count,
limited,
was_limited: false,
}
}
/// Attempts to add a date to the result. Returns `true` if we should
/// terminate the iteration.
fn try_add_datetime(
dt: chrono::DateTime<Tz>,
rrule: &RRule,
count: &mut Option<u32>,
buffer: &mut VecDeque<chrono::DateTime<Tz>>,
dt_start: &chrono::DateTime<Tz>,
) -> bool {
if matches!(rrule.until, Some(until) if dt > until) {
// We can break because `pos_list` is sorted and
// all the next dates will only be larger than `until`.
return true;
}
if dt >= *dt_start {
buffer.push_back(dt);
if let Some(count) = count {
*count -= 1;
if *count == 0 {
return true;
}
}
}
false
}
/// Generates a list of dates that will be added to the buffer.
/// Returns true if finished, no more items should/can be returned.
fn generate(&mut self) -> bool {
// Do early check if done (if known)
if self.finished {
return true;
}
// Check if the count is set, and if 0
if matches!(self.count, Some(count) if count == 0) {
return true;
}
let rrule = self.ii.rrule();
if rrule.interval == 0 {
return true;
}
let mut loop_counter: u32 = 0;
// Loop until there is at least 1 item in the buffer.
while self.buffer.is_empty() {
// Prevent infinite loops
if self.limited {
loop_counter += 1;
if loop_counter >= MAX_ITER_LOOP {
self.finished = true;
self.was_limited = true;
return true;
}
}
let rrule = self.ii.rrule();
let dayset = self.ii.get_dayset(
rrule.freq,
self.counter_date.year,
self.counter_date.month,
self.counter_date.day,
);
let tz = self.dt_start.timezone();
if rrule.by_set_pos.is_empty() {
// Loop over `start..end`
for current_day in &dayset {
let current_day = *current_day as i64;
let year_ordinal = self.ii.year_ordinal();
// Ordinal conversion uses UTC: if we apply local-TZ here, then
// just below we'll end up double-applying.
let date = date_from_ordinal(year_ordinal + current_day);
for time in &self.timeset {
let Some(dt) = add_time_to_date(tz, date, *time) else {
continue;
};
if Self::try_add_datetime(
dt,
rrule,
&mut self.count,
&mut self.buffer,
&self.dt_start,
) {
return true;
}
}
}
} else {
let pos_list = build_pos_list(
&rrule.by_set_pos,
&dayset,
&self.timeset,
self.ii.year_ordinal(),
self.dt_start.timezone(),
);
for dt in pos_list {
if Self::try_add_datetime(
dt,
rrule,
&mut self.count,
&mut self.buffer,
&self.dt_start,
) {
return true;
}
}
}
let increment_day = dayset.is_empty();
if self.counter_date.increment(rrule, increment_day).is_err() {
self.finished = true;
return true;
}
if matches!(
rrule.freq,
ICalendarFrequency::Hourly
| ICalendarFrequency::Minutely
| ICalendarFrequency::Secondly
) {
let hour = self.counter_date.hour as u8;
let minute = self.counter_date.minute as u8;
let second = self.counter_date.second as u8;
self.timeset = self.ii.get_timeset_unchecked(hour, minute, second);
}
self.ii.rebuild(&self.counter_date);
}
// Indicate that there might be more items on the next iteration.
false
}
}
impl Iterator for RRuleIter {
type Item = chrono::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()
}
}