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src/tools/systemd/time.rs: add helpers to compute CalendarEvents

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This commit is contained in:
Dietmar Maurer 2020-05-15 17:55:54 +02:00
parent 52c70f3f5e
commit a260c74a12
1 changed files with 67 additions and 0 deletions
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67
src/tools/systemd/time.rs
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@ -41,6 +41,73 @@ pub enum DateTimeValue {
Repeated(u32, u32),
}
impl DateTimeValue {
// Test if the entry contains the value
pub fn contains(&self, value: u32) -> bool {
match self {
DateTimeValue::Single(v) => *v == value,
DateTimeValue::Range(start, end) => value >= *start && value <= *end,
DateTimeValue::Repeated(start, repetition) => {
if *repetition > 0 {
let mut found = false;
let mut v = *start;
loop {
if v == value { found = true; break; }
v += *repetition;
if v > value { break; }
}
found
} else {
*start == value
}
}
}
}
// Find an return an entry greater than value
pub fn find_next(list: &[DateTimeValue], value: u32) -> Option<u32> {
let mut next: Option<u32> = None;
let mut set_next = |v: u32| {
if let Some(n) = next {
if v > n { next = Some(v); }
} else {
next = Some(v);
}
};
for spec in list {
match spec {
DateTimeValue::Single(v) => {
if *v > value { set_next(*v); }
}
DateTimeValue::Range(start, end) => {
if value < *start {
set_next(*start);
} else {
let n = value + 1;
if n >= *start && n <= *end {
set_next(n);
}
}
}
DateTimeValue::Repeated(start, repetition) => {
if value < *start {
set_next(*start);
} else if *repetition > 0 {
let mut v = *start;
loop {
if v > value { set_next(v); break; }
v += *repetition;
if v > value { break; }
}
}
}
}
}
next
}
}
#[derive(Default, Debug)]
pub struct CalendarEvent {
pub days: WeekDays,