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Add helper function to parse string by several datetime formats

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Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This commit is contained in:
Matthias Beyer 2019-10-03 14:53:00 +02:00
parent af6d67416b
commit f5a4331d0a
1 changed files with 25 additions and 0 deletions
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25
lib/etc/libimagutil/src/date.rs
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@ -45,3 +45,28 @@ pub fn datetime_from_string<S>(s: S) -> Result<NaiveDateTime, ParseError>
NaiveDateTime::parse_from_str(s.as_ref(), NAIVE_DATETIME_STRING_FORMAT) NaiveDateTime::parse_from_str(s.as_ref(), NAIVE_DATETIME_STRING_FORMAT)
} }
/// Try to parse `s` with all formats from `fmts`
///
/// The function returns an `Option<NaiveDateTime>`, so that the user of the function can generate
/// the appropriate error message themselves.
///
pub fn try_to_parse_datetime_from_string<'a, S, Formats, Format>(s: S, fmts: Formats) -> Option<NaiveDateTime>
where S: AsRef<str>,
Formats: Iterator<Item = Format>,
Format: AsRef<str>
{
fmts.fold(None, |a, f| a.or_else(|| NaiveDateTime::parse_from_str(s.as_ref(), f.as_ref()).ok()))
}
#[test]
fn test_try_to_parse_datetime_from_string() {
let formats = vec![
"%Y%m%dT%H%M%S",
"%Y%m%dT%H%M%SZ"
];
let text = "20190730T160527Z";
assert!(try_to_parse_datetime_from_string(text, formats.iter()).is_some())
}