206 lines
7.6 KiB
Rust
206 lines
7.6 KiB
Rust
use chrono::{
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DateTime, Utc, Local, TimeZone, LocalResult, FixedOffset, Datelike,
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};
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use regex::Regex;
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use crate::error::{Result, Error};
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fn date_from_parts<T: TimeZone>(
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timezone: T, input: &str, year: i32, month: u32, day: u32, hour: u32,
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minute: u32, second: u32
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) -> Result<DateTime<Utc>> {
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let try_date = timezone.ymd_opt(
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year, month, day
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).and_hms_opt(
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hour, minute, second
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);
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match try_date {
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LocalResult::None => Err(Error::NoneLocalTime(input.into())),
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LocalResult::Single(t) => Ok(Utc.from_utc_datetime(&t.naive_utc())),
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LocalResult::Ambiguous(t1, t2) => Err(Error::AmbiguousLocalTime {
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orig: input.into(),
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t1: t1.naive_utc(),
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t2: t2.naive_utc(),
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}),
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}
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}
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fn offset_from_parts(east: bool, hours: i32, minutes: i32) -> FixedOffset {
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let mut second: i32 = hours * 60 * 60;
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second += minutes * 60;
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if east {
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FixedOffset::east(second)
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} else {
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FixedOffset::west(second)
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}
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}
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#[inline]
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fn date_parts<T: Datelike>(t: T) -> (i32, u32, u32) {
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(t.year(), t.month(), t.day())
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}
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pub fn parse_time(input: &str) -> Result<DateTime<Utc>> {
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// first try to parse as a full datetime with optional timezone
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let datetime_re = Regex::new(r"(?xi)
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(?P<year>\d{4}) # the year, mandatory
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.
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(?P<month>\d{2}) # the month, mandatory
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.
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(?P<day>\d{2}) # the day, mandatory
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(. # a separator
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(?P<hour>\d{2}) # the hour, optional
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(. # a separator
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(?P<minute>\d{2})? # the minute, optional
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(. # a separator
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(?P<second>\d{2}))?)?)? # the second, optional, implies minute
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(?P<offset>
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(?P<utc>Z)|((?P<sign>\+|-)(?P<ohour>\d{1,2}):(?P<omin>\d{2}))
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)? # the offset, optional
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").unwrap();
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if let Some(caps) = datetime_re.captures(input) {
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let year: i32 = (&caps["year"]).parse().unwrap();
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let month: u32 = (&caps["month"]).parse().unwrap();
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let day: u32 = (&caps["day"]).parse().unwrap();
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let hour: u32 = caps.name("hour").map(|t| t.as_str().parse().unwrap()).unwrap_or(0);
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let minute: u32 = caps.name("minute").map(|t| t.as_str().parse().unwrap()).unwrap_or(0);
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let second: u32 = caps.name("second").map(|t| t.as_str().parse().unwrap()).unwrap_or(0);
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return if let Some(_) = caps.name("offset") {
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if let Some(_) = caps.name("utc") {
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date_from_parts(
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Utc, input, year, month, day, hour, minute, second,
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)
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} else {
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let hours: i32 = (&caps["ohour"]).parse().unwrap();
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let minutes: i32 = (&caps["omin"]).parse().unwrap();
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let fo = offset_from_parts(&caps["sign"] == "+", hours, minutes);
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date_from_parts(
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fo, input, year, month, day, hour, minute, second,
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)
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}
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} else {
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// start with a local time
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date_from_parts(
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Local, input, year, month, day, hour, minute, second,
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)
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};
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}
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let hour_re = Regex::new(r"(?xi)
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(?P<hour>\d{1,2}) # the hour, mandatory
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(. # a separator
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(?P<minute>\d{2})? # the minute, optional
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(. # a separator
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(?P<second>\d{2}))?)? # the second, optional, implies minute
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(?P<offset>
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(?P<utc>Z)|((?P<sign>\+|-)(?P<ohour>\d{1,2}):(?P<omin>\d{2}))
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)? # the offset, optional
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").unwrap();
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if let Some(caps) = hour_re.captures(input) {
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let hour: u32 = (&caps["hour"]).parse().unwrap();
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let minute: u32 = caps.name("minute").map(|t| t.as_str().parse().unwrap()).unwrap_or(0);
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let second: u32 = caps.name("second").map(|t| t.as_str().parse().unwrap()).unwrap_or(0);
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return if let Some(_) = caps.name("offset") {
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if let Some(_) = caps.name("utc") {
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let (year, month, day) = date_parts(Utc::now());
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date_from_parts(
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Utc, input, year, month, day, hour, minute, second,
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)
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} else {
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let hours: i32 = (&caps["ohour"]).parse().unwrap();
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let minutes: i32 = (&caps["omin"]).parse().unwrap();
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let fo = offset_from_parts(&caps["sign"] == "+", hours, minutes);
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let (year, month, day) = date_parts(fo.from_utc_datetime(&Utc::now().naive_utc()));
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date_from_parts(
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fo, input, year, month, day, hour, minute, second,
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)
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}
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} else {
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let (year, month, day) = date_parts(Local::now());
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date_from_parts(
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Local, input, year, month, day, hour, minute, second,
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)
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};
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}
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Err(Error::DateTimeParseError(input.into()))
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}
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#[cfg(test)]
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mod tests {
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use chrono::{TimeZone, Duration};
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use super::*;
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const HOURS: i32 = 3600;
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#[test]
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fn parse_datetime_string() {
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assert_eq!(parse_time("2021-05-21 11:36").unwrap(), Local.ymd(2021, 5, 21).and_hms(11, 36, 0));
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assert_eq!(parse_time("2021-05-21 11:36:12").unwrap(), Local.ymd(2021, 5, 21).and_hms(11, 36, 12));
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assert_eq!(parse_time("2021-05-21T11:36").unwrap(), Local.ymd(2021, 5, 21).and_hms(11, 36, 0));
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assert_eq!(parse_time("2021-05-21T11:36:12").unwrap(), Local.ymd(2021, 5, 21).and_hms(11, 36, 12));
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}
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#[test]
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fn parse_date() {
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assert_eq!(parse_time("2021-05-21").unwrap(), Local.ymd(2021, 5, 21).and_hms(0, 0, 0));
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}
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#[test]
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fn parse_hour() {
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let localdate = Local::now().date();
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assert_eq!(parse_time("11:36").unwrap(), localdate.and_hms(11, 36, 0));
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assert_eq!(parse_time("11:36:35").unwrap(), localdate.and_hms(11, 36, 35));
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}
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#[test]
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fn parse_hour_with_timezone() {
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let todayutc = Utc::now().date();
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assert_eq!(parse_time("11:36Z").unwrap(), todayutc.and_hms(11, 36, 0));
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assert_eq!(parse_time("11:36:35z").unwrap(), todayutc.and_hms(11, 36, 35));
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let offset = FixedOffset::west(5 * HOURS);
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let todayoffset = offset.from_utc_datetime(&Utc::now().naive_utc()).date();
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assert_eq!(parse_time("11:36-5:00").unwrap(), todayoffset.and_hms(11, 36, 0));
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let offset = FixedOffset::east(5 * HOURS);
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let todayoffset = offset.from_utc_datetime(&Utc::now().naive_utc()).date();
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assert_eq!(parse_time("11:36:35+5:00").unwrap(), todayoffset.and_hms(11, 36, 35));
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}
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#[test]
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fn parse_with_specified_timezone() {
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assert_eq!(parse_time("2021-05-21T11:36:12Z").unwrap(), Utc.ymd(2021, 5, 21).and_hms(11, 36, 12));
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assert_eq!(parse_time("2021-05-21T11:36:12-3:00").unwrap(), Utc.ymd(2021, 5, 21).and_hms(14, 36, 12));
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assert_eq!(parse_time("2021-05-21T11:36:12+3:00").unwrap(), Utc.ymd(2021, 5, 21).and_hms(8, 36, 12));
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}
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#[test]
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fn parse_human_time() {
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assert_eq!(parse_time("an hour ago").unwrap(), Local::now() - Duration::hours(1));
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assert_eq!(parse_time("one hour ago").unwrap(), Local::now() - Duration::hours(1));
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assert_eq!(parse_time("two hours ago").unwrap(), Local::now() - Duration::hours(2));
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assert_eq!(parse_time("three hours ago").unwrap(), Local::now() - Duration::hours(2));
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assert_eq!(parse_time("4 hours ago").unwrap(), Local::now().date().and_hms(11, 36, 12));
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assert_eq!(parse_time("a minute ago").unwrap(), Local::now().date().and_hms(11, 36, 12));
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assert_eq!(parse_time("two minutes ago").unwrap(), Local::now().date().and_hms(11, 36, 12));
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assert_eq!(parse_time("4 minutes ago").unwrap(), Local::now().date().and_hms(11, 36, 12));
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}
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}
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