258 lines
11 KiB
Rust
258 lines
11 KiB
Rust
use chrono::{
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DateTime, Utc, Local, TimeZone, LocalResult, FixedOffset, Datelike,
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Duration,
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};
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use crate::error::{Result, Error};
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mod strings;
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use strings::{NUMBER_VALUES, HUMAN_REGEX, DATETIME_REGEX, HOUR_REGEX};
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#[allow(clippy::too_many_arguments)]
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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.with_ymd_and_hms(
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year, month, day, 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(t.with_timezone(&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_opt(second).unwrap()
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} else {
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FixedOffset::west_opt(second).unwrap()
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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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if let Some(caps) = HUMAN_REGEX.captures(input) {
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let hours = if caps.name("hour").is_some() {
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if let Some(m) = caps.name("hcase") {
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NUMBER_VALUES[m.as_str()]
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} else if let Some(m) = caps.name("hdigit") {
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NUMBER_VALUES[m.as_str()]
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} else if let Some(m) = caps.name("hten") {
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NUMBER_VALUES[m.as_str()]
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} else if caps.name("hcomposed").is_some() {
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NUMBER_VALUES[&caps["hcten"]] + NUMBER_VALUES[&caps["hcdigit"]]
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} else if let Some(m) = caps.name("htextualnum") {
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m.as_str().parse().unwrap()
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} else if caps.name("half").is_some() {
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0.5
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} else {
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unreachable!()
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}
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} else {
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0.
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};
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let minutes = if caps.name("minute").is_some() {
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if let Some(m) = caps.name("mcase") {
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NUMBER_VALUES[m.as_str()]
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} else if let Some(m) = caps.name("mdigit") {
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NUMBER_VALUES[m.as_str()]
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} else if let Some(m) = caps.name("mten") {
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NUMBER_VALUES[m.as_str()]
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} else if caps.name("mcomposed").is_some() {
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NUMBER_VALUES[&caps["mcten"]] + NUMBER_VALUES[&caps["mcdigit"]]
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} else if let Some(m) = caps.name("mtextualnum") {
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m.as_str().parse().unwrap()
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} else {
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unreachable!()
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}
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} else {
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0.
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};
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return Ok(Utc.from_utc_datetime(
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&(Local::now() - Duration::minutes((hours * 60. + minutes) as i64)).naive_utc()
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));
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}
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// first try to parse as a full datetime with optional timezone
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if let Some(caps) = DATETIME_REGEX.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 caps.name("offset").is_some() {
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if caps.name("utc").is_some() {
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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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if let Some(caps) = HOUR_REGEX.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 caps.name("offset").is_some() {
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if caps.name("utc").is_some() {
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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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pub fn parse_hours(input: &str) -> Result<u16> {
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input.parse().map_err(|_| Error::InvalidHours(input.to_string()))
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}
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#[cfg(test)]
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mod tests {
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use chrono::{TimeZone, Duration, Timelike};
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use super::*;
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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.with_ymd_and_hms(2021, 5, 21, 11, 36, 0).unwrap());
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assert_eq!(parse_time("2021-05-21 11:36:12").unwrap(), Local.with_ymd_and_hms(2021, 5, 21, 11, 36, 12).unwrap());
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assert_eq!(parse_time("2021-05-21T11:36").unwrap(), Local.with_ymd_and_hms(2021, 5, 21, 11, 36, 0).unwrap());
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assert_eq!(parse_time("2021-05-21T11:36:12").unwrap(), Local.with_ymd_and_hms(2021, 5, 21, 11, 36, 12).unwrap());
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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.with_ymd_and_hms(2021, 5, 21, 0, 0, 0).unwrap());
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}
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#[test]
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fn parse_hour() {
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let localdate = Local::now().with_hour(0).unwrap().with_minute(0).unwrap().with_second(0).unwrap().with_nanosecond(0).unwrap();
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assert_eq!(parse_time("11:36").unwrap(), localdate.with_hour(11).unwrap().with_minute(36).unwrap().with_timezone(&Utc));
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assert_eq!(parse_time("11:36:35").unwrap(), localdate.with_hour(11).unwrap().with_minute(36).unwrap().with_second(35).unwrap().with_timezone(&Utc));
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}
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#[test]
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fn parse_hour_with_timezone() {
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let hours: i32 = 3600;
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let todayutc = Utc::now().date_naive();
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assert_eq!(parse_time("11:36Z").unwrap(), todayutc.and_hms_opt(11, 36, 0).unwrap().and_local_timezone(Utc).unwrap());
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assert_eq!(parse_time("11:36:35z").unwrap(), todayutc.and_hms_opt(11, 36, 35).unwrap().and_local_timezone(Utc).unwrap());
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let offset = FixedOffset::west_opt(5 * hours).unwrap();
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let today_at_offset = offset.from_utc_datetime(&Utc::now().naive_utc()).with_hour(0).unwrap().with_minute(0).unwrap().with_second(0).unwrap().with_nanosecond(0).unwrap();
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assert_eq!(parse_time("11:36-5:00").unwrap(), today_at_offset.with_hour(11).unwrap().with_minute(36).unwrap().with_timezone(&Utc));
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let offset = FixedOffset::east_opt(5 * hours).unwrap();
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let today_at_offset = offset.from_utc_datetime(&Utc::now().naive_utc()).with_hour(0).unwrap().with_minute(0).unwrap().with_second(0).unwrap().with_nanosecond(0).unwrap();
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assert_eq!(parse_time("11:36:35+5:00").unwrap(), today_at_offset.with_hour(11).unwrap().with_minute(36).unwrap().with_second(35).unwrap().with_timezone(&Utc));
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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.with_ymd_and_hms(2021, 5, 21, 11, 36, 12).unwrap());
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assert_eq!(parse_time("2021-05-21T11:36:12-3:00").unwrap(), Utc.with_ymd_and_hms(2021, 5, 21, 14, 36, 12).unwrap());
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assert_eq!(parse_time("2021-05-21T11:36:12+3:00").unwrap(), Utc.with_ymd_and_hms(2021, 5, 21, 8, 36, 12).unwrap());
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}
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fn time_diff(t1: DateTime<Utc>, t2: DateTime<Local>) {
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let diff = dbg!(dbg!(t1) - dbg!(Utc.from_utc_datetime(&t2.naive_utc()))).num_seconds().abs();
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assert!(diff < 1, "too different: {} s", diff);
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}
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#[test]
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fn parse_human_times() {
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// hours
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time_diff(parse_time("an hour ago").unwrap(), Local::now() - Duration::hours(1));
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time_diff(parse_time("two hours ago").unwrap(), Local::now() - Duration::hours(2));
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time_diff(parse_time("ten hours ago").unwrap(), Local::now() - Duration::hours(10));
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time_diff(parse_time("twenty one hours ago").unwrap(), Local::now() - Duration::hours(21));
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time_diff(parse_time("15 hours ago").unwrap(), Local::now() - Duration::hours(15));
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// minutes
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time_diff(parse_time("a minute ago").unwrap(), Local::now() - Duration::minutes(1));
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time_diff(parse_time("two minutes ago").unwrap(), Local::now() - Duration::minutes(2));
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time_diff(parse_time("thirty minutes ago").unwrap(), Local::now() - Duration::minutes(30));
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time_diff(parse_time("forty one minutes ago").unwrap(), Local::now() - Duration::minutes(41));
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time_diff(parse_time("1 minute ago").unwrap(), Local::now() - Duration::minutes(1));
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time_diff(parse_time("23 minutes ago").unwrap(), Local::now() - Duration::minutes(23));
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time_diff(parse_time("half an hour ago").unwrap(), Local::now() - Duration::minutes(30));
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// mixed
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time_diff(parse_time("an hour 10 minutes ago").unwrap(), Local::now() - Duration::minutes(70));
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time_diff(parse_time("2 hours five minutes ago").unwrap(), Local::now() - Duration::minutes(125));
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time_diff(parse_time("an hour 12 minutes ago").unwrap(), Local::now() - Duration::minutes(60 + 12));
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// abbreviated
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time_diff(parse_time("2hrs ago").unwrap(), Local::now() - Duration::hours(2));
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time_diff(parse_time("10min ago").unwrap(), Local::now() - Duration::minutes(10));
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time_diff(parse_time("1hr ago").unwrap(), Local::now() - Duration::hours(1));
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time_diff(parse_time("1h ago").unwrap(), Local::now() - Duration::hours(1));
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time_diff(parse_time("1h 5m ago").unwrap(), Local::now() - Duration::minutes(60 + 5));
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time_diff(parse_time("1h5m ago").unwrap(), Local::now() - Duration::minutes(60 + 5));
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time_diff(parse_time("a m ago").unwrap(), Local::now() - Duration::minutes(1));
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time_diff(parse_time("an hr ago").unwrap(), Local::now() - Duration::hours(1));
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time_diff(parse_time("a min ago").unwrap(), Local::now() - Duration::minutes(1));
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time_diff(parse_time("two hours and fifteen minuts ago").unwrap(), Local::now() - Duration::minutes(2 * 60 + 15));
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time_diff(parse_time("two hours and thirty minuts ago").unwrap(), Local::now() - Duration::minutes(2 * 60 + 30));
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// time_diff(parse_time("two and a half hours ago").unwrap(), Local::now() - Duration::minutes(150));
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}
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}
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