Function parse_timestamp_string

src/repr/src/strconv.rs:376–406

Use the following grammar to parse `s` into: - `NaiveDate` - `NaiveTime` - Timezone string `NaiveDate` and `NaiveTime` are appropriate to compute a `NaiveDateTime`, which can be used in conjunction with a timezone string to generate a `DateTime `. ```text ::= [ ] ::= <m

(s: &str)

///     <sign> <hours value> <colon> <minutes value>
/// ```
fn parse_timestamp_string(s: &str) -> Result<(NaiveDate, NaiveTime, Timezone), String> {
    if s.is_empty() {
        return Err("timestamp string is empty".into());
    }

    // PostgreSQL special date-time inputs
    // https://www.postgresql.org/docs/12/datatype-datetime.html#id-1.5.7.13.18.8
    // We should add support for other values here, e.g. infinity
    // which @quodlibetor is willing to add to the chrono package.
    if s == "epoch" {
        return Ok((
            NaiveDate::from_ymd_opt(1970, 1, 1).unwrap(),
            NaiveTime::from_hms_opt(0, 0, 0).unwrap(),
            Default::default(),
        ));
    }

    let (ts_string, tz_string, era) = datetime::split_timestamp_string(s);

    let pdt = ParsedDateTime::build_parsed_datetime_timestamp(ts_string, era)?;
    let d: NaiveDate = pdt.compute_date()?;
    let t: NaiveTime = pdt.compute_time()?;

    let offset = if tz_string.is_empty() {
        Default::default()
    } else {
        Timezone::parse(tz_string, TimezoneSpec::Iso)?
    };

    Ok((d, t, offset))
}

/// Parses a [`Date`] from `s`.
pub fn parse_date(s: &str) -> Result<Date, ParseError> {