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//! Parse parts of an ISO 8601-formatted value.
use num_conv::prelude::*;
use crate::convert::*;
use crate::error;
use crate::error::ParseFromDescription::{InvalidComponent, InvalidLiteral};
use crate::format_description::well_known::iso8601::EncodedConfig;
use crate::format_description::well_known::Iso8601;
use crate::parsing::combinator::rfc::iso8601::{
day, dayk, dayo, float, hour, min, month, week, year, ExtendedKind,
};
use crate::parsing::combinator::{ascii_char, sign};
use crate::parsing::{Parsed, ParsedItem};
impl<const CONFIG: EncodedConfig> Iso8601<CONFIG> {
// Basic: [year][month][day]
// Extended: [year]["-"][month]["-"][day]
// Basic: [year][dayo]
// Extended: [year]["-"][dayo]
// Basic: [year]["W"][week][dayk]
// Extended: [year]["-"]["W"][week]["-"][dayk]
/// Parse a date in the basic or extended format. Reduced precision is permitted.
pub(crate) fn parse_date<'a>(
parsed: &'a mut Parsed,
extended_kind: &'a mut ExtendedKind,
) -> impl FnMut(&[u8]) -> Result<&[u8], error::Parse> + 'a {
move |input| {
// Same for any acceptable format.
let ParsedItem(mut input, year) = year(input).ok_or(InvalidComponent("year"))?;
*extended_kind = match ascii_char::<b'-'>(input) {
Some(ParsedItem(new_input, ())) => {
input = new_input;
ExtendedKind::Extended
}
None => ExtendedKind::Basic, // no separator before mandatory month/ordinal/week
};
let parsed_month_day = (|| {
let ParsedItem(mut input, month) = month(input).ok_or(InvalidComponent("month"))?;
if extended_kind.is_extended() {
input = ascii_char::<b'-'>(input)
.ok_or(InvalidLiteral)?
.into_inner();
}
let ParsedItem(input, day) = day(input).ok_or(InvalidComponent("day"))?;
Ok(ParsedItem(input, (month, day)))
})();
let mut ret_error = match parsed_month_day {
Ok(ParsedItem(input, (month, day))) => {
*parsed = parsed
.with_year(year)
.ok_or(InvalidComponent("year"))?
.with_month(month)
.ok_or(InvalidComponent("month"))?
.with_day(day)
.ok_or(InvalidComponent("day"))?;
return Ok(input);
}
Err(err) => err,
};
// Don't check for `None`, as the error from year-month-day will always take priority.
if let Some(ParsedItem(input, ordinal)) = dayo(input) {
*parsed = parsed
.with_year(year)
.ok_or(InvalidComponent("year"))?
.with_ordinal(ordinal)
.ok_or(InvalidComponent("ordinal"))?;
return Ok(input);
}
let parsed_week_weekday = (|| {
let input = ascii_char::<b'W'>(input)
.ok_or((false, InvalidLiteral))?
.into_inner();
let ParsedItem(mut input, week) =
week(input).ok_or((true, InvalidComponent("week")))?;
if extended_kind.is_extended() {
input = ascii_char::<b'-'>(input)
.ok_or((true, InvalidLiteral))?
.into_inner();
}
let ParsedItem(input, weekday) =
dayk(input).ok_or((true, InvalidComponent("weekday")))?;
Ok(ParsedItem(input, (week, weekday)))
})();
match parsed_week_weekday {
Ok(ParsedItem(input, (week, weekday))) => {
*parsed = parsed
.with_iso_year(year)
.ok_or(InvalidComponent("year"))?
.with_iso_week_number(week)
.ok_or(InvalidComponent("week"))?
.with_weekday(weekday)
.ok_or(InvalidComponent("weekday"))?;
return Ok(input);
}
Err((false, _err)) => {}
// This error is more accurate than the one from year-month-day.
Err((true, err)) => ret_error = err,
}
Err(ret_error.into())
}
}
// Basic: ["T"][hour][min][sec]
// Extended: ["T"][hour][":"][min][":"][sec]
// Reduced precision: components after [hour] (including their preceding separator) can be
// omitted. ["T"] can be omitted if there is no date present.
/// Parse a time in the basic or extended format. Reduced precision is permitted.
pub(crate) fn parse_time<'a>(
parsed: &'a mut Parsed,
extended_kind: &'a mut ExtendedKind,
date_is_present: bool,
) -> impl FnMut(&[u8]) -> Result<&[u8], error::Parse> + 'a {
move |mut input| {
if date_is_present {
input = ascii_char::<b'T'>(input)
.ok_or(InvalidLiteral)?
.into_inner();
}
let ParsedItem(mut input, hour) = float(input).ok_or(InvalidComponent("hour"))?;
match hour {
(hour, None) => parsed.set_hour_24(hour).ok_or(InvalidComponent("hour"))?,
(hour, Some(fractional_part)) => {
*parsed = parsed
.with_hour_24(hour)
.ok_or(InvalidComponent("hour"))?
.with_minute((fractional_part * Second::per(Minute) as f64) as _)
.ok_or(InvalidComponent("minute"))?
.with_second(
(fractional_part * Second::per(Hour) as f64 % Minute::per(Hour) as f64)
as _,
)
.ok_or(InvalidComponent("second"))?
.with_subsecond(
(fractional_part * Nanosecond::per(Hour) as f64
% Nanosecond::per(Second) as f64) as _,
)
.ok_or(InvalidComponent("subsecond"))?;
return Ok(input);
}
};
if let Some(ParsedItem(new_input, ())) = ascii_char::<b':'>(input) {
extended_kind
.coerce_extended()
.ok_or(InvalidComponent("minute"))?;
input = new_input;
};
let mut input = match float(input) {
Some(ParsedItem(input, (minute, None))) => {
extended_kind.coerce_basic();
parsed
.set_minute(minute)
.ok_or(InvalidComponent("minute"))?;
input
}
Some(ParsedItem(input, (minute, Some(fractional_part)))) => {
// `None` is valid behavior, so don't error if this fails.
extended_kind.coerce_basic();
*parsed = parsed
.with_minute(minute)
.ok_or(InvalidComponent("minute"))?
.with_second((fractional_part * Second::per(Minute) as f64) as _)
.ok_or(InvalidComponent("second"))?
.with_subsecond(
(fractional_part * Nanosecond::per(Minute) as f64
% Nanosecond::per(Second) as f64) as _,
)
.ok_or(InvalidComponent("subsecond"))?;
return Ok(input);
}
// colon was present, so minutes are required
None if extended_kind.is_extended() => {
return Err(error::Parse::ParseFromDescription(InvalidComponent(
"minute",
)));
}
None => {
// Missing components are assumed to be zero.
*parsed = parsed
.with_minute(0)
.ok_or(InvalidComponent("minute"))?
.with_second(0)
.ok_or(InvalidComponent("second"))?
.with_subsecond(0)
.ok_or(InvalidComponent("subsecond"))?;
return Ok(input);
}
};
if extended_kind.is_extended() {
match ascii_char::<b':'>(input) {
Some(ParsedItem(new_input, ())) => input = new_input,
None => {
*parsed = parsed
.with_second(0)
.ok_or(InvalidComponent("second"))?
.with_subsecond(0)
.ok_or(InvalidComponent("subsecond"))?;
return Ok(input);
}
}
}
let (input, second, subsecond) = match float(input) {
Some(ParsedItem(input, (second, None))) => (input, second, 0),
Some(ParsedItem(input, (second, Some(fractional_part)))) => (
input,
second,
round(fractional_part * Nanosecond::per(Second) as f64) as _,
),
None if extended_kind.is_extended() => {
return Err(error::Parse::ParseFromDescription(InvalidComponent(
"second",
)));
}
// Missing components are assumed to be zero.
None => (input, 0, 0),
};
*parsed = parsed
.with_second(second)
.ok_or(InvalidComponent("second"))?
.with_subsecond(subsecond)
.ok_or(InvalidComponent("subsecond"))?;
Ok(input)
}
}
// Basic: [±][hour][min] or ["Z"]
// Extended: [±][hour][":"][min] or ["Z"]
// Reduced precision: [±][hour] or ["Z"]
/// Parse a UTC offset in the basic or extended format. Reduced precision is supported.
pub(crate) fn parse_offset<'a>(
parsed: &'a mut Parsed,
extended_kind: &'a mut ExtendedKind,
) -> impl FnMut(&[u8]) -> Result<&[u8], error::Parse> + 'a {
move |input| {
if let Some(ParsedItem(input, ())) = ascii_char::<b'Z'>(input) {
*parsed = parsed
.with_offset_hour(0)
.ok_or(InvalidComponent("offset hour"))?
.with_offset_minute_signed(0)
.ok_or(InvalidComponent("offset minute"))?
.with_offset_second_signed(0)
.ok_or(InvalidComponent("offset second"))?;
return Ok(input);
}
let ParsedItem(input, sign) = sign(input).ok_or(InvalidComponent("offset hour"))?;
let mut input = hour(input)
.and_then(|parsed_item| {
parsed_item.consume_value(|hour| {
parsed.set_offset_hour(if sign == b'-' {
-hour.cast_signed()
} else {
hour.cast_signed()
})
})
})
.ok_or(InvalidComponent("offset hour"))?;
if extended_kind.maybe_extended() {
if let Some(ParsedItem(new_input, ())) = ascii_char::<b':'>(input) {
extended_kind
.coerce_extended()
.ok_or(InvalidComponent("offset minute"))?;
input = new_input;
};
}
match min(input) {
Some(ParsedItem(new_input, min)) => {
input = new_input;
parsed
.set_offset_minute_signed(if sign == b'-' {
-min.cast_signed()
} else {
min.cast_signed()
})
.ok_or(InvalidComponent("offset minute"))?;
}
None => {
// Omitted offset minute is assumed to be zero.
parsed.set_offset_minute_signed(0);
}
}
// If `:` was present, the format has already been set to extended. As such, this call
// will do nothing in that case. If there wasn't `:` but minutes were
// present, we know it's the basic format. Do not use `?` on the call, as
// returning `None` is valid behavior.
extended_kind.coerce_basic();
Ok(input)
}
}
}
/// Round wrapper that uses hardware implementation if `std` is available, falling back to manual
/// implementation for `no_std`
fn round(value: f64) -> f64 {
#[cfg(feature = "std")]
{
value.round()
}
#[cfg(not(feature = "std"))]
{
round_impl(value)
}
}
#[cfg(not(feature = "std"))]
#[allow(clippy::missing_docs_in_private_items)]
fn round_impl(value: f64) -> f64 {
debug_assert!(value.is_sign_positive() && !value.is_nan());
let f = value % 1.;
if f < 0.5 {
value - f
} else {
value - f + 1.
}
}