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use crate::error::DateTimeFormatterError as Error;
use crate::fields::{self, FieldSymbol};
use crate::input::{
DateTimeInput, DateTimeInputWithLocale, ExtractedDateTimeInput, ExtractedTimeZoneInput,
LocalizedDateTimeInput, TimeZoneInput,
};
use crate::pattern::{runtime, PatternItem};
use crate::{raw, FormattedTimeZone};
use core::fmt;
use writeable::Writeable;
use super::datetime;
#[allow(missing_docs)]
pub struct FormattedZonedDateTime<'l> {
pub(crate) zoned_datetime_format: &'l raw::ZonedDateTimeFormatter,
pub(crate) datetime: ExtractedDateTimeInput,
pub(crate) time_zone: ExtractedTimeZoneInput,
}
impl<'l> Writeable for FormattedZonedDateTime<'l> {
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
write_pattern(
self.zoned_datetime_format,
&self.datetime,
&self.time_zone,
sink,
)
.map_err(|_| core::fmt::Error)
}
}
impl<'l> fmt::Display for FormattedZonedDateTime<'l> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write_pattern(
self.zoned_datetime_format,
&self.datetime,
&self.time_zone,
f,
)
.map_err(|_| core::fmt::Error)
}
}
pub(crate) fn write_pattern<D, Z, W>(
zoned_datetime_format: &raw::ZonedDateTimeFormatter,
datetime: &D,
time_zone: &Z,
w: &mut W,
) -> Result<(), Error>
where
D: DateTimeInput,
Z: TimeZoneInput,
W: fmt::Write + ?Sized,
{
let locale = &zoned_datetime_format.datetime_format.locale;
let patterns = &zoned_datetime_format.datetime_format.patterns;
let loc_datetime = DateTimeInputWithLocale::new(
datetime,
zoned_datetime_format
.datetime_format
.week_data
.as_ref()
.map(|d| &d.get().0),
locale,
);
let pattern = patterns.get().0.select(
&loc_datetime,
zoned_datetime_format.datetime_format.ordinal_rules.as_ref(),
)?;
let mut iter = pattern.items.iter().peekable();
loop {
match iter.next() {
Some(PatternItem::Field(field)) => write_field(
pattern,
field,
iter.peek(),
zoned_datetime_format,
&loc_datetime,
time_zone,
w,
)?,
Some(PatternItem::Literal(ch)) => w.write_char(ch)?,
None => break,
}
}
Ok(())
}
fn write_field<D, Z, W>(
pattern: &runtime::Pattern,
field: fields::Field,
next_item: Option<&PatternItem>,
zoned_datetime_format: &raw::ZonedDateTimeFormatter,
loc_datetime: &impl LocalizedDateTimeInput<D>,
time_zone: &Z,
w: &mut W,
) -> Result<(), Error>
where
D: DateTimeInput,
Z: TimeZoneInput,
W: fmt::Write + ?Sized,
{
let date_symbols = zoned_datetime_format
.datetime_format
.date_symbols
.as_ref()
.map(|s| s.get());
let time_symbols = zoned_datetime_format
.datetime_format
.time_symbols
.as_ref()
.map(|s| s.get());
match field.symbol {
FieldSymbol::TimeZone(_time_zone) => FormattedTimeZone {
time_zone_format: &zoned_datetime_format.time_zone_format,
time_zone,
}
.write_to(w)?,
_ => datetime::write_field(
pattern,
field,
next_item,
date_symbols,
time_symbols,
loc_datetime,
&zoned_datetime_format.datetime_format.fixed_decimal_format,
w,
)?,
}
Ok(())
}