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use core::fmt;
use crate::error::DateTimeFormatError as Error;
use crate::{
date::TimeZoneInput,
time_zone::{FormatTimeZone, TimeZoneFormat, TimeZoneFormatUnit},
DateTimeFormatError,
};
use writeable::Writeable;
pub struct FormattedTimeZone<'l, T>
where
T: TimeZoneInput,
{
pub(crate) time_zone_format: &'l TimeZoneFormat,
pub(crate) time_zone: &'l T,
}
impl<'l, T> Writeable for FormattedTimeZone<'l, T>
where
T: TimeZoneInput,
{
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
match self.write_no_fallback(sink) {
Ok(Ok(r)) => Ok(r),
_ => match self.time_zone_format.fallback_unit {
TimeZoneFormatUnit::LocalizedGmt(fallback) => {
match fallback.format(
sink,
self.time_zone,
&self.time_zone_format.data_payloads,
) {
Ok(Ok(r)) => Ok(r),
Ok(Err(e)) => Err(e),
Err(_e) => {
debug_assert!(false, "{:?}", _e);
Err(core::fmt::Error)
}
}
}
TimeZoneFormatUnit::Iso8601(fallback) => {
match fallback.format(
sink,
self.time_zone,
&self.time_zone_format.data_payloads,
) {
Ok(Ok(r)) => Ok(r),
Ok(Err(e)) => Err(e),
Err(_e) => {
debug_assert!(false, "{:?}", _e);
Err(core::fmt::Error)
}
}
}
_ => Err(core::fmt::Error),
},
}
}
}
impl<'l, T> fmt::Display for FormattedTimeZone<'l, T>
where
T: TimeZoneInput,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.write_to(f)
}
}
impl<'l, T> FormattedTimeZone<'l, T>
where
T: TimeZoneInput,
{
pub fn write_no_fallback<W>(&self, w: &mut W) -> Result<fmt::Result, Error>
where
W: core::fmt::Write + ?Sized,
{
for unit in self.time_zone_format.format_units.iter() {
match unit.format(w, self.time_zone, &self.time_zone_format.data_payloads) {
Ok(r) => return Ok(r),
Err(DateTimeFormatError::UnsupportedOptions) => continue,
Err(e) => return Err(e),
}
}
Err(DateTimeFormatError::UnsupportedOptions)
}
}