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#![allow(clippy::exhaustive_structs)]
mod length;
pub(crate) mod symbols;
use displaydoc::Display;
pub use length::{FieldLength, LengthError};
pub use symbols::*;
use core::{
cmp::{Ord, PartialOrd},
convert::TryFrom,
};
#[derive(Display, Debug, Copy, Clone)]
#[non_exhaustive]
pub enum Error {
#[displaydoc("Field {0:?} is not a valid length")]
InvalidLength(FieldSymbol),
}
#[cfg(feature = "std")]
impl std::error::Error for Error {}
#[derive(Debug, Eq, PartialEq, Clone, Copy, Ord, PartialOrd)]
#[cfg_attr(
feature = "datagen",
derive(serde::Serialize, databake::Bake),
databake(path = icu_datetime::fields),
)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize))]
#[zerovec::make_ule(FieldULE)]
pub struct Field {
pub symbol: FieldSymbol,
pub length: FieldLength,
}
impl Field {
pub(crate) fn get_length_type(&self) -> TextOrNumeric {
match self.symbol {
FieldSymbol::Era => TextOrNumeric::Text,
FieldSymbol::Year(year) => year.get_length_type(self.length),
FieldSymbol::Month(month) => month.get_length_type(self.length),
FieldSymbol::Week(week) => week.get_length_type(self.length),
FieldSymbol::Day(day) => day.get_length_type(self.length),
FieldSymbol::Weekday(weekday) => weekday.get_length_type(self.length),
FieldSymbol::DayPeriod(day_period) => day_period.get_length_type(self.length),
FieldSymbol::Hour(hour) => hour.get_length_type(self.length),
FieldSymbol::Minute => TextOrNumeric::Numeric,
FieldSymbol::Second(second) => second.get_length_type(self.length),
FieldSymbol::TimeZone(zone) => zone.get_length_type(self.length),
}
}
}
impl FieldULE {
#[inline]
pub(crate) fn validate_bytes(bytes: (u8, u8)) -> Result<(), zerovec::ZeroVecError> {
symbols::FieldSymbolULE::validate_byte(bytes.0)?;
length::FieldLengthULE::validate_byte(bytes.1)?;
Ok(())
}
}
impl From<(FieldSymbol, FieldLength)> for Field {
fn from(input: (FieldSymbol, FieldLength)) -> Self {
Self {
symbol: input.0,
length: input.1,
}
}
}
impl TryFrom<(FieldSymbol, usize)> for Field {
type Error = Error;
fn try_from(input: (FieldSymbol, usize)) -> Result<Self, Self::Error> {
let length = if input.0 != FieldSymbol::Second(crate::fields::Second::FractionalSecond) {
FieldLength::from_idx(input.1 as u8).map_err(|_| Self::Error::InvalidLength(input.0))?
} else if input.1 <= 127 {
FieldLength::from_idx(128 + input.1 as u8)
.map_err(|_| Self::Error::InvalidLength(input.0))?
} else {
return Err(Self::Error::InvalidLength(input.0));
};
Ok(Self {
symbol: input.0,
length,
})
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::fields::{Field, FieldLength, FieldSymbol, Second, Year};
use zerovec::ule::{AsULE, ULE};
#[test]
fn test_field_as_ule() {
let samples = &[
(
Field::from((FieldSymbol::Minute, FieldLength::TwoDigit)),
&[FieldSymbol::Minute.idx(), FieldLength::TwoDigit.idx()],
),
(
Field::from((FieldSymbol::Year(Year::Calendar), FieldLength::Wide)),
&[
FieldSymbol::Year(Year::Calendar).idx(),
FieldLength::Wide.idx(),
],
),
(
Field::from((FieldSymbol::Year(Year::WeekOf), FieldLength::Wide)),
&[
FieldSymbol::Year(Year::WeekOf).idx(),
FieldLength::Wide.idx(),
],
),
(
Field::from((FieldSymbol::Second(Second::Millisecond), FieldLength::One)),
&[
FieldSymbol::Second(Second::Millisecond).idx(),
FieldLength::One.idx(),
],
),
];
for (ref_field, ref_bytes) in samples {
let ule = ref_field.to_unaligned();
assert_eq!(ULE::as_byte_slice(&[ule]), *ref_bytes);
let field = Field::from_unaligned(ule);
assert_eq!(field, *ref_field);
}
}
#[test]
fn test_field_ule() {
let samples = &[(
&[
Field::from((FieldSymbol::Year(Year::Calendar), FieldLength::Wide)),
Field::from((FieldSymbol::Second(Second::Millisecond), FieldLength::One)),
],
&[
&[
FieldSymbol::Year(Year::Calendar).idx(),
FieldLength::Wide.idx(),
],
&[
FieldSymbol::Second(Second::Millisecond).idx(),
FieldLength::One.idx(),
],
],
)];
for (ref_field, ref_bytes) in samples {
let mut bytes: Vec<u8> = vec![];
for item in ref_field.iter() {
let ule = item.to_unaligned();
bytes.extend(ULE::as_byte_slice(&[ule]));
}
let mut bytes2: Vec<u8> = vec![];
for seq in ref_bytes.iter() {
bytes2.extend_from_slice(*seq);
}
assert!(FieldULE::validate_byte_slice(&bytes).is_ok());
assert_eq!(bytes, bytes2);
}
}
}