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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
use core::str::FromStr;
use crate::parser::ParseError;
use crate::subtags::{Region, Subtag};
impl_tinystr_subtag!(
/// A subdivision suffix used in [`SubdivisionId`].
///
/// This suffix represents a specific subdivision code under a given [`Region`].
/// For example the value of [`SubdivisionId`] may be `gbsct`, where the [`SubdivisionSuffix`]
/// is `sct` for Scotland.
///
/// Such a value associated with a key `rg` means that the locale should use Unit Preferences
/// (default calendar, currency, week data, time cycle, measurement system) for Scotland, even if the
/// [`LanguageIdentifier`](crate::LanguageIdentifier) is `en-US`.
///
/// A subdivision suffix has to be a sequence of alphanumerical characters no
/// shorter than one and no longer than four characters.
///
///
/// # Examples
///
/// ```
/// use icu::locale::extensions::unicode::{subdivision_suffix, SubdivisionSuffix};
///
/// let ss: SubdivisionSuffix =
/// "sct".parse().expect("Failed to parse a SubdivisionSuffix.");
///
/// assert_eq!(ss, subdivision_suffix!("sct"));
/// ```
SubdivisionSuffix,
extensions::unicode,
subdivision_suffix,
extensions_unicode_subdivision_suffix,
1..=4,
s,
s.is_ascii_alphanumeric(),
s.to_ascii_lowercase(),
s.is_ascii_alphanumeric() && s.is_ascii_lowercase(),
InvalidExtension,
["sct"],
["toolooong"],
);
/// A Subivision Id as defined in [`Unicode Locale Identifier`].
///
/// Subdivision Id is used in [`Unicode`] extensions:
/// * `rg` - Regional Override
/// * `sd` - Regional Subdivision
///
/// In both cases the subdivision is composed of a [`Region`] and a [`SubdivisionSuffix`] which represents
/// different meaning depending on the key.
///
/// [`Unicode Locale Identifier`]: https://unicode.org/reports/tr35/tr35.html#unicode_subdivision_id
/// [`Unicode`]: crate::extensions::unicode::Unicode
///
/// # Examples
///
/// ```
/// use icu::locale::{
/// subtags::region,
/// extensions::unicode::{subdivision_suffix, SubdivisionId}
/// };
///
/// let ss = subdivision_suffix!("zzzz");
/// let region = region!("gb");
///
/// let si = SubdivisionId::new(region, ss);
///
/// assert_eq!(si.to_string(), "gbzzzz");
/// ```
#[derive(Debug, PartialEq, Eq, Clone, Hash, PartialOrd, Ord, Copy)]
#[non_exhaustive]
pub struct SubdivisionId {
/// A region field of a Subdivision Id.
pub region: Region,
/// A subdivision suffix field of a Subdivision Id.
pub suffix: SubdivisionSuffix,
}
impl SubdivisionId {
/// Returns a new [`SubdivisionId`].
///
/// # Examples
///
/// ```
/// use icu::locale::{
/// subtags::region,
/// extensions::unicode::{subdivision_suffix, SubdivisionId}
/// };
///
/// let ss = subdivision_suffix!("zzzz");
/// let region = region!("gb");
///
/// let si = SubdivisionId::new(region, ss);
///
/// assert_eq!(si.to_string(), "gbzzzz");
/// ```
pub const fn new(region: Region, suffix: SubdivisionSuffix) -> Self {
Self { region, suffix }
}
/// A constructor which takes a str slice, parses it and
/// produces a well-formed [`SubdivisionId`].
#[inline]
pub fn try_from_str(s: &str) -> Result<Self, ParseError> {
Self::try_from_utf8(s.as_bytes())
}
/// See [`Self::try_from_str`]
pub fn try_from_utf8(code_units: &[u8]) -> Result<Self, ParseError> {
let is_alpha = code_units
.first()
.and_then(|b| {
b.is_ascii_alphabetic()
.then_some(true)
.or_else(|| b.is_ascii_digit().then_some(false))
})
.ok_or(ParseError::InvalidExtension)?;
let region_len = if is_alpha { 2 } else { 3 };
if code_units.len() < region_len + 1 {
return Err(ParseError::InvalidExtension);
}
let (region_code_units, suffix_code_units) = code_units.split_at(region_len);
let region =
Region::try_from_utf8(region_code_units).map_err(|_| ParseError::InvalidExtension)?;
let suffix = SubdivisionSuffix::try_from_utf8(suffix_code_units)?;
Ok(Self { region, suffix })
}
/// Convert to [`Subtag`]
pub fn into_subtag(self) -> Subtag {
let result = self.region.to_tinystr().concat(self.suffix.to_tinystr());
Subtag::from_tinystr_unvalidated(result)
}
}
impl writeable::Writeable for SubdivisionId {
#[inline]
fn write_to<W: core::fmt::Write + ?Sized>(&self, sink: &mut W) -> core::fmt::Result {
sink.write_str(self.region.to_tinystr().to_ascii_lowercase().as_str())?;
sink.write_str(self.suffix.as_str())
}
#[inline]
fn writeable_length_hint(&self) -> writeable::LengthHint {
self.region.writeable_length_hint() + self.suffix.writeable_length_hint()
}
}
writeable::impl_display_with_writeable!(SubdivisionId);
impl FromStr for SubdivisionId {
type Err = ParseError;
#[inline]
fn from_str(s: &str) -> Result<Self, Self::Err> {
Self::try_from_str(s)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_subdivisionid_fromstr() {
let si: SubdivisionId = "gbzzzz".parse().expect("Failed to parse SubdivisionId");
assert_eq!(si.region.to_string(), "GB");
assert_eq!(si.suffix.to_string(), "zzzz");
assert_eq!(si.to_string(), "gbzzzz");
for sample in ["", "gb", "o"] {
let oe: Result<SubdivisionId, _> = sample.parse();
assert!(oe.is_err(), "Should fail: {}", sample);
}
}
}