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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 ).
//! 🚧 \[Experimental\] Types to hold user preferences to configure a DateTimeFormatter.
//!
//! ✨ *Enabled with the `experimental` Cargo feature.*
//!
//! Preferences is a bag of options to be associated with either [`length::Bag`] or [`components::Bag`]
//! which provides information on user preferences that can affect the result of the formatting.
//!
//! [`length::Bag`]: crate::options::length::Bag
//! [`components::Bag`]: crate::options::components::Bag
//!
//! <div class="stab unstable">
//! 🚧 This code is experimental; it may change at any time, in breaking or non-breaking ways,
//! including in SemVer minor releases. It can be enabled with the "experimental" Cargo feature
//! of the icu meta-crate. Use with caution.
//! <a href="https://github.com/unicode-org/icu4x/issues/1317">#1317</a>
//! </div>
//!
//! # Unicode Extensions
//! User preferences will often be stored as part of the [`Locale`] identified as `Unicode Extensions`, but
//! for scenarios where the application stores information about user preferences they can be also provided via
//! this bag (and if they are, they will take precedence over unicode extensions from the locale).
//!
//! [`Locale`]: icu_locid::Locale
//!
//! # Examples
//!
//! ```
//! use icu::datetime::options::preferences;
//!
//! let prefs = preferences::Bag::from_hour_cycle(preferences::HourCycle::H23);
//! ```
use crate::fields;
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
use icu_locid::extensions::unicode::key;
use icu_provider::DataLocale;
use tinystr::tinystr;
use tinystr::TinyAsciiStr;
/// Stores user preferences which may affect the result of date and time formatting.
///
/// <div class="stab unstable">
/// 🚧 This code is experimental; it may change at any time, in breaking or non-breaking ways,
/// including in SemVer minor releases. It can be enabled with the "experimental" Cargo feature
/// of the icu meta-crate. Use with caution.
/// <a href="https://github.com/unicode-org/icu4x/issues/1317">#1317</a>
/// </div>
///
/// # Examples
///
/// ```
/// use icu::datetime::options::preferences;
///
/// let prefs = preferences::Bag::from_hour_cycle(preferences::HourCycle::H23);
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[non_exhaustive]
pub struct Bag {
/// The hour cycle can be adjusts according to user preferences, for instance at the OS-level.
/// That preference can be applied here to change the hour cycle from the default for the
/// given locale.
#[cfg_attr(feature = "serde", serde(rename = "hourCycle"))]
pub hour_cycle: Option<HourCycle>,
}
impl Bag {
/// Construct a [`Bag`] with a given [`HourCycle`]
#[cfg(feature = "experimental")]
pub fn from_hour_cycle(h: HourCycle) -> Self {
Self {
hour_cycle: Some(h),
}
}
/// Construct a [`Bag`] from a given [`DataLocale`]
pub(crate) fn from_data_locale(data_locale: &DataLocale) -> Self {
const H11: TinyAsciiStr<8> = tinystr!(8, "h11");
const H12: TinyAsciiStr<8> = tinystr!(8, "h12");
const H23: TinyAsciiStr<8> = tinystr!(8, "h23");
const H24: TinyAsciiStr<8> = tinystr!(8, "h24");
let hour_cycle = match data_locale
.get_unicode_ext(&key!("hc"))
.and_then(|v| v.as_single_subtag().copied())
{
Some(H11) => Some(HourCycle::H11),
Some(H12) => Some(HourCycle::H12),
Some(H23) => Some(HourCycle::H23),
Some(H24) => Some(HourCycle::H24),
_ => None,
};
Self { hour_cycle }
}
}
/// A user preference for adjusting how the hour component is displayed.
///
/// <div class="stab unstable">
/// 🚧 This code is experimental; it may change at any time, in breaking or non-breaking ways,
/// including in SemVer minor releases. It can be enabled with the "experimental" Cargo feature
/// of the icu meta-crate. Use with caution.
/// <a href="https://github.com/unicode-org/icu4x/issues/1317">#1317</a>
/// </div>
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[allow(clippy::exhaustive_enums)] // this type is stable
pub enum HourCycle {
/// Hour is formatted to be in range 1-24 where midnight is 24:00.
///
/// # Examples
///
/// ```
/// "24:12";
/// "8:23";
/// "19:00";
/// "23:21";
/// ```
#[cfg_attr(feature = "serde", serde(rename = "h24"))]
H24,
/// Hour is formatted to be in range 0-23 where midnight is 00:00.
///
/// # Examples
///
/// ```
/// "0:12";
/// "8:23";
/// "19:00";
/// "23:21";
/// ```
#[cfg_attr(feature = "serde", serde(rename = "h23"))]
H23,
/// Hour is formatted to be in range 1-12 where midnight is 12:00.
///
/// # Examples
///
/// ```
/// "1:12";
/// "8:23";
/// "7:00";
/// "11:21";
/// ```
#[cfg_attr(feature = "serde", serde(rename = "h12"))]
H12,
/// Hour is formatted to be in range 0-11 where midnight is 00:00.
///
/// # Examples
///
/// ```
/// "0:12";
/// "8:23";
/// "7:00";
/// "11:21";
/// ```
#[cfg_attr(feature = "serde", serde(rename = "h11"))]
H11,
}
impl HourCycle {
/// Convert the HourCycle preference to a field.
pub fn field(self) -> fields::Hour {
match self {
Self::H11 => fields::Hour::H11,
Self::H12 => fields::Hour::H12,
Self::H23 => fields::Hour::H23,
Self::H24 => fields::Hour::H24,
}
}
}