icu_calendar 1.1.0

// 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 ).

//! Types for dealing with dates, times, and custom calendars.
//!
//! This module is published as its own crate ([`icu_calendar`](https://docs.rs/icu_calendar/latest/icu_calendar/))
//! and as part of the [`icu`](https://docs.rs/icu/latest/icu/) crate. See the latter for more details on the ICU4X project.
//! The [`types`] module has a lot of common types for dealing with dates and times.
//!
//! [`Calendar`] is a trait that allows one to define custom calendars, and [`Date`]
//! can represent dates for arbitrary calendars.
//!
//! The [`iso`] and [`gregorian`] modules contain implementations for the ISO and
//! Gregorian calendars respectively. Further calendars can be found in modules like
//! [`japanese`], [`julian`], [`coptic`], [`indian`], [`buddhist`], and [`ethiopian`].
//!
//! Most interaction with this crate will be done via the [`Date`] and [`DateTime`] types.
//!
//! Some of the algorithms implemented here are based on
//! Dershowitz, Nachum, and Edward M. Reingold. _Calendrical calculations_. Cambridge University Press, 2008.
//! with associated Lisp code found at <https://github.com/EdReingold/calendar-code2>.
//!
//! # Examples
//!
//! Examples of date manipulation using `Date` object. `Date` objects are useful
//! for working with dates, encompassing information about the day, month, year,
//! as well as the calendar type.
//!
//! ```rust
//! use icu::calendar::{types::IsoWeekday, Date};
//!
//! // Creating ISO date: 1992-09-02.
//! let mut date_iso = Date::try_new_iso_date(1992, 9, 2)
//!     .expect("Failed to initialize ISO Date instance.");
//!
//! assert_eq!(date_iso.day_of_week(), IsoWeekday::Wednesday);
//! assert_eq!(date_iso.year().number, 1992);
//! assert_eq!(date_iso.month().ordinal, 9);
//! assert_eq!(date_iso.day_of_month().0, 2);
//!
//! // Answering questions about days in month and year.
//! assert_eq!(date_iso.days_in_year(), 366);
//! assert_eq!(date_iso.days_in_month(), 30);
//! ```
//!
//! Example of converting an ISO date across Indian and Buddhist calendars.
//!
//! ```rust
//! use icu::calendar::{buddhist::Buddhist, indian::Indian, Date};
//!
//! // Creating ISO date: 1992-09-02.
//! let mut date_iso = Date::try_new_iso_date(1992, 9, 2)
//!     .expect("Failed to initialize ISO Date instance.");
//!
//! assert_eq!(date_iso.year().number, 1992);
//! assert_eq!(date_iso.month().ordinal, 9);
//! assert_eq!(date_iso.day_of_month().0, 2);
//!
//! // Conversion into Indian calendar: 1914-08-02.
//! let date_indian = date_iso.to_calendar(Indian);
//! assert_eq!(date_indian.year().number, 1914);
//! assert_eq!(date_indian.month().ordinal, 6);
//! assert_eq!(date_indian.day_of_month().0, 11);
//!
//! // Conversion into Buddhist calendar: 2535-09-02.
//! let date_buddhist = date_iso.to_calendar(Buddhist);
//! assert_eq!(date_buddhist.year().number, 2535);
//! assert_eq!(date_buddhist.month().ordinal, 9);
//! assert_eq!(date_buddhist.day_of_month().0, 2);
//! ```
//!
//! Example using `DateTime` object. Similar to `Date` objects, `DateTime` objects
//! contain an accessible `Date` object containing information about the day, month,
//! year, and calendar type. Additionally, `DateTime` objects contain an accessible
//! `Time` object, including granularity of hour, minute, second, and nanosecond.
//!
//! ```rust
//! use icu::calendar::{types::IsoWeekday, types::Time, DateTime};
//!
//! // Creating ISO date: 1992-09-02 8:59
//! let mut datetime_iso = DateTime::try_new_iso_datetime(1992, 9, 2, 8, 59, 0)
//!     .expect("Failed to initialize ISO DateTime instance.");
//!
//! assert_eq!(datetime_iso.date.day_of_week(), IsoWeekday::Wednesday);
//! assert_eq!(datetime_iso.date.year().number, 1992);
//! assert_eq!(datetime_iso.date.month().ordinal, 9);
//! assert_eq!(datetime_iso.date.day_of_month().0, 2);
//! assert_eq!(datetime_iso.time.hour.number(), 8);
//! assert_eq!(datetime_iso.time.minute.number(), 59);
//! assert_eq!(datetime_iso.time.second.number(), 0);
//! assert_eq!(datetime_iso.time.nanosecond.number(), 0);
//! ```
//! [`ICU4X`]: ../icu/index.html

// https://github.com/unicode-org/icu4x/blob/main/docs/process/boilerplate.md#library-annotations
#![cfg_attr(not(any(test, feature = "std")), no_std)]
#![cfg_attr(
    not(test),
    deny(
        clippy::indexing_slicing,
        clippy::unwrap_used,
        clippy::expect_used,
        clippy::panic,
        clippy::exhaustive_structs,
        clippy::exhaustive_enums,
        // TODO(#2266): enable missing_debug_implementations,
    )
)]
#![warn(missing_docs)]

extern crate alloc;

// Make sure inherent docs go first
mod date;
mod datetime;

pub mod any_calendar;
pub mod buddhist;
mod calendar;
mod calendar_arithmetic;
pub mod coptic;
mod duration;
mod error;
pub mod ethiopian;
pub mod gregorian;
mod helpers;
pub mod indian;
pub mod iso;
pub mod japanese;
pub mod julian;
pub mod provider;
pub mod types;
mod week_of;

pub mod week {
    //! Functions for week-of-month and week-of-year arithmetic.
    use crate::week_of;
    pub use week_of::RelativeUnit;
    pub use week_of::WeekCalculator;
    pub use week_of::WeekOf;
}

pub use any_calendar::{AnyCalendar, AnyCalendarKind};
pub use calendar::Calendar;
pub use date::{AsCalendar, Date, Ref};
pub use datetime::DateTime;
#[doc(hidden)]
pub use duration::{DateDuration, DateDurationUnit};
pub use error::CalendarError;
pub use gregorian::Gregorian;
pub use iso::Iso;

/// Re-export of [`CalendarError`].
#[doc(no_inline)]
pub use CalendarError as Error;