Trait IslamicBasedMarker

pub trait IslamicBasedMarker {
    const EPOCH: RataDie;
    const DEBUG_NAME: &'static str;
    const HAS_353_DAY_YEARS: bool;

    // Required methods
    fn fixed_from_islamic(year: i32, month: u8, day: u8) -> RataDie;
    fn islamic_from_fixed(date: RataDie) -> (i32, u8, u8);

    // Provided methods
    fn mean_synodic_ny(extended_year: i32) -> RataDie { ... }
    fn approximate_islamic_from_fixed(date: RataDie) -> i32 { ... }
    fn month_lengths_for_year(extended_year: i32, ny: RataDie) -> [bool; 12] { ... }
}

Common abstraction over islamic-style calendars

Required Associated Constants

const EPOCH: RataDie

The epoch of the calendar. Different calendars use a different epoch (Thu or Fri) due to disagreement on the exact date of Mohammed’s migration to Mecca.

const DEBUG_NAME: &'static str

The name of the calendar for debugging.

const HAS_353_DAY_YEARS: bool

Whether this calendar is known to have 353-day years. This is probably a bug; see https://github.com/unicode-org/icu4x/issues/4930

Required Methods

fn fixed_from_islamic(year: i32, month: u8, day: u8) -> RataDie

Convert an islamic date in this calendar to a R.D.

fn islamic_from_fixed(date: RataDie) -> (i32, u8, u8)

Convert an R.D. To an islamic date in this calendar

Provided Methods

fn mean_synodic_ny(extended_year: i32) -> RataDie

Given the extended year, calculate the approximate new year using the mean synodic month

fn approximate_islamic_from_fixed(date: RataDie) -> i32

Given an iso date, calculate the approximate islamic year it corresponds to (for quick cache lookup)

fn month_lengths_for_year(extended_year: i32, ny: RataDie) -> [bool; 12]

Given an extended year, calculate whether each month is 29 or 30 days long

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl IslamicBasedMarker for CivilIslamicMarker

const EPOCH: RataDie = FIXED_ISLAMIC_EPOCH_FRIDAY

const DEBUG_NAME: &'static str = "CivilIslamic"

const HAS_353_DAY_YEARS: bool = false

impl IslamicBasedMarker for ObservationalIslamicMarker

const EPOCH: RataDie = FIXED_ISLAMIC_EPOCH_FRIDAY

const DEBUG_NAME: &'static str = "ObservationalIslamic"

const HAS_353_DAY_YEARS: bool = true

impl IslamicBasedMarker for SaudiIslamicMarker

const EPOCH: RataDie = FIXED_ISLAMIC_EPOCH_FRIDAY

const DEBUG_NAME: &'static str = "SaudiIslamic"

const HAS_353_DAY_YEARS: bool = true

impl IslamicBasedMarker for TabularIslamicMarker

const EPOCH: RataDie = FIXED_ISLAMIC_EPOCH_THURSDAY

const DEBUG_NAME: &'static str = "TabularIslamic"

const HAS_353_DAY_YEARS: bool = false