@hebcal/core/dist/src/hallel.js

A perpetual Jewish Calendar API

import { months } from '@hebcal/hdate';
import { flags } from './event';
const NONE = 0;
const HALF = 1;
const WHOLE = 2;
/**
 * @private
 */
export function hallel_(events, hdate) {
    const whole = events
        .filter(ev => {
        const desc = ev.getDesc();
        const hd = ev.getDate();
        const month = hd.getMonth();
        const mday = hd.getDate();
        return (desc.startsWith('Chanukah') ||
            desc.startsWith('Shavuot') ||
            desc.startsWith('Sukkot') ||
            (month === months.NISAN &&
                (mday === 15 || mday === 16) &&
                ev.getFlags() & flags.CHAG) || // Pesach
            desc === "Yom HaAtzma'ut" ||
            desc === 'Yom Yerushalayim');
    })
        .map(ev => {
        return ev.getDate().abs();
    });
    const abs = hdate.abs();
    if (whole.includes(abs)) {
        return WHOLE;
    }
    const half = events
        .filter(ev => {
        const desc = ev.getDesc();
        return (ev.getFlags() & flags.ROSH_CHODESH ||
            (desc.startsWith('Pesach') &&
                desc !== 'Pesach I' &&
                desc !== 'Pesach II'));
    })
        .map(ev => {
        return ev.getDate().abs();
    });
    if (half.includes(abs)) {
        return HALF;
    }
    return NONE;
}