poland-public-holidays/build/helpers.js

compute dates of public holidays in Poland

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.validateDate = exports.validateYear = exports.isNumber = exports.getEasterDate = exports.isSameDay = exports.addDays = void 0;
function addDays(date, days) {
    const result = new Date(date);
    result.setDate(result.getDate() + days);
    return result;
}
exports.addDays = addDays;
function isSameDay(date1, date2) {
    return (date1.getFullYear() === date2.getFullYear() &&
        date1.getMonth() === date2.getMonth() &&
        date1.getDate() === date2.getDate());
}
exports.isSameDay = isSameDay;
function getEasterDate(yearInput) {
    // https://en.wikipedia.org/wiki/Date_of_Easter#Anonymous_Gregorian_algorithm
    const a = yearInput % 19;
    const b = Math.floor(yearInput / 100);
    const c = yearInput % 100;
    const d = Math.floor(b / 4);
    const e = b % 4;
    const f = Math.floor((b + 8) / 25);
    const g = Math.floor((b - f + 1) / 3);
    const h = (19 * a + b - d - g + 15) % 30;
    const i = Math.floor(c / 4);
    const k = c % 4;
    const l = (32 + 2 * e + 2 * i - h - k) % 7;
    const m = Math.floor((a + 11 * h + 22 * l) / 451);
    const p = h + l - 7 * m + 114;
    const pad = (n) => (n + '').padStart(2, '0');
    const day = pad((p % 31) + 1);
    const month = pad(Math.floor(p / 31));
    const year = yearInput.toString().padStart(4, '0');
    return new Date(`${year}-${month}-${day}`);
}
exports.getEasterDate = getEasterDate;
function isNumber(value) {
    return typeof value === 'number' && isFinite(value);
}
exports.isNumber = isNumber;
function validateYear(year) {
    if (isNumber(year) && year > 0) {
        return validateYear(new Date(year.toString().padStart(4, '0')));
    }
    try {
        return validateDate(year);
    }
    catch (error) {
        throw new Error(`Invalid year`);
    }
}
exports.validateYear = validateYear;
function validateDate(date) {
    let dateObject;
    if (date instanceof Date) {
        dateObject = date;
    }
    else if (typeof date === 'string') {
        dateObject = new Date(date);
    }
    if (dateObject !== undefined && dateObject.toString() !== 'Invalid Date') {
        return dateObject;
    }
    else {
        throw new Error(`Invalid date`);
    }
}
exports.validateDate = validateDate;
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