web-ui-pack/helpers/dateFromString.js

Web package with UI elements

import localeInfo from "../objects/localeInfo";
export default function dateFromString(v, format = "YYYY-MM-DD", options = { throwOutOfRange: true }) {
    if (!v) {
        return null;
    }
    format = format.replace(/MMM/, () => {
        localeInfo.namesMonthShort.some((name, i) => {
            let isFound = false;
            v = v.replace(name, () => {
                isFound = true;
                return (i + 1).toString();
            });
            return isFound;
        });
        return "M";
    });
    let fLast = format.length - 1;
    const isUTC = format.endsWith("Z") || format.endsWith("z");
    fLast -= isUTC ? 1 : 0;
    const h12 = format[fLast] === "a" || format[fLast] === "A";
    let vLast = v.length - 1;
    if (h12) {
        fLast -= 1;
        vLast -= 2;
    }
    const r = { y: 0, M: 0, d: 0, h: 0, m: 0, s: 0, f: 0 };
    let vi = 0;
    let yCnt = 0;
    for (let fi = 0; vi <= vLast; ++vi, ++fi) {
        let char = format[fi];
        switch (char) {
            case "Y":
                char = "y";
                break;
            case "D":
                char = "d";
                break;
            case "H":
                char = "h";
                break;
            case "S":
                char = "s";
                break;
            case "F":
                char = "f";
                break;
            default: break;
        }
        const num = v.charCodeAt(vi) - 48;
        const isNum = num >= 0 && num <= 9;
        const key = char;
        if (isNum) {
            if (r[key] !== undefined) {
                r[key] = r[key] * 10 + num;
                if (key === "y") {
                    ++yCnt;
                }
            }
            else {
                fi -= 2;
                vi -= 1;
            }
        }
        else if (char !== v[vi]) {
            return null;
        }
    }
    if (h12) {
        const char = v[v.length - 2];
        if (char === "P" || char === "p") {
            r.h += r.h === 12 ? 0 : 12;
        }
        else if (char !== "A" && char !== "a") {
            return null;
        }
        else if (r.h === 12) {
            r.h = 0;
        }
    }
    if (yCnt === 2) {
        r.y += 2000;
    }
    --r.M;
    let dt;
    if (isUTC) {
        dt = new Date(Date.UTC(r.y, r.M, r.d, r.h, r.m, r.s, r.f));
    }
    else {
        dt = new Date(r.y, r.M, r.d, r.h, r.m, r.s, r.f);
    }
    const isOut = isOutOfRange(r, isUTC, dt);
    if (isOut && options.throwOutOfRange) {
        const err = RangeError("Out of range");
        err.details = { format, raw: v, options, parsed: r };
        console.warn(`${err.message}. Details:`, err.details);
        throw err;
    }
    else if (isOut) {
        return null;
    }
    return dt;
}
function isOutOfRange(r, isUTC, v) {
    return (r.M < 0 ||
        r.M > 11 ||
        r.d < 1 ||
        r.d > 31 ||
        r.h > 23 ||
        r.m > 59 ||
        r.s > 59 ||
        r.f > 999 ||
        (v && r.M !== v[`get${isUTC ? "UTC" : ""}Month`]()) ||
        false);
}