function configFromArray()

in charts/shared/moment.js [2585:2672]
63 lines of code
24 McCabe index (conditional complexity)

function configFromArray(config) {
    var i,
        date,
        input = [],
        currentDate,
        expectedWeekday,
        yearToUse;

    if (config._d) {
        return;
    }

    currentDate = currentDateArray(config);

    //compute day of the year from weeks and weekdays
    if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
        dayOfYearFromWeekInfo(config);
    }

    //if the day of the year is set, figure out what it is
    if (config._dayOfYear != null) {
        yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

        if (
            config._dayOfYear > daysInYear(yearToUse) ||
            config._dayOfYear === 0
        ) {
            getParsingFlags(config)._overflowDayOfYear = true;
        }

        date = createUTCDate(yearToUse, 0, config._dayOfYear);
        config._a[MONTH] = date.getUTCMonth();
        config._a[DATE] = date.getUTCDate();
    }

    // Default to current date.
    // * if no year, month, day of month are given, default to today
    // * if day of month is given, default month and year
    // * if month is given, default only year
    // * if year is given, don't default anything
    for (i = 0; i < 3 && config._a[i] == null; ++i) {
        config._a[i] = input[i] = currentDate[i];
    }

    // Zero out whatever was not defaulted, including time
    for (; i < 7; i++) {
        config._a[i] = input[i] =
            config._a[i] == null ? (i === 2 ? 1 : 0) : config._a[i];
    }

    // Check for 24:00:00.000
    if (
        config._a[HOUR] === 24 &&
        config._a[MINUTE] === 0 &&
        config._a[SECOND] === 0 &&
        config._a[MILLISECOND] === 0
    ) {
        config._nextDay = true;
        config._a[HOUR] = 0;
    }

    config._d = (config._useUTC ? createUTCDate : createDate).apply(
        null,
        input
    );
    expectedWeekday = config._useUTC
        ? config._d.getUTCDay()
        : config._d.getDay();

    // Apply timezone offset from input. The actual utcOffset can be changed
    // with parseZone.
    if (config._tzm != null) {
        config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
    }

    if (config._nextDay) {
        config._a[HOUR] = 24;
    }

    // check for mismatching day of week
    if (
        config._w &&
        typeof config._w.d !== 'undefined' &&
        config._w.d !== expectedWeekday
    ) {
        getParsingFlags(config).weekdayMismatch = true;
    }
}