Week.php

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<?php
 
namespace PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
 
use DateTime;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDateHelper;
 
class Week
{
    public static function number($dateValue, $method = Constants::STARTWEEK_SUNDAY)
    {
        $origDateValueNull = empty($dateValue);
 
        try {
            $method = self::validateMethod($method);
            if ($dateValue === null) { // boolean not allowed
                $dateValue = (SharedDateHelper::getExcelCalendar() === SharedDateHelper::CALENDAR_MAC_1904 || $method === Constants::DOW_SUNDAY) ? 0 : 1;
            }
            $dateValue = self::validateDateValue($dateValue);
            if (!$dateValue && self::buggyWeekNum1900($method)) {
                // This seems to be an additional Excel bug.
                return 0;
            }
        } catch (Exception $e) {
            return $e->getMessage();
        }
 
        // Execute function
        $PHPDateObject = SharedDateHelper::excelToDateTimeObject($dateValue);
        if ($method == Constants::STARTWEEK_MONDAY_ISO) {
            Helpers::silly1900($PHPDateObject);
 
            return (int) $PHPDateObject->format('W');
        }
        if (self::buggyWeekNum1904($method, $origDateValueNull, $PHPDateObject)) {
            return 0;
        }
        Helpers::silly1900($PHPDateObject, '+ 5 years'); // 1905 calendar matches
        $dayOfYear = (int) $PHPDateObject->format('z');
        $PHPDateObject->modify('-' . $dayOfYear . ' days');
        $firstDayOfFirstWeek = (int) $PHPDateObject->format('w');
        $daysInFirstWeek = (6 - $firstDayOfFirstWeek + $method) % 7;
        $daysInFirstWeek += 7 * !$daysInFirstWeek;
        $endFirstWeek = $daysInFirstWeek - 1;
        $weekOfYear = floor(($dayOfYear - $endFirstWeek + 13) / 7);
 
        return (int) $weekOfYear;
    }
 
    public static function isoWeekNumber($dateValue)
    {
        if (self::apparentBug($dateValue)) {
            return 52;
        }
 
        try {
            $dateValue = Helpers::getDateValue($dateValue);
        } catch (Exception $e) {
            return $e->getMessage();
        }
 
        // Execute function
        $PHPDateObject = SharedDateHelper::excelToDateTimeObject($dateValue);
        Helpers::silly1900($PHPDateObject);
 
        return (int) $PHPDateObject->format('W');
    }
 
    public static function day($dateValue, $style = 1)
    {
        try {
            $dateValue = Helpers::getDateValue($dateValue);
            $style = self::validateStyle($style);
        } catch (Exception $e) {
            return $e->getMessage();
        }
 
        // Execute function
        $PHPDateObject = SharedDateHelper::excelToDateTimeObject($dateValue);
        Helpers::silly1900($PHPDateObject);
        $DoW = (int) $PHPDateObject->format('w');
 
        switch ($style) {
            case 1:
                ++$DoW;
 
                break;
            case 2:
                $DoW = self::dow0Becomes7($DoW);
 
                break;
            case 3:
                $DoW = self::dow0Becomes7($DoW) - 1;
 
                break;
        }
 
        return $DoW;
    }
 
    private static function validateStyle($style): int
    {
        $style = Functions::flattenSingleValue($style);
 
        if (!is_numeric($style)) {
            throw new Exception(Functions::VALUE());
        }
        $style = (int) $style;
        if (($style < 1) || ($style > 3)) {
            throw new Exception(Functions::NAN());
        }
 
        return $style;
    }
 
    private static function dow0Becomes7(int $DoW): int
    {
        return ($DoW === 0) ? 7 : $DoW;
    }
 
    private static function apparentBug($dateValue): bool
    {
        if (SharedDateHelper::getExcelCalendar() !== SharedDateHelper::CALENDAR_MAC_1904) {
            if (is_bool($dateValue)) {
                return true;
            }
            if (is_numeric($dateValue) && !((int) $dateValue)) {
                return true;
            }
        }
 
        return false;
    }
 
    private static function validateDateValue($dateValue): float
    {
        if (is_bool($dateValue)) {
            throw new Exception(Functions::VALUE());
        }
 
        return Helpers::getDateValue($dateValue);
    }
 
    private static function validateMethod($method): int
    {
        if ($method === null) {
            $method = Constants::STARTWEEK_SUNDAY;
        }
        $method = Functions::flattenSingleValue($method);
        if (!is_numeric($method)) {
            throw new Exception(Functions::VALUE());
        }
 
        $method = (int) $method;
        if (!array_key_exists($method, Constants::METHODARR)) {
            throw new Exception(Functions::NAN());
        }
        $method = Constants::METHODARR[$method];
 
        return $method;
    }
 
    private static function buggyWeekNum1900(int $method): bool
    {
        return $method === Constants::DOW_SUNDAY && SharedDateHelper::getExcelCalendar() === SharedDateHelper::CALENDAR_WINDOWS_1900;
    }
 
    private static function buggyWeekNum1904(int $method, bool $origNull, DateTime $dateObject): bool
    {
        // This appears to be another Excel bug.
 
        return $method === Constants::DOW_SUNDAY && SharedDateHelper::getExcelCalendar() === SharedDateHelper::CALENDAR_MAC_1904 &&
            !$origNull && $dateObject->format('Y-m-d') === '1904-01-01';
    }
}