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<?php |
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namespace Popy\Calendar\Converter\UnixTimeConverter; |
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use Popy\Calendar\Converter\Conversion; |
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use Popy\Calendar\Converter\UnixTimeConverterInterface; |
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use Popy\Calendar\Converter\CompleteLeapYearCalculatorInterface; |
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use Popy\Calendar\ValueObject\DateSolarRepresentationInterface; |
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use Popy\Calendar\ValueObject\DateFragmentedRepresentationInterface; |
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/** |
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* Implementation of the standard (gregorian like) month calculation. |
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*/ |
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class Iso8601Weeks implements UnixTimeConverterInterface |
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{ |
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/** |
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* Leap year calculator. |
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* |
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* @var CompleteLeapYearCalculatorInterface |
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*/ |
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protected $calculator; |
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/** |
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* First day of first year weekday index. 1970 started a thursday. |
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* |
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* @var integer |
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*/ |
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protected $firstYearDayIndex = 3; |
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/** |
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* Class constructor. |
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* |
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* @param CompleteLeapYearCalculatorInterface $calculator Leap year calculator. |
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* @param integer|null $firstYearDayIndex First day of first year weekday index. |
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*/ |
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public function __construct(CompleteLeapYearCalculatorInterface $calculator, $firstYearDayIndex = null) |
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{ |
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$this->calculator = $calculator; |
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if (null !== $firstYearDayIndex) { |
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$this->firstYearDayIndex = $firstYearDayIndex; |
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} |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function fromUnixTime(Conversion $conversion) |
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{ |
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$input = $conversion->getTo(); |
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if ( |
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!$input instanceof DateFragmentedRepresentationInterface |
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|| !$input instanceof DateSolarRepresentationInterface |
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) { |
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return; |
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} |
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$year = (int)$input->getYear(); |
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// Assuming the era starting year is 1970, it starts a Thursday. |
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$dayOfWeek = ($input->getEraDayIndex() + $this->firstYearDayIndex) % 7; |
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// dayOfWeek may be negative is eraDayIndex was negative |
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if ($dayOfWeek < 0) { |
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$dayOfWeek += 7; |
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} |
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$weekIndex = null; |
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// Get day yearl-index of the same week thursday |
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$thursdayIndex = $input->getDayIndex() + 3 - $dayOfWeek; |
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if ($thursdayIndex >= $this->calculator->getYearLength($year)) { |
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$year++; |
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$weekIndex = 0; |
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$thursdayIndex -= $this->calculator->getYearLength($year); |
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} else { |
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if ($thursdayIndex < 0) { |
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$year--; |
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$thursdayIndex = |
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$this->calculator->getYearLength($year) |
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+ $thursdayIndex |
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; |
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} |
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$weekIndex = intval($thursdayIndex / 7); |
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} |
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$dateParts = $input->getDateParts()->withTransversals([ |
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$year, |
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$weekIndex, |
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$dayOfWeek |
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]); |
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$conversion->setTo($input->withDateParts($dateParts)); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function toUnixTime(Conversion $conversion) |
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{ |
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$input = $conversion->getTo(); |
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if ( |
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!$input instanceof DateFragmentedRepresentationInterface |
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|| !$input instanceof DateSolarRepresentationInterface |
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) { |
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return; |
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} |
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if (null !== $input->getDayIndex() && null !== $input->getYear()) { |
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return ; |
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} |
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$year = $input->getDateParts()->getTransversal(0); |
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$weekIndex = $input->getDateParts()->getTransversal(1); |
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$dayOfWeek = $input->getDateParts()->getTransversal(2); |
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if (null === $year || null === $weekIndex) { |
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// Too imprecise to be worth |
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return; |
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} |
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$startingEraDayIndex = $this->calculator->getYearEraDayIndex($year); |
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// DoW of the first day of year |
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$dow = ($startingEraDayIndex + $this->firstYearDayIndex) % 7; |
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// walk until first thursday |
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$eraDayIndex = $startingEraDayIndex + (10 - $dow) % 7; |
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// Now eraDayIndex points on the thursday of the week #0. Lets go to the |
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// weekIndex, and move to the dayOfWeek |
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$eraDayIndex += $weekIndex * 7 + $dayOfWeek - 3; |
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$dayIndex = $eraDayIndex - $startingEraDayIndex; |
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if ($dayIndex < 0) { |
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$year--; |
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$eraDayIndex += $this->calculator->getYearLength($year); |
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$dayIndex = $eraDayIndex - $startingEraDayIndex; |
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} else { |
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$yl = $this->calculator->getYearLength($year); |
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if ($dayIndex >= $yl) { |
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$year++; |
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$dayIndex -= $yl; |
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$eraDayIndex += $yl; |
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} |
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} |
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$isLeapYear = $this->calculator->isLeapYear($year); |
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$input = $input |
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->withYear($year, $isLeapYear) |
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->withDayIndex($dayIndex, $eraDayIndex) |
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; |
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$conversion->setTo($input); |
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} |
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} |
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popy-dev /
popy-calendar
