League\Period\Period

Complexity

Total Complexity

67

Size/Duplication

Total Lines	596
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Test Coverage

Coverage

100%

Importance

Changes

0

38 Methods

Rating	Name	Duplication	Size	Complexity
A	__set_state()	0	4	1
A	__construct()	0	10	2
A	getStartDate()	0	4	1
A	getEndDate()	0	4	1
A	getTimestampInterval()	0	4	1
A	getDateInterval()	0	4	1
A	getDatePeriod()	0	4	1
A	__toString()	0	6	1
A	jsonSerialize()	0	10	1
A	format()	0	4	1
A	durationCompare()	0	4	1
A	durationEquals()	0	4	1
A	durationGreaterThan()	0	4	1
A	durationLessThan()	0	4	1
A	equals()	0	5	2
A	abuts()	0	5	2
A	overlaps()	0	5	2
A	isAfter()	0	8	2
A	isBefore()	0	8	2
A	contains()	0	8	2
A	containsPeriod()	0	5	3
A	containsDatePoint()	0	4	2
A	split()	0	14	3
A	splitBackwards()	0	14	3
A	intersect()	0	11	4
A	diff()	0	21	4
A	gap()	0	12	3
A	startingOn()	0	9	2
A	endingOn()	0	9	2
A	withDurationAfterStart()	0	4	1
A	withDurationBeforeEnd()	0	4	1
A	moveStartDate()	0	4	1
A	moveEndDate()	0	4	1
A	move()	0	10	2
A	expand()	0	10	2
A	timestampIntervalDiff()	0	4	1
A	dateIntervalDiff()	0	4	1
A	merge()	0	16	4

<?php

/**
 * League.Period (https://period.thephpleague.com).
 *
 * @author  Ignace Nyamagana Butera <nyamsprod@gmail.com>
 * @license https://github.com/thephpleague/period/blob/master/LICENSE (MIT License)
 * @version 4.0.0
 * @link    https://github.com/thephpleague/period
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace League\Period;

use DateInterval;
use DatePeriod;
use DateTimeImmutable;
use DateTimeInterface;
use DateTimeZone;
use JsonSerializable;
use function array_unshift;
use function sprintf;

/**
 * A immutable value object class to manipulate Time interval.
 *
 * @package League.period
 * @author  Ignace Nyamagana Butera <nyamsprod@gmail.com>
 * @since   1.0.0
 */
final class Period implements JsonSerializable
{
    private const ISO8601_FORMAT = 'Y-m-d\TH:i:s.u\Z';

    /**
     * Period starting included datepoint.
     *
     * @var DateTimeImmutable
     */
    private $startDate;

    /**
     * Period ending excluded datepoint.
     *
     * @var DateTimeImmutable
     */
    private $endDate;

    /**
     * @inheritdoc
     */
    public static function __set_state(array $interval)
    {
        return new self($interval['startDate'], $interval['endDate']);
    }

    /**
     * Creates a new instance.
     *
     * @param mixed $startDate the interval start datepoint
     * @param mixed $endDate   the interval end datepoint
     *
     * @throws Exception If $startDate is greater than $endDate
     */
    public function __construct($startDate, $endDate)
    {
        $startDate = datepoint($startDate);
        $endDate = datepoint($endDate);
        if ($startDate > $endDate) {
            throw new Exception('The ending datepoint must be greater or equal to the starting datepoint');
        }
        $this->startDate = $startDate;
        $this->endDate = $endDate;
    }

    /**
     * Returns the Interval starting datepoint.
     *
     * The starting datepoint is included in the specified period.
     * The starting datepoint is always less than or equal to the ending datepoint.
     */
    public function getStartDate(): DateTimeImmutable
    {
        return $this->startDate;
    }

    /**
     * Returns the Interval ending datepoint.
     *
     * The ending datepoint is excluded from the specified period.
     * The ending datepoint is always greater than or equal to the starting datepoint.
     */
    public function getEndDate(): DateTimeImmutable
    {
        return $this->endDate;
    }

    /**
     * Returns the Interval duration as expressed in seconds.
     */
    public function getTimestampInterval(): float
    {
        return $this->endDate->getTimestamp() - $this->startDate->getTimestamp();
    }

    /**
     * Returns the Interval duration as a DateInterval object.
     */
    public function getDateInterval(): DateInterval
    {
        return $this->startDate->diff($this->endDate);
    }

    /**
     * Allows iteration over a set of dates and times,
     * recurring at regular intervals, over the instance.

     *
     * @see http://php.net/manual/en/dateperiod.construct.php
     */
    public function getDatePeriod($duration, int $option = 0): DatePeriod
    {
        return new DatePeriod($this->startDate, duration($duration), $this->endDate, $option);
    }

    /**
     * Returns the string representation as a ISO8601 interval format.
     *
     * @see https://en.wikipedia.org/wiki/ISO_8601#Time_intervals
     *
     * @return string
     */
    public function __toString()
    {
        $interval = $this->jsonSerialize();

        return $interval['startDate'].'/'.$interval['endDate'];
    }

    /**
     * Returns the Json representation of an instance using
     * the JSON representation of dates as returned by Javascript Date.toJSON() method.
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toJSON
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
     *
     * @return string[]
     */
    public function jsonSerialize()
    {
        static $utc;
        $utc = $utc ?? new DateTimeZone('UTC');

        return [
            'startDate' => $this->startDate->setTimezone($utc)->format(self::ISO8601_FORMAT),
            'endDate' => $this->endDate->setTimezone($utc)->format(self::ISO8601_FORMAT),
        ];
    }

    /**
     * Returns the mathematical represeation of an instance as a right open interval.
     *
     * @see https://en.wikipedia.org/wiki/Interval_(methematics)#Notations_for_intervals
     * @see https://php.net/manual/en/function.date.php for supported format string
     * @see https://www.postgresql.org/docs/9.3/static/rangetypes.html
     *
     * @param string $format the format of the outputted date string
     */
    public function format(string $format): string
    {
        return sprintf('[%s, %s)', $this->startDate->format($format), $this->endDate->format($format));
    }

    /**
     * Compares two instances according to their duration.
     *
     * Returns:
     * <ul>
     * <li> -1 if the current Interval is lesser than the submitted Interval object</li>
     * <li>  1 if the current Interval is greater than the submitted Interval object</li>
     * <li>  0 if both Interval objects have the same duration</li>
     * </ul>
     */
    public function durationCompare(self $interval): int
    {
        return $this->endDate <=> $this->startDate->add($interval->getDateInterval());
    }

    /**
     * Tells whether the current instance duration is equal to the submitted one.
     */
    public function durationEquals(self $interval): bool
    {
        return 0 === $this->durationCompare($interval);
    }

    /**
     * Tells whether the current instance duration is greater than the submitted one.
     */
    public function durationGreaterThan(self $interval): bool
    {
        return 1 === $this->durationCompare($interval);
    }

    /**
     * Tells whether the current instance duration is less than the submitted one.
     */
    public function durationLessThan(self $interval): bool
    {
        return -1 === $this->durationCompare($interval);
    }

    /**
     * Tells whether two intervals share the same datepoints.
     *
     * [--------------------)
     * [--------------------)
     */
    public function equals(self $interval): bool
    {
        return $this->startDate == $interval->startDate
            && $this->endDate == $interval->endDate;
    }

    /**
     * Tells whether two intervals abuts.
     *
     * [--------------------)
     *                      [--------------------)
     * or
     *                      [--------------------)
     * [--------------------)
     */
    public function abuts(self $interval): bool
    {
        return $this->startDate == $interval->endDate
            || $this->endDate == $interval->startDate;
    }

    /**
     * Tells whether two intervals overlaps.
     *
     * [--------------------)
     *          [--------------------)
     */
    public function overlaps(self $interval): bool
    {
        return $this->startDate < $interval->endDate
            && $this->endDate > $interval->startDate;
    }

    /**
     * Tells whether an interval is entirely after the specified index.
     * The index can be a DateTimeInterface object or another Period object.
     *
     *                          [--------------------)
     * [--------------------)
     */
    public function isAfter($index): bool
    {
        if ($index instanceof self) {
            return $this->startDate >= $index->endDate;
        }

        return $this->startDate > datepoint($index);
    }

    /**
     * Tells whether a Interval is entirely before the specified index.
     * The index can be a DateTimeInterface object or another Period object.
     *
     * [--------------------)
     *                          [--------------------)
     */
    public function isBefore($index): bool
    {
        if ($index instanceof self) {
            return $this->endDate <= $index->startDate;
        }

        return $this->endDate <= datepoint($index);
    }

    /**
     * Tells whether the specified index is fully contained within
     * the current Period object.
     */
    public function contains($index): bool
    {
        if ($index instanceof self) {
            return $this->containsPeriod($index);
        }

        return $this->containsDatePoint(datepoint($index));
    }

    /**
     * Tells whether the an interval is fully contained within the current instance.
     *
     * [--------------------)
     *     [----------)
     */
    private function containsPeriod(self $interval): bool
    {
        return $this->containsDatePoint($interval->startDate)
            && ($interval->endDate >= $this->startDate && $interval->endDate <= $this->endDate);
    }

    /**
     * Tells whether a datepoint is fully contained within the current instance.
     *
     * [------|------------)
     */
    private function containsDatePoint(DateTimeInterface $datepoint): bool
    {
        return $datepoint >= $this->startDate && $datepoint < $this->endDate;
    }

    /**
     * Allows splitting an instance in smaller Period objects according to a given interval.
     *
     * The returned iterable Interval set is ordered so that:
     * <ul>
     * <li>The first returned object MUST share the starting datepoint of the parent object.</li>
     * <li>The last returned object MUST share the ending datepoint of the parent object.</li>
     * <li>The last returned object MUST have a duration equal or lesser than the submitted interval.</li>
     * <li>All returned objects except for the first one MUST start immediately after the previously returned object</li>
     * </ul>
     *
     * @param DateInterval|Period|string|int $duration
     *
     * @return Period[]
     */
    public function split($duration): iterable
    {
        $startDate = $this->startDate;
        $duration = duration($duration);
        do {
            $endDate = $startDate->add($duration);
            if ($endDate > $this->endDate) {
                $endDate = $this->endDate;
            }
            yield new self($startDate, $endDate);

            $startDate = $endDate;
        } while ($startDate < $this->endDate);
    }

    /**
     * Allows splitting an instance in smaller Period objects according to a given interval.
     *
     * The returned iterable Period set is ordered so that:
     * <ul>
     * <li>The first returned object MUST share the ending datepoint of the parent object.</li>
     * <li>The last returned object MUST share the starting datepoint of the parent object.</li>
     * <li>The last returned object MUST have a duration equal or lesser than the submitted interval.</li>
     * <li>All returned objects except for the first one MUST end immediately before the previously returned object</li>
     * </ul>
     *
     * @param DateInterval|Period|string|int $duration
     *
     * @return Period[]
     */
    public function splitBackwards($duration): iterable
    {
        $endDate = $this->endDate;
        $duration = duration($duration);
        do {
            $startDate = $endDate->sub($duration);
            if ($startDate < $this->startDate) {
                $startDate = $this->startDate;
            }
            yield new self($startDate, $endDate);

            $endDate = $startDate;
        } while ($endDate > $this->startDate);
    }

    /**
     * Computes the intersection between two instances.
     *
     * [--------------------)
     *          ∩
     *                 [----------)
     *          =
     *                 [----)
     *
     * @throws Exception If both objects do not overlaps
     */
    public function intersect(self $interval): self
    {
        if (!$this->overlaps($interval)) {
            throw new Exception(sprintf('Both %s objects should overlaps', Period::class));
        }

        return new self(
            ($interval->startDate > $this->startDate) ? $interval->startDate : $this->startDate,
            ($interval->endDate < $this->endDate) ? $interval->endDate : $this->endDate
        );
    }

    /**
     * Computes the difference between two overlapsing instances.
     *
     * Returns an array containing the difference expressed as Period objects
     * The array will always contains 2 elements:
     *
     * <ul>
     * <li>an NULL filled array if both objects have the same datepoints</li>
     * <li>one Period object and NULL if both objects share one datepoint</li>
     * <li>two Period objects if both objects share no datepoint</li>
     * </ul>
     *
     * [--------------------)
     *          -
     *                [-----------)
     *          =
     * [--------------)  +  [-----)
     *
     * @throws Exception if both objects do not overlaps
     */
    public function diff(self $interval): array
    {
        if ($interval->equals($this)) {
            return [null, null];
        }

        $intersect = $this->intersect($interval);
        $merge = $this->merge($interval);
        if ($merge->startDate == $intersect->startDate) {
            return [$merge->startingOn($intersect->endDate), null];
        }

        if ($merge->endDate == $intersect->endDate) {
            return [$merge->endingOn($intersect->startDate), null];
        }

        return [
            $merge->endingOn($intersect->startDate),
            $merge->startingOn($intersect->endDate),
        ];
    }

    /**
     * Computes the gap between two instances.
     *
     * [--------------------)
     *          +
     *                          [----------)
     *          =
     *                      [---)
     *
     * @throws Exception If both objects overlaps
     */
    public function gap(self $interval): self
    {
        if ($this->overlaps($interval)) {
            throw new Exception(sprintf('Both %s objects should not overlaps', self::class));
        }

        if ($interval->startDate > $this->startDate) {
            return new self($this->endDate, $interval->startDate);
        }

        return new self($interval->endDate, $this->startDate);
    }

    /**
     * Returns an instance with the specified starting datepoint.
     *
     * This method MUST retain the state of the current instance, and return
     * an instance that contains the specified starting datepoint.
     *
     * @param DateTimeInterface|int|string $datepoint
     */
    public function startingOn($datepoint): self
    {
        $startDate = datepoint($datepoint);
        if ($startDate == $this->startDate) {
            return $this;
        }

        return new self($startDate, $this->endDate);
    }

    /**
     * Returns an instance with the specified ending datepoint.
     *
     * This method MUST retain the state of the current instance, and return
     * an instance that contains the specified ending datepoint.
     *
     * @param DateTimeInterface|int|string $datepoint
     */
    public function endingOn($datepoint): self
    {
        $endDate = datepoint($datepoint);
        if ($endDate == $this->endDate) {
            return $this;
        }

        return new self($this->startDate, $endDate);
    }

    /**
     * Returns a new instance with a new ending datepoint.
     *
     * @param DateInterval|Period|int|string $duration
     */
    public function withDurationAfterStart($duration): self
    {
        return $this->endingOn($this->startDate->add(duration($duration)));
    }

    /**
     * Returns a new instance with a new starting datepoint.
     *
     * @param DateInterval|Period|int|string $duration
     */
    public function withDurationBeforeEnd($duration): self
    {
        return $this->startingOn($this->endDate->sub(duration($duration)));
    }

    /**
     * Returns a new instance with a new starting datepoint
     * moved forward or backward by the given interval.
     *
     * @param DateInterval|Period|int|string $duration
     */
    public function moveStartDate($duration): self
    {
        return $this->startingOn($this->startDate->add(duration($duration)));
    }

    /**
     * Returns a new instance with a new ending datepoint
     * moved forward or backward by the given interval.
     *
     * @param DateInterval|Period|int|string $duration
     */
    public function moveEndDate($duration): self
    {
        return $this->endingOn($this->endDate->add(duration($duration)));
    }

    /**
     * Returns a new instance where the datepoints
     * are moved forwards or backward simultaneously by the given DateInterval.
     *
     * This method MUST retain the state of the current instance, and return
     * an instance that contains the specified new datepoints.
     *
     * @param DateInterval|Period|int|string $duration
     */
    public function move($duration): self
    {
        $duration = duration($duration);
        $interval = new self($this->startDate->add($duration), $this->endDate->add($duration));
        if ($interval->equals($this)) {
            return $this;
        }

        return $interval;
    }

    /**
     * Returns an instance where the given DateInterval is simultaneously
     * substracted from the starting datepoint and added to the ending datepoint.
     *
     * This method MUST retain the state of the current instance, and return
     * an instance that contains the specified new datepoints.
     *
     * Depending on the duration value, the resulting instance duration will be expanded or shrinked.
     *
     * @param DateInterval|Period|int|string $duration
     */
    public function expand($duration): self
    {
        $duration = duration($duration);
        $interval = new self($this->startDate->sub($duration), $this->endDate->add($duration));
        if ($interval->equals($this)) {
            return $this;
        }

        return $interval;
    }

    /**
     * Returns the difference between two instances expressed in seconds.
     */
    public function timestampIntervalDiff(self $interval): float
    {
        return $this->getTimestampInterval() - $interval->getTimestampInterval();
    }

    /**
     * Returns the difference between two instances expressed in DateInterval.
     */
    public function dateIntervalDiff(self $interval): DateInterval
    {
        return $this->endDate->diff($this->startDate->add($interval->getDateInterval()));
    }

    /**
     * Merges one or more instances to return a new instance.
     * The resulting instance represents the largest duration possible.
     *
     * @param Period ...$intervals
     */
    public function merge(self $interval, self ...$intervals): self
    {
        array_unshift($intervals, $interval);
        $carry = $this;
        foreach ($intervals as $interval) {
            if ($carry->startDate > $interval->startDate) {
                $carry = $carry->startingOn($interval->startDate);
            }

            if ($carry->endDate < $interval->endDate) {
                $carry = $carry->endingOn($interval->endDate);
            }
        }

        return $carry;
    }
}