Interval Value Objects

This is a library with a set of classes intended to describe intervals as Value Objects and perform operations on them.

Installation

Pretty simple with Composer, run:

composer require gpslab/interval

Interval type

This library is supports interval types.

• [a, b] = [a, b] = {x ∈ ℝ | a ≤ x ≤ b} - Closed
• [a, b) = [a, b[ = {x ∈ ℝ | a ≤ x < b} - Half-closed
• (a, b] = ]a, b] = {x ∈ ℝ | a < x ≤ b} - Half-open
• (a, b) = ]a, b[ = {x ∈ ℝ | a < x < b} - Open

Intervals

• Number
• Date
• Time
• DateTime
• Week
• Month
• Year
• IPv4
• IPv6
• IPv4Network
• IPv6Network

Usage intervals

Create interval [1, 5)

$interval = NumberInterval::halfClosed(1, 5);
echo $interval->start(); // 1
echo $interval->end(); // 5

// convert to string
$string = (string)$interval;
echo $string; // [1, 5)

// restore from string
$new_interval = NumberInterval::fromString($string);
$interval == $new_interval; // true
$interval->equal($new_interval); // true

Change intervals

$interval = NumberInterval::halfClosed(1, 5);
// created a new interval instance
$new_interval = $interval->withStart(new NumberIntervalPoint(2));
$interval->start() != $new_interval->start(); // true

IPv4 network

// from CIDR
$network = IPv4Network::fromCIDR('192.168.0.0', 16);
echo $network->start(); // 192.168.0.0
echo $network->end(); // 192.168.255.255

$network->contains('192.168.13.74'); // true

// from ip mask
$new_network = IPv4Network::fromMask('192.168.0.0', '255.255.0.0');
$network->equal($new_network); // true

Local network

function isLocalNetworkHost($host)
{
    // is IPv6
    if (strpos($host, ':') !== false) {
        // RFC 4193
        return IPv6Network::fromString('fc00::/7')->contains($host);
    }

    // RFC 1918
    return
        IPv4Network::fromString('10/8')->contains($host) ||
        IPv4Network::fromString('172.16/12')->contains($host) ||
        IPv4Network::fromString('192.168/16')->contains($host)
    ;
}

Interval operations

• equal - Checks if this Interval is equal to the specified interval;
• contains - Does this interval contain the specified point;
• intersects - Does this interval intersect the specified interval;
• intersection - Gets the intersection between this interval and another interval;
• cover - Gets the covered interval between this Interval and another interval;
• gap - Gets the gap between this interval and another interval;
• abuts - Does this interval abut with the interval specified;
• join - Joins the interval between the adjacent;
• union - Gets the union between this interval and another interval;
• before - The point is before the interval;
• after - The point is after the interval.

Iterate intervals

The following intervals support iteration:

• Number
• Date
• Time
• DateTime
• Week
• Month
• Year
• IPv4
• IPv4Network

Example usage

Use step 1 and closed interval type [1, 5]

$interval = NumberInterval::closed(1, 5);

$points_in_interval = [];
foreach ($interval->iterate() as $point) {
    $points_in_interval[] = $point;
}

$points_in_interval == [1, 2, 3, 4, 5]; // true

Use step 2 and open interval type (0, 10)

$step = 2;
$interval = NumberInterval::open(0, 10);

$points_in_interval = [];
foreach ($interval->iterate($step) as $point) {
    $points_in_interval[] = $point;
}

$points_in_interval == [2, 4, 6, 8]; // true

Iterate IPv4 interval

$expected = [
    '10.0.1.2',
    '10.0.1.4',
    '10.0.1.6',
    '10.0.1.8'
];
$step = 2;
$interval = IPv4Interval::open('10.0.1.0', '10.0.1.10');

$points_in_interval = [];
foreach ($interval->iterate($step) as $point) {
    $points_in_interval[] = $point;
}
$points_in_interval == $expected; // true

Iterate date interval

$expected = [
    '2017-03-03',
    '2017-03-05',
    '2017-03-07',
    '2017-03-09',
];
$step = new \DateInterval('P2D');
$interval = DateInterval::open(new \DateTime('2017-03-01'), new \DateTime('2017-03-11'));

$points_in_interval = [];
foreach ($interval->iterate($step) as $point) {
    $points_in_interval[] = $point->format('Y-m-d');
}

$points_in_interval == $expected; // true

Persistence in Doctrine

You cat use intervals as Custom Mapping Types for Doctrine.

Type::addType('NumberInterval', 'GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\NumberIntervalType');
$em->getConnection()->getDatabasePlatform()->registerDoctrineTypeMapping('NumberInterval', 'NumberInterval');

You cat registration custom Doctrine mapping types in Symfony

# config/packages/doctrine.yml
doctrine:
    dbal:
        types:
            NumberInterval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\NumberIntervalType
            DateInterval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\DateIntervalType
            TimeInterval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\TimeIntervalType
            DateTimeInterval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\DateTimeIntervalType
            WeekInterval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\WeekIntervalType
            MonthInterval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\MonthIntervalType
            YearInterval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\YearIntervalType
            IPv4Interval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\IPv4IntervalType
            IPv6Interval: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\IPv6IntervalType
            IPv4Network: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\IPv4NetworkType
            IPv6Network: GpsLab\Component\Interval\Persistence\Doctrine\DBAL\Types\IPv6NetworkType

License

This bundle is under the MIT license. See the complete license in the file: LICENSE