Integer.php

<?php


/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */
declare (strict_types=1);
namespace Ramsey\Uuid\Type;

use Ramsey\Uuid\Exception\InvalidArgumentException;
use ValueError;
use function assert;
use function is_numeric;
use function preg_match;
use function sprintf;
use function substr;

/**
 * A value object representing an integer
 *
 * This class exists for type-safety purposes, to ensure that integers
 * returned from ramsey/uuid methods as strings are truly integers and not some
 * other kind of string.
 *
 * To support large integers beyond PHP_INT_MAX and PHP_INT_MIN on both 64-bit
 * and 32-bit systems, we store the integers as strings.
 *
 * @psalm-immutable
 */
final class Integer implements NumberInterface {
    
    /**
     * @psalm-var numeric-string
     */
    private string $value;
    private bool $isNegative = false;
    public function __construct(float|int|string|self $value) {
        $this->value = $value instanceof self ? (string) $value : $this->prepareValue($value);
    }
    public function isNegative() : bool {
        return $this->isNegative;
    }
    
    /**
     * @psalm-return numeric-string
     */
    public function toString() : string {
        return $this->value;
    }
    
    /**
     * @psalm-return numeric-string
     */
    public function __toString() : string {
        return $this->toString();
    }
    public function jsonSerialize() : string {
        return $this->toString();
    }
    public function serialize() : string {
        return $this->toString();
    }
    
    /**
     * @return array{string: string}
     */
    public function __serialize() : array {
        return [
            'string' => $this->toString(),
        ];
    }
    
    /**
     * Constructs the object from a serialized string representation
     *
     * @param string $data The serialized string representation of the object
     *
     * @psalm-suppress UnusedMethodCall
     */
    public function unserialize(string $data) : void {
        $this->__construct($data);
    }
    
    /**
     * @param array{string?: string} $data
     */
    public function __unserialize(array $data) : void {
        // @codeCoverageIgnoreStart
        if (!isset($data['string'])) {
            throw new ValueError(sprintf('%s(): Argument #1 ($data) is invalid', __METHOD__));
        }
        // @codeCoverageIgnoreEnd
        $this->unserialize($data['string']);
    }
    
    /**
     * @return numeric-string
     */
    private function prepareValue(float|int|string $value) : string {
        $value = (string) $value;
        $sign = '+';
        // If the value contains a sign, remove it for digit pattern check.
        if (str_starts_with($value, '-') || str_starts_with($value, '+')) {
            $sign = substr($value, 0, 1);
            $value = substr($value, 1);
        }
        if (!preg_match('/^\\d+$/', $value)) {
            throw new InvalidArgumentException('Value must be a signed integer or a string containing only ' . 'digits 0-9 and, optionally, a sign (+ or -)');
        }
        // Trim any leading zeros.
        $value = ltrim($value, '0');
        // Set to zero if the string is empty after trimming zeros.
        if ($value === '') {
            $value = '0';
        }
        // Add the negative sign back to the value.
        if ($sign === '-' && $value !== '0') {
            $value = $sign . $value;
            
            /** @psalm-suppress InaccessibleProperty */
            $this->isNegative = true;
        }
        assert(is_numeric($value));
        return $value;
    }

}