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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Intl\Util;
/**
* Facilitates the comparison of version strings.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class Version
{
/**
* Compares two versions with an operator.
*
* This method is identical to {@link version_compare()}, except that you
* can pass the number of regarded version components in the last argument
* $precision.
*
* Examples:
*
* Version::compare('1.2.3', '1.2.4', '==')
* // => false
*
* Version::compare('1.2.3', '1.2.4', '==', 2)
* // => true
*
* @param string $version1 A version string.
* @param string $version2 A version string to compare.
* @param string $operator The comparison operator.
* @param integer|null $precision The number of components to compare. Pass
* NULL to compare the versions unchanged.
*
* @return Boolean Whether the comparison succeeded.
*
* @see normalize()
*/
public static function compare($version1, $version2, $operator, $precision = null)
{
$version1 = self::normalize($version1, $precision);
$version2 = self::normalize($version2, $precision);
return version_compare($version1, $version2, $operator);
}
/**
* Normalizes a version string to the number of components given in the
* parameter $precision.
*
* Examples:
*
* Version::normalize('1.2.3', 1);
* // => '1'
*
* Version::normalize('1.2.3', 2);
* // => '1.2'
*
* @param string $version A version string.
* @param integer|null $precision The number of components to include. Pass
* NULL to return the version unchanged.
*
* @return string|null The normalized version or NULL if it couldn't be
* normalized.
*/
public static function normalize($version, $precision)
{
if (null === $precision) {
return $version;
}
$pattern = '[^\.]+';
for ($i = 2; $i <= $precision; ++$i) {
$pattern = sprintf('[^\.]+(\.%s)?', $pattern);
}
if (!preg_match('/^' . $pattern . '/', $version, $matches)) {
return null;
}
return $matches[0];
}
/**
* Must not be instantiated.
*/
private function __construct() {}
}
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