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