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<?php
declare(strict_types=1);
namespace Version\Comparison;
use Version\Version;
final class SemverComparator implements Comparator
{
public function compare(Version $version1, Version $version2): int
if (0 !== ($majorCompareResult = $this->compareNumberPart($version1->getMajor(), $version2->getMajor()))) {
return $majorCompareResult;
}
if (0 !== ($minorCompareResult = $this->compareNumberPart($version1->getMinor(), $version2->getMinor()))) {
return $minorCompareResult;
if (0 !== ($patchCompareResult = $this->compareNumberPart($version1->getPatch(), $version2->getPatch()))) {
return $patchCompareResult;
return $this->compareMeta($version1, $version2);
private function compareNumberPart(int $number1, int $number2): int
$diff = $number1 - $number2;
if ($diff > 0) {
return 1;
if ($diff < 0) {
return -1;
return 0;
private function compareMeta(Version $version1, Version $version2): int
$v1IsPreRelease = $version1->isPreRelease();
$v2IsPreRelease = $version2->isPreRelease();
if ($v1IsPreRelease xor $v2IsPreRelease) {
return !$v1IsPreRelease
? 1 // normal version has greater precedence than a pre-release version version
: -1; // pre-release version has lower precedence than a normal version
$result = $version1->getPreRelease()->compareTo($version2->getPreRelease());
if ($result > 0) {
if ($result < 0) {