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<?php
declare (strict_types=1);
namespace Rector\DeadCode;
use PhpParser\Node\Expr\BinaryOp\Equal;
use PhpParser\Node\Expr\BinaryOp\Identical;
use PhpParser\Node\Expr\BinaryOp\NotEqual;
use PhpParser\Node\Expr\BinaryOp\NotIdentical;
use Rector\Core\Exception\ShouldNotHappenException;
use Rector\Core\Php\PhpVersionProvider;
use Rector\DeadCode\Contract\ConditionInterface;
use Rector\DeadCode\ValueObject\BinaryToVersionCompareCondition;
use Rector\DeadCode\ValueObject\VersionCompareCondition;
final class ConditionEvaluator
{
/**
* @readonly
* @var \Rector\Core\Php\PhpVersionProvider
*/
private $phpVersionProvider;
public function __construct(PhpVersionProvider $phpVersionProvider)
{
$this->phpVersionProvider = $phpVersionProvider;
}
/**
* @return bool|int|null
*/
public function evaluate(ConditionInterface $condition)
{
if ($condition instanceof VersionCompareCondition) {
return $this->evaluateVersionCompareCondition($condition);
}
if ($condition instanceof BinaryToVersionCompareCondition) {
return $this->isEvaluedAsTrue($condition);
}
return null;
}
/**
* @return bool|int|null
*/
private function evaluateVersionCompareCondition(VersionCompareCondition $versionCompareCondition)
{
$compareSign = $versionCompareCondition->getCompareSign();
if ($compareSign !== null) {
if ($compareSign === '<' && $this->phpVersionProvider->provide() < $versionCompareCondition->getSecondVersion()) {
return null;
}
return \version_compare((string) $versionCompareCondition->getFirstVersion(), (string) $versionCompareCondition->getSecondVersion(), $compareSign);
}
return \version_compare((string) $versionCompareCondition->getFirstVersion(), (string) $versionCompareCondition->getSecondVersion());
}
private function isEvaluedAsTrue(BinaryToVersionCompareCondition $binaryToVersionCompareCondition) : bool
{
$versionCompareResult = $this->evaluateVersionCompareCondition($binaryToVersionCompareCondition->getVersionCompareCondition());
if ($binaryToVersionCompareCondition->getBinaryClass() === Identical::class) {
return $binaryToVersionCompareCondition->getExpectedValue() === $versionCompareResult;
}
if ($binaryToVersionCompareCondition->getBinaryClass() === NotIdentical::class) {
return $binaryToVersionCompareCondition->getExpectedValue() !== $versionCompareResult;
}
if ($binaryToVersionCompareCondition->getBinaryClass() === Equal::class) {
// weak comparison on purpose
return $binaryToVersionCompareCondition->getExpectedValue() === $versionCompareResult;
}
if ($binaryToVersionCompareCondition->getBinaryClass() === NotEqual::class) {
// weak comparison on purpose
return $binaryToVersionCompareCondition->getExpectedValue() !== $versionCompareResult;
}
throw new ShouldNotHappenException();
}
}
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