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<?php
declare (strict_types=1);
namespace Rector\ReadWrite\Guard;
use PhpParser\Node\Arg;
use PhpParser\Node\Expr\CallLike;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Name;
use PHPStan\Analyser\Scope;
use PHPStan\Reflection\FunctionReflection;
use PHPStan\Reflection\ParameterReflection;
use PHPStan\Reflection\ReflectionProvider;
use Rector\Core\Exception\ShouldNotHappenException;
use Rector\NodeNameResolver\NodeNameResolver;
use Rector\NodeTypeResolver\Node\AttributeKey;
use Rector\NodeTypeResolver\PHPStan\ParametersAcceptorSelectorVariantsWrapper;
final class VariableToConstantGuard
{
/**
* @var array<string, array<int>>
*/
private $referencePositionsByFunctionName = [];
/**
* @readonly
* @var \Rector\NodeNameResolver\NodeNameResolver
*/
private $nodeNameResolver;
/**
* @readonly
* @var \PHPStan\Reflection\ReflectionProvider
*/
private $reflectionProvider;
public function __construct(NodeNameResolver $nodeNameResolver, ReflectionProvider $reflectionProvider)
{
$this->nodeNameResolver = $nodeNameResolver;
$this->reflectionProvider = $reflectionProvider;
}
public function isReadArg(Arg $arg) : bool
{
$parentParent = $arg->getAttribute(AttributeKey::PARENT_NODE);
if (!$parentParent instanceof FuncCall) {
return \true;
}
$functionNameString = $this->nodeNameResolver->getName($parentParent);
if ($functionNameString === null) {
return \true;
}
$functionName = new Name($functionNameString);
$argScope = $arg->getAttribute(AttributeKey::SCOPE);
if (!$this->reflectionProvider->hasFunction($functionName, $argScope)) {
// we don't know
return \true;
}
$functionReflection = $this->reflectionProvider->getFunction($functionName, $argScope);
if (!$argScope instanceof Scope) {
return \true;
}
$parentArg = $arg->getAttribute(AttributeKey::PARENT_NODE);
if (!$parentArg instanceof CallLike) {
return \true;
}
$referenceParametersPositions = $this->resolveFunctionReferencePositions($functionReflection, $parentArg, $argScope);
if ($referenceParametersPositions === []) {
// no reference always only write
return \true;
}
$argumentPosition = $this->getArgumentPosition($parentParent, $arg);
return !\in_array($argumentPosition, $referenceParametersPositions, \true);
}
/**
* @return int[]
*/
private function resolveFunctionReferencePositions(FunctionReflection $functionReflection, CallLike $callLike, Scope $scope) : array
{
if (isset($this->referencePositionsByFunctionName[$functionReflection->getName()])) {
return $this->referencePositionsByFunctionName[$functionReflection->getName()];
}
$referencePositions = [];
$parametersAcceptor = ParametersAcceptorSelectorVariantsWrapper::select($functionReflection, $callLike, $scope);
foreach ($parametersAcceptor->getParameters() as $position => $parameterReflection) {
/** @var ParameterReflection $parameterReflection */
if (!$parameterReflection->passedByReference()->yes()) {
continue;
}
$referencePositions[] = $position;
}
$this->referencePositionsByFunctionName[$functionReflection->getName()] = $referencePositions;
return $referencePositions;
}
private function getArgumentPosition(FuncCall $funcCall, Arg $desiredArg) : int
{
foreach ($funcCall->args as $position => $arg) {
if ($arg !== $desiredArg) {
continue;
}
return $position;
}
throw new ShouldNotHappenException();
}
}