valueResolver = $valueResolver;
}
public function getRuleDefinition() : RuleDefinition
{
return new RuleDefinition('Changes unneeded null check to ?? operator', [new CodeSample('$value === null ? 10 : $value;', '$value ?? 10;'), new CodeSample('isset($value) ? $value : 10;', '$value ?? 10;')]);
}
/**
* @return array>
*/
public function getNodeTypes() : array
{
return [Ternary::class];
}
/**
* @param Ternary $node
*/
public function refactor(Node $node) : ?Node
{
if ($node->cond instanceof Isset_) {
return $this->processTernaryWithIsset($node, $node->cond);
}
if ($node->cond instanceof Identical) {
$checkedNode = $node->else;
$fallbackNode = $node->if;
} elseif ($node->cond instanceof NotIdentical) {
$checkedNode = $node->if;
$fallbackNode = $node->else;
} else {
// not a match
return null;
}
if (!$checkedNode instanceof Expr) {
return null;
}
if (!$fallbackNode instanceof Expr) {
return null;
}
/** @var Identical|NotIdentical $ternaryCompareNode */
$ternaryCompareNode = $node->cond;
if ($this->isNullMatch($ternaryCompareNode->left, $ternaryCompareNode->right, $checkedNode)) {
return new Coalesce($checkedNode, $fallbackNode);
}
if ($this->isNullMatch($ternaryCompareNode->right, $ternaryCompareNode->left, $checkedNode)) {
return new Coalesce($checkedNode, $fallbackNode);
}
return null;
}
public function provideMinPhpVersion() : int
{
return PhpVersionFeature::NULL_COALESCE;
}
private function processTernaryWithIsset(Ternary $ternary, Isset_ $isset) : ?Coalesce
{
if (!$ternary->if instanceof Expr) {
return null;
}
if ($isset->vars === null) {
return null;
}
// none or multiple isset values cannot be handled here
if (\count($isset->vars) > 1) {
return null;
}
if (!$this->nodeComparator->areNodesEqual($ternary->if, $isset->vars[0])) {
return null;
}
return new Coalesce($ternary->if, $ternary->else);
}
private function isNullMatch(Expr $possibleNullExpr, Expr $firstNode, Expr $secondNode) : bool
{
if (!$this->valueResolver->isNull($possibleNullExpr)) {
return \false;
}
return $this->nodeComparator->areNodesEqual($firstNode, $secondNode);
}
}