items[$key])) {
return $this->items[$key];
}
return 'fallback value';
}
}
CODE_SAMPLE
, <<<'CODE_SAMPLE'
class SomeClass
{
private $items = [];
public function resolve($key)
{
return $this->items[$key] ?? 'fallback value';
}
}
CODE_SAMPLE
)]);
}
/**
* @return array>
*/
public function getNodeTypes() : array
{
return [StmtsAwareInterface::class];
}
/**
* @param StmtsAwareInterface $node
*/
public function refactor(Node $node) : ?Node
{
if ($node->stmts === null) {
return null;
}
foreach ($node->stmts as $key => $stmt) {
if (!$stmt instanceof Return_) {
continue;
}
if (!$stmt->expr instanceof Expr) {
continue;
}
$previousStmt = $node->stmts[$key - 1] ?? null;
if (!$previousStmt instanceof If_) {
continue;
}
if (!$previousStmt->cond instanceof Isset_) {
continue;
}
$ifOnlyStmt = $this->matchBareIfOnlyStmt($previousStmt);
if (!$ifOnlyStmt instanceof Return_) {
continue;
}
if (!$ifOnlyStmt->expr instanceof Expr) {
continue;
}
$ifIsset = $previousStmt->cond;
if (!$this->nodeComparator->areNodesEqual($ifOnlyStmt->expr, $ifIsset->vars[0])) {
continue;
}
unset($node->stmts[$key - 1]);
$stmt->expr = new Coalesce($ifOnlyStmt->expr, $stmt->expr);
return $node;
}
return null;
}
public function provideMinPhpVersion() : int
{
return PhpVersionFeature::NULL_COALESCE;
}
private function matchBareIfOnlyStmt(If_ $if) : ?Stmt
{
if ($if->else instanceof Else_) {
return null;
}
if ($if->elseifs !== []) {
return null;
}
if (\count($if->stmts) !== 1) {
return null;
}
return $if->stmts[0];
}
}