[DowngradePhp80] Handle return throw ternary on DowngradeThrowExprRector (#224)

* [DowngradePhp80] Handle return throw ternary on DowngradeThrowExprRector

* [ci-review] Rector Rectify

* Fix phpstan

* Fix phpstan

* Fix phpstan

---------

Co-authored-by: GitHub Action <[email protected]>

Author: samsonasik

rules-tests/DowngradePhp80/Rector/Expression/DowngradeThrowExprRector/Fixture/return_throw_ternary.php.inc

@@ -0,0 +1,30 @@
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Expression\DowngradeThrowExprRector\Fixture;
+
+final class ReturnThrowTernary
+{
+    public function run($variable)
+    {
+        return $variable ?: throw new \InvalidArgumentException();
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Expression\DowngradeThrowExprRector\Fixture;
+
+final class ReturnThrowTernary
+{
+    public function run($variable)
+    {
+        if (!$variable) {
+            throw new \InvalidArgumentException();
+        }
+        return $variable;
+    }
+}
+
+?>

rules/DowngradePhp80/Rector/Expression/DowngradeThrowExprRector.php

@@ -211,6 +211,15 @@ private function refactorReturn(Return_ $return): ?array
             return [new Expression($return->expr)];
         }
 
+        if ($return->expr instanceof Ternary) {
+            $if = $this->refactorTernary($return->expr, null);
+            if (! $if instanceof If_) {
+                return null;
+            }
+
+            return [$if, new Return_($return->expr->cond)];
+        }
+
         return null;
     }