[CodeQuality] Add SplitListScalarAssignToSeparateLineRector

config/set/code-quality/code-quality.yaml

@@ -54,3 +54,4 @@ services:
     Rector\CodeQuality\Rector\Foreach_\ForeachItemsAssignToEmptyArrayToAssignRector: null
     Rector\CodeQuality\Rector\BinaryOp\InlineIfToExplicitIfRector: null
     Rector\CodeQuality\Rector\FuncCall\ArrayKeysAndInArrayToArrayKeyExistsRector: null
+    Rector\CodeQuality\Rector\Assign\SplitListAssignToSeparateLineRector: null

docs/AllRectorsOverview.md

@@ -1,4 +1,4 @@
-# All 497 Rectors Overview
+# All 498 Rectors Overview
 
 - [Projects](#projects)
 - [General](#general)
@@ -1726,6 +1726,27 @@ Changes in_array() with single element to ===
 
 <br>
 
+### `SplitListAssignToSeparateLineRector`
+
+- class: [`Rector\CodeQuality\Rector\Assign\SplitListAssignToSeparateLineRector`](/../master/rules/code-quality/src/Rector/Assign/SplitListAssignToSeparateLineRector.php)
+- [test fixtures](/../master/rules/code-quality/tests/Rector/Assign/SplitListAssignToSeparateLineRector/Fixture)
+
+Splits [$a, $b] = [5, 10] scalar assign to standalone lines
+
+```diff
+ final class SomeClass
+ {
+     public function run(): void
+     {
+-        [$a, $b] = [1, 2];
++        $a = 1;
++        $b = 2;
+     }
+ }
+```
+
+<br>
+
 ### `StrlenZeroToIdenticalEmptyStringRector`
 
 - class: [`Rector\CodeQuality\Rector\FuncCall\StrlenZeroToIdenticalEmptyStringRector`](/../master/rules/code-quality/src/Rector/FuncCall/StrlenZeroToIdenticalEmptyStringRector.php)

rules/code-quality/src/Rector/Assign/SplitListAssignToSeparateLineRector.php

@@ -0,0 +1,146 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\CodeQuality\Rector\Assign;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Array_;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\List_;
+use Rector\Core\Rector\AbstractRector;
+use Rector\Core\RectorDefinition\CodeSample;
+use Rector\Core\RectorDefinition\RectorDefinition;
+
+/**
+ * @see https://mobile.twitter.com/ivanhoe011/status/1246376872931401728
+ *
+ * @see \Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\SplitListAssignToSeparateLineRectorTest
+ */
+final class SplitListAssignToSeparateLineRector extends AbstractRector
+{
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Splits [$a, $b] = [5, 10] scalar assign to standalone lines', [
+            new CodeSample(
+                <<<'PHP'
+final class SomeClass
+{
+    public function run(): void
+    {
+        [$a, $b] = [1, 2];
+    }
+}
+PHP
+,
+                <<<'PHP'
+final class SomeClass
+{
+    public function run(): void
+    {
+        $a = 1;
+        $b = 2;
+    }
+}
+PHP
+
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [Assign::class];
+    }
+
+    /**
+     * @param Assign $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if ($this->shouldSkip($node)) {
+            return null;
+        }
+
+        /** @var Array_|List_ $leftArray */
+        $leftArray = $node->var;
+
+        /** @var Array_ $rightArray */
+        $rightArray = $node->expr;
+
+        $standaloneAssigns = $this->createStandaloneAssigns($leftArray, $rightArray);
+        foreach ($standaloneAssigns as $standaloneAssign) {
+            $this->addNodeAfterNode($standaloneAssign, $node);
+        }
+
+        $this->removeNode($node);
+
+        return $node;
+    }
+
+    private function shouldSkip($node): bool
+    {
+        if (! $node->var instanceof Array_ && ! $node->var instanceof List_) {
+            return true;
+        }
+
+        if (! $node->expr instanceof Array_) {
+            return true;
+        }
+
+        if (count($node->var->items) !== count($node->expr->items)) {
+            return true;
+        }
+
+        // is value swap
+        return $this->isValueSwap($node->var, $node->expr);
+    }
+
+    /**
+     * @param Array_|List_ $node
+     * @return Assign[]
+     */
+    private function createStandaloneAssigns(Node $node, Array_ $rightArray): array
+    {
+        $standaloneAssigns = [];
+        foreach ($node->items as $key => $leftArrayItem) {
+            $rightArrayItem = $rightArray->items[$key];
+
+            $standaloneAssigns[] = new Assign($leftArrayItem->value, $rightArrayItem);
+        }
+
+        return $standaloneAssigns;
+    }
+
+    /**
+     * @param Array_|List_ $node
+     */
+    private function getArrayItemsHash(Node $node): string
+    {
+        $arrayItemsHashes = [];
+        foreach ($node->items as $arrayItem) {
+            $arrayItemsHashes[] = $this->printWithoutComments($arrayItem);
+        }
+
+        sort($arrayItemsHashes);
+
+        $arrayItemsHash = implode('', $arrayItemsHashes);
+
+        return sha1($arrayItemsHash);
+    }
+
+    /**
+     * @param Array_|List_ $firstArray
+     * @param Array_|List_ $secondArray
+     */
+    private function isValueSwap($firstArray, $secondArray): bool
+    {
+        $firstArrayItemsHash = $this->getArrayItemsHash($firstArray);
+        $secondArrayItemsHash = $this->getArrayItemsHash($secondArray);
+
+        return $firstArrayItemsHash === $secondArrayItemsHash;
+    }
+}

rules/code-quality/tests/Rector/Assign/SplitListAssignToSeparateLineRector/Fixture/fixture.php.inc

@@ -0,0 +1,28 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class SomeClass
+{
+    public function run(): void
+    {
+        [$a, $b] = [1, 2];
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class SomeClass
+{
+    public function run(): void
+    {
+        $a = 1;
+        $b = 2;
+    }
+}
+
+?>

rules/code-quality/tests/Rector/Assign/SplitListAssignToSeparateLineRector/Fixture/not_scalar.php.inc

@@ -0,0 +1,30 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class NotScalar
+{
+    public function run(): void
+    {
+        $itemCount = 100;
+        [$a, $b] = [1, $itemCount];
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class NotScalar
+{
+    public function run(): void
+    {
+        $itemCount = 100;
+        $a = 1;
+        $b = $itemCount;
+    }
+}
+
+?>

rules/code-quality/tests/Rector/Assign/SplitListAssignToSeparateLineRector/Fixture/skip_split_of_array.php.inc

@@ -0,0 +1,12 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class SkipSplitOfArray
+{
+    public function run(): void
+    {
+        $moreItems = [1, 2];
+        [$a, $b] = $moreItems;
+    }
+}

rules/code-quality/tests/Rector/Assign/SplitListAssignToSeparateLineRector/Fixture/skip_swap.php.inc

@@ -0,0 +1,13 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class SkipSwap
+{
+    public function run(): void
+    {
+        $a = 1;
+        $b = 5;
+        [$a, $b] = [$b, $a];
+    }
+}

rules/code-quality/tests/Rector/Assign/SplitListAssignToSeparateLineRector/Fixture/with_list_function.php.inc

@@ -0,0 +1,28 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class WithListFunction
+{
+    public function run(): void
+    {
+        list($a, $b) = [1, 2];
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector\Fixture;
+
+final class WithListFunction
+{
+    public function run(): void
+    {
+        $a = 1;
+        $b = 2;
+    }
+}
+
+?>

rules/code-quality/tests/Rector/Assign/SplitListAssignToSeparateLineRector/SplitListAssignToSeparateLineRectorTest.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\CodeQuality\Tests\Rector\Assign\SplitListAssignToSeparateLineRector;
+
+use Iterator;
+use Rector\CodeQuality\Rector\Assign\SplitListAssignToSeparateLineRector;
+use Rector\Core\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class SplitListAssignToSeparateLineRectorTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideData()
+     */
+    public function test(string $file): void
+    {
+        $this->doTestFile($file);
+    }
+
+    public function provideData(): Iterator
+    {
+        return $this->yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    protected function getRectorClass(): string
+    {
+        return SplitListAssignToSeparateLineRector::class;
+    }
+}

rules/php70/src/Rector/Ternary/TernaryToNullCoalescingRector.php

@@ -53,9 +53,11 @@ final class TernaryToNullCoalescingRector extends AbstractRector
         }
 
         if ($node->cond instanceof Identical) {
-            [$checkedNode, $fallbackNode] = [$node->else, $node->if];
+            $checkedNode = $node->else;
+            $fallbackNode = $node->if;
         } elseif ($node->cond instanceof NotIdentical) {
-            [$checkedNode, $fallbackNode] = [$node->if, $node->else];
+            $checkedNode = $node->if;
+            $fallbackNode = $node->else;
         } else {
             // not a match
             return null;