[CodeQuality] Add SingleInArrayToCompareRector [closes #858]

config/level/code-quality/code-quality.yml

@@ -20,3 +20,4 @@ services:
     Rector\CodeQuality\Rector\BinaryOp\SimplifyDeMorganBinaryRector: ~
     Rector\CodeQuality\Rector\Ternary\SimplifyTautologyTernaryRector: ~
     Rector\CodeQuality\Rector\Foreach_\SimplifyForeachToArrayFilterRector: ~
+    Rector\CodeQuality\Rector\FuncCall\SingleInArrayToCompareRector: ~

packages/CodeQuality/src/Rector/FuncCall/SingleInArrayToCompareRector.php

@@ -0,0 +1,81 @@
+<?php declare(strict_types=1);
+
+namespace Rector\CodeQuality\Rector\FuncCall;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Array_;
+use PhpParser\Node\Expr\BinaryOp\Equal;
+use PhpParser\Node\Expr\BinaryOp\Identical;
+use PhpParser\Node\Expr\FuncCall;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+final class SingleInArrayToCompareRector extends AbstractRector
+{
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Changes in_array() with single element to ===', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+class SomeClass
+{
+    public function run()
+    {
+        if (in_array(strtolower($type), ['$this'], true)) {
+            return strtolower($type);
+        }
+    }
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+class SomeClass
+{
+    public function run()
+    {
+        if (strtolower($type) === '$this') {
+            return strtolower($type);
+        }
+    }
+}
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [FuncCall::class];
+    }
+
+    /**
+     * @param FuncCall $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (! $this->isName($node, 'in_array')) {
+            return null;
+        }
+
+        if (! $node->args[1]->value instanceof Array_) {
+            return null;
+        }
+
+        /** @var Array_ $arrayNode */
+        $arrayNode = $node->args[1]->value;
+        if (count($arrayNode->items) !== 1) {
+            return null;
+        }
+
+        $onlyArrayItem = $arrayNode->items[0]->value;
+        if (isset($node->args[2])) { // strict
+            return new Identical($node->args[0]->value, $onlyArrayItem);
+        }
+
+        return new Equal($node->args[0]->value, $onlyArrayItem);
+    }
+}

packages/CodeQuality/tests/Rector/FuncCall/SingleInArrayToCompareRector/Fixture/fixture.php.inc

@@ -0,0 +1,33 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\FuncCall\SingleInArrayToCompareRector\Fixture;
+
+class SomeClass
+{
+    public function run()
+    {
+        $isIt = in_array(strtolower($type), ['$this'], true);
+        $isIt = in_array(strtolower($type), ['$this']);
+
+        $isIt = in_array(strtolower($type), ['$this', 'two']);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\FuncCall\SingleInArrayToCompareRector\Fixture;
+
+class SomeClass
+{
+    public function run()
+    {
+        $isIt = strtolower($type) === '$this';
+        $isIt = strtolower($type) == '$this';
+
+        $isIt = in_array(strtolower($type), ['$this', 'two']);
+    }
+}
+
+?>

packages/CodeQuality/tests/Rector/FuncCall/SingleInArrayToCompareRector/SingleInArrayToCompareRectorTest.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace Rector\CodeQuality\Tests\Rector\FuncCall\SingleInArrayToCompareRector;
+
+use Rector\CodeQuality\Rector\FuncCall\SingleInArrayToCompareRector;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class SingleInArrayToCompareRectorTest extends AbstractRectorTestCase
+{
+    public function test(): void
+    {
+        $this->doTestFiles([__DIR__ . '/Fixture/fixture.php.inc']);
+    }
+
+    protected function getRectorClass(): string
+    {
+        return SingleInArrayToCompareRector::class;
+    }
+}