Create SimplifyConditionsRector

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

@@ -1,3 +1,4 @@
 services:
     Rector\Rector\CodeQuality\InArrayAndArrayKeysToArrayKeyExistsRector: ~
     Rector\Rector\CodeQuality\UnnecessaryTernaryExpressionRector: ~
+    Rector\Rector\CodeQuality\SimplifyConditionsRector: ~

src/Rector/CodeQuality/SimplifyConditionsRector.php

@@ -0,0 +1,57 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Rector\CodeQuality;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\BinaryOp;
+use PhpParser\Node\Expr\BooleanNot;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+final class SimplifyConditionsRector extends AbstractRector
+{
+    /**
+     * @var string[]
+     */
+    private $binaryOpClassMap = [
+        BinaryOp\Identical::class => BinaryOp\NotIdentical::class,
+        BinaryOp\NotIdentical::class => BinaryOp\Identical::class,
+        BinaryOp\Equal::class => BinaryOp\NotEqual::class,
+        BinaryOp\NotEqual::class => BinaryOp\Equal::class,
+        BinaryOp\Greater::class => BinaryOp\SmallerOrEqual::class,
+        BinaryOp\Smaller::class => BinaryOp\GreaterOrEqual::class,
+        BinaryOp\GreaterOrEqual::class => BinaryOp\Smaller::class,
+        BinaryOp\SmallerOrEqual::class => BinaryOp\Greater::class,
+    ];
+
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition(
+            'Simplify conditions',
+            [new CodeSample("if (! (\$foo !== 'bar')) {...", "if (\$foo === 'bar') {...")]
+        );
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [BooleanNot::class];
+    }
+
+    /**
+     * @param BooleanNot $notNode
+     */
+    public function refactor(Node $notNode): ?Node
+    {
+        if (! $notNode->expr instanceof BinaryOp) {
+            return $notNode;
+        }
+
+        $newBinaryOp = $this->binaryOpClassMap[get_class($notNode->expr)];
+
+        return new $newBinaryOp($notNode->expr->left, $notNode->expr->right);
+    }
+}

tests/Rector/CodeQuality/SimplifyConditionsRector/Correct/correct.php.inc

@@ -0,0 +1,15 @@
+<?php declare(strict_types=1);
+
+if ($foo === 'bar') {
+} elseif ($foo == 'bug') {
+}
+
+function foo ($bar) {
+    return $bar <= 0;
+}
+
+$baz = $foo !== 'baz';
+
+function bar ($foo) {
+    return $foo < 0;
+}

tests/Rector/CodeQuality/SimplifyConditionsRector/SimplifyConditionsRectorTest.php

@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Tests\Rector\CodeQuality\SimplifyConditionsRector;
+
+use Iterator;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+/**
+ * @covers \Rector\Rector\CodeQuality\SimplifyConditionsRector
+ */
+final class SimplifyConditionsRectorTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideWrongToFixedFiles()
+     */
+    public function test(string $wrong, string $fixed): void
+    {
+        $this->doTestFileMatchesExpectedContent($wrong, $fixed);
+    }
+
+    public function provideWrongToFixedFiles(): Iterator
+    {
+        yield [__DIR__ . '/Wrong/wrong.php.inc', __DIR__ . '/Correct/correct.php.inc'];
+    }
+
+    protected function provideConfig(): string
+    {
+        return __DIR__ . '/config.yml';
+    }
+}

tests/Rector/CodeQuality/SimplifyConditionsRector/Wrong/wrong.php.inc

@@ -0,0 +1,15 @@
+<?php declare(strict_types=1);
+
+if (! ($foo !== 'bar')) {
+} elseif (! ($foo != 'bug')) {
+}
+
+function foo ($bar) {
+    return ! ($bar > 0);
+}
+
+$baz = ! ($foo === 'baz');
+
+function bar ($foo) {
+    return ! ($foo >= 0);
+}

tests/Rector/CodeQuality/SimplifyConditionsRector/config.yml

@@ -0,0 +1,2 @@
+services:
+    Rector\Rector\CodeQuality\SimplifyConditionsRector: ~