[DeadCode] Add RemoveUselessTernaryRector

Author: samsonasik

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/Fixture/fixture.php.inc

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+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class Fixture
+{
+    public function go(bool $value)
+    {
+        return $value ?: false;
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class Fixture
+{
+    public function go(bool $value)
+    {
+        return $value;
+    }
+}
+
+?>

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/Fixture/skip_different_type.php.inc

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+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class SkipDifferentType
+{
+    public function go(bool $value)
+    {
+        return $value ?: 0;
+    }
+}

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/Fixture/skip_union.php.inc

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+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class SkipUnion
+{
+    public function go(bool|string $value)
+    {
+        return $value ?: false;
+    }
+}

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/Fixture/with_array_empty.php.inc

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+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class WithArrayEmpty
+{
+    public function go(array $value)
+    {
+        return $value ?: [];
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class WithArrayEmpty
+{
+    public function go(array $value)
+    {
+        return $value;
+    }
+}
+
+?>

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/Fixture/with_if_equal.php.inc

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+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class WithIfEqual
+{
+    public function go(bool $value)
+    {
+        return $value ? $value : false;
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class WithIfEqual
+{
+    public function go(bool $value)
+    {
+        return $value;
+    }
+}
+
+?>

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/Fixture/with_if_not_equal.php.inc

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+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class WithIfNotEqual
+{
+    public function go(bool $value)
+    {
+        return $value ? 1 : false;
+    }
+}

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/Fixture/with_integer_zero.php.inc

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+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class WithIntegerZero
+{
+    public function go(int $value)
+    {
+        return $value ?: 0;
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\Fixture;
+
+class WithIntegerZero
+{
+    public function go(int $value)
+    {
+        return $value;
+    }
+}
+
+?>

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/RemoveUselessTernaryRectorTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class RemoveUselessTernaryRectorTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}

rules-tests/DeadCode/Rector/Ternary/RemoveUselessTernaryRector/config/configured_rule.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\DeadCode\Rector\Ternary\RemoveUselessTernaryRector;
+
+return RectorConfig::configure()
+    ->withRules([RemoveUselessTernaryRector::class]);

rules/DeadCode/Rector/Ternary/RemoveUselessTernaryRector.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Rector\DeadCode\Rector\Ternary;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\Array_;
+use PhpParser\Node\Expr\Ternary;
+use PhpParser\Node\Scalar\Int_;
+use PHPStan\Type\ArrayType;
+use PHPStan\Type\BooleanType;
+use PHPStan\Type\IntegerType;
+use Rector\PhpParser\Node\Value\ValueResolver;
+use Rector\Rector\AbstractRector;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @see \Rector\Tests\DeadCode\Rector\Ternary\RemoveUselessTernaryRector\RemoveUselessTernaryRectorTest
+ */
+final class RemoveUselessTernaryRector extends AbstractRector
+{
+    public function __construct(
+        private readonly ValueResolver $valueResolver
+    ) {
+    }
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition('Remove useless ternary if fallback is falsey of left code', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+function go(bool $value)
+{
+    return $value ?: false;
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+function go(bool $value)
+{
+    return $value;
+}
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return array<class-string<Node>>
+     */
+    public function getNodeTypes(): array
+    {
+        return [Ternary::class];
+    }
+
+    /**
+     * @param Ternary $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if ($node->if instanceof Expr && ! $this->nodeComparator->areNodesEqual($node->if, $node->cond)) {
+            return null;
+        }
+
+        $nativeType = $this->nodeTypeResolver->getNativeType($node->cond);
+        if ($nativeType instanceof BooleanType && $this->valueResolver->isFalse($node->else)) {
+            return $node->cond;
+        }
+
+        if ($nativeType instanceof ArrayType && $node->else instanceof Array_ && $node->else->items === []) {
+            return $node->cond;
+        }
+
+        if ($nativeType instanceof IntegerType && $node->else instanceof Int_ && $node->else->value === 0) {
+            return $node->cond;
+        }
+
+        return null;
+    }
+}