rector/rules/CodeQuality/Rector/Ternary/UnnecessaryTernaryExpressionRector.php

<?php

declare (strict_types=1);
namespace Rector\CodeQuality\Rector\Ternary;

use PhpParser\Node;
use PhpParser\Node\Expr;
use PhpParser\Node\Expr\BinaryOp;
use PhpParser\Node\Expr\BooleanNot;
use PhpParser\Node\Expr\Cast\Bool_;
use PhpParser\Node\Expr\Ternary;
use PHPStan\Type\BooleanType;
use Rector\Core\PhpParser\Node\AssignAndBinaryMap;
use Rector\Core\Rector\AbstractRector;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
/**
 * @see \Rector\Tests\CodeQuality\Rector\Ternary\UnnecessaryTernaryExpressionRector\UnnecessaryTernaryExpressionRectorTest
 */
final class UnnecessaryTernaryExpressionRector extends \Rector\Core\Rector\AbstractRector
{
    /**
     * @var \Rector\Core\PhpParser\Node\AssignAndBinaryMap
     */
    private $assignAndBinaryMap;
    public function __construct(\Rector\Core\PhpParser\Node\AssignAndBinaryMap $assignAndBinaryMap)
    {
        $this->assignAndBinaryMap = $assignAndBinaryMap;
    }
    public function getRuleDefinition() : \Symplify\RuleDocGenerator\ValueObject\RuleDefinition
    {
        return new \Symplify\RuleDocGenerator\ValueObject\RuleDefinition('Remove unnecessary ternary expressions.', [new \Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample('$foo === $bar ? true : false;', '$foo === $bar;')]);
    }
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes() : array
    {
        return [\PhpParser\Node\Expr\Ternary::class];
    }
    /**
     * @param Ternary $node
     */
    public function refactor(\PhpParser\Node $node) : ?\PhpParser\Node
    {
        /** @var Ternary $ternaryExpression */
        $ternaryExpression = $node;
        if (!$ternaryExpression->if instanceof \PhpParser\Node\Expr) {
            return null;
        }
        $ifExpression = $ternaryExpression->if;
        if (!$this->valueResolver->isTrueOrFalse($ifExpression)) {
            return null;
        }
        $elseExpression = $ternaryExpression->else;
        if (!$this->valueResolver->isTrueOrFalse($elseExpression)) {
            return null;
        }
        $condition = $ternaryExpression->cond;
        if (!$condition instanceof \PhpParser\Node\Expr\BinaryOp) {
            return $this->processNonBinaryCondition($ifExpression, $elseExpression, $condition);
        }
        if ($this->valueResolver->isNull($ifExpression)) {
            return null;
        }
        if ($this->valueResolver->isNull($elseExpression)) {
            return null;
        }
        /** @var BinaryOp $binaryOperation */
        $binaryOperation = $node->cond;
        if ($this->valueResolver->isTrue($ifExpression) && $this->valueResolver->isFalse($elseExpression)) {
            return $binaryOperation;
        }
        $inversedBinaryClass = $this->assignAndBinaryMap->getInversed($binaryOperation);
        if ($inversedBinaryClass === null) {
            return null;
        }
        return new $inversedBinaryClass($binaryOperation->left, $binaryOperation->right);
    }
    private function processNonBinaryCondition(\PhpParser\Node\Expr $ifExpression, \PhpParser\Node\Expr $elseExpression, \PhpParser\Node\Expr $condition) : ?\PhpParser\Node
    {
        if ($this->valueResolver->isTrue($ifExpression) && $this->valueResolver->isFalse($elseExpression)) {
            return $this->processTrueIfExpressionWithFalseElseExpression($condition);
        }
        if (!$this->valueResolver->isFalse($ifExpression)) {
            return null;
        }
        if (!$this->valueResolver->isTrue($elseExpression)) {
            return null;
        }
        return $this->processFalseIfExpressionWithTrueElseExpression($condition);
    }
    private function processTrueIfExpressionWithFalseElseExpression(\PhpParser\Node\Expr $expr) : \PhpParser\Node\Expr
    {
        if ($this->nodeTypeResolver->isStaticType($expr, \PHPStan\Type\BooleanType::class)) {
            return $expr;
        }
        return new \PhpParser\Node\Expr\Cast\Bool_($expr);
    }
    private function processFalseIfExpressionWithTrueElseExpression(\PhpParser\Node\Expr $expr) : \PhpParser\Node\Expr
    {
        if ($expr instanceof \PhpParser\Node\Expr\BooleanNot) {
            if ($this->nodeTypeResolver->isStaticType($expr->expr, \PHPStan\Type\BooleanType::class)) {
                return $expr->expr;
            }
            return new \PhpParser\Node\Expr\Cast\Bool_($expr->expr);
        }
        if ($this->nodeTypeResolver->isStaticType($expr, \PHPStan\Type\BooleanType::class)) {
            return new \PhpParser\Node\Expr\BooleanNot($expr);
        }
        return new \PhpParser\Node\Expr\BooleanNot(new \PhpParser\Node\Expr\Cast\Bool_($expr));
    }
}