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<?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 Rector\PhpParser\Node\AssignAndBinaryMap; use Rector\PhpParser\Node\Value\ValueResolver; use Rector\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 AbstractRector { /** * @readonly * @var \Rector\PhpParser\Node\AssignAndBinaryMap */ private $assignAndBinaryMap; /** * @readonly * @var \Rector\PhpParser\Node\Value\ValueResolver */ private $valueResolver; public function __construct(AssignAndBinaryMap $assignAndBinaryMap, ValueResolver $valueResolver) { $this->assignAndBinaryMap = $assignAndBinaryMap; $this->valueResolver = $valueResolver; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Remove unnecessary ternary expressions', [new CodeSample('$foo === $bar ? true : false;', '$foo === $bar;')]); } /** * @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) { return null; } $ifExpression = $node->if; if (!$this->valueResolver->isTrueOrFalse($ifExpression)) { return null; } $elseExpression = $node->else; if (!$this->valueResolver->isTrueOrFalse($elseExpression)) { return null; } $condition = $node->cond; if (!$condition instanceof 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(Expr $ifExpression, Expr $elseExpression, Expr $condition) : ?Node { if ($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(Expr $expr) : Expr { $exprType = $this->getType($expr); if ($exprType->isBoolean()->yes()) { return $expr; } return new Bool_($expr); } private function processFalseIfExpressionWithTrueElseExpression(Expr $expr) : Expr { if ($expr instanceof BooleanNot) { $negatedExprType = $this->getType($expr->expr); if ($negatedExprType->isBoolean()->yes()) { return $expr->expr; } return new Bool_($expr->expr); } $exprType = $this->getType($expr); if ($exprType->isBoolean()->yes()) { return new BooleanNot($expr); } return new BooleanNot(new Bool_($expr)); } }
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