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<?php declare (strict_types=1); namespace Rector\CodingStyle\Rector\FuncCall; use PhpParser\Node; use PhpParser\Node\Arg; use PhpParser\Node\Expr; use PhpParser\Node\Expr\Array_; use PhpParser\Node\Expr\BinaryOp\Greater; use PhpParser\Node\Expr\BinaryOp\Identical; use PhpParser\Node\Expr\BinaryOp\NotIdentical; use PhpParser\Node\Expr\BinaryOp\Smaller; use PhpParser\Node\Expr\BooleanNot; use PhpParser\Node\Expr\FuncCall; use PhpParser\Node\Scalar\LNumber; use PhpParser\Node\Stmt\ElseIf_; use PhpParser\Node\Stmt\If_; use PHPStan\Type\ArrayType; use Rector\Core\Rector\AbstractRector; use Rector\NodeTypeResolver\Node\AttributeKey; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @see \Rector\Tests\CodingStyle\Rector\FuncCall\CountArrayToEmptyArrayComparisonRector\CountArrayToEmptyArrayComparisonRectorTest */ final class CountArrayToEmptyArrayComparisonRector extends AbstractRector { public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Change count array comparison to empty array comparison to improve performance', [new CodeSample(<<<'CODE_SAMPLE' count($array) === 0; count($array) > 0; ! count($array); CODE_SAMPLE , <<<'CODE_SAMPLE' $array === []; $array !== []; $array === []; CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [FuncCall::class, BooleanNot::class]; } /** * @param FuncCall|BooleanNot $node */ public function refactor(Node $node) : ?Node { if ($node instanceof BooleanNot) { return $this->processMarkTruthyNegation($node); } if (!$this->isName($node, 'count')) { return null; } if (!isset($node->args[0])) { return null; } if (!$node->args[0] instanceof Arg) { return null; } /** @var Expr $expr */ $expr = $node->args[0]->value; // not pass array type, skip if (!$this->isArray($expr)) { return null; } $parent = $node->getAttribute(AttributeKey::PARENT_NODE); if (!$parent instanceof Node) { return null; } $processIdentical = $this->processIdenticalOrNotIdentical($parent, $node, $expr); if ($processIdentical !== null) { return $processIdentical; } $processGreaterOrSmaller = $this->processGreaterOrSmaller($parent, $node, $expr); if ($processGreaterOrSmaller !== null) { return $processGreaterOrSmaller; } return $this->processMarkTruthy($parent, $node, $expr); } private function processMarkTruthyNegation(BooleanNot $booleanNot) : ?Identical { if (!$booleanNot->expr instanceof FuncCall) { return null; } if (!$this->isName($booleanNot->expr, 'count')) { return null; } if (!isset($booleanNot->expr->args[0])) { return null; } if (!$booleanNot->expr->args[0] instanceof Arg) { return null; } /** @var Expr $expr */ $expr = $booleanNot->expr->args[0]->value; // not pass array type, skip if (!$this->isArray($expr)) { return null; } return new Identical($expr, new Array_([])); } private function isArray(Expr $expr) : bool { return $this->getType($expr) instanceof ArrayType; } private function processIdenticalOrNotIdentical(Node $node, FuncCall $funcCall, Expr $expr) : ?Expr { if (($node instanceof Identical || $node instanceof NotIdentical) && $node->right instanceof LNumber && $node->right->value === 0) { $this->removeNode($funcCall); $node->right = new Array_([]); return $expr; } if (($node instanceof Identical || $node instanceof NotIdentical) && $node->left instanceof LNumber && $node->left->value === 0) { $this->removeNode($funcCall); $node->left = new Array_([]); return $expr; } return null; } private function processGreaterOrSmaller(Node $node, FuncCall $funcCall, Expr $expr) : ?NotIdentical { if ($node instanceof Greater && $node->right instanceof LNumber && $node->right->value === 0) { $this->removeNode($funcCall); $this->removeNode($node->right); return new NotIdentical($expr, new Array_([])); } if ($node instanceof Smaller && $node->left instanceof LNumber && $node->left->value === 0) { $this->removeNode($funcCall); $this->removeNode($node->left); return new NotIdentical(new Array_([]), $expr); } return null; } private function processMarkTruthy(Node $node, FuncCall $funcCall, Expr $expr) : ?Expr { if (!$node instanceof If_ && !$node instanceof ElseIf_) { return null; } if ($node->cond === $funcCall) { $node->cond = new NotIdentical($expr, new Array_([])); return $node->cond; } return null; } }
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