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<?php declare (strict_types=1); namespace Rector\CodeQuality\Rector\Identical; use PhpParser\Node; use PhpParser\Node\Arg; use PhpParser\Node\Expr; use PhpParser\Node\Expr\BinaryOp\Identical; use PhpParser\Node\Expr\FuncCall; use PhpParser\Node\Scalar\String_; use PHPStan\Type\StringType; use Rector\Core\NodeAnalyzer\ArgsAnalyzer; use Rector\Core\Rector\AbstractRector; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @see \Rector\Tests\CodeQuality\Rector\Identical\StrlenZeroToIdenticalEmptyStringRector\StrlenZeroToIdenticalEmptyStringRectorTest */ final class StrlenZeroToIdenticalEmptyStringRector extends AbstractRector { /** * @readonly * @var \Rector\Core\NodeAnalyzer\ArgsAnalyzer */ private $argsAnalyzer; public function __construct(ArgsAnalyzer $argsAnalyzer) { $this->argsAnalyzer = $argsAnalyzer; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Changes strlen comparison to 0 to direct empty string compare', [new CodeSample(<<<'CODE_SAMPLE' class SomeClass { public function run(string $value) { $empty = strlen($value) === 0; } } CODE_SAMPLE , <<<'CODE_SAMPLE' class SomeClass { public function run(string $value) { $empty = $value === ''; } } CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [Identical::class]; } /** * @param Identical $node */ public function refactor(Node $node) : ?Node { if ($node->left instanceof FuncCall) { return $this->processIdentical($node->right, $node->left); } if ($node->right instanceof FuncCall) { return $this->processIdentical($node->left, $node->right); } return null; } private function processIdentical(Expr $expr, FuncCall $funcCall) : ?Identical { if (!$this->isName($funcCall, 'strlen')) { return null; } if (!$this->valueResolver->isValue($expr, 0)) { return null; } if (!$this->argsAnalyzer->isArgInstanceInArgsPosition($funcCall->args, 0)) { return null; } /** @var Arg $firstArg */ $firstArg = $funcCall->args[0]; /** @var Expr $variable */ $variable = $firstArg->value; // Needs string cast if variable type is not string // see https://github.com/rectorphp/rector/issues/6700 $isStringType = $this->nodeTypeResolver->getNativeType($variable) instanceof StringType; if (!$isStringType) { return new Identical(new Expr\Cast\String_($variable), new String_('')); } return new Identical($variable, new String_('')); } }
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