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<?php declare (strict_types=1); namespace Rector\CodeQuality\Rector\If_; use RectorPrefix202208\Nette\Utils\Strings; use PhpParser\Node; use PhpParser\Node\Expr; use PhpParser\Node\Expr\Assign; use PhpParser\Node\Expr\Ternary; use PhpParser\Node\Stmt; use PhpParser\Node\Stmt\Expression; use PhpParser\Node\Stmt\If_; use Rector\Core\Contract\PhpParser\NodePrinterInterface; use Rector\Core\Rector\AbstractRector; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @see \Rector\Tests\CodeQuality\Rector\If_\SimplifyIfElseToTernaryRector\SimplifyIfElseToTernaryRectorTest */ final class SimplifyIfElseToTernaryRector extends AbstractRector { /** * @var int */ private const LINE_LENGTH_LIMIT = 120; /** * @readonly * @var \Rector\Core\Contract\PhpParser\NodePrinterInterface */ private $nodePrinter; public function __construct(NodePrinterInterface $nodePrinter) { $this->nodePrinter = $nodePrinter; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Changes if/else for same value as assign to ternary', [new CodeSample(<<<'CODE_SAMPLE' class SomeClass { public function run() { if (empty($value)) { $this->arrayBuilt[][$key] = true; } else { $this->arrayBuilt[][$key] = $value; } } } CODE_SAMPLE , <<<'CODE_SAMPLE' class SomeClass { public function run() { $this->arrayBuilt[][$key] = empty($value) ? true : $value; } } CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [If_::class]; } /** * @param If_ $node */ public function refactor(Node $node) : ?Node { if ($node->else === null) { return null; } if ($node->elseifs !== []) { return null; } $ifAssignVar = $this->resolveOnlyStmtAssignVar($node->stmts); if (!$ifAssignVar instanceof Expr) { return null; } $elseAssignVar = $this->resolveOnlyStmtAssignVar($node->else->stmts); if (!$elseAssignVar instanceof Expr) { return null; } if (!$this->nodeComparator->areNodesEqual($ifAssignVar, $elseAssignVar)) { return null; } $ternaryIf = $this->resolveOnlyStmtAssignExpr($node->stmts); $ternaryElse = $this->resolveOnlyStmtAssignExpr($node->else->stmts); if (!$ternaryIf instanceof Expr) { return null; } if (!$ternaryElse instanceof Expr) { return null; } // has nested ternary → skip, it's super hard to read if ($this->haveNestedTernary([$node->cond, $ternaryIf, $ternaryElse])) { return null; } $ternary = new Ternary($node->cond, $ternaryIf, $ternaryElse); $assign = new Assign($ifAssignVar, $ternary); // do not create super long lines if ($this->isNodeTooLong($assign)) { return null; } $expression = new Expression($assign); $this->mirrorComments($expression, $node); return $expression; } /** * @param Stmt[] $stmts */ private function resolveOnlyStmtAssignVar(array $stmts) : ?Expr { if (\count($stmts) !== 1) { return null; } $stmt = $stmts[0]; if (!$stmt instanceof Expression) { return null; } $stmtExpr = $stmt->expr; if (!$stmtExpr instanceof Assign) { return null; } return $stmtExpr->var; } /** * @param Stmt[] $stmts */ private function resolveOnlyStmtAssignExpr(array $stmts) : ?Expr { if (\count($stmts) !== 1) { return null; } $stmt = $stmts[0]; if (!$stmt instanceof Expression) { return null; } $stmtExpr = $stmt->expr; if (!$stmtExpr instanceof Assign) { return null; } return $stmtExpr->expr; } /** * @param Node[] $nodes */ private function haveNestedTernary(array $nodes) : bool { foreach ($nodes as $node) { $betterNodeFinderFindInstanceOf = $this->betterNodeFinder->findInstanceOf($node, Ternary::class); if ($betterNodeFinderFindInstanceOf !== []) { return \true; } } return \false; } private function isNodeTooLong(Assign $assign) : bool { $assignContent = $this->nodePrinter->print($assign); return Strings::length($assignContent) > self::LINE_LENGTH_LIMIT; } }
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