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<?php /* * This file is part of Psy Shell. * * (c) 2012-2015 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Psy\CodeCleaner; use PhpParser\Node; use PhpParser\Node\Expr\Array_ as ArrayNode; use PhpParser\Node\Expr\Assign as AssignNode; use PhpParser\Node\Expr\Empty_ as EmptyNode; use PhpParser\Node\Expr\FuncCall as FunctionCall; use PhpParser\Node\Expr\Isset_ as IssetNode; use PhpParser\Node\Expr\MethodCall; use PhpParser\Node\Expr\StaticCall; use Psy\Exception\FatalErrorException; /** * Validate that the functions are used correctly. * * @author Martin Hasoň <martin.hason@gmail.com> */ class FunctionReturnInWriteContextPass extends CodeCleanerPass { const EXCEPTION_MESSAGE = "Can't use function return value in write context"; private $isPhp55; public function __construct() { $this->isPhp55 = version_compare(PHP_VERSION, '5.5', '>='); } /** * Validate that the functions are used correctly. * * @throws FatalErrorException if a function is passed as an argument reference * @throws FatalErrorException if a function is used as an argument in the isset * @throws FatalErrorException if a function is used as an argument in the empty, only for PHP < 5.5 * @throws FatalErrorException if a value is assigned to a function * * @param Node $node */ public function enterNode(Node $node) { if ($node instanceof ArrayNode || $this->isCallNode($node)) { $items = $node instanceof ArrayNode ? $node->items : $node->args; foreach ($items as $item) { if ($item->byRef && $this->isCallNode($item->value)) { throw new FatalErrorException(self::EXCEPTION_MESSAGE); } } } elseif ($node instanceof IssetNode) { foreach ($node->vars as $var) { if (!$this->isCallNode($var)) { continue; } if ($this->isPhp55) { throw new FatalErrorException('Cannot use isset() on the result of a function call (you can use "null !== func()" instead)'); } else { throw new FatalErrorException(self::EXCEPTION_MESSAGE); } } } elseif ($node instanceof EmptyNode && !$this->isPhp55 && $this->isCallNode($node->expr)) { throw new FatalErrorException(self::EXCEPTION_MESSAGE); } elseif ($node instanceof AssignNode && $this->isCallNode($node->var)) { throw new FatalErrorException(self::EXCEPTION_MESSAGE); } } private function isCallNode(Node $node) { return $node instanceof FunctionCall || $node instanceof MethodCall || $node instanceof StaticCall; } }