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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2020 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_;
use PhpParser\Node\Expr\BinaryOp;
use PhpParser\Node\Expr\ClassConstFetch;
use PhpParser\Node\Expr\ConstFetch;
use PhpParser\Node\Expr\Instanceof_;
use PhpParser\Node\Scalar;
use PhpParser\Node\Scalar\Encapsed;
use Psy\Exception\FatalErrorException;
/**
* Validate that the instanceof statement does not receive a scalar value or a non-class constant.
*
* @author Martin Hasoň <martin.hason@gmail.com>
*/
class InstanceOfPass extends CodeCleanerPass
{
const EXCEPTION_MSG = 'instanceof expects an object instance, constant given';
private $atLeastPhp73;
public function __construct()
{
$this->atLeastPhp73 = \version_compare(\PHP_VERSION, '7.3', '>=');
}
/**
* Validate that the instanceof statement does not receive a scalar value or a non-class constant.
*
* @throws FatalErrorException if a scalar or a non-class constant is given
*
* @param Node $node
*/
public function enterNode(Node $node)
{
// Basically everything is allowed in PHP 7.3 :)
if ($this->atLeastPhp73) {
return;
}
if (!$node instanceof Instanceof_) {
return;
}
if (($node->expr instanceof Scalar && !$node->expr instanceof Encapsed) ||
$node->expr instanceof BinaryOp ||
$node->expr instanceof Array_ ||
$node->expr instanceof ConstFetch ||
$node->expr instanceof ClassConstFetch
) {
throw new FatalErrorException(self::EXCEPTION_MSG, 0, \E_ERROR, null, $node->getLine());
}
}
}