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<?php
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/*
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* This file is part of Psy Shell.
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*
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* (c) 2012-2022 Justin Hileman
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Psy\CodeCleaner;
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use PhpParser\Node;
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use PhpParser\Node\Expr\Array_;
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use PhpParser\Node\Expr\BinaryOp;
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use PhpParser\Node\Expr\ClassConstFetch;
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use PhpParser\Node\Expr\ConstFetch;
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use PhpParser\Node\Expr\Instanceof_;
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use PhpParser\Node\Scalar;
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use PhpParser\Node\Scalar\Encapsed;
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use Psy\Exception\FatalErrorException;
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/**
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* Validate that the instanceof statement does not receive a scalar value or a non-class constant.
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*
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* @author Martin Hasoň <martin.hason@gmail.com>
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*/
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class InstanceOfPass extends CodeCleanerPass
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{
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const EXCEPTION_MSG = 'instanceof expects an object instance, constant given';
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private $atLeastPhp73;
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public function __construct()
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{
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$this->atLeastPhp73 = \version_compare(\PHP_VERSION, '7.3', '>=');
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}
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/**
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* Validate that the instanceof statement does not receive a scalar value or a non-class constant.
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*
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* @throws FatalErrorException if a scalar or a non-class constant is given
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*
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* @param Node $node
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*
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* @return int|Node|null Replacement node (or special return value)
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*/
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public function enterNode(Node $node)
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{
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// Basically everything is allowed in PHP 7.3 :)
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if ($this->atLeastPhp73) {
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return;
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}
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if (!$node instanceof Instanceof_) {
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return;
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}
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if (($node->expr instanceof Scalar && !$node->expr instanceof Encapsed) ||
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$node->expr instanceof BinaryOp ||
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$node->expr instanceof Array_ ||
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$node->expr instanceof ConstFetch ||
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$node->expr instanceof ClassConstFetch
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) {
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throw new FatalErrorException(self::EXCEPTION_MSG, 0, \E_ERROR, null, $node->getLine());
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}
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}
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}
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