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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2017 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\Empty_;
use PhpParser\Node\Expr\Variable;
use Psy\Exception\ParseErrorException;
/**
* Validate that the user did not call the language construct `empty()` on a
* statement in PHP < 5.5.
*/
class LegacyEmptyPass extends CodeCleanerPass
{
/**
* Validate use of empty in PHP < 5.5.
*
* @throws ParseErrorException if the user used empty with anything but a variable
*
* @param Node $node
*/
public function enterNode(Node $node)
{
if (version_compare(PHP_VERSION, '5.5', '>=')) {
return;
}
if (!$node instanceof Empty_) {
return;
}
if (!$node->expr instanceof Variable) {
$msg = sprintf('syntax error, unexpected %s', $this->getUnexpectedThing($node->expr));
throw new ParseErrorException($msg, $node->expr->getLine());
}
}
private function getUnexpectedThing(Node $node)
{
switch ($node->getType()) {
case 'Scalar_String':
case 'Scalar_LNumber':
case 'Scalar_DNumber':
return json_encode($node->value);
case 'Expr_ConstFetch':
return (string) $node->name;
default:
return $node->getType();
}
}
}