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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\Empty_ as ExprEmpty; 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 ExprEmpty) { 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(); } } }