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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\Scalar\LNumber; use PhpParser\Node\Stmt\Declare_ as DeclareStmt; use PhpParser\Node\Stmt\DeclareDeclare; use Psy\Exception\FatalErrorException; /** * Provide implicit strict types declarations for for subsequent execution. * * The strict types pass remembers the last strict types declaration: * * declare(strict_types=1); * * ... which it then applies implicitly to all future evaluated code, until it * is replaced by a new declaration. */ class StrictTypesPass extends CodeCleanerPass { private $strictTypes = false; /** * If this is a standalone strict types declaration, remember it for later. * * Otherwise, apply remembered strict types declaration to to the code until * a new declaration is encountered. * * @throws FatalErrorException if an invalid `strict_types` declaration is found. * * @param array $nodes */ public function beforeTraverse(array $nodes) { if (version_compare(PHP_VERSION, '7.0', '<')) { return; } $prependStrictTypes = $this->strictTypes; foreach ($nodes as $key => $node) { if ($node instanceof DeclareStmt) { foreach ($node->declares as $declare) { if ($declare->key === 'strict_types') { $value = $declare->value; if (!$value instanceof LNumber || ($value->value !== 0 && $value->value !== 1)) { throw new FatalErrorException('strict_types declaration must have 0 or 1 as its value'); } $this->strictTypes = $value->value === 1; } } } } if ($prependStrictTypes) { $first = reset($nodes); if (!$first instanceof DeclareStmt) { $declare = new DeclareStmt(array(new DeclareDeclare('strict_types', new LNumber(1)))); array_unshift($nodes, $declare); } } return $nodes; } }