Chris@13: <?php
Chris@13: 
Chris@13: /*
Chris@13:  * This file is part of Psy Shell.
Chris@13:  *
Chris@13:  * (c) 2012-2018 Justin Hileman
Chris@13:  *
Chris@13:  * For the full copyright and license information, please view the LICENSE
Chris@13:  * file that was distributed with this source code.
Chris@13:  */
Chris@13: 
Chris@13: namespace Psy\CodeCleaner;
Chris@13: 
Chris@13: use PhpParser\Node;
Chris@13: use PhpParser\Node\Arg;
Chris@13: use PhpParser\Node\Expr\Include_;
Chris@13: use PhpParser\Node\Expr\StaticCall;
Chris@13: use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
Chris@13: use PhpParser\Node\Scalar\LNumber;
Chris@13: use Psy\Exception\ErrorException;
Chris@13: use Psy\Exception\FatalErrorException;
Chris@13: use Psy\Shell;
Chris@13: 
Chris@13: /**
Chris@13:  * Add runtime validation for `require` and `require_once` calls.
Chris@13:  */
Chris@13: class RequirePass extends CodeCleanerPass
Chris@13: {
Chris@13:     private static $requireTypes = [Include_::TYPE_REQUIRE, Include_::TYPE_REQUIRE_ONCE];
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public function enterNode(Node $origNode)
Chris@13:     {
Chris@13:         if (!$this->isRequireNode($origNode)) {
Chris@13:             return;
Chris@13:         }
Chris@13: 
Chris@13:         $node = clone $origNode;
Chris@13: 
Chris@13:         /*
Chris@13:          * rewrite
Chris@13:          *
Chris@13:          *   $foo = require $bar
Chris@13:          *
Chris@13:          * to
Chris@13:          *
Chris@13:          *   $foo = require \Psy\CodeCleaner\RequirePass::resolve($bar)
Chris@13:          */
Chris@13:         $node->expr = new StaticCall(
Chris@13:             new FullyQualifiedName('Psy\CodeCleaner\RequirePass'),
Chris@13:             'resolve',
Chris@13:             [new Arg($origNode->expr), new Arg(new LNumber($origNode->getLine()))],
Chris@13:             $origNode->getAttributes()
Chris@13:         );
Chris@13: 
Chris@13:         return $node;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * Runtime validation that $file can be resolved as an include path.
Chris@13:      *
Chris@13:      * If $file can be resolved, return $file. Otherwise throw a fatal error exception.
Chris@13:      *
Chris@13:      * @throws FatalErrorException when unable to resolve include path for $file
Chris@13:      * @throws ErrorException      if $file is empty and E_WARNING is included in error_reporting level
Chris@13:      *
Chris@13:      * @param string $file
Chris@13:      * @param int    $lineNumber Line number of the original require expression
Chris@13:      *
Chris@13:      * @return string Exactly the same as $file
Chris@13:      */
Chris@13:     public static function resolve($file, $lineNumber = null)
Chris@13:     {
Chris@13:         $file = (string) $file;
Chris@13: 
Chris@13:         if ($file === '') {
Chris@13:             // @todo Shell::handleError would be better here, because we could
Chris@13:             // fake the file and line number, but we can't call it statically.
Chris@13:             // So we're duplicating some of the logics here.
Chris@17:             if (E_WARNING & \error_reporting()) {
Chris@13:                 ErrorException::throwException(E_WARNING, 'Filename cannot be empty', null, $lineNumber);
Chris@13:             }
Chris@17:             // @todo trigger an error as fallback? this is pretty ugly…
Chris@17:             // trigger_error('Filename cannot be empty', E_USER_WARNING);
Chris@13:         }
Chris@13: 
Chris@17:         if ($file === '' || !\stream_resolve_include_path($file)) {
Chris@17:             $msg = \sprintf("Failed opening required '%s'", $file);
Chris@13:             throw new FatalErrorException($msg, 0, E_ERROR, null, $lineNumber);
Chris@13:         }
Chris@13: 
Chris@13:         return $file;
Chris@13:     }
Chris@13: 
Chris@13:     private function isRequireNode(Node $node)
Chris@13:     {
Chris@17:         return $node instanceof Include_ && \in_array($node->type, self::$requireTypes);
Chris@13:     }
Chris@13: }