Current File : /var/www/html/news/vendor/psy/psysh/src/Psy/CodeCleaner/PassableByReferencePass.php
<?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;
use PhpParser\Node\Expr\ClassConstFetch;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Expr\MethodCall;
use PhpParser\Node\Expr\PropertyFetch;
use PhpParser\Node\Expr\StaticCall;
use PhpParser\Node\Expr\Variable;
use Psy\Exception\FatalErrorException;
/**
* Validate that only variables (and variable-like things) are passed by reference.
*/
class PassableByReferencePass extends CodeCleanerPass
{
const EXCEPTION_MESSAGE = 'Only variables can be passed by reference';
/**
* @throws FatalErrorException if non-variables are passed by reference
*
* @param Node $node
*/
public function enterNode(Node $node)
{
// TODO: support MethodCall and StaticCall as well.
if ($node instanceof FuncCall) {
$name = $node->name;
// if function name is an expression or a variable, give it a pass for now.
if ($name instanceof Expr || $name instanceof Variable) {
return;
}
try {
$refl = new \ReflectionFunction(implode('\\', $name->parts));
} catch (\ReflectionException $e) {
// Well, we gave it a shot!
return;
}
foreach ($refl->getParameters() as $key => $param) {
if (array_key_exists($key, $node->args)) {
$arg = $node->args[$key];
if ($param->isPassedByReference() && !$this->isPassableByReference($arg)) {
throw new FatalErrorException(self::EXCEPTION_MESSAGE);
}
}
}
}
}
private function isPassableByReference(Node $arg)
{
// FuncCall, MethodCall and StaticCall are all PHP _warnings_ not fatal errors, so we'll let
// PHP handle those ones :)
return $arg->value instanceof ClassConstFetch ||
$arg->value instanceof PropertyFetch ||
$arg->value instanceof Variable ||
$arg->value instanceof FuncCall ||
$arg->value instanceof MethodCall ||
$arg->value instanceof StaticCall;
}
}
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