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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2022 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\ConstFetch;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Name;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\Trait_;
use PhpParser\Node\VariadicPlaceholder;
use Psy\Exception\ErrorException;
/**
* The called class pass throws warnings for get_class() and get_called_class()
* outside a class context.
*/
class CalledClassPass extends CodeCleanerPass
{
private $inClass;
/**
* @param array $nodes
*
* @return Node[]|null Array of nodes
*/
public function beforeTraverse(array $nodes)
{
$this->inClass = false;
}
/**
* @throws ErrorException if get_class or get_called_class is called without an object from outside a class
*
* @param Node $node
*
* @return int|Node|null Replacement node (or special return value)
*/
public function enterNode(Node $node)
{
if ($node instanceof Class_ || $node instanceof Trait_) {
$this->inClass = true;
} elseif ($node instanceof FuncCall && !$this->inClass) {
// We'll give any args at all (besides null) a pass.
// Technically we should be checking whether the args are objects, but this will do for now.
//
// @todo switch this to actually validate args when we get context-aware code cleaner passes.
if (!empty($node->args) && !$this->isNull($node->args[0])) {
return;
}
// We'll ignore name expressions as well (things like `$foo()`)
if (!($node->name instanceof Name)) {
return;
}
$name = \strtolower($node->name);
if (\in_array($name, ['get_class', 'get_called_class'])) {
$msg = \sprintf('%s() called without object from outside a class', $name);
throw new ErrorException($msg, 0, \E_USER_WARNING, null, $node->getLine());
}
}
}
/**
* @param Node $node
*
* @return int|Node|Node[]|null Replacement node (or special return value)
*/
public function leaveNode(Node $node)
{
if ($node instanceof Class_) {
$this->inClass = false;
}
}
private function isNull(Node $node): bool
{
if ($node instanceof VariadicPlaceholder) {
return false;
}
return $node->value instanceof ConstFetch && \strtolower($node->value->name) === 'null';
}
}
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