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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2026 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\Name;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Namespace_;
use Psy\Exception\FatalErrorException;
/**
* Validate that the constructor method is not static, and does not have a
* return type.
*
* Checks both explicit __construct methods as well as old-style constructor
* methods with the same name as the class (for non-namespaced classes).
*
* As of PHP 5.3.3, methods with the same name as the last element of a
* namespaced class name will no longer be treated as constructor. This change
* doesn't affect non-namespaced classes.
*
* @author Martin HasoĊ <martin.hason@gmail.com>
*/
class ValidConstructorPass extends CodeCleanerPass
{
private array $namespace = [];
/**
* @return Node[]|null Array of nodes
*/
public function beforeTraverse(array $nodes)
{
$this->namespace = [];
return null;
}
/**
* Validate that the constructor is not static and does not have a return type.
*
* @throws FatalErrorException the constructor function is static
* @throws FatalErrorException the constructor function has a return type
*
* @param Node $node
*
* @return int|Node|null Replacement node (or special return value)
*/
public function enterNode(Node $node)
{
if ($node instanceof Namespace_) {
$this->namespace = isset($node->name) ? $this->getParts($node->name) : [];
} elseif ($node instanceof Class_) {
$constructor = null;
foreach ($node->stmts as $stmt) {
if ($stmt instanceof ClassMethod) {
// If we find a new-style constructor, no need to look for the old-style
if (\property_exists($stmt, 'name') && \strtolower($stmt->name) === '__construct') {
$this->validateConstructor($stmt, $node);
return null;
}
// We found a possible old-style constructor (unless there is also a __construct method)
if (empty($this->namespace) && $node->name !== null && \property_exists($stmt, 'name') && \strtolower($node->name) === \strtolower($stmt->name)) {
$constructor = $stmt;
}
}
}
if ($constructor) {
$this->validateConstructor($constructor, $node);
}
}
return null;
}
/**
* @throws FatalErrorException the constructor function is static
* @throws FatalErrorException the constructor function has a return type
*
* @param Node $constructor
* @param Node $classNode
*/
private function validateConstructor(Node $constructor, Node $classNode)
{
if (\method_exists($constructor, 'isStatic') && $constructor->isStatic()) {
$msg = \sprintf(
'Constructor %s::%s() cannot be static',
\implode('\\', \array_merge($this->namespace, (array) $classNode->name->toString())),
\property_exists($constructor, 'name') ? $constructor->name : '__construct'
);
throw new FatalErrorException($msg, 0, \E_ERROR, null, $classNode->getStartLine());
}
if (\method_exists($constructor, 'getReturnType') && $constructor->getReturnType()) {
$msg = \sprintf(
'Constructor %s::%s() cannot declare a return type',
\implode('\\', \array_merge($this->namespace, (array) $classNode->name->toString())),
\property_exists($constructor, 'name') ? $constructor->name : '__construct'
);
throw new FatalErrorException($msg, 0, \E_ERROR, null, $classNode->getStartLine());
}
}
/**
* Backwards compatibility shim for PHP-Parser 4.x.
*
* At some point we might want to make $namespace a plain string, to match how Name works?
*/
protected function getParts(Name $name): array
{
return \method_exists($name, 'getParts') ? $name->getParts() : $name->parts;
}
}