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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\Expr;
use PhpParser\Node\Expr\Ternary;
use PhpParser\Node\Stmt;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\Do_;
use PhpParser\Node\Stmt\If_;
use PhpParser\Node\Stmt\Interface_;
use PhpParser\Node\Stmt\Switch_;
use PhpParser\Node\Stmt\Trait_;
use PhpParser\Node\Stmt\While_;
use Psy\Exception\FatalErrorException;
/**
* Validate that classes exist.
*
* This pass throws a FatalErrorException rather than letting PHP run
* headfirst into a real fatal error and die.
*/
class ValidClassNamePass extends NamespaceAwarePass
{
const CLASS_TYPE = 'class';
const INTERFACE_TYPE = 'interface';
const TRAIT_TYPE = 'trait';
private int $conditionalScopes = 0;
/**
* Validate class, interface and trait definitions.
*
* Validate them upon entering the node, so that we know about their
* presence and can validate constant fetches and static calls in class or
* trait methods.
*
* @param Node $node
*
* @return int|Node|null Replacement node (or special return value)
*/
public function enterNode(Node $node)
{
parent::enterNode($node);
if (self::isConditional($node)) {
$this->conditionalScopes++;
return null;
}
if ($this->conditionalScopes === 0) {
if ($node instanceof Class_) {
$this->validateClassStatement($node);
} elseif ($node instanceof Interface_) {
$this->validateInterfaceStatement($node);
} elseif ($node instanceof Trait_) {
$this->validateTraitStatement($node);
}
}
return null;
}
/**
* @param Node $node
*
* @return int|Node|Node[]|null Replacement node (or special return value)
*/
public function leaveNode(Node $node)
{
if (self::isConditional($node)) {
$this->conditionalScopes--;
}
return null;
}
private static function isConditional(Node $node): bool
{
return $node instanceof If_ ||
$node instanceof While_ ||
$node instanceof Do_ ||
$node instanceof Switch_ ||
$node instanceof Ternary;
}
/**
* Validate a class definition statement.
*
* @param Class_ $stmt
*/
protected function validateClassStatement(Class_ $stmt)
{
$this->ensureCanDefine($stmt, self::CLASS_TYPE);
if (isset($stmt->extends)) {
$this->ensureClassExists($this->getFullyQualifiedName($stmt->extends), $stmt);
}
$this->ensureInterfacesExist($stmt->implements, $stmt);
}
/**
* Validate an interface definition statement.
*
* @param Interface_ $stmt
*/
protected function validateInterfaceStatement(Interface_ $stmt)
{
$this->ensureCanDefine($stmt, self::INTERFACE_TYPE);
$this->ensureInterfacesExist($stmt->extends, $stmt);
}
/**
* Validate a trait definition statement.
*
* @param Trait_ $stmt
*/
protected function validateTraitStatement(Trait_ $stmt)
{
$this->ensureCanDefine($stmt, self::TRAIT_TYPE);
}
/**
* Ensure that no class, interface or trait name collides with a new definition.
*
* @throws FatalErrorException
*
* @param Stmt $stmt
* @param string $scopeType
*/
protected function ensureCanDefine(Stmt $stmt, string $scopeType = self::CLASS_TYPE)
{
// Anonymous classes don't have a name, and uniqueness shouldn't be enforced.
if (!\property_exists($stmt, 'name') || $stmt->name === null) {
return;
}
$name = $this->getFullyQualifiedName($stmt->name);
// check for name collisions
$errorType = null;
if ($this->classExists($name)) {
$errorType = self::CLASS_TYPE;
} elseif ($this->interfaceExists($name)) {
$errorType = self::INTERFACE_TYPE;
} elseif ($this->traitExists($name)) {
$errorType = self::TRAIT_TYPE;
}
if ($errorType !== null) {
throw $this->createError(\sprintf('%s named %s already exists', \ucfirst($errorType), $name), $stmt);
}
// Store creation for the rest of this code snippet so we can find local
// issue too
$this->currentScope[\strtolower($name)] = $scopeType;
}
/**
* Ensure that a referenced class exists.
*
* @throws FatalErrorException
*
* @param string $name
* @param Stmt $stmt
*/
protected function ensureClassExists(string $name, Stmt $stmt)
{
if (!$this->classExists($name)) {
throw $this->createError(\sprintf('Class \'%s\' not found', $name), $stmt);
}
}
/**
* Ensure that a referenced class _or interface_ exists.
*
* @throws FatalErrorException
*
* @param string $name
* @param Stmt $stmt
*/
protected function ensureClassOrInterfaceExists(string $name, Stmt $stmt)
{
if (!$this->classExists($name) && !$this->interfaceExists($name)) {
throw $this->createError(\sprintf('Class \'%s\' not found', $name), $stmt);
}
}
/**
* Ensure that a referenced class _or trait_ exists.
*
* @throws FatalErrorException
*
* @param string $name
* @param Stmt $stmt
*/
protected function ensureClassOrTraitExists(string $name, Stmt $stmt)
{
if (!$this->classExists($name) && !$this->traitExists($name)) {
throw $this->createError(\sprintf('Class \'%s\' not found', $name), $stmt);
}
}
/**
* Ensure that a statically called method exists.
*
* @throws FatalErrorException
*
* @param string $class
* @param string $name
* @param Stmt $stmt
*/
protected function ensureMethodExists(string $class, string $name, Stmt $stmt)
{
$this->ensureClassOrTraitExists($class, $stmt);
// let's pretend all calls to self, parent and static are valid
if (\in_array(\strtolower($class), ['self', 'parent', 'static'])) {
return;
}
// ... and all calls to classes defined right now
if ($this->findInScope($class) === self::CLASS_TYPE) {
return;
}
// if method name is an expression, give it a pass for now
if ($name instanceof Expr) {
return;
}
if (!\method_exists($class, $name) && !\method_exists($class, '__callStatic')) {
throw $this->createError(\sprintf('Call to undefined method %s::%s()', $class, $name), $stmt);
}
}
/**
* Ensure that a referenced interface exists.
*
* @throws FatalErrorException
*
* @param Interface_[] $interfaces
* @param Stmt $stmt
*/
protected function ensureInterfacesExist(array $interfaces, Stmt $stmt)
{
foreach ($interfaces as $interface) {
/** @var string $name */
$name = $this->getFullyQualifiedName($interface);
if (!$this->interfaceExists($name)) {
throw $this->createError(\sprintf('Interface \'%s\' not found', $name), $stmt);
}
}
}
/**
* Check whether a class exists, or has been defined in the current code snippet.
*
* Gives `self`, `static` and `parent` a free pass.
*
* @param string $name
*/
protected function classExists(string $name): bool
{
// Give `self`, `static` and `parent` a pass. This will actually let
// some errors through, since we're not checking whether the keyword is
// being used in a class scope.
if (\in_array(\strtolower($name), ['self', 'static', 'parent'])) {
return true;
}
return \class_exists($name) || $this->findInScope($name) === self::CLASS_TYPE;
}
/**
* Check whether an interface exists, or has been defined in the current code snippet.
*
* @param string $name
*/
protected function interfaceExists(string $name): bool
{
return \interface_exists($name) || $this->findInScope($name) === self::INTERFACE_TYPE;
}
/**
* Check whether a trait exists, or has been defined in the current code snippet.
*
* @param string $name
*/
protected function traitExists(string $name): bool
{
return \trait_exists($name) || $this->findInScope($name) === self::TRAIT_TYPE;
}
/**
* Find a symbol in the current code snippet scope.
*
* @param string $name
*
* @return string|null
*/
protected function findInScope(string $name)
{
$name = \strtolower($name);
if (isset($this->currentScope[$name])) {
return $this->currentScope[$name];
}
return null;
}
/**
* Error creation factory.
*
* @param string $msg
* @param Stmt $stmt
*/
protected function createError(string $msg, Stmt $stmt): FatalErrorException
{
return new FatalErrorException($msg, 0, \E_ERROR, null, $stmt->getStartLine());
}
}