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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2015 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\New_ as NewExpr;
use PhpParser\Node\Expr\StaticCall;
use PhpParser\Node\Stmt;
use PhpParser\Node\Stmt\Class_ as ClassStmt;
use PhpParser\Node\Stmt\Interface_ as InterfaceStmt;
use PhpParser\Node\Stmt\Trait_ as TraitStmt;
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';
protected $checkTraits;
public function __construct()
{
$this->checkTraits = function_exists('trait_exists');
}
/**
* 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
*/
public function enterNode(Node $node)
{
parent::enterNode($node);
if ($node instanceof ClassStmt) {
$this->validateClassStatement($node);
} elseif ($node instanceof InterfaceStmt) {
$this->validateInterfaceStatement($node);
} elseif ($node instanceof TraitStmt) {
$this->validateTraitStatement($node);
}
}
/**
* Validate `new` expressions, class constant fetches, and static calls.
*
* @throws FatalErrorException if a class, interface or trait is referenced which does not exist.
* @throws FatalErrorException if a class extends something that is not a class.
* @throws FatalErrorException if a class implements something that is not an interface.
* @throws FatalErrorException if an interface extends something that is not an interface.
* @throws FatalErrorException if a class, interface or trait redefines an existing class, interface or trait name.
*
* @param Node $node
*/
public function leaveNode(Node $node)
{
if ($node instanceof NewExpr) {
$this->validateNewExpression($node);
} elseif ($node instanceof ClassConstFetch) {
$this->validateClassConstFetchExpression($node);
} elseif ($node instanceof StaticCall) {
$this->validateStaticCallExpression($node);
}
}
/**
* Validate a class definition statement.
*
* @param ClassStmt $stmt
*/
protected function validateClassStatement(ClassStmt $stmt)
{
$this->ensureCanDefine($stmt);
if (isset($stmt->extends)) {
$this->ensureClassExists($this->getFullyQualifiedName($stmt->extends), $stmt);
}
$this->ensureInterfacesExist($stmt->implements, $stmt);
}
/**
* Validate an interface definition statement.
*
* @param InterfaceStmt $stmt
*/
protected function validateInterfaceStatement(InterfaceStmt $stmt)
{
$this->ensureCanDefine($stmt);
$this->ensureInterfacesExist($stmt->extends, $stmt);
}
/**
* Validate a trait definition statement.
*
* @param TraitStmt $stmt
*/
protected function validateTraitStatement(TraitStmt $stmt)
{
$this->ensureCanDefine($stmt);
}
/**
* Validate a `new` expression.
*
* @param NewExpr $stmt
*/
protected function validateNewExpression(NewExpr $stmt)
{
// if class name is an expression or an anonymous class, give it a pass for now
if (!$stmt->class instanceof Expr && !$stmt->class instanceof ClassStmt) {
$this->ensureClassExists($this->getFullyQualifiedName($stmt->class), $stmt);
}
}
/**
* Validate a class constant fetch expression's class.
*
* @param ClassConstFetch $stmt
*/
protected function validateClassConstFetchExpression(ClassConstFetch $stmt)
{
// there is no need to check exists for ::class const for php 5.5 or newer
if (strtolower($stmt->name) === 'class'
&& version_compare(PHP_VERSION, '5.5', '>=')) {
return;
}
// if class name is an expression, give it a pass for now
if (!$stmt->class instanceof Expr) {
$this->ensureClassOrInterfaceExists($this->getFullyQualifiedName($stmt->class), $stmt);
}
}
/**
* Validate a class constant fetch expression's class.
*
* @param StaticCall $stmt
*/
protected function validateStaticCallExpression(StaticCall $stmt)
{
// if class name is an expression, give it a pass for now
if (!$stmt->class instanceof Expr) {
$this->ensureMethodExists($this->getFullyQualifiedName($stmt->class), $stmt->name, $stmt);
}
}
/**
* Ensure that no class, interface or trait name collides with a new definition.
*
* @throws FatalErrorException
*
* @param Stmt $stmt
*/
protected function ensureCanDefine(Stmt $stmt)
{
$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)] = $this->getScopeType($stmt);
}
/**
* Ensure that a referenced class exists.
*
* @throws FatalErrorException
*
* @param string $name
* @param Stmt $stmt
*/
protected function ensureClassExists($name, $stmt)
{
if (!$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 $stmt
*/
protected function ensureClassOrInterfaceExists($name, $stmt)
{
if (!$this->classExists($name) && !$this->interfaceExists($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 $stmt
*/
protected function ensureMethodExists($class, $name, $stmt)
{
$this->ensureClassExists($class, $stmt);
// let's pretend all calls to self, parent and static are valid
if (in_array(strtolower($class), array('self', 'parent', 'static'))) {
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 $interfaces
* @param Stmt $stmt
*/
protected function ensureInterfacesExist($interfaces, $stmt)
{
foreach ($interfaces as $interface) {
/** @var string $name */
$name = $this->getFullyQualifiedName($interface);
if (!$this->interfaceExists($name)) {
throw $this->createError(sprintf('Interface \'%s\' not found', $name), $stmt);
}
}
}
/**
* Get a symbol type key for storing in the scope name cache.
*
* @param Stmt $stmt
*
* @return string
*/
protected function getScopeType(Stmt $stmt)
{
if ($stmt instanceof ClassStmt) {
return self::CLASS_TYPE;
} elseif ($stmt instanceof InterfaceStmt) {
return self::INTERFACE_TYPE;
} elseif ($stmt instanceof TraitStmt) {
return self::TRAIT_TYPE;
}
}
/**
* Check whether a class exists, or has been defined in the current code snippet.
*
* Gives `self`, `static` and `parent` a free pass.
*
* @param string $name
*
* @return bool
*/
protected function classExists($name)
{
// 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($name), array('self', 'static', 'parent'))) {
return true;
}
return class_exists($name) || $this->findInScope($name) === self::CLASS_TYPE;
}
/**
* Check whether an interface exists, or has been defined in the current code snippet.
*
* @param string $name
*
* @return bool
*/
protected function interfaceExists($name)
{
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 $name
*
* @return bool
*/
protected function traitExists($name)
{
return $this->checkTraits && (trait_exists($name) || $this->findInScope($name) === self::TRAIT_TYPE);
}
/**
* Find a symbol in the current code snippet scope.
*
* @param string $name
*
* @return string|null
*/
protected function findInScope($name)
{
$name = strtolower($name);
if (isset($this->currentScope[$name])) {
return $this->currentScope[$name];
}
}
/**
* Error creation factory.
*
* @param string $msg
* @param Stmt $stmt
*
* @return FatalErrorException
*/
protected function createError($msg, $stmt)
{
return new FatalErrorException($msg, 0, 1, null, $stmt->getLine());
}
}