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psalm/src/Psalm/Checker/ClassLikeChecker.php

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<?php
namespace Psalm\Checker;
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use Psalm\Issue\InvalidClass;
use Psalm\Issue\UndefinedClass;
use Psalm\Issue\UndefinedTrait;
use Psalm\IssueBuffer;
use Psalm\Context;
use Psalm\Config;
use Psalm\Type;
use Psalm\StatementsSource;
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use PhpParser;
use PhpParser\Error;
use PhpParser\ParserFactory;
use ReflectionClass;
use ReflectionException;
use ReflectionMethod;
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use ReflectionProperty;
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abstract class ClassLikeChecker implements StatementsSource
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{
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protected static $SPECIAL_TYPES = ['int', 'string', 'float', 'bool', 'false', 'object', 'empty', 'callable', 'array'];
protected $file_name;
protected $class;
protected $namespace;
protected $aliased_classes;
protected $absolute_class;
protected $has_custom_get = false;
protected $source;
/** @var string|null */
protected $parent_class;
/**
* @var array
*/
protected $suppressed_issues;
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/**
* @var array<ClassMethodChecker>
*/
protected static $method_checkers = [];
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protected static $this_class = null;
protected static $class_methods = [];
protected static $class_checkers = [];
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protected static $public_class_properties = [];
protected static $protected_class_properties = [];
protected static $private_class_properties = [];
protected static $public_static_class_properties = [];
protected static $protected_static_class_properties = [];
protected static $private_static_class_properties = [];
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protected static $public_class_constants = [];
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protected static $registered_classes = [];
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protected static $class_implements = [];
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public function __construct(PhpParser\Node\Stmt\ClassLike $class, StatementsSource $source, $absolute_class)
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{
$this->class = $class;
$this->namespace = $source->getNamespace();
$this->aliased_classes = $source->getAliasedClasses();
$this->file_name = $source->getFileName();
$this->absolute_class = $absolute_class;
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$this->suppressed_issues = $source->getSuppressedIssues();
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if (self::$this_class) {
self::$class_checkers[$absolute_class] = $this;
}
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}
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public function check($check_methods = true, Context $class_context = null)
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{
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if (!$check_methods && !($this instanceof TraitChecker) && isset(self::$registered_classes[$this->absolute_class])) {
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return;
}
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$config = Config::getInstance();
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self::$registered_classes[$this->absolute_class] = true;
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$leftover_stmts = [];
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$method_checkers = [];
self::$class_methods[$this->absolute_class] = [];
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self::$public_class_properties[$this->absolute_class] = [];
self::$protected_class_properties[$this->absolute_class] = [];
self::$private_class_properties[$this->absolute_class] = [];
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self::$public_static_class_properties[$this->absolute_class] = [];
self::$protected_static_class_properties[$this->absolute_class] = [];
self::$private_static_class_properties[$this->absolute_class] = [];
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self::$public_class_constants[$this->absolute_class] = [];
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if (!$class_context) {
$class_context = new Context($this->file_name, $this->absolute_class);
$class_context->parent = $this->parent_class;
$class_context->vars_in_scope['this'] = new Type\Union([new Type\Atomic($this->absolute_class)]);
}
// set all constants first
foreach ($this->class->stmts as $stmt) {
if ($stmt instanceof PhpParser\Node\Stmt\ClassConst) {
foreach ($stmt->consts as $const) {
self::$public_class_constants[$class_context->self][$const->name] = Type::getMixed();
}
}
}
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if ($this instanceof ClassChecker) {
if ($this->parent_class) {
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if (self::checkAbsoluteClassOrInterface(
$this->parent_class,
$this->file_name,
$this->class->getLine(),
$this->getSuppressedIssues()
) === false
) {
return false;
}
self::registerClass($this->parent_class);
$this->registerInheritedMethods($this->parent_class);
self::$class_implements[$this->absolute_class] += self::$class_implements[$this->parent_class];
self::$public_class_properties[$this->absolute_class] = self::$public_class_properties[$this->parent_class];
self::$protected_class_properties[$this->absolute_class] = self::$protected_class_properties[$this->parent_class];
self::$public_static_class_properties[$this->absolute_class] = self::$public_static_class_properties[$this->parent_class];
self::$protected_static_class_properties[$this->absolute_class] = self::$protected_static_class_properties[$this->parent_class];
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self::$public_class_constants[$this->absolute_class] = array_merge(
self::$public_class_constants[$this->parent_class],
self::$public_class_constants[$this->absolute_class]
);
}
foreach (self::$class_implements[$this->absolute_class] as $interface_name => $_) {
if (self::checkAbsoluteClassOrInterface(
$interface_name,
$this->file_name,
$this->class->getLine(),
$this->getSuppressedIssues()
) === false
) {
return false;
}
self::registerClass($interface_name);
}
foreach (ClassChecker::getInterfacesForClass($this->absolute_class) as $interface_name => $_) {
self::$public_class_constants[$this->absolute_class] += self::$public_class_constants[$interface_name];
}
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}
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$trait_checkers = [];
foreach ($this->class->stmts as $stmt) {
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if ($stmt instanceof PhpParser\Node\Stmt\ClassMethod) {
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$method_id = $this->absolute_class . '::' . strtolower($stmt->name);
if (!isset(self::$method_checkers[$method_id])) {
$method_checker = new ClassMethodChecker($stmt, $this);
$method_checkers[$stmt->name] = $method_checker;
if (self::$this_class && !$check_methods) {
self::$method_checkers[$method_id] = $method_checker;
}
}
else {
$method_checker = self::$method_checkers[$method_id];
}
if (!$stmt->isAbstract()) {
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ClassMethodChecker::setDeclaringMethod($class_context->self . '::' . strtolower($stmt->name), $method_id);
self::$class_methods[$class_context->self][$stmt->name] = true;
}
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} elseif ($stmt instanceof PhpParser\Node\Stmt\TraitUse) {
$method_map = [];
foreach ($stmt->adaptations as $adaptation) {
if ($adaptation instanceof PhpParser\Node\Stmt\TraitUseAdaptation\Alias) {
$method_map[$adaptation->method] = $adaptation->newName;
}
}
foreach ($stmt->traits as $trait) {
$trait_name = self::getAbsoluteClassFromName($trait, $this->namespace, $this->aliased_classes);
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if (!trait_exists($trait_name)) {
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if (IssueBuffer::accepts(
new UndefinedTrait('Trait ' . $trait_name . ' does not exist', $this->file_name, $trait->getLine()),
$this->suppressed_issues
)) {
return false;
}
}
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else {
try {
$reflection_trait = new \ReflectionClass($trait_name);
}
catch (\ReflectionException $e) {
if (IssueBuffer::accepts(
new UndefinedTrait('Trait ' . $trait_name . ' has wrong casing', $this->file_name, $trait->getLine()),
$this->suppressed_issues
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)) {
return false;
}
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continue;
}
$trait_checker = FileChecker::getClassLikeCheckerFromClass($trait_name);
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$trait_checker->check(false, $class_context);
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}
}
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} else {
if ($stmt instanceof PhpParser\Node\Stmt\Property) {
$comment = $stmt->getDocComment();
$type_in_comment = null;
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if ($comment && $config->use_docblock_types && count($stmt->props) === 1) {
$type_in_comment = CommentChecker::getTypeFromComment((string) $comment, null, $this);
}
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$property_type = $type_in_comment ? $type_in_comment : Type::getMixed();
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foreach ($stmt->props as $property) {
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if ($stmt->isStatic()) {
if ($stmt->isPublic()) {
self::$public_static_class_properties[$class_context->self][$property->name] = $property_type;
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}
elseif ($stmt->isProtected()) {
self::$protected_static_class_properties[$class_context->self][$property->name] = $property_type;
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}
elseif ($stmt->isPrivate()) {
self::$private_static_class_properties[$class_context->self][$property->name] = $property_type;
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}
}
else {
if ($stmt->isPublic()) {
self::$public_class_properties[$class_context->self][$property->name] = $property_type;
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}
elseif ($stmt->isProtected()) {
self::$protected_class_properties[$class_context->self][$property->name] = $property_type;
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}
elseif ($stmt->isPrivate()) {
self::$private_class_properties[$class_context->self][$property->name] = $property_type;
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}
}
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if (!$stmt->isStatic()) {
$class_context->vars_in_scope['this->' . $property->name] = $property_type;
}
}
}
elseif ($stmt instanceof PhpParser\Node\Stmt\ClassConst) {
$comment = $stmt->getDocComment();
$type_in_comment = null;
if ($comment && $config->use_docblock_types && count($stmt->consts) === 1) {
$type_in_comment = CommentChecker::getTypeFromComment((string) $comment, null, $this);
}
$const_type = $type_in_comment ? $type_in_comment : Type::getMixed();
foreach ($stmt->consts as $const) {
self::$public_class_constants[$class_context->self][$const->name] = $const_type;
}
}
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$leftover_stmts[] = $stmt;
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}
}
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if (method_exists($this->absolute_class, '__get')) {
$this->has_custom_get = true;
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}
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if ($leftover_stmts) {
(new StatementsChecker($this))->check($leftover_stmts, $class_context);
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}
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$config = Config::getInstance();
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if ($check_methods) {
foreach ($trait_checkers as $trait_checker) {
$trait_checker->check(true, $class_context);
}
// do the method checks after all class methods have been initialised
foreach ($method_checkers as $method_checker) {
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$method_checker->check(clone $class_context);
if (!$config->excludeIssueInFile('InvalidReturnType', $this->file_name)) {
$method_checker->checkReturnTypes();
}
}
}
}
/**
* Used in deep method evaluation, we get method checkers on the current or parent
* classes
*
* @param string $method_id
* @return ClassMethodChecker
*/
public static function getMethodChecker($method_id)
{
if (isset(self::$method_checkers[$method_id])) {
return self::$method_checkers[$method_id];
}
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ClassMethodChecker::registerClassMethod($method_id);
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$declaring_method_id = ClassMethodChecker::getDeclaringMethod($method_id);
$declaring_class = explode('::', $declaring_method_id)[0];
$class_checker = FileChecker::getClassLikeCheckerFromClass($declaring_class);
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if (!$class_checker) {
throw new \InvalidArgumentException('Could not get class checker for ' . $declaring_class);
}
foreach ($class_checker->class->stmts as $stmt) {
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if ($stmt instanceof PhpParser\Node\Stmt\ClassMethod) {
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if ($declaring_method_id === $class_checker->absolute_class . '::' . strtolower($stmt->name)) {
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$method_checker = new ClassMethodChecker($stmt, $class_checker);
self::$method_checkers[$method_id] = $method_checker;
return $method_checker;
}
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}
}
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throw new \InvalidArgumentException('Method checker not found');
}
/**
* Returns a class checker for the given class, if one has already been registered
* @param string $class_name
* @return self|null
*/
public static function getClassLikeCheckerFromClass($class_name)
{
if (isset(self::$class_checkers[$class_name])) {
return self::$class_checkers[$class_name];
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}
return null;
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}
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/**
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* @return bool|null
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*/
public static function checkClassName(PhpParser\Node\Name $class_name, $namespace, array $aliased_classes, $file_name, array $suppressed_issues)
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{
if ($class_name->parts[0] === 'static') {
return;
}
$absolute_class = self::getAbsoluteClassFromName($class_name, $namespace, $aliased_classes);
return self::checkAbsoluteClassOrInterface($absolute_class, $file_name, $class_name->getLine(), $suppressed_issues);
}
/**
* @param string $absolute_class
* @return bool
*/
public static function classOrInterfaceExists($absolute_class)
{
return ClassChecker::classExists($absolute_class) || InterfaceChecker::interfaceExists($absolute_class);
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}
/**
* @param string $absolute_class
* @param string $possible_parent
* @return bool
*/
public static function classExtendsOrImplements($absolute_class, $possible_parent)
{
return ClassChecker::classExtends($absolute_class, $possible_parent)
|| ClassChecker::classImplements($absolute_class, $possible_parent);
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}
/**
* @param string $absolute_class
* @param string $file_name
* @param int $line_number
* @param array<string> $suppressed_issues
* @return bool|null
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*/
public static function checkAbsoluteClassOrInterface($absolute_class, $file_name, $line_number, array $suppressed_issues)
{
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if (empty($absolute_class)) {
throw new \InvalidArgumentException('$class cannot be empty');
}
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$absolute_class = preg_replace('/^\\\/', '', $absolute_class);
$class_exists = ClassChecker::classExists($absolute_class);
$interface_exists = InterfaceChecker::interfaceExists($absolute_class);
if (!$class_exists && !$interface_exists) {
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if (IssueBuffer::accepts(
new UndefinedClass('Class or interface ' . $absolute_class . ' does not exist', $file_name, $line_number),
$suppressed_issues
)) {
return false;
}
return;
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}
if (($class_exists && !ClassChecker::hasCorrectCasing($absolute_class))
|| ($interface_exists && !InterfaceChecker::hasCorrectCasing($absolute_class))
) {
if (IssueBuffer::accepts(
new InvalidClass('Class or interface ' . $absolute_class . ' has wrong casing', $file_name, $line_number),
$suppressed_issues
)) {
return false;
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}
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}
return true;
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}
public static function getAbsoluteClassFromName(PhpParser\Node\Name $class_name, $namespace, array $aliased_classes)
{
if ($class_name instanceof PhpParser\Node\Name\FullyQualified) {
return implode('\\', $class_name->parts);
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}
return self::getAbsoluteClassFromString(implode('\\', $class_name->parts), $namespace, $aliased_classes);
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}
public static function getAbsoluteClassFromString($class, $namespace, array $imported_namespaces)
{
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if (empty($class)) {
throw new \InvalidArgumentException('$class cannot be empty');
}
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if ($class[0] === '\\') {
return substr($class, 1);
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}
if (strpos($class, '\\') !== false) {
$class_parts = explode('\\', $class);
$first_namespace = array_shift($class_parts);
if (isset($imported_namespaces[$first_namespace])) {
return $imported_namespaces[$first_namespace] . '\\' . implode('\\', $class_parts);
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}
} elseif (isset($imported_namespaces[$class])) {
return $imported_namespaces[$class];
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}
return ($namespace ? $namespace . '\\' : '') . $class;
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}
public function getNamespace()
{
return $this->namespace;
}
public function getAliasedClasses()
{
return $this->aliased_classes;
}
public function getAbsoluteClass()
{
return $this->absolute_class;
}
public function getClassName()
{
return $this->class->name;
}
public function getParentClass()
{
return $this->parent_class;
}
public function getFileName()
{
return $this->file_name;
}
public function getClassLikeChecker()
{
return $this;
}
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/**
* @return bool
*/
public function isStatic()
{
return false;
}
public function hasCustomGet()
{
return $this->has_custom_get;
}
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public static function registerClass($class_name)
{
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if (isset(self::$registered_classes[$class_name])) {
return true;
}
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try {
$reflected_class = new ReflectionClass($class_name);
}
catch (\ReflectionException $e) {
return false;
}
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if ($reflected_class->isUserDefined()) {
$class_file_name = $reflected_class->getFileName();
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// this doesn't work on traits
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(new FileChecker($class_file_name))->check(true, false);
}
else {
$class_properties = $reflected_class->getProperties();
self::$public_class_properties[$class_name] = [];
self::$protected_class_properties[$class_name] = [];
self::$private_class_properties[$class_name] = [];
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self::$public_static_class_properties[$class_name] = [];
self::$protected_static_class_properties[$class_name] = [];
self::$private_static_class_properties[$class_name] = [];
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foreach ($class_properties as $class_property) {
if ($class_property->isStatic()) {
if ($class_property->isPublic()) {
self::$public_static_class_properties[$class_name][$class_property->getName()] = Type::getMixed();
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}
elseif ($class_property->isProtected()) {
self::$protected_static_class_properties[$class_name][$class_property->getName()] = Type::getMixed();
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}
elseif ($class_property->isPrivate()) {
self::$private_static_class_properties[$class_name][$class_property->getName()] = Type::getMixed();
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}
}
else {
if ($class_property->isPublic()) {
self::$public_class_properties[$class_name][$class_property->getName()] = Type::getMixed();
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}
elseif ($class_property->isProtected()) {
self::$protected_class_properties[$class_name][$class_property->getName()] = Type::getMixed();
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}
elseif ($class_property->isPrivate()) {
self::$private_class_properties[$class_name][$class_property->getName()] = Type::getMixed();
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}
}
}
$class_constants = $reflected_class->getConstants();
self::$public_class_constants[$class_name] = [];
foreach ($class_constants as $name => $value) {
switch (gettype($value)) {
case 'boolean':
$const_type = Type::getBool();
break;
case 'integer':
$const_type = Type::getInt();
break;
case 'double':
$const_type = Type::getFloat();
break;
case 'string':
$const_type = Type::getString();
break;
case 'array':
$const_type = Type::getArray();
break;
case 'NULL':
$const_type = Type::getNull();
break;
default:
$const_type = Type::getMixed();
}
self::$public_class_constants[$class_name][$name] = $const_type;
}
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self::$registered_classes[$class_name] = true;
if (!$reflected_class->isTrait() && !$reflected_class->isInterface()) {
ClassChecker::getInterfacesForClass($class_name);
}
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$reflection_methods = $reflected_class->getMethods(ReflectionMethod::IS_PUBLIC | ReflectionMethod::IS_PROTECTED);
self::$class_methods[$class_name] = [];
foreach ($reflection_methods as $reflection_method) {
ClassMethodChecker::extractReflectionMethodInfo($reflection_method);
if ($reflection_method->class !== $class_name) {
ClassMethodChecker::setDeclaringMethod(
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$class_name . '::' . strtolower($reflection_method->name),
$reflection_method->class . '::' . strtolower($reflection_method->name)
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);
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self::$class_methods[$class_name][$reflection_method->name] = true;
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}
if (!$reflection_method->isAbstract() && $reflection_method->getDeclaringClass()->getName() === $class_name) {
self::$class_methods[$class_name][$reflection_method->getName()] = true;
}
}
}
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return true;
}
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protected function registerInheritedMethods($parent_class, array $method_map = null)
{
$class_methods = self::$class_methods[$parent_class];
foreach ($class_methods as $method_name => $_) {
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$parent_method_id = $parent_class . '::' . strtolower($method_name);
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$declaring_method_id = ClassMethodChecker::getDeclaringMethod($parent_method_id);
$mapped_name = isset($method_map[$method_name]) ? $method_map[$method_name] : $method_name;
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$implemented_method_id = $this->absolute_class . '::' . strtolower($mapped_name);
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if (!isset(self::$class_methods[$this->absolute_class][$mapped_name])) {
ClassMethodChecker::setDeclaringMethod($implemented_method_id, $declaring_method_id);
self::$class_methods[$this->absolute_class][$mapped_name] = true;
}
}
}
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public static function getInstancePropertiesForClass($class_name, $visibility)
{
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if (self::registerClass($class_name) === false) {
return [];
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}
if ($visibility === ReflectionProperty::IS_PUBLIC) {
return self::$public_class_properties[$class_name];
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}
elseif ($visibility === ReflectionProperty::IS_PROTECTED) {
return array_merge(
self::$public_class_properties[$class_name],
self::$protected_class_properties[$class_name]
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);
}
elseif ($visibility === ReflectionProperty::IS_PRIVATE) {
return array_merge(
self::$public_class_properties[$class_name],
self::$protected_class_properties[$class_name],
self::$private_class_properties[$class_name]
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);
}
throw new \InvalidArgumentException('Must specify $visibility');
}
public static function getStaticPropertiesForClass($class_name, $visibility)
{
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if (self::registerClass($class_name) === false) {
return [];
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}
if ($visibility === ReflectionProperty::IS_PUBLIC) {
return self::$public_static_class_properties[$class_name];
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}
elseif ($visibility === ReflectionProperty::IS_PROTECTED) {
return array_merge(
self::$public_static_class_properties[$class_name],
self::$protected_static_class_properties[$class_name]
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);
}
elseif ($visibility === ReflectionProperty::IS_PRIVATE) {
return array_merge(
self::$public_static_class_properties[$class_name],
self::$protected_static_class_properties[$class_name],
self::$private_static_class_properties[$class_name]
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);
}
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throw new \InvalidArgumentException('Must specify $visibility');
}
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public static function getConstantsForClass($class_name, $visibility)
{
// remove for PHP 7.1 support
$visibility = ReflectionProperty::IS_PUBLIC;
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if (self::registerClass($class_name) === false) {
return [];
}
if ($visibility === ReflectionProperty::IS_PUBLIC) {
return self::$public_class_constants[$class_name];
}
throw new \InvalidArgumentException('Given $visibility not supported');
}
public static function setConstantType($class_name, $const_name, Type\Union $type)
{
self::$public_class_constants[$class_name][$const_name] = $type;
}
public function getSource()
{
return null;
}
public function getSuppressedIssues()
{
return $this->suppressed_issues;
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}
public static function setThisClass($this_class)
{
self::$this_class = $this_class;
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self::$class_checkers = [];
}
public static function getThisClass()
{
return self::$this_class;
}
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public static function clearCache()
{
self::$method_checkers = [];
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self::$this_class = null;
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self::$class_implements = [];
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self::$class_methods = [];
self::$class_checkers = [];
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self::$public_class_properties = [];
self::$protected_class_properties = [];
self::$private_class_properties = [];
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self::$public_static_class_properties = [];
self::$protected_static_class_properties = [];
self::$private_static_class_properties = [];
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ClassChecker::clearCache();
InterfaceChecker::clearCache();
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}
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}