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psalm/src/Psalm/Checker/MethodChecker.php

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<?php
namespace Psalm\Checker;
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use PhpParser;
use Psalm\Config;
use Psalm\Exception\DocblockParseException;
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use Psalm\Issue\DeprecatedMethod;
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use Psalm\Issue\InaccessibleMethod;
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use Psalm\Issue\InvalidDocblock;
use Psalm\Issue\InvalidStaticInvocation;
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use Psalm\Issue\UndefinedMethod;
use Psalm\IssueBuffer;
use Psalm\StatementsSource;
use Psalm\Type;
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class MethodChecker extends FunctionLikeChecker
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{
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const VISIBILITY_PUBLIC = 1;
const VISIBILITY_PROTECTED = 2;
const VISIBILITY_PRIVATE = 3;
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/**
* @var array<string,string>
*/
protected static $method_files = [];
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/**
* @var array<string,array<\Psalm\FunctionLikeParameter>>
*/
protected static $method_params = [];
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/**
* @var array<string,string>
*/
protected static $method_namespaces = [];
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/**
* @var array<string,Type\Union>
*/
protected static $method_return_types = [];
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/**
* @var array<string, string>
*/
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protected static $cased_method_ids = [];
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/**
* @var array<string, bool>
*/
protected static $static_methods = [];
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/**
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* @var array<string, string>
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*/
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protected static $declaring_methods = [];
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/**
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* @var array<string, array<string>>
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*/
protected static $overridden_methods = [];
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/**
* @var array<string, bool>
*/
protected static $have_reflected = [];
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/**
* @var array<string, bool>
*/
protected static $have_registered = [];
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/**
* @var array<string, string>
*/
protected static $method_visibility = [];
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/**
* @var array<string, array<int, string>>
*/
protected static $method_suppress = [];
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/**
* @var array<string, bool>
*/
protected static $deprecated_methods = [];
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/**
* A dictionary of variadic methods
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*
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* @var array<string, bool>
*/
protected static $variadic_methods = [];
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/**
* @param PhpParser\Node\FunctionLike $function
* @param StatementsSource $source
* @param array $this_vars
*/
public function __construct($function, StatementsSource $source, array $this_vars = [])
{
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if (!$function instanceof PhpParser\Node\Stmt\ClassMethod) {
throw new \InvalidArgumentException('Must be called with a ClassMethod');
}
parent::__construct($function, $source);
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$this->registerMethod($function);
$this->is_static = $function->isStatic();
}
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/**
* @param string $method_id
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* @return array<\Psalm\FunctionLikeParameter>|null
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*/
public static function getMethodParams($method_id)
{
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self::registerClassMethod($method_id);
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if ($method_id = self::getDeclaringMethodId($method_id)) {
return self::$method_params[$method_id];
}
}
/**
* @param string $method_id
* @return boolean
*/
public static function isVariadic($method_id)
{
self::registerClassMethod($method_id);
$method_id = self::getDeclaringMethodId($method_id);
return isset(self::$variadic_methods[$method_id]);
}
/**
* @param string $method_id
* @return Type\Union|null
*/
public static function getMethodReturnTypes($method_id)
{
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self::registerClassMethod($method_id);
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/** @var string */
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$method_id = self::getDeclaringMethodId($method_id);
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if (self::$method_return_types[$method_id]) {
return clone self::$method_return_types[$method_id];
}
$overridden_method_ids = self::getOverriddenMethodIds($method_id);
foreach ($overridden_method_ids as $overridden_method_id) {
if (self::$method_return_types[$overridden_method_id]) {
$implementary_return_type = self::$method_return_types[$overridden_method_id];
if ($implementary_return_type->isNull()) {
return Type::getVoid();
}
return $implementary_return_type;
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}
}
return null;
}
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/**
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* @param \ReflectionMethod $method
* @return null
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*/
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public static function extractReflectionMethodInfo(\ReflectionMethod $method)
{
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$method_id = $method->class . '::' . strtolower((string)$method->name);
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self::$cased_method_ids[$method_id] = $method->class . '::' . $method->name;
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if (isset(self::$have_reflected[$method_id])) {
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return null;
}
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/** @var \ReflectionClass */
$declaring_class = $method->getDeclaringClass();
self::$have_reflected[$method_id] = true;
self::$static_methods[$method_id] = $method->isStatic();
self::$method_files[$method_id] = $method->getFileName();
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self::$method_namespaces[$method_id] = $declaring_class->getNamespaceName();
self::$declaring_methods[$method_id] = $declaring_class->name . '::' . strtolower((string)$method->getName());
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self::$method_visibility[$method_id] = $method->isPrivate()
? self::VISIBILITY_PRIVATE
: ($method->isProtected() ? self::VISIBILITY_PROTECTED : self::VISIBILITY_PUBLIC);
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$params = $method->getParameters();
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$method_param_names = [];
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$method_param_types = [];
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self::$method_params[$method_id] = [];
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/** @var \ReflectionParameter $param */
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foreach ($params as $param) {
$param_array = self::getReflectionParamArray($param);
self::$method_params[$method_id][] = $param_array;
$method_param_names[$param->name] = true;
$method_param_types[$param->name] = $param_array->type;
}
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$return_types = null;
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$config = Config::getInstance();
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$return_type = null;
self::$method_return_types[$method_id] = $return_type;
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return null;
}
/**
* Determines whether a given method is static or not
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*
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* @param string $method_id
* @param string $file_name
* @param int $line_number
* @param array<int, string> $suppressed_issues
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* @return bool
*/
public static function checkMethodStatic($method_id, $file_name, $line_number, array $suppressed_issues)
{
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self::registerClassMethod($method_id);
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/** @var string */
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$method_id = self::getDeclaringMethodId($method_id);
if (!self::$static_methods[$method_id]) {
if (IssueBuffer::accepts(
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new InvalidStaticInvocation(
'Method ' . MethodChecker::getCasedMethodId($method_id) . ' is not static',
$file_name,
$line_number
),
$suppressed_issues
)) {
return false;
}
}
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return true;
}
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/**
* @param PhpParser\Node\Stmt\ClassMethod $method
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* @return null|false
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*/
protected function registerMethod(PhpParser\Node\Stmt\ClassMethod $method)
{
$method_id = $this->fq_class_name . '::' . strtolower($method->name);
$cased_method_id = self::$cased_method_ids[$method_id] = $this->fq_class_name . '::' . $method->name;
if (isset(self::$have_reflected[$method_id]) || isset(self::$have_registered[$method_id])) {
$this->suppressed_issues = self::$method_suppress[$method_id];
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return null;
}
self::$have_registered[$method_id] = true;
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self::$declaring_methods[$method_id] = $method_id;
self::$static_methods[$method_id] = $method->isStatic();
self::$method_namespaces[$method_id] = $this->namespace;
self::$method_files[$method_id] = $this->file_name;
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if ($method->isPrivate()) {
self::$method_visibility[$method_id] = self::VISIBILITY_PRIVATE;
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} elseif ($method->isProtected()) {
self::$method_visibility[$method_id] = self::VISIBILITY_PROTECTED;
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} else {
self::$method_visibility[$method_id] = self::VISIBILITY_PUBLIC;
}
self::$method_params[$method_id] = [];
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$method_param_names = [];
foreach ($method->getParams() as $param) {
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$param_array = $this->getTranslatedParam(
$param,
$this->fq_class_name,
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$this->namespace,
$this->getAliasedClasses()
);
self::$method_params[$method_id][] = $param_array;
$method_param_names[$param->name] = $param_array->type;
}
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$config = Config::getInstance();
$return_type = null;
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$doc_comment = $method->getDocComment();
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self::$method_suppress[$method_id] = [];
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if (isset($method->returnType)) {
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$return_type = Type::parseString(
is_string($method->returnType)
? $method->returnType
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: ClassLikeChecker::getFullyQualifiedClassFromName(
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$method->returnType,
$this->namespace,
$this->getAliasedClasses()
)
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);
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}
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if ($doc_comment) {
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$docblock_info = null;
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try {
$docblock_info = CommentChecker::extractDocblockInfo((string)$doc_comment);
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} catch (DocblockParseException $e) {
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if (IssueBuffer::accepts(
new InvalidDocblock(
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'Invalid type passed in docblock for ' . $cased_method_id,
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$this->getCheckedFileName(),
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$method->getLine()
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)
)) {
return false;
}
}
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if ($docblock_info) {
if ($docblock_info['deprecated']) {
self::$deprecated_methods[$method_id] = true;
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}
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if ($docblock_info['variadic']) {
self::$variadic_methods[$method_id] = true;
}
$this->suppressed_issues = $docblock_info['suppress'];
self::$method_suppress[$method_id] = $this->suppressed_issues;
if ($config->use_docblock_types) {
if ($docblock_info['return_type']) {
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$return_type = Type::parseString(
$this->fixUpLocalType(
(string)$docblock_info['return_type'],
$this->fq_class_name,
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$this->namespace,
$this->getAliasedClasses()
)
);
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}
if ($docblock_info['params']) {
$this->improveParamsFromDocblock(
$docblock_info['params'],
$method_param_names,
self::$method_params[$method_id],
$method->getLine()
);
}
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}
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}
}
self::$method_return_types[$method_id] = $return_type;
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return null;
}
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/**
* @param string $return_type
* @param string $method_id
* @return string
*/
protected static function fixUpReturnType($return_type, $method_id)
{
if (strpos($return_type, '[') !== false) {
$return_type = Type::convertSquareBrackets($return_type);
}
$return_type_tokens = Type::tokenize($return_type);
foreach ($return_type_tokens as $i => &$return_type_token) {
if ($return_type_token[0] === '\\') {
$return_type_token = substr($return_type_token, 1);
continue;
}
if (in_array($return_type_token, ['<', '>', '|', '?', ',', '{', '}', ':'])) {
continue;
}
if (isset($return_type_token[$i + 1]) && $return_type_token[$i + 1] === ':') {
continue;
}
$return_type_token = Type::fixScalarTerms($return_type_token);
if ($return_type_token[0] === strtoupper($return_type_token[0])) {
$fq_class_name = explode('::', $method_id)[0];
if ($return_type_token === '$this') {
$return_type_token = $fq_class_name;
continue;
}
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$return_type_token = FileChecker::getFullyQualifiedClassFromNameInFile(
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$return_type_token,
self::$method_namespaces[$method_id],
self::$method_files[$method_id]
);
}
}
return implode('', $return_type_tokens);
}
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/**
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* @param string $method_id
* @param string $file_name
* @param int $line_number
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* @param array $suppressed_issues
* @return bool|null
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*/
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public static function checkMethodExists($method_id, $file_name, $line_number, array $suppressed_issues)
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{
if (self::methodExists($method_id)) {
return true;
}
if (IssueBuffer::accepts(
new UndefinedMethod('Method ' . $method_id . ' does not exist', $file_name, $line_number),
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$suppressed_issues
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)) {
return false;
}
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return null;
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}
/**
* Whether or not a given method exists
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*
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* @param string $method_id
* @return bool
*/
public static function methodExists($method_id)
{
// remove trailing backslash if it exists
$method_id = preg_replace('/^\\\\/', '', $method_id);
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$method_parts = explode('::', $method_id);
$method_parts[1] = strtolower($method_parts[1]);
$method_id = implode('::', $method_parts);
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self::registerClassMethod($method_id);
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if (isset(self::$declaring_methods[$method_id])) {
return true;
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}
if ($method_parts[1] === '__construct') {
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// @todo ?
}
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if (FunctionChecker::inCallMap($method_id)) {
return true;
}
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return false;
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}
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/**
* @param string $method_id
* @return void
*/
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public static function registerClassMethod($method_id)
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{
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ClassLikeChecker::registerClass(explode('::', $method_id)[0]);
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}
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/**
* @param string $method_id
* @param string $file_name
* @param int $line_number
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* @param array $suppressed_issues
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* @return false|null
*/
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public static function checkMethodNotDeprecated($method_id, $file_name, $line_number, array $suppressed_issues)
{
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self::registerClassMethod($method_id);
if (isset(self::$deprecated_methods[$method_id])) {
if (IssueBuffer::accepts(
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new DeprecatedMethod(
'The method ' . MethodChecker::getCasedMethodId($method_id) . ' has been marked as deprecated',
$file_name,
$line_number
),
$suppressed_issues
)) {
return false;
}
}
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return null;
}
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/**
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* @param string $method_id
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* @param string|null $calling_context
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* @param StatementsSource $source
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* @param int $line_number
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* @param array $suppressed_issues
* @return false|null
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*/
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public static function checkMethodVisibility(
$method_id,
$calling_context,
StatementsSource $source,
$line_number,
array $suppressed_issues
) {
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self::registerClassMethod($method_id);
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$declared_method_id = self::getDeclaringMethodId($method_id);
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$method_class = explode('::', $method_id)[0];
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$method_name = explode('::', $method_id)[1];
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if (!isset(self::$method_visibility[$declared_method_id])) {
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if (IssueBuffer::accepts(
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new InaccessibleMethod('Cannot access method ' . $method_id, $source->getFileName(), $line_number),
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$suppressed_issues
)) {
return false;
}
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}
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if ($source->getSource() instanceof TraitChecker && $method_class === $source->getFullyQualifiedClass()) {
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return null;
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}
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switch (self::$method_visibility[$declared_method_id]) {
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case self::VISIBILITY_PUBLIC:
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return null;
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case self::VISIBILITY_PRIVATE:
if (!$calling_context || $method_class !== $calling_context) {
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if (IssueBuffer::accepts(
new InaccessibleMethod(
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'Cannot access private method ' . MethodChecker::getCasedMethodId($method_id) .
' from context ' . $calling_context,
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$source->getFileName(),
$line_number
),
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$suppressed_issues
)) {
return false;
}
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}
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return null;
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case self::VISIBILITY_PROTECTED:
if ($method_class === $calling_context) {
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return null;
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}
if (!$calling_context) {
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if (IssueBuffer::accepts(
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new InaccessibleMethod(
'Cannot access protected method ' . $method_id,
$source->getFileName(),
$line_number
),
$suppressed_issues
)) {
return false;
}
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return null;
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}
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if (ClassChecker::classExtends($method_class, $calling_context) &&
MethodChecker::methodExists($calling_context . '::' . $method_name)
) {
return null;
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}
if (!ClassChecker::classExtends($calling_context, $method_class)) {
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if (IssueBuffer::accepts(
new InaccessibleMethod(
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'Cannot access protected method ' . MethodChecker::getCasedMethodId($method_id) .
' from context ' . $calling_context,
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$source->getFileName(),
$line_number
),
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$suppressed_issues
)) {
return false;
}
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}
}
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return null;
}
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/**
* @param string $method_id
* @param string $declaring_method_id
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* @return void
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*/
public static function setDeclaringMethodId($method_id, $declaring_method_id)
{
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self::$declaring_methods[$method_id] = $declaring_method_id;
}
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/**
* @param string $method_id
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* @return string|null
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*/
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public static function getDeclaringMethodId($method_id)
{
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if (isset(self::$declaring_methods[$method_id])) {
return self::$declaring_methods[$method_id];
}
return null;
}
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/**
* @param string $method_id
* @param string $overridden_method_id
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* @return void
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*/
public static function setOverriddenMethodId($method_id, $overridden_method_id)
{
self::$overridden_methods[$method_id][] = $overridden_method_id;
}
/**
* @param string $method_id
* @return array<string>
*/
public static function getOverriddenMethodIds($method_id)
{
return isset(self::$overridden_methods[$method_id]) ? self::$overridden_methods[$method_id] : [];
}
/**
* @param string $method_id
* @return string
*/
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public static function getCasedMethodId($method_id)
{
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$method_id = self::getDeclaringMethodId($method_id);
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return self::$cased_method_ids[$method_id];
}
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/**
* @return void
*/
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public static function clearCache()
{
self::$method_files = [];
self::$method_params = [];
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self::$cased_method_ids = [];
self::$method_namespaces = [];
self::$method_return_types = [];
self::$static_methods = [];
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self::$declaring_methods = [];
self::$have_reflected = [];
self::$have_registered = [];
self::$method_visibility = [];
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self::$overridden_methods = [];
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}
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}