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https://github.com/danog/psalm.git
synced 2024-12-14 18:36:58 +01:00
692 lines
25 KiB
PHP
692 lines
25 KiB
PHP
<?php
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namespace CodeInspector;
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use CodeInspector\Issue\UndefinedMethod;
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use CodeInspector\Issue\InaccessibleMethod;
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use CodeInspector\Issue\InvalidReturnType;
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use CodeInspector\Issue\InvalidDocblock;
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use PhpParser;
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class ClassMethodChecker extends FunctionChecker
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{
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protected static $_method_comments = [];
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protected static $_method_files = [];
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protected static $_method_params = [];
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protected static $_method_namespaces = [];
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protected static $_method_return_types = [];
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protected static $_static_methods = [];
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protected static $_declaring_classes = [];
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protected static $_existing_methods = [];
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protected static $_have_reflected = [];
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protected static $_have_registered = [];
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protected static $_inherited_methods = [];
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protected static $_declaring_class = [];
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protected static $_method_visibility = [];
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protected static $_new_docblocks = [];
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const VISIBILITY_PUBLIC = 1;
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const VISIBILITY_PROTECTED = 2;
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const VISIBILITY_PRIVATE = 3;
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public function __construct(PhpParser\Node\FunctionLike $function, StatementsSource $source, array $this_vars = [])
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{
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parent::__construct($function, $source);
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if ($function instanceof PhpParser\Node\Stmt\ClassMethod) {
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$this->_registerMethod($function);
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$this->_is_static = $function->isStatic();
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}
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}
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/**
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* @return false|null
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*/
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public function checkReturnTypes($update_doc_comment = false)
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{
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if (!$this->_function->stmts) {
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return;
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}
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if ($this->_function->name === '__construct') {
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// we know that constructors always return this
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return;
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}
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if (!isset(self::$_new_docblocks[$this->_file_name])) {
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self::$_new_docblocks[$this->_file_name] = [];
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}
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$method_id = $this->_absolute_class . '::' . $this->_function->name;
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$declared_return_type = self::getMethodReturnTypes($method_id);
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if ($declared_return_type) {
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$inferred_return_types = EffectsAnalyser::getReturnTypes($this->_function->stmts, true);
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if (!$inferred_return_types) {
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if ($declared_return_type->isVoid()) {
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return;
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}
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if (ScopeChecker::onlyThrows($this->_function->stmts)) {
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// if there's a single throw statement, it's presumably an exception saying this method is not to be used
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return;
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}
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if (IssueBuffer::accepts(
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new InvalidReturnType(
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'No return type was found for method ' . $method_id . ' but return type \'' . $declared_return_type . '\' was expected',
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$this->_file_name,
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$this->_function->getLine()
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)
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)) {
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return false;
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}
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return;
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}
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$inferred_return_type = Type::combineTypes($inferred_return_types);
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if ($inferred_return_type && !$inferred_return_type->isMixed() && !$declared_return_type->isMixed()) {
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if ($inferred_return_type->isNull() && $declared_return_type->isVoid()) {
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return;
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}
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$simple_declared_return_types = array_map(
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function ($return_type) {
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return $return_type->value;
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},
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$declared_return_type->types
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);
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$simple_inferred_return_types = array_map(
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function ($return_type) {
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return $return_type->value;
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},
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$inferred_return_type->types
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);
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// gets elements A△B
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$differing_types = array_diff($simple_inferred_return_types, $simple_declared_return_types);
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if (count($differing_types) && (string) $inferred_return_type !== (string) $declared_return_type) {
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// check whether the differing types are subclasses of declared return types
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$truly_different = false;
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foreach ($differing_types as $differing_type) {
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$is_match = false;
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foreach ($simple_declared_return_types as $simple_declared_return_type) {
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if (is_subclass_of($differing_type, $simple_declared_return_type) ||
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(in_array($differing_type, ['float', 'double', 'int']) && in_array($simple_declared_return_type, ['float', 'double', 'int'])) ||
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(in_array($differing_type, ['boolean', 'bool']) && in_array($simple_declared_return_type, ['boolean', 'bool']))
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) {
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$is_match = true;
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break;
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}
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}
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if (!$is_match) {
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$truly_different = true;
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}
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}
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if ($truly_different) {
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if ($inferred_return_type->isNull()) {
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$inferred_return_type = Type::getVoid();
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}
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if (IssueBuffer::accepts(
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new InvalidReturnType(
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'The given return type \'' . $declared_return_type . '\' for ' . $method_id . ' is incorrect, got \'' . $inferred_return_type . '\'',
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$this->_file_name,
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$this->_function->getLine()
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)
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)) {
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return false;
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}
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}
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}
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}
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return;
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}
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}
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public static function getMethodParams($method_id)
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{
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self::_populateData($method_id);
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return self::$_method_params[$method_id];
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}
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public static function getMethodReturnTypes($method_id)
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{
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self::_populateData($method_id);
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return self::$_method_return_types[$method_id] ? clone self::$_method_return_types[$method_id] : null;
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}
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/**
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* @return void
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*/
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public static function extractReflectionMethodInfo($method_id)
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{
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if (isset(self::$_have_reflected[$method_id]) || isset(self::$_have_registered[$method_id])) {
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return;
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}
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try {
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$method = new \ReflectionMethod($method_id);
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}
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catch (\ReflectionException $e) {
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// maybe it's an old-timey constructor
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$absolute_class = explode('::', $method_id)[0];
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$class_name = array_pop(explode('\\', $absolute_class));
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$alt_method_id = $absolute_class . '::' . $class_name;
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$method = new \ReflectionMethod($alt_method_id);
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}
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self::$_have_reflected[$method_id] = true;
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self::$_static_methods[$method_id] = $method->isStatic();
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self::$_method_files[$method_id] = $method->getFileName();
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self::$_method_namespaces[$method_id] = $method->getDeclaringClass()->getNamespaceName();
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self::$_declaring_classes[$method_id] = $method->getDeclaringClass()->name . '::' . $method->getName();
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self::$_method_visibility[$method_id] = $method->isPrivate() ?
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self::VISIBILITY_PRIVATE :
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($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[$method_id] = [];
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foreach ($params as $param) {
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$param_type_string = null;
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if ($param->isArray()) {
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$param_type_string = 'array';
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}
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else {
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$param_class = null;
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try {
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$param_class = $param->getClass();
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}
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catch (\ReflectionException $e) {
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// do nothing
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}
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if ($param_class && self::$_method_files[$method_id]) {
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$param_type_string = $param->getClass()->getName();
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}
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}
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$is_nullable = false;
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try {
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$is_nullable = $param->getDefaultValue() === null;
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if ($param_type_string && $is_nullable) {
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$param_type_string .= '|null';
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}
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}
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catch (\ReflectionException $e) {
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// do nothing
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}
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$param_name = $param->getName();
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$param_type = $param_type_string ? Type::parseString($param_type_string) : Type::getMixed();
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$method_param_names[$param_name] = true;
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$method_param_types[$param_name] = $param_type;
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self::$_method_params[$method_id][] = [
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'name' => $param_name,
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'by_ref' => $param->isPassedByReference(),
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'type' => $param_type,
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'is_nullable' => $is_nullable
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];
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}
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$return_types = null;
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$config = Config::getInstance();
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$return_type = null;
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if ($config->use_docblock_types) {
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$docblock_info = CommentChecker::extractDocblockInfo($method->getDocComment());
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if ($docblock_info['return_type']) {
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$return_type = Type::parseString(
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self::_fixUpReturnType($docblock_info['return_type'], $method_id)
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);
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}
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if ($docblock_info['params']) {
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foreach ($docblock_info['params'] as $docblock_param) {
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$docblock_param_name = $docblock_param['name'];
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if (isset($method_param_names[$param_name])) {
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foreach (self::$_method_params[$method_id] as &$param_info) {
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if ($param_info['name'] === $docblock_param_name) {
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$docblock_param_type_string = $docblock_param['type'];
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$existing_param_type = $param_info['type'];
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$new_param_type = Type::parseString(
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self::_fixUpReturnType($docblock_param_type_string, $method_id)
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);
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// only fix the type if we're dealing with an undefined or generic type
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if ($existing_param_type->isMixed() || $new_param_type->hasGeneric()) {
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$existing_param_type_nullable = $param_info['is_nullable'];
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if ($existing_param_type_nullable && !$new_param_type->isNullable()) {
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$new_param_type->types['null'] = Type::getNull(false);
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}
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$param_info['type'] = $new_param_type;
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}
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}
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}
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}
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}
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}
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}
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self::$_method_return_types[$method_id] = $return_type;
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}
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protected static function _copyToChildMethod($method_id, $child_method_id)
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{
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if (!isset(self::$_have_registered[$method_id]) && !isset(self::$_have_reflected[$method_id])) {
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self::extractReflectionMethodInfo($method_id);
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}
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if (self::$_method_visibility[$method_id] !== self::VISIBILITY_PRIVATE) {
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self::$_method_files[$child_method_id] = self::$_method_files[$method_id];
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self::$_method_params[$child_method_id] = self::$_method_params[$method_id];
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self::$_method_namespaces[$child_method_id] = self::$_method_namespaces[$method_id];
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self::$_method_return_types[$child_method_id] = self::$_method_return_types[$method_id];
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self::$_static_methods[$child_method_id] = self::$_static_methods[$method_id];
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self::$_method_visibility[$child_method_id] = self::$_method_visibility[$method_id];
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self::$_declaring_classes[$child_method_id] = self::$_declaring_classes[$method_id];
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self::$_existing_methods[$child_method_id] = 1;
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}
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}
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/**
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* Determines whether a given method is static or not
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* @param string $method_id
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* @return bool
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*/
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public static function isGivenMethodStatic($method_id)
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{
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self::_populateData($method_id);
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return self::$_static_methods[$method_id];
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}
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protected function _registerMethod(PhpParser\Node\Stmt\ClassMethod $method)
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{
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$method_id = $this->_absolute_class . '::' . $method->name;
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if (isset(self::$_have_reflected[$method_id]) || isset(self::$_have_registered[$method_id])) {
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return;
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}
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self::$_have_registered[$method_id] = true;
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self::$_declaring_classes[$method_id] = $method_id;
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self::$_static_methods[$method_id] = $method->isStatic();
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self::$_method_comments[$method_id] = $method->getDocComment() ?: '';
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self::$_method_namespaces[$method_id] = $this->_namespace;
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self::$_method_files[$method_id] = $this->_file_name;
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self::$_existing_methods[$method_id] = 1;
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if ($method->isPrivate()) {
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self::$_method_visibility[$method_id] = self::VISIBILITY_PRIVATE;
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}
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elseif ($method->isProtected()) {
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self::$_method_visibility[$method_id] = self::VISIBILITY_PROTECTED;
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}
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else {
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self::$_method_visibility[$method_id] = self::VISIBILITY_PUBLIC;
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}
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self::$_method_params[$method_id] = [];
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$method_param_names = [];
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foreach ($method->getParams() as $param) {
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$param_type = null;
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if ($param->type) {
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if ($param->type instanceof Type) {
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$param_type = $param_type;
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}
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else {
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if (is_string($param->type)) {
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$param_type_string = $param->type;
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}
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elseif ($param->type instanceof PhpParser\Node\Name\FullyQualified) {
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$param_type_string = implode('\\', $param->type->parts);
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}
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elseif ($param->type->parts === ['self']) {
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$param_type_string = $this->_absolute_class;
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}
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else {
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$param_type_string = ClassChecker::getAbsoluteClassFromString(implode('\\', $param->type->parts), $this->_namespace, $this->_aliased_classes);
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}
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$is_nullable = $param->default !== null &&
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$param->default instanceof \PhpParser\Node\Expr\ConstFetch &&
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$param->default->name instanceof PhpParser\Node\Name &&
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$param->default->name->parts = ['null'];
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if ($param_type_string) {
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if ($is_nullable) {
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$param_type_string .= '|null';
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}
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$param_type = Type::parseString($param_type_string);
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}
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}
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}
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$method_param_names[$param->name] = $param_type;
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self::$_method_params[$method_id][] = [
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'name' => $param->name,
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'by_ref' => $param->byRef,
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'type' => $param_type ?: Type::getMixed(),
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];
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}
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$config = Config::getInstance();
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$return_type = null;
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if ($config->use_docblock_types) {
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$docblock_info = CommentChecker::extractDocblockInfo($method->getDocComment());
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if ($docblock_info['return_type']) {
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$return_type =
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Type::parseString(
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$this->fixUpLocalType(
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$docblock_info['return_type'],
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$this->_absolute_class,
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$this->_namespace,
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$this->_aliased_classes
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)
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);
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}
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if ($docblock_info['params']) {
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foreach ($docblock_info['params'] as $docblock_param) {
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$param_name = $docblock_param['name'];
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if (!array_key_exists($param_name, $method_param_names)) {
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if (IssueBuffer::accepts(
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new InvalidDocblock('Parameter $' . $param_name .' does not appear in the argument list for ' . $method_id, $this->_file_name, $method->getLine())
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)) {
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return false;
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}
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continue;
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}
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$param_type =
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Type::parseString(
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$this->fixUpLocalType(
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$docblock_param['type'],
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$this->_absolute_class,
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$this->_namespace,
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$this->_aliased_classes
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)
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);
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if ($method_param_names[$param_name] && !$method_param_names[$param_name]->isMixed()) {
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if (!$param_type->isIn($method_param_names[$param_name])) {
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if (IssueBuffer::accepts(
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new InvalidDocblock(
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'Parameter $' . $param_name .' has wrong type \'' . $param_type . '\', should be \'' . $method_param_names[$param_name] . '\'',
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$this->_file_name,
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$method->getLine()
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)
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)) {
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return false;
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}
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continue;
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}
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}
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}
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}
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}
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self::$_method_return_types[$method_id] = $return_type;
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}
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public static function fixUpLocalType($return_type, $absolute_class, $namespace, $aliased_classes)
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{
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if (strpos($return_type, '[') !== false) {
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$return_type = Type::convertSquareBrackets($return_type);
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}
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$return_type_tokens = Type::tokenize($return_type);
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foreach ($return_type_tokens as &$return_type_token) {
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if ($return_type_token[0] === '\\') {
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$return_type_token = substr($return_type_token, 1);
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continue;
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}
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if (in_array($return_type_token, ['<', '>', '|'])) {
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continue;
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}
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$return_type_token = Type::fixScalarTerms($return_type_token);
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if ($return_type_token[0] === strtoupper($return_type_token[0])) {
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if ($return_type === '$this' && $absolute_class) {
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$return_type_token = $absolute_class;
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continue;
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}
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$return_type_token = ClassChecker::getAbsoluteClassFromString($return_type_token, $namespace, $aliased_classes);
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}
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}
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return implode('', $return_type_tokens);
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}
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protected static function _fixUpReturnType($return_type, $method_id)
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{
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if (strpos($return_type, '[') !== false) {
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$return_type = Type::convertSquareBrackets($return_type);
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}
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$return_type_tokens = Type::tokenize($return_type);
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foreach ($return_type_tokens as &$return_type_token) {
|
|
if ($return_type_token[0] === '\\') {
|
|
$return_type_token = substr($return_type_token, 1);
|
|
continue;
|
|
}
|
|
|
|
if (in_array($return_type_token, ['<', '>', '|'])) {
|
|
continue;
|
|
}
|
|
|
|
$return_type_token = Type::fixScalarTerms($return_type_token);
|
|
|
|
if ($return_type_token[0] === strtoupper($return_type_token[0])) {
|
|
$absolute_class = explode('::', $method_id)[0];
|
|
|
|
if ($return_type_token === '$this') {
|
|
$return_type_token = $absolute_class;
|
|
continue;
|
|
}
|
|
|
|
$return_type_token = FileChecker::getAbsoluteClassFromNameInFile($return_type_token, self::$_method_namespaces[$method_id], self::$_method_files[$method_id]);
|
|
}
|
|
}
|
|
|
|
return implode('', $return_type_tokens);
|
|
}
|
|
|
|
/**
|
|
* @return false|null
|
|
*/
|
|
public static function checkMethodExists($method_id, $file_name, $stmt)
|
|
{
|
|
if (isset(self::$_existing_methods[$method_id])) {
|
|
return;
|
|
}
|
|
|
|
$method_parts = explode('::', $method_id);
|
|
|
|
if (method_exists($method_parts[0], $method_parts[1])) {
|
|
self::$_existing_methods[$method_id] = 1;
|
|
return;
|
|
}
|
|
|
|
if (IssueBuffer::accepts(
|
|
new UndefinedMethod('Method ' . $method_id . ' does not exist', $file_name, $stmt->getLine())
|
|
)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
protected static function _populateData($method_id)
|
|
{
|
|
if (!isset(self::$_have_reflected[$method_id]) && !isset(self::$_have_registered[$method_id])) {
|
|
if (isset(self::$_inherited_methods[$method_id])) {
|
|
self::_copyToChildMethod(self::$_inherited_methods[$method_id], $method_id);
|
|
}
|
|
else {
|
|
self::extractReflectionMethodInfo($method_id);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return false|null
|
|
*/
|
|
public static function checkMethodVisibility($method_id, $calling_context, $file_name, $line_number)
|
|
{
|
|
self::_populateData($method_id);
|
|
|
|
$method_class = explode('::', $method_id)[0];
|
|
$method_name = explode('::', $method_id)[1];
|
|
|
|
if (!isset(self::$_method_visibility[$method_id])) {
|
|
if (IssueBuffer::accepts(
|
|
new InaccessibleMethod('Cannot access method ' . $method_id, $file_name, $line_number)
|
|
)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
switch (self::$_method_visibility[$method_id]) {
|
|
case self::VISIBILITY_PUBLIC:
|
|
return;
|
|
|
|
case self::VISIBILITY_PRIVATE:
|
|
if (!$calling_context || $method_class !== $calling_context) {
|
|
if (IssueBuffer::accepts(
|
|
new InaccessibleMethod('Cannot access private method ' . $method_id . ' from context ' . $calling_context, $file_name, $line_number)
|
|
)) {
|
|
return false;
|
|
}
|
|
}
|
|
return;
|
|
|
|
case self::VISIBILITY_PROTECTED:
|
|
if ($method_class === $calling_context) {
|
|
return;
|
|
}
|
|
|
|
if (!$calling_context) {
|
|
if (IssueBuffer::accepts(
|
|
new InaccessibleMethod('Cannot access protected method ' . $method_id, $file_name, $line_number)
|
|
)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (is_subclass_of($method_class, $calling_context) && method_exists($calling_context, $method_name)) {
|
|
return;
|
|
}
|
|
|
|
if (!is_subclass_of($calling_context, $method_class)) {
|
|
if (IssueBuffer::accepts(
|
|
new InaccessibleMethod('Cannot access protected method ' . $method_id . ' from context ' . $calling_context, $file_name, $line_number)
|
|
)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public static function registerInheritedMethod($parent_method_id, $method_id)
|
|
{
|
|
// only register the method if it's not already there
|
|
if (!isset(self::$_declaring_classes[$method_id])) {
|
|
self::$_declaring_classes[$method_id] = $parent_method_id;
|
|
}
|
|
|
|
self::$_inherited_methods[$method_id] = $parent_method_id;
|
|
}
|
|
|
|
public static function getDeclaringMethod($method_id)
|
|
{
|
|
if (isset(self::$_declaring_classes[$method_id])) {
|
|
return self::$_declaring_classes[$method_id];
|
|
}
|
|
|
|
$method_name = explode('::', $method_id)[1];
|
|
|
|
$parent_method_id = (new \ReflectionMethod($method_id))->getDeclaringClass()->getName() . '::' . $method_name;
|
|
|
|
self::$_declaring_classes[$method_id] = $parent_method_id;
|
|
|
|
return $parent_method_id;
|
|
}
|
|
|
|
public static function getNewDocblocksForFile($file_name)
|
|
{
|
|
return isset(self::$_new_docblocks[$file_name]) ? self::$_new_docblocks[$file_name] : [];
|
|
}
|
|
|
|
public static function clearCache()
|
|
{
|
|
self::$_method_comments = [];
|
|
self::$_method_files = [];
|
|
self::$_method_params = [];
|
|
self::$_method_namespaces = [];
|
|
self::$_method_return_types = [];
|
|
self::$_static_methods = [];
|
|
self::$_declaring_classes = [];
|
|
self::$_existing_methods = [];
|
|
self::$_have_reflected = [];
|
|
self::$_have_registered = [];
|
|
self::$_inherited_methods = [];
|
|
self::$_declaring_class = [];
|
|
self::$_method_visibility = [];
|
|
self::$_new_docblocks = [];
|
|
}
|
|
}
|