PHP Context::getClassInScope方法代码示例

 /**
  * @param Node $node
  * A node of the type indicated by the method name that we'd
  * like to figure out the type that it produces.
  *
  * @return string
  * The class name represented by the given call
  */
 public function visitProp(Node $node) : string
 {
     if (!($node->children['expr']->kind == \ast\AST_VAR && !$node->children['expr']->children['name'] instanceof Node)) {
         return '';
     }
     // $var->prop->method()
     $var = $node->children['expr'];
     $class = null;
     if ($var->children['name'] == 'this') {
         // If we're not in a class scope, 'this' won't work
         if (!$this->context->isInClassScope()) {
             Log::err(Log::ESTATIC, 'Using $this when not in object context', $this->context->getFile(), $node->lineno);
             return '';
         }
         // $this->$node->method()
         if ($node->children['prop'] instanceof Node) {
             // Too hard. Giving up.
             return '';
         }
         $class = $this->context->getClassInScope($this->code_base);
     } else {
         // Get the list of viable class types for the
         // variable
         $union_type = AST::varUnionType($this->context, $var)->nonNativeTypes()->nonGenericArrayTypes();
         if ($union_type->isEmpty()) {
             return '';
         }
         $class_fqsen = $union_type->head()->asFQSEN();
         if (!$this->code_base->hasClassWithFQSEN($class_fqsen)) {
             return '';
         }
         $class = $this->code_base->getClassByFQSEN($class_fqsen);
     }
     $property_name = $node->children['prop'];
     if (!$class->hasPropertyWithName($this->code_base, $property_name)) {
         // If we can't find the property, there's
         // no type. Thie issue should be caught
         // elsewhere.
         return '';
     }
     try {
         $property = $class->getPropertyByNameInContext($this->code_base, $property_name, $this->context);
     } catch (AccessException $exception) {
         Log::err(Log::EACCESS, $exception->getMessage(), $this->context->getFile(), $node->lineno);
         return '';
     }
     $union_type = $property->getUnionType()->nonNativeTypes();
     if ($union_type->isEmpty()) {
         // If we don't have a type on the property we
         // can't figure out the class type.
         return '';
     } else {
         // Return the first type on the property
         // that could be a reference to a class
         return (string) $union_type->head()->asFQSEN();
     }
     // No such property was found, or none were classes
     // that could be found
     return '';
 }

 /**
  * @param Node $node
  * A node to parse
  *
  * @return Context
  * A new or an unchanged context resulting from
  * parsing the node
  */
 public function visitReturn(Node $node) : Context
 {
     // Don't check return types in traits
     if ($this->context->isInClassScope()) {
         $clazz = $this->context->getClassInScope($this->code_base);
         if ($clazz->isTrait()) {
             return $this->context;
         }
     }
     // Make sure we're actually returning from a method.
     if (!$this->context->isMethodScope() && !$this->context->isClosureScope()) {
         return $this->context;
     }
     // Get the method/function/closure we're in
     $method = null;
     if ($this->context->isClosureScope()) {
         $method = $this->context->getClosureInScope($this->code_base);
     } else {
         if ($this->context->isMethodScope()) {
             $method = $this->context->getMethodInScope($this->code_base);
         }
     }
     assert(!empty($method), "We're supposed to be in either method or closure scope.");
     // Figure out what we intend to return
     $method_return_type = $method->getUnionType();
     // Figure out what is actually being returned
     $expression_type = UnionType::fromNode($this->context, $this->code_base, $node->children['expr']);
     // If there is no declared type, see if we can deduce
     // what it should be based on the return type
     if ($method_return_type->isEmpty() || $method->isReturnTypeUndefined()) {
         $method->setIsReturnTypeUndefined(true);
         // Set the inferred type of the method based
         // on what we're returning
         $method->getUnionType()->addUnionType($expression_type);
         // No point in comparing this type to the
         // type we just set
         return $this->context;
     }
     if (!$method->isReturnTypeUndefined() && !$expression_type->canCastToExpandedUnionType($method_return_type, $this->code_base)) {
         Issue::emit(Issue::TypeMismatchReturn, $this->context->getFile(), $node->lineno ?? 0, (string) $expression_type, $method->getName(), (string) $method_return_type);
     }
     if ($method->isReturnTypeUndefined()) {
         // Add the new type to the set of values returned by the
         // method
         $method->getUnionType()->addUnionType($expression_type);
     }
     return $this->context;
 }

 private function visitClassNode(Node $node) : UnionType
 {
     // Things of the form `new $class_name();`
     if ($node->kind == \ast\AST_VAR) {
         return new UnionType();
     }
     // Anonymous class of form `new class { ... }`
     if ($node->kind == \ast\AST_CLASS && $node->flags & \ast\flags\CLASS_ANONYMOUS) {
         // Generate a stable name for the anonymous class
         $anonymous_class_name = (new ContextNode($this->code_base, $this->context, $node))->getUnqualifiedNameForAnonymousClass();
         // Turn that into a fully qualified name
         $fqsen = FullyQualifiedClassName::fromStringInContext($anonymous_class_name, $this->context);
         // Turn that into a union type
         return Type::fromFullyQualifiedString((string) $fqsen)->asUnionType();
     }
     // Things of the form `new $method->name()`
     if ($node->kind !== \ast\AST_NAME) {
         return new UnionType();
     }
     // Get the name of the class
     $class_name = $node->children['name'];
     // If this is a straight-forward class name, recurse into the
     // class node and get its type
     if (!Type::isSelfTypeString($class_name)) {
         // TODO: does anyone else call this method?
         return self::unionTypeFromClassNode($this->code_base, $this->context, $node);
     }
     // This is a self-referential node
     if (!$this->context->isInClassScope()) {
         Log::err(Log::ESTATIC, "Cannot access {$class_name} when not in a class scope", $this->context->getFile(), $node->lineno);
         return new UnionType();
     }
     // Reference to a parent class
     if ($class_name === 'parent') {
         $class = $this->context->getClassInScope($this->code_base);
         if (!$class->hasParentClassFQSEN()) {
             Log::err(Log::ESTATIC, "Reference to parent of parentless class {$class->getFQSEN()}", $this->context->getFile(), $node->lineno);
             return new UnionType();
         }
         return Type::fromFullyQualifiedString((string) $class->getParentClassFQSEN())->asUnionType();
     }
     return Type::fromFullyQualifiedString((string) $this->context->getClassFQSEN())->asUnionType();
 }

 /**
  * @param Node $node
  * A node to parse
  *
  * @return Context
  * A new or an unchanged context resulting from
  * parsing the node
  */
 public function visitReturn(Node $node) : Context
 {
     // Don't check return types in traits
     if ($this->context->isInClassScope()) {
         $clazz = $this->context->getClassInScope($this->code_base);
         if ($clazz->isTrait()) {
             return $this->context;
         }
     }
     // Make sure we're actually returning from a method.
     if (!$this->context->isMethodScope() && !$this->context->isClosureScope()) {
         return $this->context;
     }
     // Get the method/function/closure we're in
     $method = null;
     if ($this->context->isClosureScope()) {
         $method = $this->context->getClosureInScope($this->code_base);
     } else {
         if ($this->context->isMethodScope()) {
             $method = $this->context->getMethodInScope($this->code_base);
         } else {
             assert(false, "We're supposed to be in either method or closure scope.");
         }
     }
     // Figure out what we intend to return
     $method_return_type = $method->getUnionType();
     // Figure out what is actually being returned
     $expression_type = UnionType::fromNode($this->context, $this->code_base, $node->children['expr']);
     // If there is no declared type, see if we can deduce
     // what it should be based on the return type
     if ($method_return_type->isEmpty()) {
         // Set the inferred type of the method based
         // on what we're returning
         $method->getUnionType()->addUnionType($expression_type);
         // No point in comparing this type to the
         // type we just set
         return $this->context;
     }
     if (!$expression_type->canCastToExpandedUnionType($method_return_type, $this->code_base)) {
         Log::err(Log::ETYPE, "return {$expression_type} but {$method->getName()}() is declared to return {$method_return_type}", $this->context->getFile(), $node->lineno);
     }
     return $this->context;
 }

 /**
  * @param Node $node
  * A node of the type indicated by the method name that we'd
  * like to figure out the type that it produces.
  *
  * @return string
  * The class name represented by the given call
  */
 public function visitNew(Node $node) : string
 {
     // Things of the form `new $class_name();`
     if ($node->children['class']->kind == \ast\AST_VAR) {
         return '';
     }
     // Anonymous class
     // $v = new class { ... }
     if ($node->children['class']->kind == \ast\AST_CLASS && $node->children['class']->flags & \ast\flags\CLASS_ANONYMOUS) {
         return AST::unqualifiedNameForAnonymousClassNode($node->children['class'], $this->context);
     }
     // Things of the form `new $method->name()`
     if ($node->children['class']->kind !== \ast\AST_NAME) {
         return '';
     }
     $class_name = $node->children['class']->children['name'];
     if (!in_array($class_name, ['self', 'static', 'parent'])) {
         return (string) UnionTypeVisitor::unionTypeFromClassNode($this->code_base, $this->context, $node->children['class']);
     }
     if (!$this->context->isInClassScope()) {
         Log::err(Log::ESTATIC, "Cannot access {$class_name}:: when no class scope is active", $this->context->getFile(), $node->lineno);
         return '';
     }
     if ($class_name == 'static') {
         return (string) $this->context->getClassFQSEN();
     }
     if ($class_name == 'self') {
         if ($this->context->isGlobalScope()) {
             assert(false, "Unimplemented branch is required for {$this->context}");
         } else {
             return (string) $this->context->getClassFQSEN();
         }
     }
     if ($class_name == 'parent') {
         $clazz = $this->context->getClassInScope($this->code_base);
         if (!$clazz->hasParentClassFQSEN()) {
             return '';
         }
         return (string) $clazz->getParentClassFQSEN();
     }
     return '';
 }

 /**
  * @param string $name
  * The name of the property
  *
  * @param Context $context
  * The context of the caller requesting the property
  *
  * @return Property
  * A property with the given name
  *
  * @throws IssueException
  * An exception may be thrown if the caller does not
  * have access to the given property from the given
  * context
  */
 public function getPropertyByNameInContext(CodeBase $code_base, string $name, Context $context) : Property
 {
     // Get the FQSEN of the property we're looking for
     $property_fqsen = FullyQualifiedPropertyName::make($this->getFQSEN(), $name);
     $property = null;
     // Figure out if we have the property
     $has_property = $code_base->hasPropertyWithFQSEN($property_fqsen);
     // Figure out if the property is accessible
     $is_property_accessible = false;
     if ($has_property) {
         $property = $code_base->getPropertyByFQSEN($property_fqsen);
         $is_remote_access = !$context->isInClassScope() || !$context->getClassInScope($code_base)->getUnionType()->canCastToExpandedUnionType($this->getUnionType(), $code_base);
         $is_property_accessible = !$is_remote_access || $property->isPublic();
     }
     // If the property exists and is accessible, return it
     if ($is_property_accessible) {
         return $property;
     }
     // Check to see if we can use a __get magic method
     if ($this->hasMethodWithName($code_base, '__get')) {
         $method = $this->getMethodByName($code_base, '__get');
         // Make sure the magic method is accessible
         if ($method->isPrivate()) {
             throw new IssueException(Issue::fromType(Issue::AccessPropertyPrivate)($context->getFile(), $context->getLineNumberStart(), [(string) $property_fqsen]));
         } else {
             if ($method->isProtected()) {
                 throw new IssueException(Issue::fromType(Issue::AccessPropertyProtected)($context->getFile(), $context->getLineNumberStart(), [(string) $property_fqsen]));
             }
         }
         $property = new Property($context, $name, $method->getUnionType(), 0, $property_fqsen);
         $this->addProperty($code_base, $property, new None());
         return $property;
     } else {
         if ($has_property) {
             // If we have a property, but its inaccessible, emit
             // an issue
             if ($property->isPrivate()) {
                 throw new IssueException(Issue::fromType(Issue::AccessPropertyPrivate)($context->getFile(), $context->getLineNumberStart(), ["{$this->getFQSEN()}::\${$property->getName()}"]));
             }
             if ($property->isProtected()) {
                 throw new IssueException(Issue::fromType(Issue::AccessPropertyProtected)($context->getFile(), $context->getLineNumberStart(), ["{$this->getFQSEN()}::\${$property->getName()}"]));
             }
         }
     }
     // Check to see if missing properties are allowed
     // or we're stdclass
     if (Config::get()->allow_missing_properties || $this->getFQSEN() == FullyQualifiedClassName::getStdClassFQSEN()) {
         $property = new Property($context, $name, new UnionType(), 0, $property_fqsen);
         $this->addProperty($code_base, $property, new None());
         return $property;
     }
     throw new IssueException(Issue::fromType(Issue::UndeclaredProperty)($context->getFile(), $context->getLineNumberStart(), ["{$this->getFQSEN()}::\${$name}}"]));
 }

 /**
  * @param CodeBase $code_base
  * The code base in which to find classes
  *
  * @param Context $context
  * The context in which we're resolving this union
  * type.
  *
  * @return Clazz[]
  * A list of classes representing the non-native types
  * associated with this UnionType
  *
  * @throws CodeBaseException
  * An exception is thrown if a non-native type does not have
  * an associated class
  */
 public function asClassList(CodeBase $code_base, Context $context)
 {
     // Iterate over each viable class type to see if any
     // have the constant we're looking for
     foreach ($this->nonNativeTypes()->getTypeSet() as $class_type) {
         // Get the class FQSEN
         $class_fqsen = $class_type->asFQSEN();
         if ($class_type->isStaticType()) {
             if (!$context->isInClassScope()) {
                 throw new IssueException(Issue::fromType(Issue::ContextNotObject)($context->getFile(), $context->getLineNumberStart(), [(string) $class_type]));
             }
             (yield $context->getClassInScope($code_base));
         } else {
             // See if the class exists
             if (!$code_base->hasClassWithFQSEN($class_fqsen)) {
                 throw new CodeBaseException($class_fqsen, "Cannot find class {$class_fqsen}");
             }
             (yield $code_base->getClassByFQSEN($class_fqsen));
         }
     }
 }

 /**
  * @param Node $node
  * A node of the type indicated by the method name that we'd
  * like to figure out the type that it produces.
  *
  * @return string
  * The class name represented by the given call
  */
 public function visitMethodCall(Node $node) : string
 {
     if ($node->children['expr']->kind == \ast\AST_VAR) {
         if ($node->children['expr']->children['name'] instanceof Node) {
             return '';
         }
         // $var->method()
         if ($node->children['expr']->children['name'] == 'this') {
             if (!$this->context->isInClassScope()) {
                 Log::err(Log::ESTATIC, 'Using $this when not in object context', $this->context->getFile(), $node->lineno);
                 return '';
             }
             return (string) $this->context->getClassFQSEN();
         }
         $variable_name = $node->children['expr']->children['name'];
         if (!$this->context->getScope()->hasVariableWithName($variable_name)) {
             // Got lost, couldn't find the variable in the current scope
             // If it really isn't defined, it will be caught by the
             // undefined var error
             return '';
         }
         $variable = $this->context->getScope()->getVariableWithName($variable_name);
         // Hack - loop through the possible types of the var and assume
         // first found class is correct
         foreach ($variable->getUnionType()->nonGenericArrayTypes()->getTypeList() as $type) {
             $child_class_fqsen = FullyQualifiedClassName::fromStringInContext((string) $type, $this->context);
             if ($this->code_base->hasClassWithFQSEN($child_class_fqsen)) {
                 return (string) FullyQualifiedClassName::fromStringInContext((string) $type, $this->context);
             }
         }
         // Could not find name
         return '';
     }
     if ($node->children['expr']->kind == \ast\AST_PROP) {
         $prop = $node->children['expr'];
         if (!($prop->children['expr']->kind == \ast\AST_VAR && !$prop->children['expr']->children['name'] instanceof Node)) {
             return '';
         }
         // $var->prop->method()
         $var = $prop->children['expr'];
         if ($var->children['name'] == 'this') {
             // If we're not in a class scope, 'this' won't work
             if (!$this->context->isInClassScope()) {
                 Log::err(Log::ESTATIC, 'Using $this when not in object context', $this->context->getFile(), $node->lineno);
                 return '';
             }
             // $this->$prop->method()
             if ($prop->children['prop'] instanceof Node) {
                 // Too hard. Giving up.
                 return '';
             }
             $class = $this->context->getClassInScope($this->code_base);
             $property_name = $prop->children['prop'];
             if (!$class->hasPropertyWithName($this->code_base, $property_name)) {
                 // If we can't find the property, there's
                 // no type. Thie issue should be caught
                 // elsewhere.
                 return '';
             }
             try {
                 $property = $class->getPropertyByNameInContext($this->code_base, $property_name, $this->context);
             } catch (AccessException $exception) {
                 Log::err(Log::EACCESS, $exception->getMessage(), $this->context->getFile(), $node->lineno);
                 return '';
             }
             $union_type = $property->getUnionType()->nonNativeTypes();
             if ($union_type->isEmpty()) {
                 // If we don't have a type on the property we
                 // can't figure out the class type.
                 return '';
             } else {
                 // Return the first type on the property
                 // that could be a reference to a class
                 return (string) $union_type->head()->asFQSEN();
             }
             // No such property was found, or none were classes
             // that could be found
             return '';
         }
         return '';
     }
     if ($node->children['expr']->kind == \ast\AST_METHOD_CALL) {
         // Get the type returned by the first method
         // call.
         $union_type = UnionType::fromNode($this->context, $this->code_base, $node->children['expr']);
         // Find the subset of types that are viable
         // classes
         $viable_class_types = $union_type->nonNativeTypes()->nonGenericArrayTypes();
         // If there are no non-native types, give up
         if ($viable_class_types->isEmpty()) {
             return '';
         }
//.........这里部分代码省略.........