def analyze_class_attribute_access(itype: Instance, name: str, context: Context, is_lvalue: bool, builtin_type: Callable[[str], Instance], msg: MessageBuilder) -> Type: node = itype.type.get(name) if not node: if itype.type.fallback_to_any: return AnyType() return None is_decorated = isinstance(node.node, Decorator) is_method = is_decorated or isinstance(node.node, FuncDef) if is_lvalue: if is_method: msg.cant_assign_to_method(context) if isinstance(node.node, TypeInfo): msg.fail(messages.CANNOT_ASSIGN_TO_TYPE, context) if itype.type.is_enum and not (is_lvalue or is_decorated or is_method): return itype t = node.type if t: is_classmethod = is_decorated and cast(Decorator, node.node).func.is_class return add_class_tvars(t, itype.type, is_classmethod, builtin_type) elif isinstance(node.node, Var): msg.cannot_determine_type(name, context) return AnyType() if isinstance(node.node, TypeInfo): return type_object_type(cast(TypeInfo, node.node), builtin_type) return function_type(cast(FuncBase, node.node), builtin_type('builtins.function'))
def analyze_class_attribute_access(itype: Instance, name: str, context: Context, is_lvalue: bool, builtin_type: Callable[[str], Instance], msg: MessageBuilder) -> Type: node = itype.type.get(name) if not node: return None is_decorated = isinstance(node.node, Decorator) is_method = is_decorated or isinstance(node.node, FuncDef) if is_lvalue: if is_method: msg.cant_assign_to_method(context) if isinstance(node.node, TypeInfo): msg.fail(messages.CANNOT_ASSIGN_TO_TYPE, context) if itype.type.is_enum and not (is_lvalue or is_decorated or is_method): return itype t = node.type if t: is_classmethod = is_decorated and cast(Decorator, node.node).func.is_class return add_class_tvars(t, itype.type, is_classmethod, builtin_type) elif isinstance(node.node, Var): msg.cannot_determine_type(name, context) return AnyType() if isinstance(node.node, TypeInfo): return type_object_type(cast(TypeInfo, node.node), builtin_type) return function_type(cast(FuncBase, node.node), builtin_type('builtins.function'))
def analyse_member_var_access(name: str, itype: Instance, info: TypeInfo, node: Context, is_lvalue: bool, is_super: bool, msg: MessageBuilder, report_type: Type = None) -> Type: """Analyse attribute access that does not target a method. This is logically part of analyse_member_access and the arguments are similar. """ # It was not a method. Try looking up a variable. v = lookup_member_var_or_accessor(info, name, is_lvalue) vv = v if isinstance(vv, Decorator): # The associated Var node of a decorator contains the type. v = vv.var if isinstance(v, Var): # Found a member variable. var = v itype = map_instance_to_supertype(itype, var.info) if var.type: t = expand_type_by_instance(var.type, itype) if var.is_initialized_in_class and isinstance(t, FunctionLike): if is_lvalue: if var.is_property: msg.read_only_property(name, info, node) else: msg.cant_assign_to_method(node) if not var.is_staticmethod: # Class-level function objects and classmethods become bound # methods: the former to the instance, the latter to the # class. functype = cast(FunctionLike, t) check_method_type(functype, itype, node, msg) signature = method_type(functype) if var.is_property: # A property cannot have an overloaded type => the cast # is fine. return cast(Callable, signature).ret_type else: return signature return t else: if not var.is_ready: msg.cannot_determine_type(var.name(), node) # Implicit 'Any' type. return AnyType() elif isinstance(v, FuncDef): assert False, "Did not expect a function" # Could not find the member. if is_super: msg.undefined_in_superclass(name, node) return AnyType() else: return msg.has_no_attr(report_type or itype, name, node)
def analyse_member_var_access(name: str, itype: Instance, info: TypeInfo, node: Context, is_lvalue: bool, is_super: bool, msg: MessageBuilder, report_type: Type = None) -> Type: """Analyse attribute access that does not target a method. This is logically part of analyse_member_access and the arguments are similar. """ # It was not a method. Try looking up a variable. v = lookup_member_var_or_accessor(info, name, is_lvalue) vv = v if isinstance(vv, Decorator): # The associated Var node of a decorator contains the type. v = vv.var if isinstance(v, Var): # Found a member variable. var = v itype = map_instance_to_supertype(itype, var.info) if var.type: t = expand_type_by_instance(var.type, itype) if (var.is_initialized_in_class and isinstance(t, FunctionLike) and not var.is_staticmethod): # Class-level function object becomes a bound method. functype = cast(FunctionLike, t) check_method_type(functype, itype, node, msg) signature = method_type(functype) if var.is_property: if is_lvalue: msg.read_only_property(name, info, node) # A property cannot have an overloaded type => the cast # is fine. return cast(Callable, signature).ret_type else: return signature return t else: if not var.is_ready: msg.cannot_determine_type(var.name(), node) # Implicit 'Any' type. return AnyType() elif isinstance(v, FuncDef): assert False, "Did not expect a function" # Could not find the member. if is_super: msg.undefined_in_superclass(name, node) return AnyType() else: return msg.has_no_attr(report_type or itype, name, node)
def analyze_var( name: str, var: Var, itype: Instance, info: TypeInfo, node: Context, is_lvalue: bool, msg: MessageBuilder ) -> Type: """Analyze access to an attribute via a Var node. This is conceptually part of analyze_member_access and the arguments are similar. """ # Found a member variable. itype = map_instance_to_supertype(itype, var.info) if var.type: t = expand_type_by_instance(var.type, itype) if var.is_initialized_in_class and isinstance(t, FunctionLike): if is_lvalue: if var.is_property: if not var.is_settable_property: msg.read_only_property(name, info, node) else: msg.cant_assign_to_method(node) if not var.is_staticmethod: # Class-level function objects and classmethods become bound # methods: the former to the instance, the latter to the # class. functype = cast(FunctionLike, t) check_method_type(functype, itype, node, msg) signature = method_type(functype) if var.is_property: # A property cannot have an overloaded type => the cast # is fine. return cast(CallableType, signature).ret_type else: return signature return t else: if not var.is_ready: msg.cannot_determine_type(var.name(), node) # Implicit 'Any' type. return AnyType()
def analyze_var(name: str, var: Var, itype: Instance, info: TypeInfo, node: Context, is_lvalue: bool, msg: MessageBuilder) -> Type: """Analyze access to an attribute via a Var node. This is conceptually part of analyze_member_access and the arguments are similar. """ # Found a member variable. itype = map_instance_to_supertype(itype, var.info) if var.type: t = expand_type_by_instance(var.type, itype) if var.is_initialized_in_class and isinstance(t, FunctionLike): if is_lvalue: if var.is_property: if not var.is_settable_property: msg.read_only_property(name, info, node) else: msg.cant_assign_to_method(node) if not var.is_staticmethod: # Class-level function objects and classmethods become bound # methods: the former to the instance, the latter to the # class. functype = cast(FunctionLike, t) check_method_type(functype, itype, node, msg) signature = method_type(functype) if var.is_property: # A property cannot have an overloaded type => the cast # is fine. return cast(CallableType, signature).ret_type else: return signature return t else: if not var.is_ready: msg.cannot_determine_type(var.name(), node) # Implicit 'Any' type. return AnyType()