def attributes_assigned_in_init_can_be_used_in_methods_when_init_method_is_defined_after_other_method():
init_func = nodes.func(
name="__init__",
args=nodes.args([nodes.arg("self_init")]),
body=[
nodes.assign(
[nodes.attr(nodes.ref("self_init"), "message")],
nodes.str_literal("Hello"),
type=nodes.ref("str"),
)
],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("none")
),
)
node = nodes.class_("User", [
nodes.func(
name="g",
args=nodes.args([nodes.arg("self_g")]),
body=[nodes.ret(nodes.attr(nodes.ref("self_g"), "message"))],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("str")
),
),
init_func,
])
_infer_class_type(node, ["__init__", "g"], [(init_func, ["self_init"])])
def names_in_class_are_not_declared_in_outer_scope():
node = nodes.class_("User", [
nodes.assign([nodes.ref("x")], nodes.none())
])
declarations = find_declarations(node)
assert not declarations.is_declared("x")
def class_definition_base_classes_are_resolved():
ref = nodes.ref("object")
node = nodes.class_("User", [], base_classes=[ref])
declarations = _create_declarations(["User", "object"])
references = resolve(node, declarations)
assert_is(declarations.declaration("object"), references.referenced_declaration(ref))
def attributes_assigned_in_init_can_be_used_outside_of_class():
init_func = nodes.func(
name="__init__",
args=nodes.args([nodes.arg("self_init")]),
body=[
nodes.assign(
[nodes.attr(nodes.ref("self_init"), "message")],
nodes.str_literal("Hello"),
type=nodes.ref("str"),
)
],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("none")
)
)
class_node = nodes.class_("User", [init_func])
node = [
class_node,
nodes.assign([nodes.ref("x")], nodes.attr(nodes.call(nodes.ref("User"), []), "message")),
]
context = _update_context(node, declared_names_in_node=NodeDict([
(class_node, ["Self", "__init__"]),
(init_func, ["self_init"]),
]))
assert_equal(types.str_type, context.lookup_name("x"))
def method_can_call_method_on_same_instance_defined_later_in_body():
node = nodes.class_("User", [
nodes.func(
name="f",
args=nodes.args([nodes.arg("self_f")]),
body=[
nodes.ret(nodes.call(nodes.attr(nodes.ref("self_f"), "g"), []))
],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("none")
),
),
nodes.func(
name="g",
args=nodes.args([nodes.arg("self_g")]),
body=[
nodes.ret(nodes.call(nodes.attr(nodes.ref("self_g"), "f"), []))
],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("none")
),
)
])
_infer_class_type(node, ["f", "g"])
def init_method_cannot_call_other_methods():
node = nodes.class_("User", [
nodes.func(
name="__init__",
args=nodes.args([nodes.arg("self_init")]),
body=[
nodes.assign([nodes.ref("x")], nodes.call(nodes.attr(nodes.ref("self_init"), "g"), []))
],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("none")
),
),
nodes.func(
name="g",
args=nodes.args([nodes.arg("self_g")]),
body=[],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("none")
),
),
])
try:
_infer_class_type(node, ["__init__", "g"])
assert False, "Expected error"
except errors.InitMethodCannotGetSelfAttributes as error:
assert_equal("__init__ methods cannot get attributes of self", str(error))
def break_is_not_valid_in_class_in_while_loop_body():
break_node = nodes.break_()
func_node = nodes.class_("User", [break_node])
node = nodes.while_(nodes.bool_literal(True), [func_node], [])
error = assert_raises(errors.TypeCheckError,
lambda: check_loop_control(node, False))
assert_equal(break_node, error.node)
assert_equal("'break' outside loop", str(error))
def attributes_with_function_type_defined_in_class_definition_body_are_not_present_on_meta_type():
node = nodes.class_("User", [
nodes.assign([nodes.ref("is_person")], nodes.ref("true_func")),
])
meta_type = _infer_meta_type(node, ["is_person"], type_bindings={
"true_func": types.func([types.object_type], types.none_type)
})
assert "is_person" not in meta_type.attrs
def class_definition_bodies_can_access_variables_from_outer_scope():
ref = nodes.ref("x")
node = nodes.class_("User", [nodes.expression_statement(ref)])
declarations = _create_declarations(["x", "User"])
references = resolve(node, declarations)
assert_is(declarations.declaration("x"), references.referenced_declaration(ref))
def declarations_in_class_include_declarations_in_body():
node = nodes.class_("User", [
nodes.assign([nodes.ref("x")], nodes.none())
])
declarations = _declarations_in(node)
assert isinstance(declarations.declaration("x"), name_declaration.VariableDeclarationNode)
assert not declarations.is_declared("User")
def error_if_base_class_is_not_object():
type_bindings = {"Person": types.meta_type(types.class_type("Person"))}
node = nodes.class_("User", [], base_classes=[nodes.ref("Person")])
try:
_infer_class_type(node, [], type_bindings=type_bindings)
assert False, "Expected error"
except errors.UnsupportedError as error:
assert_equal("base classes other than 'object' are not supported", str(error))
def test_function_definitions_in_body_are_stored_as_methods(self):
_assert_transform(
nodes.class_("Blah", [nodes.func("f", nodes.args([]), [], type=None)]),
cc.class_(
"Blah",
methods=[cc.func("f", [], [cc.ret(cc.none)])],
body=[cc.declare("f")],
),
)
def _create_class_with_init(signature, args, body):
return nodes.class_("User", [
nodes.func(
name="__init__",
args=args,
body=body,
type=signature
)
])
def class_definitions_assignments_shadow_variables_of_same_name_in_outer_scope():
ref = nodes.ref("x")
body = [nodes.assign([ref], nodes.none())]
node = nodes.class_("User", body)
declarations = _create_declarations(["x", "User"])
references = resolve(node, declarations)
assert_is_not(declarations.declaration("x"), references.referenced_declaration(ref))
def init_must_be_function_definition():
func_node = nodes.assign([nodes.ref("__init__")], nodes.ref("f"))
node = nodes.class_("User", [func_node])
try:
_infer_class_type(node, ["__init__"], type_bindings={
"f": types.func([types.object_type], types.str_type)
})
assert False, "Expected error"
except errors.InitAttributeMustBeFunctionDefinitionError as error:
assert_equal(func_node, error.node)
def method_can_reference_later_function_if_class_is_not_used_in_the_interim():
g_ref = nodes.ref("g")
f = nodes.func("f", type=None, args=nodes.Arguments([]), body=[
nodes.ret(nodes.call(g_ref, []))
])
g = nodes.func("g", type=None, args=nodes.Arguments([]), body=[])
_updated_bindings(nodes.module([
nodes.class_("a", [f]),
g,
]))
def method_signature_is_checked_when_defined_by_assignment():
func_node = nodes.assign([nodes.ref("is_person")], nodes.ref("f"))
node = nodes.class_("User", [func_node])
try:
_infer_class_type(node, ["is_person"], type_bindings={
"f": types.func([], types.bool_type)
})
assert False, "Expected error"
except errors.MethodHasNoArgumentsError as error:
assert_equal(func_node, error.node)
assert_equal("is_person", error.attr_name)
def class_definition_functions_ignore_class_scope_when_resolving_references():
ref = nodes.ref("x")
node = nodes.class_("User", [
nodes.assign([nodes.ref("x")], nodes.none()),
nodes.func("f", nodes.args([]), [nodes.ret(ref)], type=None),
])
declarations = _create_declarations(["x", "User"])
references = resolve(node, declarations)
assert_is(declarations.declaration("x"), references.referenced_declaration(ref))
def test_assignments_in_body_are_transformed(self):
_assert_transform(
nodes.class_("Blah", [nodes.assign([nodes.ref("value")], nodes.none())]),
cc.class_(
"Blah",
methods=[],
body=[
cc.declare("value"),
cc.assign(cc.ref("value"), cc.none),
],
),
)
def attributes_with_function_type_defined_in_class_definition_body_are_bound_to_class_type():
node = nodes.class_("User", [
nodes.func(
name="is_person",
args=nodes.args([nodes.arg("self")]),
body=[nodes.ret(nodes.bool_literal(True))],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("Self"))],
returns=nodes.ref("bool")
),
),
])
class_type = _infer_class_type(node, ["is_person"])
assert_equal(types.func([], types.bool_type), class_type.attrs.type_of("is_person"))
def first_argument_in_method_signature_can_be_strict_supertype_of_class():
node = nodes.class_("User", [
nodes.func(
name="is_person",
args=nodes.args([nodes.arg("self")]),
body=[nodes.ret(nodes.bool_literal(True))],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("object"))],
returns=nodes.ref("bool")
),
)
])
class_type = _infer_class_type(node, ["is_person"])
assert_equal(types.func([], types.bool_type), class_type.attrs.type_of("is_person"))
def class_cannot_be_referenced_if_method_dependencies_are_not_bound():
g_ref = nodes.ref("g")
f = nodes.func("f", type=None, args=nodes.Arguments([]), body=[
nodes.ret(nodes.call(g_ref, []))
])
g = nodes.func("g", type=None, args=nodes.Arguments([]), body=[])
try:
_updated_bindings(nodes.module([
nodes.class_("a", [f]),
nodes.expression_statement(nodes.ref("a")),
g,
]))
assert False, "Expected error"
except errors.UnboundLocalError as error:
assert_equal(g_ref, error.node)
def methods_must_have_at_least_one_argument():
func_node = nodes.func(
name="is_person",
args=nodes.args([]),
body=[nodes.ret(nodes.bool_literal(True))],
type=nodes.signature(
args=[],
returns=nodes.ref("bool")
)
)
node = nodes.class_("User", [func_node])
try:
_infer_class_type(node, ["is_person"])
assert False, "Expected error"
except errors.MethodHasNoArgumentsError as error:
assert_equal(func_node, error.node)
assert_equal("'is_person' method must have at least one argument", str(error))
def self_argument_in_method_signature_cannot_be_unrelated_type():
func_node = nodes.func(
name="is_person",
args=nodes.args([nodes.arg("self")]),
body=[nodes.ret(nodes.bool_literal(True))],
type=nodes.signature(
args=[nodes.signature_arg(nodes.ref("bool"))],
returns=nodes.ref("bool")
),
)
node = nodes.class_("User", [func_node])
try:
_infer_class_type(node, ["is_person"])
assert False, "Expected error"
except errors.UnexpectedReceiverTypeError as error:
assert_equal(func_node, error.node)
assert_equal(types.bool_type, error.receiver_type)
assert_equal("first argument of methods should have Self type but was 'bool'", str(error))
def can_assign_literal_to_attribute():
init_func = nodes.func(
name="__init__",
args=nodes.args([nodes.arg("self")]),
body=[
nodes.assign(
[nodes.attr(nodes.ref("self"), "value")],
nodes.none(),
)
],
type=_no_arg_init_signature,
)
node = nodes.class_("Box", [
init_func
])
class_type = _infer_class_type(
node,
["__init__"],
[(init_func, ["self"])])
assert_equal(types.none_type, class_type.attrs.type_of("value"))
def error_is_raised_if_attribute_assignment_has_no_explicit_and_not_literal_nor_argument_value():
init_func = nodes.func(
name="__init__",
args=nodes.args([nodes.arg("self")]),
body=[
nodes.assign(
[nodes.attr(nodes.ref("self"), "message")],
nodes.ref("message"),
)
],
type=_no_arg_init_signature,
)
node = nodes.class_("User", [
init_func
])
error = assert_raises(errors.ClassAttributeTypeError,
lambda: _infer_class_type(
node,
["__init__"],
[(init_func, ["self"])],
type_bindings={"message": types.str_type}))
assert_equal("Could not infer type of attribute. Attribute assignments must be explicitly typed, or a literal, or an argument", str(error))
def can_assign_any_value_to_attribute_if_assignment_is_explicitly_typed():
init_func = nodes.func(
name="__init__",
args=nodes.args([nodes.arg("self")]),
body=[
nodes.assign(
[nodes.attr(nodes.ref("self"), "message")],
nodes.ref("message"),
type=nodes.ref("str"),
)
],
type=_no_arg_init_signature,
)
node = nodes.class_("User", [
init_func
])
class_type = _infer_class_type(
node,
["__init__"],
[(init_func, ["self"])],
type_bindings={"message": types.str_type})
assert_equal(types.str_type, class_type.attrs.type_of("message"))
def class_definition_is_resolved_to_class_declaration():
node = nodes.class_("User", [])
declarations = _create_declarations(["User"])
references = resolve(node, declarations)
assert_is(declarations.declaration("User"), references.referenced_declaration(node))
def test_parse_class_with_generics():
expected_node = nodes.class_("Option", [], type_params=[nodes.formal_type_parameter("T")])
_assert_statement_parse(expected_node, "#:generic T\nclass Option:\n pass")
def test_parse_class_with_base_classes():
expected_node = nodes.class_("User", [], base_classes=[nodes.ref("Person")])
_assert_statement_parse(expected_node, "class User(Person):\n pass")
