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testtypes.py
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testtypes.py
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"""Test cases for mypy types and type operations."""
from __future__ import annotations
from mypy.erasetype import erase_type, remove_instance_last_known_values
from mypy.expandtype import expand_type
from mypy.indirection import TypeIndirectionVisitor
from mypy.join import join_simple, join_types
from mypy.meet import meet_types, narrow_declared_type
from mypy.nodes import (
ARG_NAMED,
ARG_OPT,
ARG_POS,
ARG_STAR,
ARG_STAR2,
CONTRAVARIANT,
COVARIANT,
INVARIANT,
ArgKind,
CallExpr,
Expression,
NameExpr,
)
from mypy.options import Options
from mypy.plugins.common import find_shallow_matching_overload_item
from mypy.state import state
from mypy.subtypes import is_more_precise, is_proper_subtype, is_same_type, is_subtype
from mypy.test.helpers import Suite, assert_equal, assert_type, skip
from mypy.test.typefixture import InterfaceTypeFixture, TypeFixture
from mypy.typeops import false_only, make_simplified_union, true_only
from mypy.types import (
AnyType,
CallableType,
Instance,
LiteralType,
NoneType,
Overloaded,
ProperType,
TupleType,
Type,
TypeOfAny,
TypeType,
TypeVarId,
TypeVarType,
UnboundType,
UninhabitedType,
UnionType,
get_proper_type,
has_recursive_types,
)
class TypesSuite(Suite):
def setUp(self) -> None:
self.x = UnboundType("X") # Helpers
self.y = UnboundType("Y")
self.fx = TypeFixture()
self.function = self.fx.function
def test_any(self) -> None:
assert_equal(str(AnyType(TypeOfAny.special_form)), "Any")
def test_simple_unbound_type(self) -> None:
u = UnboundType("Foo")
assert_equal(str(u), "Foo?")
def test_generic_unbound_type(self) -> None:
u = UnboundType("Foo", [UnboundType("T"), AnyType(TypeOfAny.special_form)])
assert_equal(str(u), "Foo?[T?, Any]")
def test_callable_type(self) -> None:
c = CallableType(
[self.x, self.y],
[ARG_POS, ARG_POS],
[None, None],
AnyType(TypeOfAny.special_form),
self.function,
)
assert_equal(str(c), "def (X?, Y?) -> Any")
c2 = CallableType([], [], [], NoneType(), self.fx.function)
assert_equal(str(c2), "def ()")
def test_callable_type_with_default_args(self) -> None:
c = CallableType(
[self.x, self.y],
[ARG_POS, ARG_OPT],
[None, None],
AnyType(TypeOfAny.special_form),
self.function,
)
assert_equal(str(c), "def (X?, Y? =) -> Any")
c2 = CallableType(
[self.x, self.y],
[ARG_OPT, ARG_OPT],
[None, None],
AnyType(TypeOfAny.special_form),
self.function,
)
assert_equal(str(c2), "def (X? =, Y? =) -> Any")
def test_callable_type_with_var_args(self) -> None:
c = CallableType(
[self.x], [ARG_STAR], [None], AnyType(TypeOfAny.special_form), self.function
)
assert_equal(str(c), "def (*X?) -> Any")
c2 = CallableType(
[self.x, self.y],
[ARG_POS, ARG_STAR],
[None, None],
AnyType(TypeOfAny.special_form),
self.function,
)
assert_equal(str(c2), "def (X?, *Y?) -> Any")
c3 = CallableType(
[self.x, self.y],
[ARG_OPT, ARG_STAR],
[None, None],
AnyType(TypeOfAny.special_form),
self.function,
)
assert_equal(str(c3), "def (X? =, *Y?) -> Any")
def test_tuple_type(self) -> None:
options = Options()
options.force_uppercase_builtins = True
assert_equal(TupleType([], self.fx.std_tuple).str_with_options(options), "Tuple[]")
assert_equal(TupleType([self.x], self.fx.std_tuple).str_with_options(options), "Tuple[X?]")
assert_equal(
TupleType(
[self.x, AnyType(TypeOfAny.special_form)], self.fx.std_tuple
).str_with_options(options),
"Tuple[X?, Any]",
)
def test_type_variable_binding(self) -> None:
assert_equal(str(TypeVarType("X", "X", 1, [], self.fx.o)), "X`1")
assert_equal(str(TypeVarType("X", "X", 1, [self.x, self.y], self.fx.o)), "X`1")
def test_generic_function_type(self) -> None:
c = CallableType(
[self.x, self.y],
[ARG_POS, ARG_POS],
[None, None],
self.y,
self.function,
name=None,
variables=[TypeVarType("X", "X", -1, [], self.fx.o)],
)
assert_equal(str(c), "def [X] (X?, Y?) -> Y?")
v = [TypeVarType("Y", "Y", -1, [], self.fx.o), TypeVarType("X", "X", -2, [], self.fx.o)]
c2 = CallableType([], [], [], NoneType(), self.function, name=None, variables=v)
assert_equal(str(c2), "def [Y, X] ()")
def test_type_alias_expand_once(self) -> None:
A, target = self.fx.def_alias_1(self.fx.a)
assert get_proper_type(A) == target
assert get_proper_type(target) == target
A, target = self.fx.def_alias_2(self.fx.a)
assert get_proper_type(A) == target
assert get_proper_type(target) == target
def test_type_alias_expand_all(self) -> None:
A, _ = self.fx.def_alias_1(self.fx.a)
assert A.expand_all_if_possible() is None
A, _ = self.fx.def_alias_2(self.fx.a)
assert A.expand_all_if_possible() is None
B = self.fx.non_rec_alias(self.fx.a)
C = self.fx.non_rec_alias(TupleType([B, B], Instance(self.fx.std_tuplei, [B])))
assert C.expand_all_if_possible() == TupleType(
[self.fx.a, self.fx.a], Instance(self.fx.std_tuplei, [self.fx.a])
)
def test_recursive_nested_in_non_recursive(self) -> None:
A, _ = self.fx.def_alias_1(self.fx.a)
T = TypeVarType("T", "T", -1, [], self.fx.o)
NA = self.fx.non_rec_alias(Instance(self.fx.gi, [T]), [T], [A])
assert not NA.is_recursive
assert has_recursive_types(NA)
def test_indirection_no_infinite_recursion(self) -> None:
A, _ = self.fx.def_alias_1(self.fx.a)
visitor = TypeIndirectionVisitor()
modules = A.accept(visitor)
assert modules == {"__main__", "builtins"}
A, _ = self.fx.def_alias_2(self.fx.a)
visitor = TypeIndirectionVisitor()
modules = A.accept(visitor)
assert modules == {"__main__", "builtins"}
class TypeOpsSuite(Suite):
def setUp(self) -> None:
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
# expand_type
def test_trivial_expand(self) -> None:
for t in (
self.fx.a,
self.fx.o,
self.fx.t,
self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a),
self.fx.anyt,
):
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
def test_trivial_expand_recursive(self) -> None:
A, _ = self.fx.def_alias_1(self.fx.a)
self.assert_expand(A, [], A)
A, _ = self.fx.def_alias_2(self.fx.a)
self.assert_expand(A, [], A)
def test_expand_naked_type_var(self) -> None:
self.assert_expand(self.fx.t, [(self.fx.t.id, self.fx.a)], self.fx.a)
self.assert_expand(self.fx.t, [(self.fx.s.id, self.fx.a)], self.fx.t)
def test_expand_basic_generic_types(self) -> None:
self.assert_expand(self.fx.gt, [(self.fx.t.id, self.fx.a)], self.fx.ga)
# IDEA: Add test cases for
# tuple types
# callable types
# multiple arguments
def assert_expand(
self, orig: Type, map_items: list[tuple[TypeVarId, Type]], result: Type
) -> None:
lower_bounds = {}
for id, t in map_items:
lower_bounds[id] = t
exp = expand_type(orig, lower_bounds)
# Remove erased tags (asterisks).
assert_equal(str(exp).replace("*", ""), str(result))
# erase_type
def test_trivial_erase(self) -> None:
for t in (self.fx.a, self.fx.o, self.fx.nonet, self.fx.anyt):
self.assert_erase(t, t)
def test_erase_with_type_variable(self) -> None:
self.assert_erase(self.fx.t, self.fx.anyt)
def test_erase_with_generic_type(self) -> None:
self.assert_erase(self.fx.ga, self.fx.gdyn)
self.assert_erase(self.fx.hab, Instance(self.fx.hi, [self.fx.anyt, self.fx.anyt]))
def test_erase_with_generic_type_recursive(self) -> None:
tuple_any = Instance(self.fx.std_tuplei, [AnyType(TypeOfAny.explicit)])
A, _ = self.fx.def_alias_1(self.fx.a)
self.assert_erase(A, tuple_any)
A, _ = self.fx.def_alias_2(self.fx.a)
self.assert_erase(A, UnionType([self.fx.a, tuple_any]))
def test_erase_with_tuple_type(self) -> None:
self.assert_erase(self.tuple(self.fx.a), self.fx.std_tuple)
def test_erase_with_function_type(self) -> None:
self.assert_erase(
self.fx.callable(self.fx.a, self.fx.b),
CallableType(
arg_types=[self.fx.anyt, self.fx.anyt],
arg_kinds=[ARG_STAR, ARG_STAR2],
arg_names=[None, None],
ret_type=self.fx.anyt,
fallback=self.fx.function,
),
)
def test_erase_with_type_object(self) -> None:
self.assert_erase(
self.fx.callable_type(self.fx.a, self.fx.b),
CallableType(
arg_types=[self.fx.anyt, self.fx.anyt],
arg_kinds=[ARG_STAR, ARG_STAR2],
arg_names=[None, None],
ret_type=self.fx.anyt,
fallback=self.fx.type_type,
),
)
def test_erase_with_type_type(self) -> None:
self.assert_erase(self.fx.type_a, self.fx.type_a)
self.assert_erase(self.fx.type_t, self.fx.type_any)
def assert_erase(self, orig: Type, result: Type) -> None:
assert_equal(str(erase_type(orig)), str(result))
# is_more_precise
def test_is_more_precise(self) -> None:
fx = self.fx
assert is_more_precise(fx.b, fx.a)
assert is_more_precise(fx.b, fx.b)
assert is_more_precise(fx.b, fx.b)
assert is_more_precise(fx.b, fx.anyt)
assert is_more_precise(self.tuple(fx.b, fx.a), self.tuple(fx.b, fx.a))
assert is_more_precise(self.tuple(fx.b, fx.b), self.tuple(fx.b, fx.a))
assert not is_more_precise(fx.a, fx.b)
assert not is_more_precise(fx.anyt, fx.b)
# is_proper_subtype
def test_is_proper_subtype(self) -> None:
fx = self.fx
assert is_proper_subtype(fx.a, fx.a)
assert is_proper_subtype(fx.b, fx.a)
assert is_proper_subtype(fx.b, fx.o)
assert is_proper_subtype(fx.b, fx.o)
assert not is_proper_subtype(fx.a, fx.b)
assert not is_proper_subtype(fx.o, fx.b)
assert is_proper_subtype(fx.anyt, fx.anyt)
assert not is_proper_subtype(fx.a, fx.anyt)
assert not is_proper_subtype(fx.anyt, fx.a)
assert is_proper_subtype(fx.ga, fx.ga)
assert is_proper_subtype(fx.gdyn, fx.gdyn)
assert not is_proper_subtype(fx.ga, fx.gdyn)
assert not is_proper_subtype(fx.gdyn, fx.ga)
assert is_proper_subtype(fx.t, fx.t)
assert not is_proper_subtype(fx.t, fx.s)
assert is_proper_subtype(fx.a, UnionType([fx.a, fx.b]))
assert is_proper_subtype(UnionType([fx.a, fx.b]), UnionType([fx.a, fx.b, fx.c]))
assert not is_proper_subtype(UnionType([fx.a, fx.b]), UnionType([fx.b, fx.c]))
def test_is_proper_subtype_covariance(self) -> None:
fx_co = self.fx_co
assert is_proper_subtype(fx_co.gsab, fx_co.gb)
assert is_proper_subtype(fx_co.gsab, fx_co.ga)
assert not is_proper_subtype(fx_co.gsaa, fx_co.gb)
assert is_proper_subtype(fx_co.gb, fx_co.ga)
assert not is_proper_subtype(fx_co.ga, fx_co.gb)
def test_is_proper_subtype_contravariance(self) -> None:
fx_contra = self.fx_contra
assert is_proper_subtype(fx_contra.gsab, fx_contra.gb)
assert not is_proper_subtype(fx_contra.gsab, fx_contra.ga)
assert is_proper_subtype(fx_contra.gsaa, fx_contra.gb)
assert not is_proper_subtype(fx_contra.gb, fx_contra.ga)
assert is_proper_subtype(fx_contra.ga, fx_contra.gb)
def test_is_proper_subtype_invariance(self) -> None:
fx = self.fx
assert is_proper_subtype(fx.gsab, fx.gb)
assert not is_proper_subtype(fx.gsab, fx.ga)
assert not is_proper_subtype(fx.gsaa, fx.gb)
assert not is_proper_subtype(fx.gb, fx.ga)
assert not is_proper_subtype(fx.ga, fx.gb)
def test_is_proper_subtype_and_subtype_literal_types(self) -> None:
fx = self.fx
lit1 = fx.lit1
lit2 = fx.lit2
lit3 = fx.lit3
assert is_proper_subtype(lit1, fx.a)
assert not is_proper_subtype(lit1, fx.d)
assert not is_proper_subtype(fx.a, lit1)
assert is_proper_subtype(fx.uninhabited, lit1)
assert not is_proper_subtype(lit1, fx.uninhabited)
assert is_proper_subtype(lit1, lit1)
assert not is_proper_subtype(lit1, lit2)
assert not is_proper_subtype(lit2, lit3)
assert is_subtype(lit1, fx.a)
assert not is_subtype(lit1, fx.d)
assert not is_subtype(fx.a, lit1)
assert is_subtype(fx.uninhabited, lit1)
assert not is_subtype(lit1, fx.uninhabited)
assert is_subtype(lit1, lit1)
assert not is_subtype(lit1, lit2)
assert not is_subtype(lit2, lit3)
assert not is_proper_subtype(lit1, fx.anyt)
assert not is_proper_subtype(fx.anyt, lit1)
assert is_subtype(lit1, fx.anyt)
assert is_subtype(fx.anyt, lit1)
def test_subtype_aliases(self) -> None:
A1, _ = self.fx.def_alias_1(self.fx.a)
AA1, _ = self.fx.def_alias_1(self.fx.a)
assert is_subtype(A1, AA1)
assert is_subtype(AA1, A1)
A2, _ = self.fx.def_alias_2(self.fx.a)
AA2, _ = self.fx.def_alias_2(self.fx.a)
assert is_subtype(A2, AA2)
assert is_subtype(AA2, A2)
B1, _ = self.fx.def_alias_1(self.fx.b)
B2, _ = self.fx.def_alias_2(self.fx.b)
assert is_subtype(B1, A1)
assert is_subtype(B2, A2)
assert not is_subtype(A1, B1)
assert not is_subtype(A2, B2)
assert not is_subtype(A2, A1)
assert is_subtype(A1, A2)
# can_be_true / can_be_false
def test_empty_tuple_always_false(self) -> None:
tuple_type = self.tuple()
assert tuple_type.can_be_false
assert not tuple_type.can_be_true
def test_nonempty_tuple_always_true(self) -> None:
tuple_type = self.tuple(AnyType(TypeOfAny.special_form), AnyType(TypeOfAny.special_form))
assert tuple_type.can_be_true
assert not tuple_type.can_be_false
def test_union_can_be_true_if_any_true(self) -> None:
union_type = UnionType([self.fx.a, self.tuple()])
assert union_type.can_be_true
def test_union_can_not_be_true_if_none_true(self) -> None:
union_type = UnionType([self.tuple(), self.tuple()])
assert not union_type.can_be_true
def test_union_can_be_false_if_any_false(self) -> None:
union_type = UnionType([self.fx.a, self.tuple()])
assert union_type.can_be_false
def test_union_can_not_be_false_if_none_false(self) -> None:
union_type = UnionType([self.tuple(self.fx.a), self.tuple(self.fx.d)])
assert not union_type.can_be_false
# true_only / false_only
def test_true_only_of_false_type_is_uninhabited(self) -> None:
to = true_only(NoneType())
assert_type(UninhabitedType, to)
def test_true_only_of_true_type_is_idempotent(self) -> None:
always_true = self.tuple(AnyType(TypeOfAny.special_form))
to = true_only(always_true)
assert always_true is to
def test_true_only_of_instance(self) -> None:
to = true_only(self.fx.a)
assert_equal(str(to), "A")
assert to.can_be_true
assert not to.can_be_false
assert_type(Instance, to)
# The original class still can be false
assert self.fx.a.can_be_false
def test_true_only_of_union(self) -> None:
tup_type = self.tuple(AnyType(TypeOfAny.special_form))
# Union of something that is unknown, something that is always true, something
# that is always false
union_type = UnionType([self.fx.a, tup_type, self.tuple()])
to = true_only(union_type)
assert isinstance(to, UnionType)
assert_equal(len(to.items), 2)
assert to.items[0].can_be_true
assert not to.items[0].can_be_false
assert to.items[1] is tup_type
def test_false_only_of_true_type_is_uninhabited(self) -> None:
with state.strict_optional_set(True):
fo = false_only(self.tuple(AnyType(TypeOfAny.special_form)))
assert_type(UninhabitedType, fo)
def test_false_only_tuple(self) -> None:
with state.strict_optional_set(False):
fo = false_only(self.tuple(self.fx.a))
assert_equal(fo, NoneType())
with state.strict_optional_set(True):
fo = false_only(self.tuple(self.fx.a))
assert_equal(fo, UninhabitedType())
def test_false_only_of_false_type_is_idempotent(self) -> None:
always_false = NoneType()
fo = false_only(always_false)
assert always_false is fo
def test_false_only_of_instance(self) -> None:
fo = false_only(self.fx.a)
assert_equal(str(fo), "A")
assert not fo.can_be_true
assert fo.can_be_false
assert_type(Instance, fo)
# The original class still can be true
assert self.fx.a.can_be_true
def test_false_only_of_union(self) -> None:
with state.strict_optional_set(True):
tup_type = self.tuple()
# Union of something that is unknown, something that is always true, something
# that is always false
union_type = UnionType(
[self.fx.a, self.tuple(AnyType(TypeOfAny.special_form)), tup_type]
)
assert_equal(len(union_type.items), 3)
fo = false_only(union_type)
assert isinstance(fo, UnionType)
assert_equal(len(fo.items), 2)
assert not fo.items[0].can_be_true
assert fo.items[0].can_be_false
assert fo.items[1] is tup_type
def test_simplified_union(self) -> None:
fx = self.fx
self.assert_simplified_union([fx.a, fx.a], fx.a)
self.assert_simplified_union([fx.a, fx.b], fx.a)
self.assert_simplified_union([fx.a, fx.d], UnionType([fx.a, fx.d]))
self.assert_simplified_union([fx.a, fx.uninhabited], fx.a)
self.assert_simplified_union([fx.ga, fx.gs2a], fx.ga)
self.assert_simplified_union([fx.ga, fx.gsab], UnionType([fx.ga, fx.gsab]))
self.assert_simplified_union([fx.ga, fx.gsba], fx.ga)
self.assert_simplified_union([fx.a, UnionType([fx.d])], UnionType([fx.a, fx.d]))
self.assert_simplified_union([fx.a, UnionType([fx.a])], fx.a)
self.assert_simplified_union(
[fx.b, UnionType([fx.c, UnionType([fx.d])])], UnionType([fx.b, fx.c, fx.d])
)
def test_simplified_union_with_literals(self) -> None:
fx = self.fx
self.assert_simplified_union([fx.lit1, fx.a], fx.a)
self.assert_simplified_union([fx.lit1, fx.lit2, fx.a], fx.a)
self.assert_simplified_union([fx.lit1, fx.lit1], fx.lit1)
self.assert_simplified_union([fx.lit1, fx.lit2], UnionType([fx.lit1, fx.lit2]))
self.assert_simplified_union([fx.lit1, fx.lit3], UnionType([fx.lit1, fx.lit3]))
self.assert_simplified_union([fx.lit1, fx.uninhabited], fx.lit1)
self.assert_simplified_union([fx.lit1_inst, fx.a], fx.a)
self.assert_simplified_union([fx.lit1_inst, fx.lit1_inst], fx.lit1_inst)
self.assert_simplified_union(
[fx.lit1_inst, fx.lit2_inst], UnionType([fx.lit1_inst, fx.lit2_inst])
)
self.assert_simplified_union(
[fx.lit1_inst, fx.lit3_inst], UnionType([fx.lit1_inst, fx.lit3_inst])
)
self.assert_simplified_union([fx.lit1_inst, fx.uninhabited], fx.lit1_inst)
self.assert_simplified_union([fx.lit1, fx.lit1_inst], fx.lit1)
self.assert_simplified_union([fx.lit1, fx.lit2_inst], UnionType([fx.lit1, fx.lit2_inst]))
self.assert_simplified_union([fx.lit1, fx.lit3_inst], UnionType([fx.lit1, fx.lit3_inst]))
def test_simplified_union_with_str_literals(self) -> None:
fx = self.fx
self.assert_simplified_union([fx.lit_str1, fx.lit_str2, fx.str_type], fx.str_type)
self.assert_simplified_union([fx.lit_str1, fx.lit_str1, fx.lit_str1], fx.lit_str1)
self.assert_simplified_union(
[fx.lit_str1, fx.lit_str2, fx.lit_str3],
UnionType([fx.lit_str1, fx.lit_str2, fx.lit_str3]),
)
self.assert_simplified_union(
[fx.lit_str1, fx.lit_str2, fx.uninhabited], UnionType([fx.lit_str1, fx.lit_str2])
)
def test_simplify_very_large_union(self) -> None:
fx = self.fx
literals = []
for i in range(5000):
literals.append(LiteralType("v%d" % i, fx.str_type))
# This shouldn't be very slow, even if the union is big.
self.assert_simplified_union([*literals, fx.str_type], fx.str_type)
def test_simplified_union_with_str_instance_literals(self) -> None:
fx = self.fx
self.assert_simplified_union(
[fx.lit_str1_inst, fx.lit_str2_inst, fx.str_type], fx.str_type
)
self.assert_simplified_union(
[fx.lit_str1_inst, fx.lit_str1_inst, fx.lit_str1_inst], fx.lit_str1_inst
)
self.assert_simplified_union(
[fx.lit_str1_inst, fx.lit_str2_inst, fx.lit_str3_inst],
UnionType([fx.lit_str1_inst, fx.lit_str2_inst, fx.lit_str3_inst]),
)
self.assert_simplified_union(
[fx.lit_str1_inst, fx.lit_str2_inst, fx.uninhabited],
UnionType([fx.lit_str1_inst, fx.lit_str2_inst]),
)
def test_simplified_union_with_mixed_str_literals(self) -> None:
fx = self.fx
self.assert_simplified_union(
[fx.lit_str1, fx.lit_str2, fx.lit_str3_inst],
UnionType([fx.lit_str1, fx.lit_str2, fx.lit_str3_inst]),
)
self.assert_simplified_union([fx.lit_str1, fx.lit_str1, fx.lit_str1_inst], fx.lit_str1)
def assert_simplified_union(self, original: list[Type], union: Type) -> None:
assert_equal(make_simplified_union(original), union)
assert_equal(make_simplified_union(list(reversed(original))), union)
# Helpers
def tuple(self, *a: Type) -> TupleType:
return TupleType(list(a), self.fx.std_tuple)
def callable(self, vars: list[str], *a: Type) -> CallableType:
"""callable(args, a1, ..., an, r) constructs a callable with
argument types a1, ... an and return type r and type arguments
vars.
"""
tv: list[TypeVarType] = []
n = -1
for v in vars:
tv.append(TypeVarType(v, v, n, [], self.fx.o))
n -= 1
return CallableType(
list(a[:-1]),
[ARG_POS] * (len(a) - 1),
[None] * (len(a) - 1),
a[-1],
self.fx.function,
name=None,
variables=tv,
)
class JoinSuite(Suite):
def setUp(self) -> None:
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
def test_trivial_cases(self) -> None:
for simple in self.fx.a, self.fx.o, self.fx.b:
self.assert_join(simple, simple, simple)
def test_class_subtyping(self) -> None:
self.assert_join(self.fx.a, self.fx.o, self.fx.o)
self.assert_join(self.fx.b, self.fx.o, self.fx.o)
self.assert_join(self.fx.a, self.fx.d, self.fx.o)
self.assert_join(self.fx.b, self.fx.c, self.fx.a)
self.assert_join(self.fx.b, self.fx.d, self.fx.o)
def test_tuples(self) -> None:
self.assert_join(self.tuple(), self.tuple(), self.tuple())
self.assert_join(self.tuple(self.fx.a), self.tuple(self.fx.a), self.tuple(self.fx.a))
self.assert_join(
self.tuple(self.fx.b, self.fx.c),
self.tuple(self.fx.a, self.fx.d),
self.tuple(self.fx.a, self.fx.o),
)
self.assert_join(
self.tuple(self.fx.a, self.fx.a), self.fx.std_tuple, self.var_tuple(self.fx.anyt)
)
self.assert_join(
self.tuple(self.fx.a), self.tuple(self.fx.a, self.fx.a), self.var_tuple(self.fx.a)
)
self.assert_join(
self.tuple(self.fx.b), self.tuple(self.fx.a, self.fx.c), self.var_tuple(self.fx.a)
)
self.assert_join(self.tuple(), self.tuple(self.fx.a), self.var_tuple(self.fx.a))
def test_var_tuples(self) -> None:
self.assert_join(
self.tuple(self.fx.a), self.var_tuple(self.fx.a), self.var_tuple(self.fx.a)
)
self.assert_join(
self.var_tuple(self.fx.a), self.tuple(self.fx.a), self.var_tuple(self.fx.a)
)
self.assert_join(self.var_tuple(self.fx.a), self.tuple(), self.var_tuple(self.fx.a))
def test_function_types(self) -> None:
self.assert_join(
self.callable(self.fx.a, self.fx.b),
self.callable(self.fx.a, self.fx.b),
self.callable(self.fx.a, self.fx.b),
)
self.assert_join(
self.callable(self.fx.a, self.fx.b),
self.callable(self.fx.b, self.fx.b),
self.callable(self.fx.b, self.fx.b),
)
self.assert_join(
self.callable(self.fx.a, self.fx.b),
self.callable(self.fx.a, self.fx.a),
self.callable(self.fx.a, self.fx.a),
)
self.assert_join(self.callable(self.fx.a, self.fx.b), self.fx.function, self.fx.function)
self.assert_join(
self.callable(self.fx.a, self.fx.b),
self.callable(self.fx.d, self.fx.b),
self.fx.function,
)
def test_type_vars(self) -> None:
self.assert_join(self.fx.t, self.fx.t, self.fx.t)
self.assert_join(self.fx.s, self.fx.s, self.fx.s)
self.assert_join(self.fx.t, self.fx.s, self.fx.o)
def test_none(self) -> None:
# Any type t joined with None results in t.
for t in [
NoneType(),
self.fx.a,
self.fx.o,
UnboundType("x"),
self.fx.t,
self.tuple(),
self.callable(self.fx.a, self.fx.b),
self.fx.anyt,
]:
self.assert_join(t, NoneType(), t)
def test_unbound_type(self) -> None:
self.assert_join(UnboundType("x"), UnboundType("x"), self.fx.anyt)
self.assert_join(UnboundType("x"), UnboundType("y"), self.fx.anyt)
# Any type t joined with an unbound type results in dynamic. Unbound
# type means that there is an error somewhere in the program, so this
# does not affect type safety (whatever the result).
for t in [
self.fx.a,
self.fx.o,
self.fx.ga,
self.fx.t,
self.tuple(),
self.callable(self.fx.a, self.fx.b),
]:
self.assert_join(t, UnboundType("X"), self.fx.anyt)
def test_any_type(self) -> None:
# Join against 'Any' type always results in 'Any'.
for t in [
self.fx.anyt,
self.fx.a,
self.fx.o,
NoneType(),
UnboundType("x"),
self.fx.t,
self.tuple(),
self.callable(self.fx.a, self.fx.b),
]:
self.assert_join(t, self.fx.anyt, self.fx.anyt)
def test_mixed_truth_restricted_type_simple(self) -> None:
# join_simple against differently restricted truthiness types drops restrictions.
true_a = true_only(self.fx.a)
false_o = false_only(self.fx.o)
j = join_simple(self.fx.o, true_a, false_o)
assert j.can_be_true
assert j.can_be_false
def test_mixed_truth_restricted_type(self) -> None:
# join_types against differently restricted truthiness types drops restrictions.
true_any = true_only(AnyType(TypeOfAny.special_form))
false_o = false_only(self.fx.o)
j = join_types(true_any, false_o)
assert j.can_be_true
assert j.can_be_false
def test_other_mixed_types(self) -> None:
# In general, joining unrelated types produces object.
for t1 in [self.fx.a, self.fx.t, self.tuple(), self.callable(self.fx.a, self.fx.b)]:
for t2 in [self.fx.a, self.fx.t, self.tuple(), self.callable(self.fx.a, self.fx.b)]:
if str(t1) != str(t2):
self.assert_join(t1, t2, self.fx.o)
def test_simple_generics(self) -> None:
self.assert_join(self.fx.ga, self.fx.nonet, self.fx.ga)
self.assert_join(self.fx.ga, self.fx.anyt, self.fx.anyt)
for t in [
self.fx.a,
self.fx.o,
self.fx.t,
self.tuple(),
self.callable(self.fx.a, self.fx.b),
]:
self.assert_join(t, self.fx.ga, self.fx.o)
def test_generics_invariant(self) -> None:
self.assert_join(self.fx.ga, self.fx.ga, self.fx.ga)
self.assert_join(self.fx.ga, self.fx.gb, self.fx.o)
self.assert_join(self.fx.ga, self.fx.gd, self.fx.o)
self.assert_join(self.fx.ga, self.fx.g2a, self.fx.o)
def test_generics_covariant(self) -> None:
self.assert_join(self.fx_co.ga, self.fx_co.ga, self.fx_co.ga)
self.assert_join(self.fx_co.ga, self.fx_co.gb, self.fx_co.ga)
self.assert_join(self.fx_co.ga, self.fx_co.gd, self.fx_co.go)
self.assert_join(self.fx_co.ga, self.fx_co.g2a, self.fx_co.o)
def test_generics_contravariant(self) -> None:
self.assert_join(self.fx_contra.ga, self.fx_contra.ga, self.fx_contra.ga)
# TODO: this can be more precise than "object", see a comment in mypy/join.py
self.assert_join(self.fx_contra.ga, self.fx_contra.gb, self.fx_contra.o)
self.assert_join(self.fx_contra.ga, self.fx_contra.g2a, self.fx_contra.o)
def test_generics_with_multiple_args(self) -> None:
self.assert_join(self.fx_co.hab, self.fx_co.hab, self.fx_co.hab)
self.assert_join(self.fx_co.hab, self.fx_co.hbb, self.fx_co.hab)
self.assert_join(self.fx_co.had, self.fx_co.haa, self.fx_co.hao)
def test_generics_with_inheritance(self) -> None:
self.assert_join(self.fx_co.gsab, self.fx_co.gb, self.fx_co.gb)
self.assert_join(self.fx_co.gsba, self.fx_co.gb, self.fx_co.ga)
self.assert_join(self.fx_co.gsab, self.fx_co.gd, self.fx_co.go)
def test_generics_with_inheritance_and_shared_supertype(self) -> None:
self.assert_join(self.fx_co.gsba, self.fx_co.gs2a, self.fx_co.ga)
self.assert_join(self.fx_co.gsab, self.fx_co.gs2a, self.fx_co.ga)
self.assert_join(self.fx_co.gsab, self.fx_co.gs2d, self.fx_co.go)
def test_generic_types_and_any(self) -> None:
self.assert_join(self.fx.gdyn, self.fx.ga, self.fx.gdyn)
self.assert_join(self.fx_co.gdyn, self.fx_co.ga, self.fx_co.gdyn)
self.assert_join(self.fx_contra.gdyn, self.fx_contra.ga, self.fx_contra.gdyn)
def test_callables_with_any(self) -> None:
self.assert_join(
self.callable(self.fx.a, self.fx.a, self.fx.anyt, self.fx.a),
self.callable(self.fx.a, self.fx.anyt, self.fx.a, self.fx.anyt),
self.callable(self.fx.a, self.fx.anyt, self.fx.anyt, self.fx.anyt),
)
def test_overloaded(self) -> None:
c = self.callable
def ov(*items: CallableType) -> Overloaded:
return Overloaded(list(items))
fx = self.fx
func = fx.function
c1 = c(fx.a, fx.a)
c2 = c(fx.b, fx.b)
c3 = c(fx.c, fx.c)
self.assert_join(ov(c1, c2), c1, c1)
self.assert_join(ov(c1, c2), c2, c2)
self.assert_join(ov(c1, c2), ov(c1, c2), ov(c1, c2))
self.assert_join(ov(c1, c2), ov(c1, c3), c1)
self.assert_join(ov(c2, c1), ov(c3, c1), c1)
self.assert_join(ov(c1, c2), c3, func)
def test_overloaded_with_any(self) -> None:
c = self.callable
def ov(*items: CallableType) -> Overloaded:
return Overloaded(list(items))
fx = self.fx
any = fx.anyt
self.assert_join(ov(c(fx.a, fx.a), c(fx.b, fx.b)), c(any, fx.b), c(any, fx.b))
self.assert_join(ov(c(fx.a, fx.a), c(any, fx.b)), c(fx.b, fx.b), c(any, fx.b))
@skip
def test_join_interface_types(self) -> None:
self.assert_join(self.fx.f, self.fx.f, self.fx.f)
self.assert_join(self.fx.f, self.fx.f2, self.fx.o)
self.assert_join(self.fx.f, self.fx.f3, self.fx.f)
@skip
def test_join_interface_and_class_types(self) -> None:
self.assert_join(self.fx.o, self.fx.f, self.fx.o)
self.assert_join(self.fx.a, self.fx.f, self.fx.o)
self.assert_join(self.fx.e, self.fx.f, self.fx.f)
@skip
def test_join_class_types_with_interface_result(self) -> None:
# Unique result
self.assert_join(self.fx.e, self.fx.e2, self.fx.f)
# Ambiguous result
self.assert_join(self.fx.e2, self.fx.e3, self.fx.anyt)
@skip
def test_generic_interfaces(self) -> None:
fx = InterfaceTypeFixture()
self.assert_join(fx.gfa, fx.gfa, fx.gfa)
self.assert_join(fx.gfa, fx.gfb, fx.o)
self.assert_join(fx.m1, fx.gfa, fx.gfa)
self.assert_join(fx.m1, fx.gfb, fx.o)
def test_simple_type_objects(self) -> None:
t1 = self.type_callable(self.fx.a, self.fx.a)
t2 = self.type_callable(self.fx.b, self.fx.b)
tr = self.type_callable(self.fx.b, self.fx.a)
self.assert_join(t1, t1, t1)
j = join_types(t1, t1)
assert isinstance(j, CallableType)
assert j.is_type_obj()
self.assert_join(t1, t2, tr)
self.assert_join(t1, self.fx.type_type, self.fx.type_type)
self.assert_join(self.fx.type_type, self.fx.type_type, self.fx.type_type)
def test_type_type(self) -> None:
self.assert_join(self.fx.type_a, self.fx.type_b, self.fx.type_a)
self.assert_join(self.fx.type_b, self.fx.type_any, self.fx.type_any)
self.assert_join(self.fx.type_b, self.fx.type_type, self.fx.type_type)
self.assert_join(self.fx.type_b, self.fx.type_c, self.fx.type_a)
self.assert_join(self.fx.type_c, self.fx.type_d, TypeType.make_normalized(self.fx.o))
self.assert_join(self.fx.type_type, self.fx.type_any, self.fx.type_type)
self.assert_join(self.fx.type_b, self.fx.anyt, self.fx.anyt)
def test_literal_type(self) -> None:
a = self.fx.a
d = self.fx.d
lit1 = self.fx.lit1
lit2 = self.fx.lit2
lit3 = self.fx.lit3
self.assert_join(lit1, lit1, lit1)
self.assert_join(lit1, a, a)
self.assert_join(lit1, d, self.fx.o)
self.assert_join(lit1, lit2, a)
self.assert_join(lit1, lit3, self.fx.o)
self.assert_join(lit1, self.fx.anyt, self.fx.anyt)
self.assert_join(UnionType([lit1, lit2]), lit2, UnionType([lit1, lit2]))
self.assert_join(UnionType([lit1, lit2]), a, a)
self.assert_join(UnionType([lit1, lit3]), a, UnionType([a, lit3]))
self.assert_join(UnionType([d, lit3]), lit3, d)
self.assert_join(UnionType([d, lit3]), d, UnionType([d, lit3]))
self.assert_join(UnionType([a, lit1]), lit1, a)
self.assert_join(UnionType([a, lit1]), lit2, a)
self.assert_join(UnionType([lit1, lit2]), UnionType([lit1, lit2]), UnionType([lit1, lit2]))
# The order in which we try joining two unions influences the
# ordering of the items in the final produced unions. So, we
# manually call 'assert_simple_join' and tune the output
# after swapping the arguments here.
self.assert_simple_join(
UnionType([lit1, lit2]), UnionType([lit2, lit3]), UnionType([lit1, lit2, lit3])
)
self.assert_simple_join(
UnionType([lit2, lit3]), UnionType([lit1, lit2]), UnionType([lit2, lit3, lit1])
)
# There are additional test cases in check-inference.test.
# TODO: Function types + varargs and default args.
def assert_join(self, s: Type, t: Type, join: Type) -> None:
self.assert_simple_join(s, t, join)
self.assert_simple_join(t, s, join)
def assert_simple_join(self, s: Type, t: Type, join: Type) -> None:
result = join_types(s, t)
actual = str(result)
expected = str(join)
assert_equal(actual, expected, f"join({s}, {t}) == {{}} ({{}} expected)")
assert is_subtype(s, result), f"{s} not subtype of {result}"
assert is_subtype(t, result), f"{t} not subtype of {result}"
def tuple(self, *a: Type) -> TupleType:
return TupleType(list(a), self.fx.std_tuple)
def var_tuple(self, t: Type) -> Instance:
"""Construct a variable-length tuple type"""
return Instance(self.fx.std_tuplei, [t])
def callable(self, *a: Type) -> CallableType:
"""callable(a1, ..., an, r) constructs a callable with argument types
a1, ... an and return type r.
"""
n = len(a) - 1
return CallableType(list(a[:-1]), [ARG_POS] * n, [None] * n, a[-1], self.fx.function)
def type_callable(self, *a: Type) -> CallableType:
"""type_callable(a1, ..., an, r) constructs a callable with
argument types a1, ... an and return type r, and which
represents a type.
"""
n = len(a) - 1
return CallableType(list(a[:-1]), [ARG_POS] * n, [None] * n, a[-1], self.fx.type_type)