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# from __future__ import annotations # breaks msgspec Annotated
from typing import ClassVar
from unittest.mock import Mock
import pytest
from psygnal import (
Signal,
SignalGroup,
SignalGroupDescriptor,
)
@pytest.mark.parametrize(
"type_",
[
"dataclass",
"attrs",
"pydantic",
"msgspec",
],
)
def test_alias_parameters(type_: str) -> None:
root_aliases = {"b": None, "bb": None}
class MyGroup(SignalGroup, signal_aliases=root_aliases):
b = Signal(str, str)
bb = Signal(str, str)
foo_options = {"signal_aliases": {"_b": None}}
bar_options = {
"signal_aliases": lambda x: None if x.startswith("_") else f"{x}_changed"
}
baz_options = {"signal_aliases": {"a": "a_changed", "_b": "b_changed"}}
baz2_options = {
"signal_group_class": MyGroup,
"signal_aliases": {"aa": "a", "bb": "b"},
}
if type_ == "dataclass":
from dataclasses import dataclass, field
@dataclass
class Foo:
events: ClassVar = SignalGroupDescriptor(**foo_options)
a: int
_b: str
@dataclass
class Bar:
events: ClassVar = SignalGroupDescriptor(**bar_options)
a: int
_b: str
@dataclass
class Baz:
events: ClassVar = SignalGroupDescriptor(**baz_options)
a: int
_b: str = field(default="b")
@property
def b(self) -> str:
return self._b
@b.setter
def b(self, value: str):
self._b = value
@dataclass
class Baz2:
events: ClassVar = SignalGroupDescriptor(**baz2_options)
a: int
aa: int
b: str
bb: str
elif type_ == "attrs":
from attrs import define, field
@define
class Foo:
events: ClassVar = SignalGroupDescriptor(**foo_options)
a: int
_b: str = field(alias="_b")
@define
class Bar:
events: ClassVar = SignalGroupDescriptor(**bar_options)
a: int
_b: str = field(alias="_b")
@define
class Baz:
events: ClassVar = SignalGroupDescriptor(**baz_options)
a: int
_b: str = field(alias="_b", default="b")
@property
def b(self) -> str:
return self._b
@b.setter
def b(self, value: str):
self._b = value
@define
class Baz2:
events: ClassVar = SignalGroupDescriptor(**baz2_options)
a: int
aa: int
b: str
bb: str
elif type_ == "pydantic":
pytest.importorskip("pydantic", minversion="2")
from pydantic import BaseModel
class Foo(BaseModel):
events: ClassVar = SignalGroupDescriptor(**foo_options)
a: int
_b: str # not a field anyway
class Bar(BaseModel):
events: ClassVar = SignalGroupDescriptor(**bar_options)
a: int
_b: str # not a field anyway
class Baz(BaseModel):
events: ClassVar = SignalGroupDescriptor(**baz_options)
a: int
_b: str = "b" # not defining a field, signal will not be created
@property
def b(self) -> str:
return self._b
@b.setter
def b(self, value: str):
self._b = value
class Baz2(BaseModel):
events: ClassVar = SignalGroupDescriptor(**baz2_options)
a: int
aa: int
b: str
bb: str
elif type_ == "msgspec":
msgspec = pytest.importorskip("msgspec")
class Foo(msgspec.Struct): # type: ignore
events: ClassVar = SignalGroupDescriptor(**foo_options)
a: int
_b: str
class Bar(msgspec.Struct): # type: ignore
events: ClassVar = SignalGroupDescriptor(**bar_options)
a: int
_b: str
class Baz(msgspec.Struct): # type: ignore
events: ClassVar = SignalGroupDescriptor(**baz_options)
a: int
_b: str = "b"
@property
def b(self) -> str:
return self._b
@b.setter
def b(self, value: str):
self._b = value
class Baz2(msgspec.Struct): # type: ignore
events: ClassVar = SignalGroupDescriptor(**baz2_options)
a: int
aa: int
b: str
bb: str
# Instantiate objects
foo = Foo(a=1, _b="b")
bar = Bar(a=1, _b="b")
baz = Baz(a=1)
baz2 = Baz2(a=1, aa=2, b="b", bb="bb")
# Check signals
assert set(foo.events) == {"a"}
assert hasattr(foo.events, "_psygnal_aliases")
assert foo.events._psygnal_aliases == foo_options["signal_aliases"]
assert set(bar.events) == {"a_changed"}
assert hasattr(bar.events, "_psygnal_aliases")
if type_.startswith("pydantic"):
assert bar.events._psygnal_aliases == {"a": "a_changed"}
else:
assert bar.events._psygnal_aliases == {"a": "a_changed", "_b": None}
if type_.startswith("pydantic"):
assert set(baz.events) == {"a_changed"}
else:
assert set(baz.events) == {"a_changed", "b_changed"}
assert hasattr(baz.events, "_psygnal_aliases")
assert baz.events._psygnal_aliases == baz_options["signal_aliases"]
# with pytest.warns(UserWarning, match=r"Skip signal \'a\', was already created"):
with pytest.warns(UserWarning) as record:
assert set(baz2.events) == {"a", "b", "bb"}
assert len(record) == 2
assert record[0].message.args[0].startswith("Skip signal 'a', was already created")
assert record[1].message.args[0].startswith("Skip signal 'b', was already defined")
assert hasattr(baz.events, "_psygnal_aliases")
assert baz2.events._psygnal_aliases == {
**root_aliases,
**baz2_options["signal_aliases"],
}
mock = Mock()
foo.events.a.connect(mock)
bar.events.a_changed.connect(mock)
baz.events.a_changed.connect(mock)
if not type_.startswith("pydantic"):
baz.events.b_changed.connect(mock)
baz2.events.a.connect(mock)
baz2.events.b.connect(mock)
baz2.events.bb.connect(mock)
# Foo
foo.a = 1
mock.assert_not_called()
foo.a = 2
mock.assert_called_once_with(2, 1)
mock.reset_mock()
foo._b = "b"
foo._b = "c"
mock.assert_not_called()
# Bar
bar.a = 1
mock.assert_not_called()
bar.a = 2
mock.assert_called_once_with(2, 1)
mock.reset_mock()
bar._b = "b"
bar._b = "c"
mock.assert_not_called()
# Baz
baz.a = 1
mock.assert_not_called()
baz.a = 2
mock.assert_called_once_with(2, 1)
mock.reset_mock()
# Baz2
baz2.a = 1
baz2.aa = 2
mock.assert_not_called()
baz2.a = 2
mock.assert_called_once_with(2, 1)
mock.reset_mock()
baz2.aa = 3
mock.assert_called_once_with(3, 2)
mock.reset_mock()
baz2.b = "b"
mock.assert_not_called()
baz2.b = "c"
mock.assert_not_called()
baz2.bb = "bb"
mock.assert_not_called()
baz2.bb = "bbb"
mock.assert_called_once_with("bbb", "bb")
mock.reset_mock()
# pydantic v1 does not support properties
if type_ == "pydantic_v1":
return
baz.b = "b"
mock.assert_not_called()
baz.b = "c"
if not type_.startswith("pydantic"):
mock.assert_called_once_with("c", "b")
def test_direct_signal_group() -> None:
class FooSignalGroup(SignalGroup, signal_aliases={"e": None}):
a = Signal(int, int)
b_changed = Signal(float, float)
c = Signal(str, str)
d = Signal(str, str)
e = Signal(str, str)
class Foo:
events: ClassVar = SignalGroupDescriptor(
signal_group_class=FooSignalGroup,
collect_fields=False,
signal_aliases={
"b": "b_changed",
"c": None,
"_c": "c",
"_e": "e",
},
)
a: int
b: float
_c: str
_d: str
_e: int
def __init__(
self,
a: int = 1,
b: float = 2.0,
c: str = "c",
d: str = "d",
_e: int = 5,
):
self.a = a
self.b = b
self.c = c
self.d = d
self._e = _e
@property
def c(self) -> str:
return self._c
@c.setter
def c(self, value: str):
self._c = value
@property
def d(self) -> str:
return self._d.lower()
@d.setter
def d(self, value: str):
self._d = value
foo = Foo()
assert hasattr(foo.events, "_psygnal_aliases")
assert foo.events._psygnal_aliases == {
"b": "b_changed",
"_c": "c",
"c": None,
"e": None,
"_e": "e",
}
mock = Mock()
foo.events.a.connect(mock)
foo.events.b_changed.connect(mock)
foo.events.c.connect(mock)
foo.events.d.connect(mock)
foo.events.e.connect(mock)
foo.events.e.emit("f", "e")
mock.assert_called_once_with("f", "e")
mock.reset_mock()
foo.a = 2
mock.assert_called_once_with(2, 1)
mock.reset_mock()
foo.b = 3.0
mock.assert_called_once_with(3.0, 2.0)
mock.reset_mock()
foo.c = "c"
mock.assert_not_called()
foo.c = "cc"
mock.assert_called_once_with("cc", "c")
mock.reset_mock()
foo._c = "ccc"
mock.assert_called_once_with("ccc", "cc")
mock.reset_mock()
foo.d = "D"
mock.assert_not_called()
foo.d = "DD"
mock.assert_called_once_with("dd", "d")
mock.reset_mock()
foo._e = 5
mock.assert_not_called()
foo._e = 6
mock.assert_called_once_with(6, 5)
mock.reset_mock()
def test_bad_siggroup_descriptor_init():
with pytest.raises(
TypeError,
match="'signal_group_class' must be a subclass of SignalGroup",
):
SignalGroupDescriptor(signal_group_class=type) # type: ignore
with pytest.raises(
ValueError,
match="Cannot use SignalGroup with `collect_fields=False`.",
):
SignalGroupDescriptor(collect_fields=False)
with pytest.raises(
ValueError,
match="Cannot use a Callable for `signal_aliases` with `collect_fields=False`",
):
SignalGroupDescriptor(
collect_fields=False,
signal_group_class=type("MyGroup", (SignalGroup,), {"x": Signal()}),
signal_aliases=lambda x: None,
)
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