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# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt
"""Astroid hooks for the PyQT library."""
from astroid import nodes, parse
from astroid.brain.helpers import register_module_extender
from astroid.builder import AstroidBuilder
from astroid.manager import AstroidManager
def _looks_like_signal(
node: nodes.FunctionDef, signal_name: str = "pyqtSignal"
) -> bool:
"""Detect a Signal node."""
klasses = node.instance_attrs.get("__class__", [])
# On PySide2 or PySide6 (since Qt 5.15.2) the Signal class changed locations
if node.qname().partition(".")[0] in {"PySide2", "PySide6"}:
return any(cls.qname() == "Signal" for cls in klasses) # pragma: no cover
if klasses:
try:
return klasses[0].name == signal_name
except AttributeError: # pragma: no cover
# return False if the cls does not have a name attribute
pass
return False
def transform_pyqt_signal(node: nodes.FunctionDef) -> None:
module = parse(
"""
_UNSET = object()
class pyqtSignal(object):
def connect(self, slot, type=None, no_receiver_check=False):
pass
def disconnect(self, slot=_UNSET):
pass
def emit(self, *args):
pass
"""
)
signal_cls: nodes.ClassDef = module["pyqtSignal"]
node.instance_attrs["emit"] = [signal_cls["emit"]]
node.instance_attrs["disconnect"] = [signal_cls["disconnect"]]
node.instance_attrs["connect"] = [signal_cls["connect"]]
def transform_pyside_signal(node: nodes.FunctionDef) -> None:
module = parse(
"""
class NotPySideSignal(object):
def connect(self, receiver, type=None):
pass
def disconnect(self, receiver):
pass
def emit(self, *args):
pass
"""
)
signal_cls: nodes.ClassDef = module["NotPySideSignal"]
node.instance_attrs["connect"] = [signal_cls["connect"]]
node.instance_attrs["disconnect"] = [signal_cls["disconnect"]]
node.instance_attrs["emit"] = [signal_cls["emit"]]
def pyqt4_qtcore_transform():
return AstroidBuilder(AstroidManager()).string_build(
"""
def SIGNAL(signal_name): pass
class QObject(object):
def emit(self, signal): pass
"""
)
register_module_extender(AstroidManager(), "PyQt4.QtCore", pyqt4_qtcore_transform)
AstroidManager().register_transform(
nodes.FunctionDef, transform_pyqt_signal, _looks_like_signal
)
AstroidManager().register_transform(
nodes.ClassDef,
transform_pyside_signal,
lambda node: node.qname() in {"PySide.QtCore.Signal", "PySide2.QtCore.Signal"},
)
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