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# Copyright (c) 2016 Claudiu Popa <pcmanticore@gmail.com>
# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER
from astroid import exceptions
from astroid.interpreter import runtimeabc
from astroid.interpreter import objects
from astroid.tree import treeabc
from astroid import util
@util.singledispatch
def can_assign(node, attrname):
"""Check if the given attribute can be assigned onto the given node.
By default, everything is assignable.
"""
return True
def _settable_property(func_node, attrname):
expected_setter = "%s.setter" % (attrname, )
if not func_node.decorators:
return False
for decorator in func_node.decorators.nodes:
if decorator.as_string() == expected_setter:
return True
@can_assign.register(runtimeabc.Instance)
def _instance_can_assign(node, attrname):
try:
slots = node.slots()
except TypeError:
pass
else:
if slots and attrname not in set(slot.value for slot in slots):
return False
# Check non settable property.
try:
names = node.getattr(attrname)
except exceptions.AttributeInferenceError:
# In what circumstances can this fail?
return True
if not all(isinstance(name, treeabc.FunctionDef) for name in names):
return True
if len(names) == 1 and objects.is_property(names[0]):
# This should even emit a type checking error.
return False
elif all(objects.is_property(name) or _settable_property(name, attrname)
for name in names):
return True
return False
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