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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/master/COPYING.LESSER
"""
Astroid hook for the attrs library
Without this hook pylint reports unsupported-assignment-operation
for attrs classes
"""
import astroid
from astroid import MANAGER
ATTRIB_NAMES = frozenset(("attr.ib", "attrib", "attr.attrib"))
ATTRS_NAMES = frozenset(("attr.s", "attrs", "attr.attrs", "attr.attributes"))
def is_decorated_with_attrs(node, decorator_names=ATTRS_NAMES):
"""Return True if a decorated node has
an attr decorator applied."""
if not node.decorators:
return False
for decorator_attribute in node.decorators.nodes:
if isinstance(decorator_attribute, astroid.Call): # decorator with arguments
decorator_attribute = decorator_attribute.func
if decorator_attribute.as_string() in decorator_names:
return True
return False
def attr_attributes_transform(node):
"""Given that the ClassNode has an attr decorator,
rewrite class attributes as instance attributes
"""
# Astroid can't infer this attribute properly
# Prevents https://github.com/PyCQA/pylint/issues/1884
node.locals["__attrs_attrs__"] = [astroid.Unknown(parent=node)]
for cdefbodynode in node.body:
if not isinstance(cdefbodynode, astroid.Assign):
continue
if isinstance(cdefbodynode.value, astroid.Call):
if cdefbodynode.value.func.as_string() not in ATTRIB_NAMES:
continue
else:
continue
for target in cdefbodynode.targets:
rhs_node = astroid.Unknown(
lineno=cdefbodynode.lineno,
col_offset=cdefbodynode.col_offset,
parent=cdefbodynode,
)
node.locals[target.name] = [rhs_node]
MANAGER.register_transform(
astroid.ClassDef, attr_attributes_transform, is_decorated_with_attrs
)