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51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
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# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
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# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER
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"""
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Astroid hook for the dataclasses library
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"""
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import astroid
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from astroid import MANAGER
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DATACLASSES_DECORATORS = frozenset(("dataclasses.dataclass", "dataclass"))
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def is_decorated_with_dataclass(node, decorator_names=DATACLASSES_DECORATORS):
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"""Return True if a decorated node has a `dataclass` decorator applied."""
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if not node.decorators:
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return False
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for decorator_attribute in node.decorators.nodes:
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if isinstance(decorator_attribute, astroid.Call): # decorator with arguments
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decorator_attribute = decorator_attribute.func
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if decorator_attribute.as_string() in decorator_names:
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return True
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return False
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def dataclass_transform(node):
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"""Rewrite a dataclass to be easily understood by pylint"""
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for assign_node in node.body:
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if not isinstance(assign_node, (astroid.AnnAssign, astroid.Assign)):
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continue
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targets = (
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assign_node.targets
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if hasattr(assign_node, "targets")
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else [assign_node.target]
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)
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for target in targets:
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rhs_node = astroid.Unknown(
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lineno=assign_node.lineno,
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col_offset=assign_node.col_offset,
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parent=assign_node,
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)
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node.instance_attrs[target.name] = [rhs_node]
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node.locals[target.name] = [rhs_node]
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MANAGER.register_transform(
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astroid.ClassDef, dataclass_transform, is_decorated_with_dataclass
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)
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