# 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 brain hints for some of the _io C objects.""" from astroid.manager import AstroidManager from astroid.nodes import ClassDef BUFFERED = {"BufferedWriter", "BufferedReader"} TextIOWrapper = "TextIOWrapper" FileIO = "FileIO" BufferedWriter = "BufferedWriter" def _generic_io_transform(node, name, cls): """Transform the given name, by adding the given *class* as a member of the node. """ io_module = AstroidManager().ast_from_module_name("_io") attribute_object = io_module[cls] instance = attribute_object.instantiate_class() node.locals[name] = [instance] def _transform_text_io_wrapper(node): # This is not always correct, since it can vary with the type of the descriptor, # being stdout, stderr or stdin. But we cannot get access to the name of the # stream, which is why we are using the BufferedWriter class as a default # value return _generic_io_transform(node, name="buffer", cls=BufferedWriter) def _transform_buffered(node): return _generic_io_transform(node, name="raw", cls=FileIO) AstroidManager().register_transform( ClassDef, _transform_buffered, lambda node: node.name in BUFFERED ) AstroidManager().register_transform( ClassDef, _transform_text_io_wrapper, lambda node: node.name == TextIOWrapper )