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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 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
- )
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