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46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
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# Copyright (c) 2016, 2018 Claudiu Popa <pcmanticore@gmail.com>
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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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"""Astroid brain hints for some of the _io C objects."""
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import astroid
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BUFFERED = {"BufferedWriter", "BufferedReader"}
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TextIOWrapper = "TextIOWrapper"
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FileIO = "FileIO"
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BufferedWriter = "BufferedWriter"
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def _generic_io_transform(node, name, cls):
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"""Transform the given name, by adding the given *class* as a member of the node."""
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io_module = astroid.MANAGER.ast_from_module_name("_io")
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attribute_object = io_module[cls]
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instance = attribute_object.instantiate_class()
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node.locals[name] = [instance]
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def _transform_text_io_wrapper(node):
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# This is not always correct, since it can vary with the type of the descriptor,
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# being stdout, stderr or stdin. But we cannot get access to the name of the
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# stream, which is why we are using the BufferedWriter class as a default
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# value
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return _generic_io_transform(node, name="buffer", cls=BufferedWriter)
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def _transform_buffered(node):
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return _generic_io_transform(node, name="raw", cls=FileIO)
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astroid.MANAGER.register_transform(
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astroid.ClassDef, _transform_buffered, lambda node: node.name in BUFFERED
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)
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astroid.MANAGER.register_transform(
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astroid.ClassDef,
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_transform_text_io_wrapper,
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lambda node: node.name == TextIOWrapper,
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)
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