75 lines
2.1 KiB
Python
75 lines
2.1 KiB
Python
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# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""Gast compatibility library. Supports 0.2.2 and 0.3.2."""
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# TODO(mdan): Remove this file once it's safe to break compatibility.
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import functools
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import gast
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GAST2 = hasattr(gast, 'Str')
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GAST3 = not GAST2
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def _is_constant_gast_2(node):
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return isinstance(node, (gast.Num, gast.Str, gast.Bytes, gast.Ellipsis,
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gast.NameConstant))
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def _is_constant_gast_3(node):
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return isinstance(node, gast.Constant)
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def is_literal(node):
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"""Tests whether node represents a Python literal."""
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# Normal literals, True/False/None/Etc. in Python3
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if is_constant(node):
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return True
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# True/False/None/Etc. in Python2
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if isinstance(node, gast.Name) and node.id in ['True', 'False', 'None']:
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return True
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return False
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def _is_ellipsis_gast_2(node):
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return isinstance(node, gast.Ellipsis)
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def _is_ellipsis_gast_3(node):
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return isinstance(node, gast.Constant) and node.value == Ellipsis
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if GAST2:
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is_constant = _is_constant_gast_2
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is_ellipsis = _is_ellipsis_gast_2
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Module = gast.Module
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Name = gast.Name
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Str = gast.Str
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elif GAST3:
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is_constant = _is_constant_gast_3
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is_ellipsis = _is_ellipsis_gast_3
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Module = functools.partial(gast.Module, type_ignores=None) # pylint:disable=invalid-name
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Name = functools.partial(gast.Name, type_comment=None) # pylint:disable=invalid-name
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Str = functools.partial(gast.Constant, kind=None) # pylint:disable=invalid-name
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else:
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assert False
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