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1# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#     http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14# ==============================================================================
15
16"""Import router for absl.flags. See https://github.com/abseil/abseil-py."""
17from __future__ import absolute_import
18from __future__ import division
19from __future__ import print_function
20
21import logging as _logging
22import sys as _sys
23
24# go/tf-wildcard-import
25
26from absl.flags import *  # pylint: disable=wildcard-import
27import six as _six
28
29from tensorflow.python.util import tf_decorator
30
31
32# Since we wrap absl.flags DEFINE functions, we need to declare this module
33# does not affect key flags.
34disclaim_key_flags()  # pylint: disable=undefined-variable
35
36
37_RENAMED_ARGUMENTS = {
38    'flag_name': 'name',
39    'default_value': 'default',
40    'docstring': 'help',
41}
42
43
44def _wrap_define_function(original_function):
45  """Wraps absl.flags's define functions so tf.flags accepts old names."""
46
47  def wrapper(*args, **kwargs):
48    """Wrapper function that turns old keyword names to new ones."""
49    has_old_names = False
50    for old_name, new_name in _six.iteritems(_RENAMED_ARGUMENTS):
51      if old_name in kwargs:
52        has_old_names = True
53        value = kwargs.pop(old_name)
54        kwargs[new_name] = value
55    if has_old_names:
56      _logging.warning(
57          'Use of the keyword argument names (flag_name, default_value, '
58          'docstring) is deprecated, please use (name, default, help) instead.')
59    return original_function(*args, **kwargs)
60
61  return tf_decorator.make_decorator(original_function, wrapper)
62
63
64class _FlagValuesWrapper(object):
65  """Wrapper class for absl.flags.FLAGS.
66
67  The difference is that tf.flags.FLAGS implicitly parses flags with sys.argv
68  when accessing the FLAGS values before it's explicitly parsed,
69  while absl.flags.FLAGS raises an exception.
70  """
71
72  def __init__(self, flags_object):
73    self.__dict__['__wrapped'] = flags_object
74
75  def __getattribute__(self, name):
76    if name == '__dict__':
77      return super(_FlagValuesWrapper, self).__getattribute__(name)
78    return self.__dict__['__wrapped'].__getattribute__(name)
79
80  def __getattr__(self, name):
81    wrapped = self.__dict__['__wrapped']
82    # To maintain backwards compatibility, implicitly parse flags when reading
83    # a flag.
84    if not wrapped.is_parsed():
85      wrapped(_sys.argv)
86    return wrapped.__getattr__(name)
87
88  def __setattr__(self, name, value):
89    return self.__dict__['__wrapped'].__setattr__(name, value)
90
91  def __delattr__(self, name):
92    return self.__dict__['__wrapped'].__delattr__(name)
93
94  def __dir__(self):
95    return self.__dict__['__wrapped'].__dir__()
96
97  def __getitem__(self, name):
98    return self.__dict__['__wrapped'].__getitem__(name)
99
100  def __setitem__(self, name, flag):
101    return self.__dict__['__wrapped'].__setitem__(name, flag)
102
103  def __len__(self):
104    return self.__dict__['__wrapped'].__len__()
105
106  def __iter__(self):
107    return self.__dict__['__wrapped'].__iter__()
108
109  def __str__(self):
110    return self.__dict__['__wrapped'].__str__()
111
112  def __call__(self, *args, **kwargs):
113    return self.__dict__['__wrapped'].__call__(*args, **kwargs)
114
115
116# pylint: disable=invalid-name,used-before-assignment
117# absl.flags APIs use `default` as the name of the default value argument.
118# Allow the following functions continue to accept `default_value`.
119DEFINE_string = _wrap_define_function(DEFINE_string)
120DEFINE_boolean = _wrap_define_function(DEFINE_boolean)
121DEFINE_bool = DEFINE_boolean
122DEFINE_float = _wrap_define_function(DEFINE_float)
123DEFINE_integer = _wrap_define_function(DEFINE_integer)
124# pylint: enable=invalid-name,used-before-assignment
125
126FLAGS = _FlagValuesWrapper(FLAGS)  # pylint: disable=used-before-assignment
127