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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Enhancements to Python's ``argparse`` module.
+"""
+
+from __future__ import absolute_import # so we can import standard 'argparse'
+
+from argparse import ArgumentParser as BaseArgumentParser
+
+
+class ArgumentParser(BaseArgumentParser):
+ """
+ Enhanced argument parser.
+
+ Applied patch to fix `this issue <https://bugs.python.org/issue22433>`__.
+ """
+
+ def add_flag_argument(self, name, help_true=None, help_false=None, default=False):
+ """
+ Adds a flag argument as two arguments: ``--my-flag`` and ``--no-my-flag``.
+ """
+
+ dest = name.replace('-', '_')
+
+ if default:
+ if help_true is not None:
+ help_true += ' (default)'
+ else:
+ help_true = '(default)'
+ else:
+ if help_false is not None:
+ help_false += ' (default)'
+ else:
+ help_false = '(default)'
+
+ group = self.add_mutually_exclusive_group()
+ group.add_argument('--%s' % name, action='store_true', help=help_true)
+ group.add_argument('--no-%s' % name, dest=dest, action='store_false', help=help_false)
+
+ self.set_defaults(**{dest: default})
+
+ def _parse_optional(self, arg_string):
+
+ if self._is_positional(arg_string):
+ return None
+
+ # if the option string is present in the parser, return the action
+ if arg_string in self._option_string_actions:
+ action = self._option_string_actions[arg_string]
+ return action, arg_string, None
+
+ # if the option string before the "=" is present, return the action
+ if '=' in arg_string:
+ option_string, explicit_arg = arg_string.split('=', 1)
+ if option_string in self._option_string_actions:
+ action = self._option_string_actions[option_string]
+ return action, option_string, explicit_arg
+
+ # search through all possible prefixes of the option string
+ # and all actions in the parser for possible interpretations
+ option_tuples = self._get_option_tuples(arg_string)
+
+ # if multiple actions match, the option string was ambiguous
+ if len(option_tuples) > 1:
+ options = ', '.join(
+ [option_string for action, option_string, explicit_arg in option_tuples])
+ tup = arg_string, options
+ self.error('ambiguous option: %s could match %s' % tup)
+
+ # if exactly one action matched, this segmentation is good,
+ # so return the parsed action
+ elif len(option_tuples) == 1:
+ option_tuple = option_tuples
+ return option_tuple
+
+ # if it was not found as an option, but it looks like a negative
+ # number, it was meant to be positional
+ # unless there are negative-number-like options
+ if self._negative_number_matcher.match(arg_string):
+ if not self._has_negative_number_optionals:
+ return None
+
+ # it was meant to be an optional but there is no such option
+ # in this parser (though it might be a valid option in a subparser)
+ return None, arg_string, None
+
+ def _is_positional(self, arg_string):
+ # if it's an empty string, it was meant to be a positional
+ if not arg_string:
+ return True
+
+ # if it doesn't start with a prefix, it was meant to be positional
+ if not arg_string[0] in self.prefix_chars:
+ return True
+
+ # if it's just a single character, it was meant to be positional
+ if len(arg_string) == 1:
+ return True
+
+ # if it contains a space, it was meant to be a positional
+ if ' ' in arg_string and arg_string[0] not in self.prefix_chars:
+ return True
+
+ return False