upstream/mercurial-mirror Files · mercurial/thirdparty/attr/converters.py

shelve: drop unnecessary backup of dirstate for phase-based case...

shelve: drop unnecessary backup of dirstate for phase-based case Regular shelve has a hack using an uncommitted transaction that's then aborted at the end of the operation. It preserves the dirstate across the abort, however, by saving a backup copy of it. Phase-based shelve instead commits the transaction, so the hack shouldn't be necessary there. Differential Revision: https://phab.mercurial-scm.org/D5389

Siddharth Agarwal - - Load All Authors

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      """

      Commonly useful converters.

      """

      from __future__ import absolute_import, division, print_function

      def optional(converter):

          """

          A converter that allows an attribute to be optional. An optional attribute

          is one which can be set to ``None``.

          :param callable converter: the converter that is used for non-``None``

              values.

          ..  versionadded:: 17.1.0

          """

          def optional_converter(val):

              if val is None:

                  return None

              return converter(val)

          return optional_converter

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				"""
				Commonly useful converters.
				"""

				from __future__ import absolute_import, division, print_function


				def optional(converter):
				"""
				A converter that allows an attribute to be optional. An optional attribute
				is one which can be set to ``None``.

				:param callable converter: the converter that is used for non-``None``
				values.

				.. versionadded:: 17.1.0
				"""

				def optional_converter(val):
				if val is None:
				return None
				return converter(val)

				return optional_converter