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

rust: introduce `dirstate-tree` cargo feature...

rust: introduce `dirstate-tree` cargo feature This feature gates (at compile-time) the use of the newly-added dirstate tree. The motivation for this is that the dirstate tree is currently *very* slow; replacing the current hashmap-based dirstate is not a viable solution in terms of performance... and why would you be using the Rust implementation if not for performance? The feature will also help reviewers better understand the differences that will slowly appear as the dirstate tree gets better. Differential Revision: https://phab.mercurial-scm.org/D9132

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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