upstream/mercurial-mirror Files · mercurial/thirdparty/zope/interface/_flatten.py

rust-node: binary Node ID and conversion utilities...

rust-node: binary Node ID and conversion utilities The choice of type makes sure that a `Node` has the exact wanted size. We'll use a different type for prefixes. Added dependency: hexadecimal conversion relies on the `hex` crate. The fact that sooner or later Mercurial is going to need to change its hash sizes has been taken strongly in consideration: - the hash length is a constant, but that is not directly exposed to callers. Changing the value of that constant is the only thing to do to change the hash length (even in unit tests) - the code could be adapted to support several sizes of hashes, if that turned out to be useful. To that effect, only the size of a given `Node` is exposed in the public API. - callers not involved in initial computation, I/O and FFI are able to operate without a priori assumptions on the hash size. The traits `FromHex` and `ToHex` have not been directly implemented, so that the doc-comments explaining these restrictions would stay really visible in `cargo doc` Differential Revision: https://phab.mercurial-scm.org/D7788

Gregory Szorc - - Load All Authors

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      ##############################################################################

      #

      # Copyright (c) 2002 Zope Foundation and Contributors.

      # All Rights Reserved.

      #

      # This software is subject to the provisions of the Zope Public License,

      # Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.

      # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED

      # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

      # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS

      # FOR A PARTICULAR PURPOSE.

      #

      ##############################################################################

      """Adapter-style interface registry

      See Adapter class.

      """

      from __future__ import absolute_import

      from .interface import Declaration

      def _flatten(implements, include_None=0):

          try:

              r = implements.flattened()

          except AttributeError:

              if implements is None:

                  r=()

              else:

                  r = Declaration(implements).flattened()

          if not include_None:

              return r

          r = list(r)

          r.append(None)

          return r

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				##############################################################################
				#
				# Copyright (c) 2002 Zope Foundation and Contributors.
				# All Rights Reserved.
				#
				# This software is subject to the provisions of the Zope Public License,
				# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
				# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
				# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
				# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
				# FOR A PARTICULAR PURPOSE.
				#
				##############################################################################
				"""Adapter-style interface registry

				See Adapter class.
				"""

				from __future__ import absolute_import

				from .interface import Declaration

				def _flatten(implements, include_None=0):

				try:
				r = implements.flattened()
				except AttributeError:
				if implements is None:
				r=()
				else:
				r = Declaration(implements).flattened()

				if not include_None:
				return r

				r = list(r)
				r.append(None)
				return r