upstream/mercurial-mirror Files · mercurial/policy.py

bdiff: adjust criteria for getting optimal longest match in the A side middle...

bdiff: adjust criteria for getting optimal longest match in the A side middle We prefer matches closer to the middle to balance recursion, as introduced in f1ca249696ed. For ranges with uneven length, matches starting exactly in the middle should have preference. That will be optimal for matches of length 1. We will thus accept equality in the half check. For ranges with even length, half was ceil'ed when calculated but we got the preference for low matches from the 'less than half' check. To get the same result as before when we also accept equality, floor it. Without that, test-annotate.t would show some different (still correct but less optimal) results. This will change the heuristics. Tests shows a slightly different output - and sometimes slightly smaller bundles. The bundle size for 4.0 (hg bundle --base null -r 4.0 x.hg) happens to go from 22804885 to 22803824 bytes - an 0.005% reduction.

Maciej Fijalkowski - - Load All Authors

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      # policy.py - module policy logic for Mercurial.

      #

      # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      from __future__ import absolute_import

      import os

      import sys

      # Rules for how modules can be loaded. Values are:

      #

      #    c - require C extensions

      #    allow - allow pure Python implementation when C loading fails

      #    cffi - required cffi versions (implemented within pure module)

      #    cffi-allow - allow pure Python implementation if cffi version is missing

      #    py - only load pure Python modules

      #

      # By default, require the C extensions for performance reasons.

      policy = 'c'

      policynoc = ('cffi', 'cffi-allow', 'py')

      policynocffi = ('c', 'py')

      try:

          from . import __modulepolicy__

          policy = __modulepolicy__.modulepolicy

      except ImportError:

          pass

      # PyPy doesn't load C extensions.

      #

      # The canonical way to do this is to test platform.python_implementation().

      # But we don't import platform and don't bloat for it here.

      if '__pypy__' in sys.builtin_module_names:

          policy = 'cffi'

      # Our C extensions aren't yet compatible with Python 3. So use pure Python

      # on Python 3 for now.

      if sys.version_info[0] >= 3:

          policy = 'py'

      # Environment variable can always force settings.

      policy = os.environ.get('HGMODULEPOLICY', policy)

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				# policy.py - module policy logic for Mercurial.
				#
				# Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				from __future__ import absolute_import

				import os
				import sys

				# Rules for how modules can be loaded. Values are:
				#
				# c - require C extensions
				# allow - allow pure Python implementation when C loading fails
				# cffi - required cffi versions (implemented within pure module)
				# cffi-allow - allow pure Python implementation if cffi version is missing
				# py - only load pure Python modules
				#
				# By default, require the C extensions for performance reasons.
				policy = 'c'
				policynoc = ('cffi', 'cffi-allow', 'py')
				policynocffi = ('c', 'py')

				try:
				from . import __modulepolicy__
				policy = __modulepolicy__.modulepolicy
				except ImportError:
				pass

				# PyPy doesn't load C extensions.
				#
				# The canonical way to do this is to test platform.python_implementation().
				# But we don't import platform and don't bloat for it here.
				if '__pypy__' in sys.builtin_module_names:
				policy = 'cffi'

				# Our C extensions aren't yet compatible with Python 3. So use pure Python
				# on Python 3 for now.
				if sys.version_info[0] >= 3:
				policy = 'py'

				# Environment variable can always force settings.
				policy = os.environ.get('HGMODULEPOLICY', policy)