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

rbc: use struct unpack_from and pack_into instead of unpack and pack...

rbc: use struct unpack_from and pack_into instead of unpack and pack These functions were introduced in Python 2.5 and are faster and simpler than the old ones ... mainly because we can avoid intermediate buffers: $ python -m timeit -s "_rbcrecfmt='>4sI'" -s 's = "x"*10000' -s 'from struct import unpack' 'unpack(_rbcrecfmt, buffer(s, 16, 8))' 1000000 loops, best of 3: 0.543 usec per loop $ python -m timeit -s "_rbcrecfmt='>4sI'" -s 's = "x"*10000' -s 'from struct import unpack_from' 'unpack_from(_rbcrecfmt, s, 16)' 1000000 loops, best of 3: 0.323 usec per loop $ python -m timeit -s "from array import array" -s "_rbcrecfmt='>4sI'" -s "s = array('c')" -s 's.fromstring("x"*10000)' -s 'from struct import pack' -s "rec = array('c')" 'rec.fromstring(pack(_rbcrecfmt, "asdf", 7))' 1000000 loops, best of 3: 0.364 usec per loop $ python -m timeit -s "from array import array" -s "_rbcrecfmt='>4sI'" -s "s = array('c')" -s 's.fromstring("x"*10000)' -s 'from struct import pack_into' -s "rec = array('c')" -s 'rec.fromstring("x"*100)' 'pack_into(_rbcrecfmt, rec, 0, "asdf", 7)' 1000000 loops, best of 3: 0.229 usec per loop

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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 = b'c'

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

      policynocffi = (b'c', b'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 = b'py'

      # Environment variable can always force settings.

      if sys.version_info[0] >= 3:

          if 'HGMODULEPOLICY' in os.environ:

              policy = os.environ['HGMODULEPOLICY'].encode('utf-8')

      else:

          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 = b'c'
				policynoc = (b'cffi', b'cffi-allow', b'py')
				policynocffi = (b'c', b'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 = b'py'

				# Environment variable can always force settings.
				if sys.version_info[0] >= 3:
				if 'HGMODULEPOLICY' in os.environ:
				policy = os.environ['HGMODULEPOLICY'].encode('utf-8')
				else:
				policy = os.environ.get('HGMODULEPOLICY', policy)