interfaces: introduce and use a protocol class for the `charencoding` module
See
f2832de2a46c for details when this was done for the `bdiff` module.
This lets us dump the hack where the `pure` implementation was imported during
the type checking phase to provide signatures for the module methods it
provides. Now the protocol classes are starting to shine, because these methods
are provided by `pure.charencoding` and `cext.parsers`, and references to
`cffi.charencoding` and `cext.charencoding` are forwarded to them as appropriate
by the `policy` module. But none of that matters, as long as the module
returned provides the listed methods.
The interface was copy/pasted from the `pure` module, but `jsonescapeu8fallback`
is omitted because it is accessed from the `pure` module directly when the
escaping fails in the primary module's `jsonescapeu8()`.
#!/usr/bin/env python2
import argparse
import os
import subprocess
import sys
try:
# Always load hg libraries from the hg we can find on $PATH.
hglib = subprocess.check_output(['hg', 'debuginstall', '-T', '{hgmodules}'])
sys.path.insert(0, os.path.dirname(hglib))
except subprocess.CalledProcessError:
# We're probably running with a PyOxidized Mercurial, so just
# proceed and hope it works out okay.
pass
from mercurial import util
ap = argparse.ArgumentParser()
ap.add_argument(
'--paranoid',
action='store_true',
help=(
"Be paranoid about how version numbers compare and "
"produce something that's more likely to sort "
"reasonably."
),
)
ap.add_argument('--selftest', action='store_true', help='Run self-tests.')
ap.add_argument('versionfile', help='Path to a valid mercurial __version__.py')
def paranoidver(ver):
"""Given an hg version produce something that distutils can sort.
Some Mac package management systems use distutils code in order to
figure out upgrades, which makes life difficult. The test case is
a reduced version of code in the Munki tool used by some large
organizations to centrally manage OS X packages, which is what
inspired this kludge.
>>> paranoidver('3.4')
'3.4.0'
>>> paranoidver('3.4.2')
'3.4.2'
>>> paranoidver('3.0-rc+10')
'2.9.9999-rc+10'
>>> paranoidver('4.2+483-5d44d7d4076e')
'4.2.0+483-5d44d7d4076e'
>>> paranoidver('4.2.1+598-48d1e1214d8c')
'4.2.1+598-48d1e1214d8c'
>>> paranoidver('4.3-rc')
'4.2.9999-rc'
>>> paranoidver('4.3')
'4.3.0'
>>> from distutils import version
>>> class LossyPaddedVersion(version.LooseVersion):
... '''Subclass version.LooseVersion to compare things like
... "10.6" and "10.6.0" as equal'''
... def __init__(self, s):
... self.parse(s)
...
... def _pad(self, version_list, max_length):
... 'Pad a version list by adding extra 0 components to the end'
... # copy the version_list so we don't modify it
... cmp_list = list(version_list)
... while len(cmp_list) < max_length:
... cmp_list.append(0)
... return cmp_list
...
... def __cmp__(self, other):
... if isinstance(other, str):
... other = MunkiLooseVersion(other)
... max_length = max(len(self.version), len(other.version))
... self_cmp_version = self._pad(self.version, max_length)
... other_cmp_version = self._pad(other.version, max_length)
... return cmp(self_cmp_version, other_cmp_version)
>>> def testver(older, newer):
... o = LossyPaddedVersion(paranoidver(older))
... n = LossyPaddedVersion(paranoidver(newer))
... return o < n
>>> testver('3.4', '3.5')
True
>>> testver('3.4.0', '3.5-rc')
True
>>> testver('3.4-rc', '3.5')
True
>>> testver('3.4-rc+10-deadbeef', '3.5')
True
>>> testver('3.4.2', '3.5-rc')
True
>>> testver('3.4.2', '3.5-rc+10-deadbeef')
True
>>> testver('4.2+483-5d44d7d4076e', '4.2.1+598-48d1e1214d8c')
True
>>> testver('4.3-rc', '4.3')
True
>>> testver('4.3', '4.3-rc')
False
"""
major, minor, micro, extra = util.versiontuple(ver, n=4)
if micro is None:
micro = 0
if extra:
if extra.startswith('rc'):
if minor == 0:
major -= 1
minor = 9
else:
minor -= 1
micro = 9999
extra = '-' + extra
else:
extra = '+' + extra
else:
extra = ''
return '%d.%d.%d%s' % (major, minor, micro, extra)
def main(argv):
opts = ap.parse_args(argv[1:])
if opts.selftest:
import doctest
doctest.testmod()
return
with open(opts.versionfile) as f:
for l in f:
if l.startswith('version = b'):
# version number is entire line minus the quotes
ver = l[len('version = b') + 1 : -2]
break
if opts.paranoid:
print(paranoidver(ver))
else:
print(ver)
if __name__ == '__main__':
main(sys.argv)