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"""Compatibility helpers.
This module provides classes, variables and imports which are used to
support packaging across Python 2.x and 3.x.
"""
from packaging import logger
# XXX Having two classes with the same name is not a good thing.
# XXX 2to3-related code should move from util to this module
# TODO Move common code here: PY3 (bool indicating if we're on 3.x), any, etc.
try:
from packaging.util import Mixin2to3 as _Mixin2to3
_CONVERT = True
_KLASS = _Mixin2to3
except ImportError:
_CONVERT = False
_KLASS = object
__all__ = ['Mixin2to3']
class Mixin2to3(_KLASS):
""" The base class which can be used for refactoring. When run under
Python 3.0, the run_2to3 method provided by Mixin2to3 is overridden.
When run on Python 2.x, it merely creates a class which overrides run_2to3,
yet does nothing in particular with it.
"""
if _CONVERT:
def _run_2to3(self, files, doctests=[], fixers=[]):
""" Takes a list of files and doctests, and performs conversion
on those.
- First, the files which contain the code(`files`) are converted.
- Second, the doctests in `files` are converted.
- Thirdly, the doctests in `doctests` are converted.
"""
if fixers:
self.fixer_names = fixers
logger.info('converting Python code')
_KLASS.run_2to3(self, files)
logger.info('converting doctests in Python files')
_KLASS.run_2to3(self, files, doctests_only=True)
if doctests != []:
logger.info('converting doctest in text files')
_KLASS.run_2to3(self, doctests, doctests_only=True)
else:
# If run on Python 2.x, there is nothing to do.
def _run_2to3(self, files, doctests=[], fixers=[]):
pass
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