diff options
| -rw-r--r-- | bitbake/lib/bb/compat.py | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/bitbake/lib/bb/compat.py b/bitbake/lib/bb/compat.py new file mode 100644 index 0000000000..c6978fccc5 --- /dev/null +++ b/bitbake/lib/bb/compat.py @@ -0,0 +1,28 @@ +"""Code pulled from future python versions, here for compatibility""" + +def total_ordering(cls): + """Class decorator that fills in missing ordering methods""" + convert = { + '__lt__': [('__gt__', lambda self, other: other < self), + ('__le__', lambda self, other: not other < self), + ('__ge__', lambda self, other: not self < other)], + '__le__': [('__ge__', lambda self, other: other <= self), + ('__lt__', lambda self, other: not other <= self), + ('__gt__', lambda self, other: not self <= other)], + '__gt__': [('__lt__', lambda self, other: other > self), + ('__ge__', lambda self, other: not other > self), + ('__le__', lambda self, other: not self > other)], + '__ge__': [('__le__', lambda self, other: other >= self), + ('__gt__', lambda self, other: not other >= self), + ('__lt__', lambda self, other: not self >= other)] + } + roots = set(dir(cls)) & set(convert) + if not roots: + raise ValueError('must define at least one ordering operation: < > <= >=') + root = max(roots) # prefer __lt__ to __le__ to __gt__ to __ge__ + for opname, opfunc in convert[root]: + if opname not in roots: + opfunc.__name__ = opname + opfunc.__doc__ = getattr(int, opname).__doc__ + setattr(cls, opname, opfunc) + return cls |