fe6f39b662
- Get rid of pkgsort() usage for preferred variants. - Concretization is now entirely based on key-based sorting. - Remove PreferredPackages class and various spec cmp() methods. - Replace with PackagePrefs class that implements a key function for sorting according to packages.yaml. - Clear package pref caches on config test. - Explicit compare methods instead of total_ordering in Version. - Our total_ordering backport wasn't making Python 3 happy for some reason. - Python 3's functools.total_ordering and spelling the operators out fixes the problem. - Fix unicode issues with spec hashes, json, & YAML - Try to use str everywhere and avoid unicode objects in python 2.
48 lines
1.9 KiB
Python
48 lines
1.9 KiB
Python
#
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# Backport of Python 2.7's total_ordering.
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#
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def total_ordering(cls):
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"""Class decorator that fills in missing ordering methods"""
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convert = {
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'__lt__': [('__gt__', lambda self, other: not (self < other or self == other)),
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('__le__', lambda self, other: self < other or self == other),
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('__ge__', lambda self, other: not self < other)],
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'__le__': [('__ge__', lambda self, other: not self <= other or self == other),
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('__lt__', lambda self, other: self <= other and not self == other),
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('__gt__', lambda self, other: not self <= other)],
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'__gt__': [('__lt__', lambda self, other: not (self > other or self == other)),
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('__ge__', lambda self, other: self > other or self == other),
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('__le__', lambda self, other: not self > other)],
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'__ge__': [('__le__', lambda self, other: (not self >= other) or self == other),
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('__gt__', lambda self, other: self >= other and not self == other),
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('__lt__', lambda self, other: not self >= other)]
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}
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roots = set(dir(cls)) & set(convert)
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if not roots:
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raise ValueError('must define at least one ordering operation: < > <= >=')
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root = max(roots) # prefer __lt__ to __le__ to __gt__ to __ge__
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for opname, opfunc in convert[root]:
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if opname not in roots:
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opfunc.__name__ = opname
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opfunc.__doc__ = getattr(int, opname).__doc__
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setattr(cls, opname, opfunc)
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return cls
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@total_ordering
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class reverse_order(object):
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"""Helper for creating key functions.
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This is a wrapper that inverts the sense of the natural
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comparisons on the object.
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"""
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def __init__(self, value):
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self.value = value
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def __eq__(self, other):
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return other.value == self.value
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def __lt__(self, other):
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return other.value < self.value
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