compatibility.py
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上传日期:2021-03-01
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- """
- @file compatibility.py
- @brief Classes that manage compatibility states.
- $LicenseInfo:firstyear=2007&license=mit$
- Copyright (c) 2007-2010, Linden Research, Inc.
- Permission is hereby granted, free of charge, to any person obtaining a copy
- of this software and associated documentation files (the "Software"), to deal
- in the Software without restriction, including without limitation the rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
- The above copyright notice and this permission notice shall be included in
- all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- THE SOFTWARE.
- $/LicenseInfo$
- """
- """Compatibility combination table:
- I M O N S
- -- -- -- -- --
- I: I I I I I
- M: I M M M M
- O: I M O M O
- N: I M M N N
- S: I M O N S
- """
- class _Compatibility(object):
- def __init__(self, reason):
- self.reasons = [ ]
- if reason:
- self.reasons.append(reason)
-
- def combine(self, other):
- if self._level() <= other._level():
- return self._buildclone(other)
- else:
- return other._buildclone(self)
-
- def prefix(self, leadin):
- self.reasons = [ leadin + r for r in self.reasons ]
-
- def same(self): return self._level() >= 1
- def deployable(self): return self._level() > 0
- def resolved(self): return self._level() > -1
- def compatible(self): return self._level() > -2
-
- def explain(self):
- return self.__class__.__name__ + "n" + "n".join(self.reasons) + "n"
-
- def _buildclone(self, other=None):
- c = self._buildinstance()
- c.reasons = self.reasons
- if other:
- c.reasons = c.reasons + other.reasons
- return c
-
- def _buildinstance(self):
- return self.__class__(None)
- # def _level(self):
- # raise RuntimeError('implement in subclass')
- class Incompatible(_Compatibility):
- def _level(self):
- return -2
- class Mixed(_Compatibility):
- def __init__(self, *inputs):
- _Compatibility.__init__(self, None)
- for i in inputs:
- self.reasons += i.reasons
-
- def _buildinstance(self):
- return self.__class__()
-
- def _level(self):
- return -1
- class _Aged(_Compatibility):
- def combine(self, other):
- if self._level() == other._level():
- return self._buildclone(other)
- if int(self._level()) == int(other._level()):
- return Mixed(self, other)
- return _Compatibility.combine(self, other)
- class Older(_Aged):
- def _level(self):
- return -0.25
-
- class Newer(_Aged):
- def _level(self):
- return 0.25
- class Same(_Compatibility):
- def __init__(self):
- _Compatibility.__init__(self, None)
-
- def _buildinstance(self):
- return self.__class__()
-
- def _level(self):
- return 1