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# Copyright: 2005 Gentoo Foundation
# Author(s): Brian Harring (ferringb@gentoo.org)
# License: GPL2
# $Header: /local/data/ulm/cvs/history/var/cvsroot/gentoo-src/portage/portage/restrictions/restriction.py,v 1.9 2005/08/16 00:21:49 ferringb Exp $
import re, logging
class base(object):
"""base restriction matching object; overrides setattr to provide the usual write once trickery
all derivatives *must* be __slot__ based"""
__slots__ = ["negate"]
package_matching = False
def __init__(self, negate=False):
self.negate = negate
# def __setattr__(self, name, value):
# import traceback;traceback.print_stack()
# object.__setattr__(self, name, value)
# try: getattr(self, name)
#
# except AttributeError:
# object.__setattr__(self, name, value)
# else: raise AttributeError
def match(self, *arg, **kwargs):
raise NotImplementedError
force_False = force_True = match
def cmatch(self, pkg, *val):
m=self.match(value)
if m ^ self.negate:
return True
elif pkg == None or attr == None:
return False
elif self.negate:
return pkg.request_disable(attr, value)
return pkg.request_enable(attr, value)
def intersect(self, other):
return None
def __len__(self):
return 1
class AlwaysBoolMatch(base):
__slots__ = base.__slots__
def match(self, *a, **kw): return self.negate
def __str__(self): return "always '%s'" % self.negate
def cmatch(self, *a, **kw): return self.negate
AlwaysFalse = AlwaysBoolMatch(False)
AlwaysTrue = AlwaysBoolMatch(True)
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