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rules.py
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rules.py
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# Copyright (C) 2008 Ross Burton <ross@burtonini.com>
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
# St, Fifth Floor, Boston, MA 02110-1301 USA
class Rule:
def __init__(self, source, **kwargs):
cls = self.__getSourceClass(source)
self.args = {}
for (name, expected_type) in cls.getProperties():
v = kwargs[name]
if not isinstance(v, expected_type):
# TODO: beat the value into shape if we need to
raise TypeError("%s isn't a %s" % (name, expected_type))
self.args[name] = v
self.source = cls(self.args)
def __getSourceClass(self, name):
import sources
c = getattr(sources, name, None)
if c and c is not sources.Source and issubclass(c, sources.Source):
return c
raise NameError, "Cannot find source %s" % name
def evaluate(self):
return self.source.evaluate(self.args)