# Licensed to the Apache Software Foundation (ASF) under one
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# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Created on Jul 27, 2019
#
# @author: ballance
from pyboolector import BoolectorNode
[docs]class ConstraintModel(object):
"""Base class for all constraint models"""
def __init__(self):
self.node = None
self.srcinfo = None
pass
[docs] def dispose(self):
self.node = None
[docs] def build(self, btor, soft=False)->BoolectorNode:
raise Exception("build unimplemented for constraint " + str(type(self)))
[docs] def get_nodes(self, node_l):
raise Exception("get_node unimplemented")
[docs] @staticmethod
def and_nodelist(node_l, btor):
"""Creates a boolean AND across a list of expression nodes"""
ret = None
ret_valid = False
for n in node_l:
if ret_valid:
ret = btor.And(ret, n)
else:
ret = n
ret_valid = True
return ret
[docs] def accept(self, visitor):
raise NotImplementedError("" + str(self) + "::accept unimplemented")
[docs] def clone(self, deep=False)->'ConstraintModel':
raise NotImplementedError("clone not implemented by " + str(type(self)))