import subprocess
import logging
import re
from . import SMTLibSolverBackend, PopenSolverProxy
from ...errors import MissingSolverError
log = logging.getLogger(__name__)
[docs]def get_version():
try:
version_string = subprocess.check_output(["abc", "--help"]).decode("utf-8")
# version_match = re.match('This is CVC4 version (.*)\n', version_string)
# if not version_match:
# return False, None, "Found malformed version string: {}".format(version_string)
return True, None, None # True, version_match.group(1), None
except subprocess.CalledProcessError as ex:
return False, None, f"Not found, error: {ex}"
except OSError as ex:
return False, None, f"Not found, error: {ex}"
IS_INSTALLED, VERSION, ERROR = get_version()
[docs]class ABCProxy(PopenSolverProxy):
[docs] def __init__(self):
self.installed = False
p = None
super().__init__(p)
[docs] def create_process(self):
if not IS_INSTALLED:
raise MissingSolverError("ABC not found! Please install ABC before using this backend")
p = subprocess.Popen(["abc"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
self.installed = True
return p
[docs]class SolverBackendABC(SMTLibSolverBackend):
[docs] def solver(self, timeout=None, max_memory=None):
"""
This function should return an instance of whatever object handles
solving for this backend. For example, in Z3, this would be z3.Solver().
"""
return ABCProxy()
from ... import backend_manager as backend_manager
backend_manager.backends._register_backend(SolverBackendABC(), "smtlib_abc", False, False)