def _mk_lemma_parser(self):
if self._lemma_parser is not None:
return
self._lemma_parser = SmtLibZ3Parser()
# register symbols that are expected to appear in the lemma
for i, symbol in enumerate(self._pysmt_sig):
name = self._mk_lemma_arg_name(i)
self._lemma_parser.cache.bind(name, symbol)
def load_model_from_smt2_str(smt2_str):
model = FolModel()
b = io.StringIO(smt2_str)
parser = SmtLibZ3Parser()
for cmd in parser.get_command_generator(b):
if type(cmd) == SmtLibCommand and cmd.name == 'define-fun':
name = cmd.args[0]
lmbd = define_fun_to_lambda(parser.env, cmd)
model[name] = lmbd
return model
def load_model_from_file(fname):
log.info('Loading model file {}'.format(fname))
model = FolModel()
with open(fname, 'r') as script:
parser = SmtLibZ3Parser()
for cmd in parser.get_command_generator(script):
if type(cmd) == SmtLibCommand and cmd.name == 'define-fun':
name = cmd.args[0]
lmbd = define_fun_to_lambda(parser.env, cmd)
model[name] = lmbd
return model
def back_via_smtlib(self, expr):
"""Back convert a Z3 Expression by translation to SMT-LIB."""
from six import StringIO
from pysmt.smtlib.parser import SmtLibZ3Parser
parser = SmtLibZ3Parser(self.env)
z3.Z3_set_ast_print_mode(expr.ctx.ref(), z3.Z3_PRINT_SMTLIB2_COMPLIANT)
s = z3.Z3_benchmark_to_smtlib_string(expr.ctx.ref(), None, None, None,
None, 0, None, expr.ast)
stream_in = StringIO(s)
r = parser.get_script(stream_in).get_last_formula(self.mgr)
key = (askey(expr), None)
self._back_memoization[key] = r
return r