def parse(self, source, refdir=None):
"""
Parse a mixed FOF/CNF specification with includes. "source" is
either a filename or a lexer initialized with the input
text. "refdir" is the reference directory for TPTP includes.
"""
if not isinstance(source, Lexer):
source, refdir = tptpLexer(source, refdir)
while not source.TestTok(Token.EOFToken):
source.CheckLit(["cnf", "fof", "include"])
if source.TestLit("cnf"):
clause = parseClause(source)
self.addClause(clause)
elif source.TestLit("fof"):
formula = parseWFormula(source)
self.addFormula(formula)
else:
source.AcceptLit("include")
source.AcceptTok(Token.OpenPar)
name = source.LookLit()[1:-1]
source.AcceptTok(Token.SQString)
source.AcceptTok(Token.ClosePar)
source.AcceptTok(Token.FullStop)
self.parse(name, refdir)
def testClausification(self):
"""
Test conversion of wrapped formulas into lists of clauses.
"""
lex = Lexer(self.testformulas)
while not lex.TestTok(Token.EOFToken):
wf = parseWFormula(lex)
clauses = wFormulaClausify(wf)
enableDerivationOutput()
print("==================")
for c in clauses:
print(c)
toggleDerivationOutput()
def testCNFization(self):
"""
Test conversion of wrapped formulas into conjunctive normal
form.
"""
lex = Lexer(self.testformulas)
while not lex.TestTok(Token.EOFToken):
wf = parseWFormula(lex)
wf = wFormulaCNF(wf)
enableDerivationOutput()
self.assertTrue(wf.formula.isCNF())
deriv = wf.orderedDerivation()
print("==================")
for s in deriv:
print(s)
toggleDerivationOutput()