// We assume that the formula is in QBF
// (But no other assumption)
public static bool Solve(FormulaCNF.QBCNFormula qbcnf)
{
// Now create a QDIMACS file and send it to
// a QBF solver
CreateQDIMACS(qbcnf, tempFile);
solverThread = new Process();
solverThread.StartInfo.FileName = solverFile;
solverThread.StartInfo.Arguments = tempFile;
solverThread.StartInfo.RedirectStandardOutput = true;
solverThread.StartInfo.RedirectStandardError = true;
solverThread.StartInfo.UseShellExecute = false;
solverThread.Start();
solverThread.WaitForExit();
if (solverThread.ExitCode != retSAT && solverThread.ExitCode != retUNSAT)
{
throw new Exception("Unexpected exit code from solver: " + solverThread.ExitCode.ToString());
}
return(solverThread.ExitCode == retSAT);
}
private static void CreateQDIMACS(FormulaCNF.QBCNFormula qbcnf, string filename)
{
using (StreamWriter sw = File.CreateText(filename))
{
// Write preamble
sw.WriteLine("p cnf " + qbcnf.quantifiers.Count +
" " + qbcnf.propositional.Count);
// Write prefix
if (qbcnf.quantifiers.Count > 0)
{
char lastQuant = qbcnf.quantifiers[0][0];
sw.Write(lastQuant + " " + qbcnf.quantifiers[0].Substring(1));
for (int i = 1; i < qbcnf.quantifiers.Count; i++)
{
if (qbcnf.quantifiers[i][0] != lastQuant)
{
sw.Write(" 0");
sw.WriteLine();
sw.Write(qbcnf.quantifiers[i][0] + " ");
lastQuant = qbcnf.quantifiers[i][0];
}
sw.Write(" " + qbcnf.quantifiers[i].Substring(1));
}
sw.Write(" 0");
sw.WriteLine();
}
// Write clauses
foreach (ISet <string> clause in qbcnf.propositional)
{
foreach (string literal in clause)
{
sw.Write(literal + " ");
}
sw.Write("0");
sw.WriteLine();
}
}
}
