/** Private method. Prompts for a solver until valid value is specified by the user. */
private static Solver promptSolver(Scanner scanner) {
System.out.println("Select algorithm:");
String line = scanner.nextLine();
Solver solver = Solver.fromIdentifier(line.trim());
if (solver != null) {
return solver;
} else {
System.out.println("Invalid input.");
return promptSolver(scanner);
}
}
/**
* Main entry point.
*
* <p>Can be used in interactive and non-interactive mode.
*/
public static void main(String[] args) {
int argc = args.length;
Solver solver = null;
SATFormula formula = null;
switch (argc) {
case 0:
{
Scanner scanner = new Scanner(System.in);
solver = promptSolver(scanner);
System.out.println("Enter the clause definition (end with Ctrl+D):");
List<String> lines = new ArrayList<>();
while (scanner.hasNextLine()) {
lines.add(scanner.nextLine().trim());
}
scanner.close();
formula = parseFormula(lines);
break;
}
case 2:
Path path = Paths.get(args[1]);
Reader reader = null;
try {
reader = new Reader(path);
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
solver = Solver.fromIdentifier(args[0]);
if (solver == null) {
System.err.println("Error: unsupported algorithm.");
System.exit(-1);
}
formula = parseFormula(reader);
break;
default:
System.out.println("Error: wrong usage.");
System.exit(-1);
}
System.out.println("Solution: " + solver.solve(formula));
}