public static void main(String[] args) throws Err {
// Chooses the Alloy4 options
A4Options opt = new A4Options();
opt.solver = A4Options.SatSolver.SAT4J;
// abstract sig A {}
PrimSig A = new PrimSig("A", Attr.ABSTRACT);
// sig B {}
PrimSig B = new PrimSig("B");
// one sig A1 extends A {}
PrimSig A1 = new PrimSig("A1", A, Attr.ONE);
// one sig A2 extends A {}
PrimSig A2 = new PrimSig("A2", A, Attr.ONE);
// A { f: B lone->lone B }
Expr f = A.addField("f", B.lone_arrow_lone(B));
// Since (B lone->lone B) is not unary, the default is "setOf", meaning "f:set (B lone->lone
// B)"
// A { g: B }
Expr g = A.addField("g", B);
// The line above is the same as: A.addField(null, "g", B.oneOf()) since B is unary.
// If you want "setOf", you need: A.addField(null, "g", B.setOf())
// pred someG { some g }
Func someG = new Func(null, "SomeG", null, null, g.some());
// pred atMostThree[x:univ, y:univ] { #(x+y) >= 3 }
Decl x = UNIV.oneOf("x");
Decl y = UNIV.oneOf("y");
Expr body = x.get().plus(y.get()).cardinality().lte(ExprConstant.makeNUMBER(3));
Func atMost3 = new Func(null, "atMost3", Util.asList(x, y), null, body);
List<Sig> sigs = Arrays.asList(new Sig[] {A, B, A1, A2});
// run { some A && atMostThree[B,B] } for 3 but 3 int, 3 seq
Expr expr1 = A.some().and(atMost3.call(B, B));
Command cmd1 = new Command(false, 3, 3, 3, expr1);
A4Solution sol1 = TranslateAlloyToKodkod.execute_command(NOP, sigs, cmd1, opt);
System.out.println("[Solution1]:");
System.out.println(sol1.toString());
// run { some f && SomeG[] } for 3 but 2 int, 1 seq, 5 A, exactly 6 B
Expr expr2 = f.some().and(someG.call());
Command cmd2 = new Command(false, 3, 2, 1, expr2);
cmd2 = cmd2.change(A, false, 5);
cmd2 = cmd2.change(B, true, 6);
A4Solution sol2 = TranslateAlloyToKodkod.execute_command(NOP, sigs, cmd2, opt);
System.out.println("[Solution2]:");
System.out.println(sol2.toString());
}
/*
* Execute all the commands in the first file and place any counterexamples
* into the output file.
*
* If there are syntax or type errors, it may throw
* a ErrorSyntax or ErrorType or ErrorAPI or ErrorFatal exception.
* You should catch them and display them,
* and they may contain filename/line/column information.
*/
public static void main(String[] args) throws Err, FileNotFoundException {
if (args.length != 2) {
System.out.print("Usage: <alloy file> <output file>\n");
System.exit(1);
}
// The visualizer (We will initialize it to nonnull when we visualize an Alloy solution)
VizGUI viz = null;
// Alloy4 sends diagnostic messages and progress reports to the A4Reporter.
// By default, the A4Reporter ignores all these events (but you can extend the A4Reporter to
// display the event for the user)
A4Reporter rep =
new A4Reporter() {
// For example, here we choose to display each "warning" by printing it to System.out
@Override
public void warning(ErrorWarning msg) {
System.out.print("Relevance Warning:\n" + (msg.toString().trim()) + "\n\n");
System.out.flush();
}
@Override
public void solve(int primaryVars, int totalVars, int clauses) {
System.out.println(
"... solving (" + Integer.toString(primaryVars) + " primary variables)");
System.out.flush();
}
@Override
public void translate(
java.lang.String solver, int bitwidth, int maxseq, int skolemDepth, int symmetry) {
System.out.println(
"... generating CNF for "
+ solver
+ " ("
+ Integer.toString(bitwidth)
+ " bitwidth)");
System.out.flush();
}
};
String filename = args[0];
PrintStream output = new PrintStream(new File(args[1]));
// Identify yourself
System.out.println(
"Alloy Analyzer "
+ Version.version()
+ " (build: "
+ Version.buildNumber()
+ " date: "
+ Version.buildDate()
+ ")");
try {
// Parse+typecheck the model
System.out.println("Parsing and Typechecking " + filename + " ...");
Module world = CompUtil.parseEverything_fromFile(rep, null, filename);
// Choose some default options for how you want to execute the commands
A4Options options = new A4Options();
options.solver = A4Options.SatSolver.SAT4J;
boolean foundCounterExamples = false;
for (Command command : world.getAllCommands()) {
// Execute the command
System.out.println("... Executing command " + command + ":");
A4Solution ans =
TranslateAlloyToKodkod.execute_command(
rep, world.getAllReachableSigs(), command, options);
// Print the outcome
output.println(command + ":");
output.println(ans);
// If satisfiable...
if (ans.satisfiable()) {
foundCounterExamples = true;
// You can query "ans" to find out the values of each set or type.
// This can be useful for debugging.
//
// You can also write the outcome to an XML file
// ans.writeXML("alloy_example_output.xml");
//
// You can then visualize the XML file by calling this:
/*
if (viz==null) {
viz = new VizGUI(false, "alloy_example_output.xml", null);
} else {
viz.loadXML("alloy_example_output.xml", true);
}
*/
}
}
if (!foundCounterExamples)
System.out.println("\nFound no counterexamples, procedure may be correct.");
} catch (Err error) {
System.out.println(
"Alloy has encountered an error at: " + error.pos.toString() + ": " + error.msg);
}
}