@Override
public List<Expression<Boolean>> getInterpolants(List<Expression<Boolean>> exprsn) {
Script s = new de.uni_freiburg.informatik.ultimate.smtinterpol.smtlib2.SMTInterpol();
SMTInterpolExpressionGenerator gen = new SMTInterpolExpressionGenerator(s);
ArrayList<String> names = new ArrayList<>();
s.setOption(":produce-interpolants", true);
s.setLogic(Logics.QF_LIA);
int i = 1;
for (Expression<Boolean> e : exprsn) {
Term t = gen.generateAssertion(e);
// System.out.println("T: " + t);
String name = "phi_" + (i++);
names.add(name);
s.assertTerm(s.annotate(t, new Annotation(":named", name)));
}
if (s.checkSat() == Script.LBool.UNSAT) {
Term[] terms = new Term[names.size()];
i = 0;
for (String n : names) {
terms[i++] = s.term(n);
}
Term[] interpolants;
interpolants = s.getInterpolants(terms);
// System.out.println("I: " + Arrays.toString(interpolants));
// parse result
ArrayList<Expression<Boolean>> ret = new ArrayList<>();
for (Term t : interpolants) {
// System.out.println(t);
TermParser parser = new TermParser(t, gen.getVariables());
Expression<Boolean> interpolant;
try {
interpolant = parser.parse();
} catch (TermParserException ex) {
logger.severe(ex.getMessage());
return null;
}
ret.add(interpolant);
}
return ret;
}
return null;
}
