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/********************* */
/*! \file Combination.java
** \verbatim
** Top contributors (to current version):
** Pat Hawks
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief [[ Add one-line brief description here ]]
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
import static org.junit.Assert.assertEquals;
import org.junit.Before;
import org.junit.Test;
import edu.nyu.acsys.CVC4.*;
public class Combination {
static {
System.loadLibrary("cvc4jni");
}
ExprManager em;
SmtEngine smt;
@Before
public void initialize() {
em = new ExprManager();
smt = new SmtEngine(em);
}
@Test
public void evaluatesExpression() {
smt.setOption("tlimit", new SExpr(100));
smt.setOption("produce-models", new SExpr(true)); // Produce Models
smt.setOption("output-language", new SExpr("cvc4")); // output-language
smt.setOption("default-dag-thresh", new SExpr(0)); //Disable dagifying the output
smt.setLogic("QF_UFLIRA");
// Sorts
SortType u = em.mkSort("u");
Type integer = em.integerType();
Type booleanType = em.booleanType();
Type uToInt = em.mkFunctionType(u, integer);
Type intPred = em.mkFunctionType(integer, booleanType);
// Variables
Expr x = em.mkVar("x", u);
Expr y = em.mkVar("y", u);
// Functions
Expr f = em.mkVar("f", uToInt);
Expr p = em.mkVar("p", intPred);
// Constants
Expr zero = em.mkConst(new Rational(0));
Expr one = em.mkConst(new Rational(1));
// Terms
Expr f_x = em.mkExpr(Kind.APPLY_UF, f, x);
Expr f_y = em.mkExpr(Kind.APPLY_UF, f, y);
Expr sum = em.mkExpr(Kind.PLUS, f_x, f_y);
Expr p_0 = em.mkExpr(Kind.APPLY_UF, p, zero);
Expr p_f_y = em.mkExpr(Kind.APPLY_UF, p, f_y);
// Construct the assumptions
Expr assumptions =
em.mkExpr(Kind.AND,
em.mkExpr(Kind.LEQ, zero, f_x), // 0 <= f(x)
em.mkExpr(Kind.LEQ, zero, f_y), // 0 <= f(y)
em.mkExpr(Kind.LEQ, sum, one), // f(x) + f(y) <= 1
p_0.notExpr(), // not p(0)
p_f_y); // p(f(y))
smt.assertFormula(assumptions);
assertEquals(
Result.Validity.VALID,
smt.query(em.mkExpr(Kind.DISTINCT, x, y)).isValid()
);
assertEquals(
Result.Sat.SAT,
smt.checkSat(em.mkConst(true)).isSat()
);
}
}
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