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/******************************************************************************
* Top contributors (to current version):
* Andres Noetzli, Aina Niemetz, Tianyi Liang
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 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.
* ****************************************************************************
*
* A simple demonstration of reasoning about sequences with cvc5 via C++ API.
*/
import static io.github.cvc5.api.Kind.*;
import io.github.cvc5.api.*;
public class Sequences
{
public static void main(String args[]) throws CVC5ApiException
{
Solver slv = new Solver();
// Set the logic
slv.setLogic("QF_SLIA");
// Produce models
slv.setOption("produce-models", "true");
// The option strings-exp is needed
slv.setOption("strings-exp", "true");
// Set output language to SMTLIB2
slv.setOption("output-language", "smt2");
// Sequence sort
Sort intSeq = slv.mkSequenceSort(slv.getIntegerSort());
// Sequence variables
Term x = slv.mkConst(intSeq, "x");
Term y = slv.mkConst(intSeq, "y");
// Empty sequence
Term empty = slv.mkEmptySequence(slv.getIntegerSort());
// Sequence concatenation: x.y.empty
Term concat = slv.mkTerm(SEQ_CONCAT, x, y, empty);
// Sequence length: |x.y.empty|
Term concat_len = slv.mkTerm(SEQ_LENGTH, concat);
// |x.y.empty| > 1
Term formula1 = slv.mkTerm(GT, concat_len, slv.mkInteger(1));
// Sequence unit: seq(1)
Term unit = slv.mkTerm(SEQ_UNIT, slv.mkInteger(1));
// x = seq(1)
Term formula2 = slv.mkTerm(EQUAL, x, unit);
// Make a query
Term q = slv.mkTerm(AND, formula1, formula2);
// check sat
Result result = slv.checkSatAssuming(q);
System.out.println("cvc5 reports: " + q + " is " + result + ".");
if (result.isSat())
{
System.out.println(" x = " + slv.getValue(x));
System.out.println(" y = " + slv.getValue(y));
}
}
}
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