mirror of
https://github.com/AdaCore/cvc5.git
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95 lines
3.0 KiB
Java
95 lines
3.0 KiB
Java
/******************************************************************************
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* Top contributors (to current version):
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* Daniel Larraz, Mudathir Mohamed, Tianyi Liang
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*
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* This file is part of the cvc5 project.
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*
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* Copyright (c) 2009-2025 by the authors listed in the file AUTHORS
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* in the top-level source directory and their institutional affiliations.
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* All rights reserved. See the file COPYING in the top-level source
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* directory for licensing information.
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* ****************************************************************************
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*
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* A simple demonstration of reasoning about strings with cvc5 via C++ API.
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*/
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import static io.github.cvc5.Kind.*;
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import io.github.cvc5.*;
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public class Strings
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{
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public static void main(String args[]) throws CVC5ApiException
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{
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TermManager tm = new TermManager();
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Solver slv = new Solver(tm);
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{
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// Set the logic
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slv.setLogic("QF_SLIA");
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// Produce models
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slv.setOption("produce-models", "true");
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// The option strings-exp is needed
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slv.setOption("strings-exp", "true");
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// Set output language to SMTLIB2
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slv.setOption("output-language", "smt2");
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// String type
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Sort string = tm.getStringSort();
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// std::string
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String str_ab = "ab";
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// String constants
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Term ab = tm.mkString(str_ab);
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Term abc = tm.mkString("abc");
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// String variables
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Term x = tm.mkConst(string, "x");
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Term y = tm.mkConst(string, "y");
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Term z = tm.mkConst(string, "z");
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// String concatenation: x.ab.y
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Term lhs = tm.mkTerm(STRING_CONCAT, x, ab, y);
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// String concatenation: abc.z
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Term rhs = tm.mkTerm(STRING_CONCAT, abc, z);
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// x.ab.y = abc.z
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Term formula1 = tm.mkTerm(EQUAL, lhs, rhs);
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// Length of y: |y|
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Term leny = tm.mkTerm(STRING_LENGTH, y);
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// |y| >= 0
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Term formula2 = tm.mkTerm(GEQ, leny, tm.mkInteger(0));
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// Regular expression: (ab[c-e]*f)|g|h
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Term r = tm.mkTerm(REGEXP_UNION,
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tm.mkTerm(REGEXP_CONCAT,
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tm.mkTerm(STRING_TO_REGEXP, tm.mkString("ab")),
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tm.mkTerm(REGEXP_STAR, tm.mkTerm(REGEXP_RANGE, tm.mkString("c"), tm.mkString("e"))),
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tm.mkTerm(STRING_TO_REGEXP, tm.mkString("f"))),
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tm.mkTerm(STRING_TO_REGEXP, tm.mkString("g")),
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tm.mkTerm(STRING_TO_REGEXP, tm.mkString("h")));
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// String variables
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Term s1 = tm.mkConst(string, "s1");
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Term s2 = tm.mkConst(string, "s2");
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// String concatenation: s1.s2
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Term s = tm.mkTerm(STRING_CONCAT, s1, s2);
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// s1.s2 in (ab[c-e]*f)|g|h
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Term formula3 = tm.mkTerm(STRING_IN_REGEXP, s, r);
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// Make a query
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Term q = tm.mkTerm(AND, formula1, formula2, formula3);
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// check sat
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Result result = slv.checkSatAssuming(q);
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System.out.println("cvc5 reports: " + q + " is " + result + ".");
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if (result.isSat())
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{
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System.out.println(" x = " + slv.getValue(x));
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System.out.println(" s1.s2 = " + slv.getValue(s));
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}
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}
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Context.deletePointers();
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}
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}
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