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92 lines
3.0 KiB
Java
92 lines
3.0 KiB
Java
/********************* */
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/*! \file Strings.java
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** \verbatim
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** Top contributors (to current version):
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** Tianyi Liang, Andres Noetzli
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** This file is part of the CVC4 project.
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** Copyright (c) 2009-2021 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.\endverbatim
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**
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** \brief Reasoning about strings with CVC4 via Java API.
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**
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** A simple demonstration of reasoning about strings with CVC4 via Jave API.
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**/
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import edu.stanford.CVC4.*;
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public class Strings {
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public static void main(String[] args) {
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System.loadLibrary("cvc4jni");
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ExprManager em = new ExprManager();
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SmtEngine smt = new SmtEngine(em);
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// Set the logic
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smt.setLogic("S");
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// Produce models
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smt.setOption("produce-models", new SExpr(true));
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// The option strings-exp is needed
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smt.setOption("strings-exp", new SExpr(true));
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// output-language
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smt.setOption("output-language", new SExpr("smt2"));
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// String type
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Type string = em.stringType();
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// String constants
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Expr ab = em.mkConst(new CVC4String("ab"));
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Expr abc = em.mkConst(new CVC4String("abc"));
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// Variables
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Expr x = em.mkVar("x", string);
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Expr y = em.mkVar("y", string);
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Expr z = em.mkVar("z", string);
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// String concatenation: x.ab.y
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Expr lhs = em.mkExpr(Kind.STRING_CONCAT, x, ab, y);
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// String concatenation: abc.z
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Expr rhs = em.mkExpr(Kind.STRING_CONCAT, abc, z);;
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// x.ab.y = abc.z
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Expr formula1 = em.mkExpr(Kind.EQUAL, lhs, rhs);
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// Length of y: |y|
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Expr leny = em.mkExpr(Kind.STRING_LENGTH, y);
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// |y| >= 0
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Expr formula2 = em.mkExpr(Kind.GEQ, leny, em.mkConst(new Rational(0)));
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// Regular expression: (ab[c-e]*f)|g|h
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Expr r = em.mkExpr(Kind.REGEXP_UNION,
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em.mkExpr(Kind.REGEXP_CONCAT,
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em.mkExpr(Kind.STRING_TO_REGEXP, em.mkConst(new CVC4String("ab"))),
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em.mkExpr(Kind.REGEXP_STAR,
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em.mkExpr(Kind.REGEXP_RANGE, em.mkConst(new CVC4String("c")), em.mkConst(new CVC4String("e")))),
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em.mkExpr(Kind.STRING_TO_REGEXP, em.mkConst(new CVC4String("f")))),
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em.mkExpr(Kind.STRING_TO_REGEXP, em.mkConst(new CVC4String("g"))),
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em.mkExpr(Kind.STRING_TO_REGEXP, em.mkConst(new CVC4String("h"))));
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// String variables
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Expr s1 = em.mkVar("s1", string);
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Expr s2 = em.mkVar("s2", string);
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// String concatenation: s1.s2
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Expr s = em.mkExpr(Kind.STRING_CONCAT, s1, s2);
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// s1.s2 in (ab[c-e]*f)|g|h
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Expr formula3 = em.mkExpr(Kind.STRING_IN_REGEXP, s, r);
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// Make a query
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Expr q = em.mkExpr(Kind.AND,
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formula1,
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formula2,
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formula3);
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// check sat
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Result result = smt.checkSat(q);
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System.out.println("CVC4 reports: " + q + " is " + result + ".");
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System.out.println(" x = " + smt.getValue(x));
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System.out.println(" s1.s2 = " + smt.getValue(s));
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}
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}
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