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https://github.com/AdaCore/cvc5.git
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7ff15aa749
This refactors the Solver class in the java API to extend AbstractPointer similar to other cvc5 classes. It also cleans up redundant code for Abstract pointers. and adds Context.deletePointers to java examples as mentioned in issue #10052.
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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* Mudathir Mohamed, Tianyi Liang, Andres Noetzli
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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) 2009-2022 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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Solver slv = new Solver();
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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 = slv.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 = slv.mkString(str_ab);
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Term abc = slv.mkString("abc");
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// String variables
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Term x = slv.mkConst(string, "x");
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Term y = slv.mkConst(string, "y");
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Term z = slv.mkConst(string, "z");
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// String concatenation: x.ab.y
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Term lhs = slv.mkTerm(STRING_CONCAT, x, ab, y);
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// String concatenation: abc.z
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Term rhs = slv.mkTerm(STRING_CONCAT, abc, z);
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// x.ab.y = abc.z
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Term formula1 = slv.mkTerm(EQUAL, lhs, rhs);
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// Length of y: |y|
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Term leny = slv.mkTerm(STRING_LENGTH, y);
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// |y| >= 0
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Term formula2 = slv.mkTerm(GEQ, leny, slv.mkInteger(0));
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// Regular expression: (ab[c-e]*f)|g|h
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Term r = slv.mkTerm(REGEXP_UNION,
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slv.mkTerm(REGEXP_CONCAT,
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slv.mkTerm(STRING_TO_REGEXP, slv.mkString("ab")),
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slv.mkTerm(
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REGEXP_STAR, slv.mkTerm(REGEXP_RANGE, slv.mkString("c"), slv.mkString("e"))),
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slv.mkTerm(STRING_TO_REGEXP, slv.mkString("f"))),
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slv.mkTerm(STRING_TO_REGEXP, slv.mkString("g")),
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slv.mkTerm(STRING_TO_REGEXP, slv.mkString("h")));
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// String variables
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Term s1 = slv.mkConst(string, "s1");
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Term s2 = slv.mkConst(string, "s2");
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// String concatenation: s1.s2
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Term s = slv.mkTerm(STRING_CONCAT, s1, s2);
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// s1.s2 in (ab[c-e]*f)|g|h
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Term formula3 = slv.mkTerm(STRING_IN_REGEXP, s, r);
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// Make a query
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Term q = slv.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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