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https://github.com/AdaCore/cvc5.git
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7440f0568b
This PR adds (most of) the existing examples to the documentation, and does some other minor updates on the documentation. Some details: - for consistency, all cpp examples are moved from examples/api to examples/api/cpp - add capabilities for SMT-LIB examples, and two simple smt2 examples - more docs/examples/*.rst files - two new documentation categories: installation (how to obtain, compile and install cvc5) and binary (about the cvc5 binary)
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
/******************************************************************************
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* Top contributors (to current version):
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* Aina Niemetz, Tianyi Liang, Mudathir Mohamed
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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) 2009-2021 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.
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* ****************************************************************************
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*
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* A simple demonstration of reasoning about strings with CVC4 via C++ API.
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*/
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#include <cvc5/cvc5.h>
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#include <iostream>
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using namespace cvc5::api;
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int main()
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{
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Solver slv;
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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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std::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(REGEXP_STAR,
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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,
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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 = slv.checkSatAssuming(q);
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std::cout << "CVC4 reports: " << q << " is " << result << "." << std::endl;
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if(result.isSat())
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{
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std::cout << " x = " << slv.getValue(x) << std::endl;
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std::cout << " s1.s2 = " << slv.getValue(s) << std::endl;
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}
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}
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