examples/api/java/PipedInput.java


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/******************************************************************************
 * Top contributors (to current version):
 *   Morgan Deters, Andres Noetzli
 *
 * 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 the input parsing capabilities of CVC4 when
 * used from Java.
 */

import edu.stanford.CVC4.*;
import java.io.*;

public class PipedInput {
  public static void main(String[] args) throws IOException {
    System.loadLibrary("cvc4jni");

    // Boilerplate setup for CVC4
    ExprManager exprMgr = new ExprManager();
    SmtEngine smt = new SmtEngine(exprMgr);
    smt.setOption("output-language", new SExpr("smt2"));

    // Set up a pair of connected Java streams
    PipedOutputStream solverPipe = new PipedOutputStream();
    PrintWriter toSolver = new PrintWriter(solverPipe);
    PipedInputStream stream = new PipedInputStream(solverPipe);

    // Write some things to CVC4's input stream, making sure to flush()
    toSolver.println("(set-logic QF_LIA)");
    toSolver.println("(declare-fun x () Int)");
    toSolver.println("(assert (= x 5))");
    toSolver.println("(check-sat)");
    toSolver.flush();

    // Set up the CVC4 parser
    ParserBuilder pbuilder =
      new ParserBuilder(exprMgr, "<string 1>")
      .withInputLanguage(InputLanguage.INPUT_LANG_SMTLIB_V2)
      .withLineBufferedStreamInput((java.io.InputStream)stream);
    Parser parser = pbuilder.build();

    // Read all the commands thus far
    Command cmd;
    while((cmd = parser.nextCommand()) != null) {
      System.out.println(cmd);
      cmd.invoke(smt, System.out);
    }

    // Write some more things to CVC4's input stream, making sure to flush()
    toSolver.println("(assert (= x 10))");
    toSolver.println("(check-sat)");
    toSolver.flush();

    // Read all the commands thus far
    while((cmd = parser.nextCommand()) != null) {
      System.out.println(cmd);
      cmd.invoke(smt, System.out);
    }
  }
}