org.sosy_lab.solver.mathsat5.Mathsat5RationalFormulaManager Maven / Gradle / Ivy

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Unified acccess layer to SMT solvers
There is a newer version: 5.0.1
/*
 *  JavaSMT is an API wrapper for a collection of SMT solvers.
 *  This file is part of JavaSMT.
 *
 *  Copyright (C) 2007-2015  Dirk Beyer
 *  All rights reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.sosy_lab.solver.mathsat5;

import static org.sosy_lab.solver.mathsat5.Mathsat5NativeApi.msat_make_number;
import static org.sosy_lab.solver.mathsat5.Mathsat5NativeApi.msat_make_times;
import static org.sosy_lab.solver.mathsat5.Mathsat5NativeApi.msat_make_true;
import static org.sosy_lab.solver.mathsat5.Mathsat5NativeApi.msat_term_repr;

import org.sosy_lab.solver.api.FormulaType;
import org.sosy_lab.solver.api.NumeralFormula;
import org.sosy_lab.solver.api.NumeralFormula.RationalFormula;
import org.sosy_lab.solver.api.RationalFormulaManager;

import java.math.BigDecimal;

class Mathsat5RationalFormulaManager
    extends Mathsat5NumeralFormulaManager
    implements RationalFormulaManager {

  Mathsat5RationalFormulaManager(Mathsat5FormulaCreator pCreator) {
    super(pCreator);
  }

  @Override
  protected long getNumeralType() {
    return getFormulaCreator().getRationalType();
  }

  @Override
  public FormulaType getFormulaType() {
    return FormulaType.RationalType;
  }

  @Override
  protected Long makeNumberImpl(double pNumber) {
    return makeNumberImpl(Double.toString(pNumber));
  }

  @Override
  protected Long makeNumberImpl(BigDecimal pNumber) {
    return makeNumberImpl(pNumber.toPlainString());
  }

  @Override
  public Long divide(Long pNumber1, Long pNumber2) {
    if (!isNumeral(pNumber2)) {
      return super.divide(pNumber1, pNumber2);
    }
    long mathsatEnv = getFormulaCreator().getEnv();
    long t1 = pNumber1;
    long t2 = pNumber2;

    // invert t2 and multiply with it
    String n = msat_term_repr(t2);
    if (n.startsWith("(")) {
      n = n.substring(1, n.length() - 1);
    }
    String[] frac = n.split("/");
    if (frac.length == 1) {
      n = "1/" + n;
    } else {
      assert (frac.length == 2);
      n = frac[1] + "/" + frac[0];
    }
    t2 = msat_make_number(mathsatEnv, n);
    return msat_make_times(mathsatEnv, t2, t1);
  }

  @Override
  protected Long modularCongruence(Long pNumber1, Long pNumber2, long pModulo) {
    return msat_make_true(getFormulaCreator().getEnv());
  }
}