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Move ConstantTermNormalizer #150
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80 changes: 80 additions & 0 deletions
80
Library-SMTLIB/src/de/uni_freiburg/informatik/ultimate/util/ConstantTermNormalizer.java
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/* | ||
* Copyright (C) 2009-2012 University of Freiburg | ||
* | ||
* This file is part of SMTInterpol. | ||
* | ||
* SMTInterpol is free software: you can redistribute it and/or modify | ||
* it under the terms of the GNU Lesser General Public License as published | ||
* by the Free Software Foundation, either version 3 of the License, or | ||
* (at your option) any later version. | ||
* | ||
* SMTInterpol is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU Lesser General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Lesser General Public License | ||
* along with SMTInterpol. If not, see <http://www.gnu.org/licenses/>. | ||
*/ | ||
package de.uni_freiburg.informatik.ultimate.util; | ||
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import java.math.BigDecimal; | ||
import java.math.BigInteger; | ||
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import de.uni_freiburg.informatik.ultimate.logic.ConstantTerm; | ||
import de.uni_freiburg.informatik.ultimate.logic.Rational; | ||
import de.uni_freiburg.informatik.ultimate.logic.Term; | ||
import de.uni_freiburg.informatik.ultimate.logic.TermTransformer; | ||
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/** | ||
* {@link ConstantTerm}s that have numeric sort (Int, Real) can represent their | ||
* value either as {@link BigInteger}, {@link BigDecimal}, or {@link Rational}. | ||
* This class helps us to establish a normal form in which values are always | ||
* represented by {@link Rational}s. | ||
* | ||
* @author Matthias Heizmann ([email protected]>) | ||
* | ||
*/ | ||
public class ConstantTermNormalizer extends TermTransformer { | ||
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@Override | ||
protected void convert(final Term term) { | ||
if (term instanceof ConstantTerm) { | ||
final Term res; | ||
final ConstantTerm ct = (ConstantTerm) term; | ||
res = convertConstantTerm(term, ct); | ||
setResult(res); | ||
} else { | ||
super.convert(term); | ||
} | ||
} | ||
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private static Term convertConstantTerm(final Term term, final ConstantTerm ct) { | ||
if (!ct.getSort().isNumericSort()) { | ||
// do nothing, only applicable to numeric sorts | ||
return ct; | ||
} | ||
if (ct.getValue() instanceof BigInteger) { | ||
final Rational rat = Rational.valueOf((BigInteger) ct.getValue(), BigInteger.ONE); | ||
return rat.toTerm(term.getSort()); | ||
} else if (ct.getValue() instanceof BigDecimal) { | ||
final BigDecimal decimal = (BigDecimal) ct.getValue(); | ||
Rational rat; | ||
if (decimal.scale() <= 0) { | ||
final BigInteger num = decimal.toBigInteger(); | ||
rat = Rational.valueOf(num, BigInteger.ONE); | ||
} else { | ||
final BigInteger num = decimal.unscaledValue(); | ||
final BigInteger denom = BigInteger.TEN.pow(decimal.scale()); | ||
rat = Rational.valueOf(num, denom); | ||
} | ||
return rat.toTerm(term.getSort()); | ||
} else if (ct.getValue() instanceof Rational) { | ||
// do nothing, already in normal form | ||
return ct; | ||
} else { | ||
throw new AssertionError("Value has to be either BigInteger, Decimal, or Rational"); | ||
} | ||
} | ||
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} |
61 changes: 0 additions & 61 deletions
61
...pol/src/de/uni_freiburg/informatik/ultimate/smtinterpol/model/ConstantTermNormalizer.java
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Why two input parameters? You can also use
ct.getSort()
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Fixed.