org.sonar.javascript.se.sv.UnaryMinusSymbolicValue Maven / Gradle / Ivy
/*
* SonarQube JavaScript Plugin
* Copyright (C) 2011-2018 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.javascript.se.sv;
import com.google.common.collect.ImmutableMap;
import java.util.Map;
import java.util.Optional;
import org.sonar.javascript.se.Constraint;
import org.sonar.javascript.se.ProgramState;
import static org.sonar.javascript.se.Constraint.NAN;
import static org.sonar.javascript.se.Constraint.NEGATIVE_NUMBER_PRIMITIVE;
import static org.sonar.javascript.se.Constraint.NUMBER_PRIMITIVE;
import static org.sonar.javascript.se.Constraint.POSITIVE_NUMBER_PRIMITIVE;
import static org.sonar.javascript.se.Constraint.ZERO;
/**
* Symbolic value used for numeric negation ("-x")
*/
public class UnaryMinusSymbolicValue implements SymbolicValue {
private final SymbolicValue operandValue;
private static final Map CONSTRAINT_TRANSITIONS = ImmutableMap.builder()
.put(POSITIVE_NUMBER_PRIMITIVE, NEGATIVE_NUMBER_PRIMITIVE)
.put(NEGATIVE_NUMBER_PRIMITIVE, POSITIVE_NUMBER_PRIMITIVE)
.put(NEGATIVE_NUMBER_PRIMITIVE.or(ZERO), POSITIVE_NUMBER_PRIMITIVE.or(ZERO))
.put(POSITIVE_NUMBER_PRIMITIVE.or(ZERO), NEGATIVE_NUMBER_PRIMITIVE.or(ZERO))
.put(ZERO, ZERO)
.put(NAN, NAN).build();
public UnaryMinusSymbolicValue(SymbolicValue operandValue) {
this.operandValue = operandValue;
}
@Override
public Optional constrainDependencies(ProgramState state, Constraint constraint) {
return Optional.of(state);
}
@Override
public Constraint baseConstraint(ProgramState state) {
Constraint constraint = CONSTRAINT_TRANSITIONS.get(state.getConstraint(operandValue));
if (constraint == null) {
return NUMBER_PRIMITIVE;
}
return constraint;
}
}