org.sonar.javascript.se.sv.PlusSymbolicValue 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 java.util.Optional;
import org.sonar.javascript.se.Constraint;
import org.sonar.javascript.se.ProgramState;
/**
* This class represents symbolic value for binary "+" expression.
* E.g.
* x + y
* "str" + foo
*/
public class PlusSymbolicValue implements SymbolicValue {
private static final Constraint NUMBER_OR_BOOLEAN = Constraint.ANY_NUMBER.or(Constraint.ANY_BOOLEAN);
private final SymbolicValue firstOperandValue;
private final SymbolicValue secondOperandValue;
public PlusSymbolicValue(SymbolicValue firstOperandValue, SymbolicValue secondOperandValue) {
this.firstOperandValue = firstOperandValue;
this.secondOperandValue = secondOperandValue;
}
@Override
public Optional constrainDependencies(ProgramState state, Constraint constraint) {
return Optional.of(state);
}
@Override
public Constraint baseConstraint(ProgramState state) {
Constraint firstConstraint = state.getConstraint(firstOperandValue);
Constraint secondConstraint = state.getConstraint(secondOperandValue);
if (atLeastOneUndefined(firstConstraint, secondConstraint) &&
(atLeastOneNumberOrBoolean(firstConstraint, secondConstraint) || bothUndefined(firstConstraint, secondConstraint))) {
return Constraint.NAN;
}
if (atLeastOneString(firstConstraint, secondConstraint)) {
return Constraint.STRING_PRIMITIVE;
} else if (bothNumberOrBoolean(firstConstraint, secondConstraint)) {
return Constraint.NUMBER_PRIMITIVE;
}
return Constraint.NUMBER_PRIMITIVE.or(Constraint.STRING_PRIMITIVE);
}
private static boolean bothUndefined(Constraint firstConstraint, Constraint secondConstraint) {
return firstConstraint.isStricterOrEqualTo(Constraint.UNDEFINED) && secondConstraint.isStricterOrEqualTo(Constraint.UNDEFINED);
}
private static boolean atLeastOneString(Constraint firstConstraint, Constraint secondConstraint) {
return firstConstraint.isStricterOrEqualTo(Constraint.ANY_STRING) || secondConstraint.isStricterOrEqualTo(Constraint.ANY_STRING);
}
private static boolean atLeastOneUndefined(Constraint firstConstraint, Constraint secondConstraint) {
return firstConstraint.isStricterOrEqualTo(Constraint.UNDEFINED) || secondConstraint.isStricterOrEqualTo(Constraint.UNDEFINED);
}
private static boolean atLeastOneNumberOrBoolean(Constraint firstConstraint, Constraint secondConstraint) {
return firstConstraint.isStricterOrEqualTo(NUMBER_OR_BOOLEAN) || secondConstraint.isStricterOrEqualTo(NUMBER_OR_BOOLEAN);
}
private static boolean bothNumberOrBoolean(Constraint firstConstraint, Constraint secondConstraint) {
return firstConstraint.isStricterOrEqualTo(NUMBER_OR_BOOLEAN) && secondConstraint.isStricterOrEqualTo(NUMBER_OR_BOOLEAN);
}
@Override
public String toString() {
return firstOperandValue + " + " + secondOperandValue;
}
}