/*******************************************************************************
* Copyright (c) 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Zend Technologies
*******************************************************************************/
package org.eclipse.php.internal.core.typeinference.evaluators;
import org.eclipse.dltk.evaluation.types.SimpleType;
import org.eclipse.dltk.ti.GoalState;
import org.eclipse.dltk.ti.goals.ExpressionTypeGoal;
import org.eclipse.dltk.ti.goals.GoalEvaluator;
import org.eclipse.dltk.ti.goals.IGoal;
import org.eclipse.dltk.ti.types.IEvaluatedType;
import org.eclipse.php.internal.core.compiler.ast.nodes.UnaryOperation;
public class UnaryOperationEvaluator extends GoalEvaluator {
private IEvaluatedType result;
public UnaryOperationEvaluator(IGoal goal) {
super(goal);
}
public IGoal[] init() {
ExpressionTypeGoal typedGoal = (ExpressionTypeGoal) goal;
UnaryOperation unaryOp = (UnaryOperation) typedGoal.getExpression();
switch (unaryOp.getOperatorType()) {
case UnaryOperation.OP_MINUS:
case UnaryOperation.OP_PLUS:
result = new SimpleType(SimpleType.TYPE_NUMBER);
break;
case UnaryOperation.OP_TILDA:
return new IGoal[] { new ExpressionTypeGoal(goal.getContext(),
unaryOp.getExpr()) };
case UnaryOperation.OP_NOT:
result = new SimpleType(SimpleType.TYPE_BOOLEAN);
break;
}
return IGoal.NO_GOALS;
}
public IGoal[] subGoalDone(IGoal subgoal, Object result, GoalState state) {
this.result = (IEvaluatedType) result;
return IGoal.NO_GOALS;
}
public Object produceResult() {
return result;
}
}