plugins/org.eclipse.dltk.ruby.core/src/org/eclipse/dltk/ruby/typeinference/evaluators/AssignmentEvaluator.java

/*******************************************************************************
 * Copyright (c) 2005, 2016 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
 *
 *******************************************************************************/
package org.eclipse.dltk.ruby.typeinference.evaluators;

import org.eclipse.dltk.ast.ASTNode;
import org.eclipse.dltk.ruby.ast.RubyAssignment;
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;

public class AssignmentEvaluator extends GoalEvaluator {

	private IEvaluatedType result;

	public AssignmentEvaluator(IGoal goal) {
		super(goal);
	}

	@Override
	public IGoal[] init() {
		ExpressionTypeGoal typedGoal = (ExpressionTypeGoal) goal;
		ASTNode expression = (typedGoal).getExpression();
		if (!(expression instanceof RubyAssignment)) {
			return IGoal.NO_GOALS;
		}
		RubyAssignment expr = (RubyAssignment) expression;
		return new IGoal[] { new ExpressionTypeGoal(typedGoal.getContext(),
				expr.getRight()) };
	}

	@Override
	public IGoal[] subGoalDone(IGoal subgoal, Object result, GoalState state) {
		this.result = (IEvaluatedType) result;
		return IGoal.NO_GOALS;
	}

	@Override
	public Object produceResult() {
		return result;
	}
}