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

/*******************************************************************************
 * Copyright (c) 2005, 2016 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.ruby.typeinference.evaluators;

import org.eclipse.dltk.ruby.ast.RubyCallArgument;
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;

public class RubyArgumentTypeEvaluator extends GoalEvaluator {

	private Object result;

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

	@Override
	public IGoal[] init() {
		ExpressionTypeGoal goal = (ExpressionTypeGoal) this.getGoal();
		RubyCallArgument arg = (RubyCallArgument) goal.getExpression();
		if (arg.getValue() != null)
			return new IGoal[] { new ExpressionTypeGoal(goal.getContext(), arg
					.getValue()) };
		return IGoal.NO_GOALS;
	}

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

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

}