ReferenceEvaluator.java

package com.drawbridge.jsengine.ast;

import java.util.LinkedList;

import com.drawbridge.jsengine.Scope;
import com.drawbridge.jsengine.jsobjects.JSReference;
import com.drawbridge.jsengine.jsobjects.JSType;
import com.drawbridge.vl.blocks.BlockIdentifier;
import com.google.caja.parser.js.Identifier;
import com.google.caja.parser.js.Reference;

public class ReferenceEvaluator extends Evaluator
{
	/*
	 * An expression that evaluates to the value associated with the property of
	 * the same name in either the current scope chain, or the object to the
	 * left of a dot-operator.
	 */

	private Identifier	identifier;

	public ReferenceEvaluator(Evaluator parent, Scope scope, Reference reference) {
		super(parent, scope, reference.getFilePosition());
		identifier = reference.getIdentifier();

	}

	@Override
	public JSType evaluate() throws EvaluatorException
	{
		JSReference result = new JSReference(identifier.getValue());

		return result;
	}

	@Override
	public LinkedList<com.drawbridge.vl.blocks.Block> getBlocks()
	{
		LinkedList<com.drawbridge.vl.blocks.Block> results = new LinkedList<com.drawbridge.vl.blocks.Block>();
		results.add(new BlockIdentifier(getFilePosition(), this, identifier.getName()));
		return results;
	}

	public Identifier getIdentifier()
	{
		return identifier;
	}

	@Override
	public boolean compare(Evaluator e)
	{
		if (!e.getClass().equals(getClass()))
			return false;
		ReferenceEvaluator re = (ReferenceEvaluator) e;

		if (identifier.getValue().equals(re.identifier.getValue()) && e.getFilePosition().equals(getFilePosition()))
			return true;
		else
			return false;
	}

}