package net.sourceforge.htmlunit;

import org.junit.Test;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextAction;
import org.mozilla.javascript.Scriptable;

/**
 * Test for a basic implementation of caller property on functions.
 * Implementation is not yet good enough to propose a patch to Rhino.
 * @author Marc Guillemot
 */
public class FunctionCaller {

	/**
	 * JS catch block should always catch JS exceptions
	 */
	@Test
	public void callee() throws Exception {
		final String script = "function f() {\n"
			+ "  var c = arguments.callee.caller;\n"
			+ "  if (c) throw 'got: ' + c;\n"
			+ "  if (g.caller) throw 'got: ' + c;\n"
			+ "  g();\n"
			+ "  if (g.caller) throw 'after g() got: ' + g.caller;\n"
			+ "}\n"
			+ "function g() {\n"
			+ "  var c = arguments.callee.caller;\n"
			+ "  if (c != f) throw 'got: ' + c;\n"
			+ "}\n"
			+ "f();\n";
		
		final ContextAction action = new ContextAction() {
			public Object run(final Context cx) {
				final Scriptable scope = cx.initStandardObjects();
				
				cx.evaluateString(scope, script, "test.js", 1, null);

				return null;
			}
		};
		Utils.runWithOptimizationLevel(action, -1);
	}
}