--- /dev/null	2015-08-19 08:52:04.000000000 +0530
+++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/tools/PartialParser.java	2015-08-19 08:52:03.242607100 +0530
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.nashorn.tools;
+
+import jdk.nashorn.internal.runtime.Context;
+
+/**
+ * Partial parsing support for code completion of expressions.
+ */
+public interface PartialParser {
+    /**
+     * Parse potentially partial code and keep track of the start of last expression.
+     *
+     * @param context the nashorn context
+     * @param code code that is to be parsed
+     * @return the start index of the last expression parsed in the (incomplete) code.
+     */
+    public int getLastExpressionStart(final Context context, final String code);
+}