/**

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  *

  * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved.

  *

  * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

  * Other names may be trademarks of their respective owners.

  *

  * The contents of this file are subject to the terms of either the GNU

  * General Public License Version 2 only ("GPL") or the Common

  * Development and Distribution License("CDDL") (collectively, the

  * "License"). You may not use this file except in compliance with the

  * License. You can obtain a copy of the License at

  * http://www.netbeans.org/cddl-gplv2.html

  * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

  * specific language governing permissions and limitations under the

  * License.  When distributing the software, include this License Header

  * Notice in each file and include the License file at

  * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the GPL Version 2 section of the License file that

  * accompanied this code. If applicable, add the following below the

  * License Header, with the fields enclosed by brackets [] replaced by

  * your own identifying information:

  * "Portions Copyrighted [year] [name of copyright owner]"

  *

  * Contributor(s):

  *

  * The Original Software is NetBeans. The Initial Developer of the Original

  * Software is Oracle. Portions Copyright 2013-2013 Oracle. All Rights Reserved.

  *

  * If you wish your version of this file to be governed by only the CDDL

  * or only the GPL Version 2, indicate your decision by adding

  * "[Contributor] elects to include this software in this distribution

  * under the [CDDL or GPL Version 2] license." If you do not indicate a

  * single choice of license, a recipient has the option to distribute

  * your version of this file under either the CDDL, the GPL Version 2 or

  * to extend the choice of license to its licensees as provided above.

  * However, if you add GPL Version 2 code and therefore, elected the GPL

  * Version 2 license, then the option applies only if the new code is

  * made subject to such option by the copyright holder.

  */

 package org.netbeans.html.boot.impl;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 abstract class JsCallback {

     final String parse(String body) {

         StringBuilder sb = new StringBuilder();

         int pos = 0;

         for (;;) {

             int next = body.indexOf(".@", pos);

             if (next == -1) {

                 sb.append(body.substring(pos));

                 body = sb.toString();

                 break;

             }

             int ident = next;

             while (ident > 0) {

                 if (!Character.isJavaIdentifierPart(body.charAt(--ident))) {

                     ident++;

                     break;

                 }

             }

             String refId = body.substring(ident, next);

             sb.append(body.substring(pos, ident));

             int sigBeg = body.indexOf('(', next);

             int sigEnd = body.indexOf(')', sigBeg);

             int colon4 = body.indexOf("::", next);

             if (sigBeg == -1 || sigEnd == -1 || colon4 == -1) {

                 throw new IllegalStateException(

                     "Wrong format of instance callback. "

                     + "Should be: 'inst.@pkg.Class::method(Ljava/lang/Object;)(param)':\n" 

                     + body

                 );

             }

             String fqn = body.substring(next + 2, colon4);

             String method = body.substring(colon4 + 2, sigBeg);

             String params = body.substring(sigBeg, sigEnd + 1);

             int paramBeg = body.indexOf('(', sigEnd + 1);

             if (paramBeg == -1) {

                 throw new IllegalStateException(

                     "Wrong format of instance callback. "

                     + "Should be: 'inst.@pkg.Class::method(Ljava/lang/Object;)(param)':\n" 

                     + body

                 );

             }

             sb.append(callMethod(refId, fqn, method, params));

             if (body.charAt(paramBeg + 1) != (')')) {

                 sb.append(",");

             }

             pos = paramBeg + 1;

         }

         pos = 0;

         sb = null;

         for (;;) {

             int next = body.indexOf("@", pos);

             if (next == -1) {

                 if (sb == null) {

                     return body;

                 }

                 sb.append(body.substring(pos));

                 return sb.toString();

             }

             if (sb == null) {

                 sb = new StringBuilder();

             }

             sb.append(body.substring(pos, next));

             int sigBeg = body.indexOf('(', next);

             int sigEnd = body.indexOf(')', sigBeg);

             int colon4 = body.indexOf("::", next);

             if (sigBeg == -1 || sigEnd == -1 || colon4 == -1) {

                 throw new IllegalStateException(

                     "Wrong format of static callback. "

                     + "Should be: '@pkg.Class::staticMethod(Ljava/lang/Object;)(param)':\n" 

                     + body

                 );

             }

             String fqn = body.substring(next + 1, colon4);

             String method = body.substring(colon4 + 2, sigBeg);

             String params = body.substring(sigBeg, sigEnd + 1);

             int paramBeg = body.indexOf('(', sigEnd + 1);

             sb.append(callMethod(null, fqn, method, params));

             pos = paramBeg + 1;

         }

     }

     protected abstract CharSequence callMethod(

         String ident, String fqn, String method, String params

     );

     static String mangle(String fqn, String method, String params) {

         if (params.startsWith("(")) {

             params = params.substring(1);

         }

         if (params.endsWith(")")) {

             params = params.substring(0, params.length() - 1);

         }

         return 

             replace(fqn) + "$" + replace(method) + "$" + replace(params);

     }

     private static String replace(String orig) {

         return orig.replace("_", "_1").

             replace(";", "_2").

             replace("[", "_3").

             replace('.', '_').replace('/', '_');

     }

 }