/**

 * 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('/', '_');

    }

}