/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program 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 for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.bck2brwsr.ide.editor;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class JsniCommentTokenizer {

    /**

     * Tokenize the contents of JSNI comment into the provided {@linkplain Sink}.

     * @param in the contents of JSNI comment

     * @param out the sink that consumes parsed tokens

     */

    public void process(final String in, final Sink out) {

        final Matcher member = Pattern.compile("@([^:]+)::([a-zA-Z_$][a-zA-Z\\d_$]*)").matcher(in);

        final Matcher signature = Pattern.compile("\\(([^\\)]*)\\)").matcher(in);

        int i = 0;

        while (true) {

            if (member.find(i)) {

                final int memberStart = member.start();

                final int memberEnd = member.end();

                if (memberStart > i) out.javascript(in.substring(i, memberStart));

                final String clazz = member.group(1);

                final String name = member.group(2);

                if (in.charAt(memberEnd) == '(') {

                    if (!signature.find(memberEnd)) {

                        throw new IllegalStateException("Expected method signature");

                    }

                    assert signature.start() == memberEnd;

                    out.method(clazz, name, signature.group(1));

                    i = signature.end();

                } else {

                    out.field(clazz, name);

                    i = memberEnd;

                }

            } else {

                out.javascript(in.substring(i, in.length()));

                break;

            }

        }

    }

    public static interface Sink {

        void javascript(String s);

        void method(String clazz, String method, String signature);

        void field(String clazz, String field);

    }

}