/**

  * 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;

 final 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 CharSequence 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.subSequence(i, memberStart).toString());

                 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.subSequence(i, in.length()).toString());

                 break;

             }

         }

     }

     static interface Sink {

         void javascript(String s);

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

         void field(String clazz, String field);

     }

 }