2 * Copyright (c) 2018-2020. Developed by Hedgecode.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package org.hedgecode.chess.pgn.token;
19 import java.util.regex.Matcher;
20 import java.util.regex.Pattern;
22 import org.hedgecode.chess.pgn.PGNConstants;
23 import org.hedgecode.chess.pgn.entity.Game;
24 import org.hedgecode.chess.position.ParseException;
29 * @author Dmitry Samoshin aka gotty
31 public class EmptyToken implements Token<Game> {
33 private static final String EMPTY_REGEX = "^\\s*$";
34 private static final Pattern EMPTY_PATTERN = Pattern.compile(EMPTY_REGEX, Pattern.MULTILINE);
37 public int token(Game game, String pgn) throws ParseException {
38 Matcher matcher = EMPTY_PATTERN.matcher(pgn);
39 if (!matcher.find()) {
40 throw new ParseException("parse.pgn.incorrect.empty", pgn);
42 return pgn.indexOf(PGNConstants.PGN_CRLF) + 1;