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.Pattern;
21 import org.hedgecode.chess.pgn.entity.Moves;
22 import org.hedgecode.chess.pgn.entity.Variation;
23 import org.hedgecode.chess.position.ParseException;
28 * @author Dmitry Samoshin aka gotty
30 public class VariationToken implements Token<Moves> {
32 private static final char OPEN_VARIATION = '(';
33 private static final char CLOSE_VARIATION = ')';
35 private static final String VARIATION_REGEX = "^\\s*\\(([^)]+)\\)";
36 private static final Pattern VARIATION_PATTERN = Pattern.compile(VARIATION_REGEX);
39 public int token(Moves moves, String pgn) throws ParseException {
40 int startToken = pgn.indexOf(OPEN_VARIATION);
41 int endToken = endToken(pgn, startToken);
42 Variation variation = new Variation();
43 Token<Variation> variationToken = new MovesToken<>();
45 variation, pgn.substring(startToken + 1, endToken)
47 moves.currentMove().addVariation(variation);
51 private int endToken(String pgn, int startToken) throws ParseException {
52 int open = pgn.indexOf(OPEN_VARIATION, startToken + 1);
53 int close = pgn.indexOf(CLOSE_VARIATION, startToken + 1);
54 while (open >= 0 && open < close) {
55 open = pgn.indexOf(OPEN_VARIATION, open + 1);
56 close = pgn.indexOf(CLOSE_VARIATION, close + 1);
59 throw new ParseException("parse.pgn.incorrect.variation", pgn);