[LIB-9] Set of entities for PGN parsing and formatting

[chesshog.git] / chesshog-format / src / main / java / org / hedgecode / chess / pgn / token / MovesToken.java

diff --git a/chesshog-format/src/main/java/org/hedgecode/chess/pgn/token/MovesToken.java b/chesshog-format/src/main/java/org/hedgecode/chess/pgn/token/MovesToken.java
new file mode 100644 (file)
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+++ b/chesshog-format/src/main/java/org/hedgecode/chess/pgn/token/MovesToken.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2018-2020. Developed by Hedgecode.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.hedgecode.chess.pgn.token;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.hedgecode.chess.pgn.PGNUtils;
+import org.hedgecode.chess.pgn.entity.Moves;
+import org.hedgecode.chess.position.ParseException;
+
+/**
+ * MovesToken
+ *
+ * @author Dmitry Samoshin aka gotty
+ */
+public class MovesToken<Entity extends Moves> implements Token<Entity> {
+
+    enum Type {
+
+        MOVE      ( new MoveToken()      ),
+        COMMENT   ( new CommentToken()   ),
+        VARIATION ( new VariationToken() );
+
+        private Token<Moves> token;
+
+        public Token<Moves> token() {
+            return token;
+        }
+
+        Type(Token<Moves> token) {
+            this.token = token;
+        }
+    }
+
+    private static final String MOVES_REGEX = "^\\s*([^\\s])";
+    private static final Pattern MOVES_PATTERN = Pattern.compile(MOVES_REGEX);
+
+    private static final String COMMENT = "{";
+    private static final String VARIATION = "(";
+
+    @Override
+    public int token(Entity entity, String pgn) throws ParseException {
+        int pgnLength = pgn.length();
+        pgn = PGNUtils.stripCrlf(pgn);
+        Token<Moves> token = assignToken(pgn);
+        while (token != null) {
+            int index = token.token(entity, pgn);
+            pgn = pgn.substring(index);
+            token = assignToken(pgn);
+        }
+        return pgnLength;
+    }
+
+    private Token<Moves> assignToken(String pgn) {
+        Token<Moves> token = null;
+        Matcher moveMatcher = MOVES_PATTERN.matcher(pgn);
+        if (moveMatcher.find()) {
+            switch (moveMatcher.group(1)) {
+                case COMMENT:
+                    token = Type.COMMENT.token();
+                    break;
+                case VARIATION:
+                    token = Type.VARIATION.token();
+                    break;
+                default:
+                    token = Type.MOVE.token();
+            }
+        }
+        return token;
+    }
+
+}