PGN

Author: Pastor

server/src/test/java/ru/base/game/server/dto/chess/Main.java

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+package ru.base.game.server.dto.chess;
+
+import java.io.IOException;
+
+public abstract class Main {
+    public static void main(String[] args) throws IOException {
+        PortableGameNotation notation =
+            new PortableGameNotation.Default(Main.class.getResourceAsStream("/chess/1992.11.04.pgn"));
+        System.out.println(notation);
+    }
+}

server/src/test/java/ru/base/game/server/dto/chess/PortableGameNotation.java

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+package ru.base.game.server.dto.chess;
+
+import com.google.common.io.CharStreams;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public interface PortableGameNotation {
+
+    enum Kind {
+        KING, ROOK, BISHOP, KNIGHT, PAWN
+    }
+
+    enum Color {
+        WHITE, BLACK
+    }
+
+    interface Element {
+    }
+
+    sealed interface Metadata extends Element {
+        record Value(String name, String text) implements Metadata {
+
+        }
+    }
+
+    sealed interface Move extends Element {
+        enum Type {
+            SIMPLE, CASTLING
+        }
+
+        record Line(int index, Step white, Step black) implements Move {
+
+        }
+
+        record Step(Kind kind,
+                    Color color,
+                    Optional<Position> from,
+                    Optional<Position> to,
+                    boolean capturing,
+                    boolean checking,
+                    Type type) {
+
+        }
+    }
+
+    record Position(int x, int y) {
+
+    }
+
+    final class Default implements PortableGameNotation {
+        private static final Pattern GRU = Pattern.compile(
+            "(\\[(\\w+)\\s+\\\"(.*)\\\"\\]|\\d+\\.((([BQKNR]?([a-h1-8]?)x?[a-h][1-8]\\+?)|O-O|O-O-O)\\s(\\{(.*)\\}\\s)?){2})");
+        private final Map<String, Metadata> metadata = new HashMap<>();
+        private final List<Move> moves = new ArrayList<>();
+
+        private Default(Reader reader) throws IOException {
+            this(CharStreams.toString(reader));
+        }
+
+        private Default(String text) throws IOException {
+            parse(text);
+        }
+
+        public Default(InputStream stream) throws IOException {
+            this(new InputStreamReader(stream, StandardCharsets.UTF_8));
+        }
+
+        private void parse(String text) {
+            metadata.clear();
+            moves.clear();
+            Matcher matcher = GRU.matcher(text);
+            matcher.results().forEach(result -> {
+                int grouped = result.groupCount();
+                if (grouped > 0) {
+                    String value = result.group(4);
+                    if (value == null) {
+                        metadata.put(result.group(2), new Metadata.Value(result.group(2), result.group(3)));
+                    } else {
+                        System.out.println("Found group '" + grouped + "'");
+                        for (int i = 0; i < grouped; i++) {
+                            System.out.printf("%d. %s%n", i, result.group(i));
+                        }
+                    }
+                }
+            });
+        }
+    }
+}

server/src/test/resources/chess/1992.11.04.pgn

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+[Event "F/S Return Match"]
+[Site "Belgrade, Serbia JUG"]
+[Date "1992.11.04"]
+[Round "29"]
+[White "Fischer, Robert J."]
+[Black "Spassky, Boris V."]
+[Result "1/2-1/2"]
+
+1.e4 e5 2.Nf3 Nc6 3.Bb5 {This opening is called the Ruy Lopez.} a6
+4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d4 Nbd7
+11.c4 c6 12.cxb5 axb5 13.Nc3 Bb7 14.Bg5 b4 15.Nb1 h6 16.Bh4 c5 17.dxe5
+Nxe4 18.Bxe7 Qxe7 19.exd6 Qf6 20.Nbd2 Nxd6 21.Nc4 Nxc4 22.Bxc4 Nb6
+23.Ne5 Rae8 24.Bxf7+ Rxf7 25.Nxf7 Rxe1+ 26.Qxe1 Kxf7 27.Qe3 Qg5 28.Qxg5
+hxg5 29.b3 Ke6 30.a3 Kd6 31.axb4 cxb4 32.Ra5 Nd5 33.f3 Bc8 34.Kf2 Bf5
+35.Ra7 g6 36.Ra6+ Kc5 37.Ke1 Nf4 38.g3 Nxh3 39.Kd2 Kb5 40.Rd6 Kc5 41.Ra6
+Nf2 42.g4 Bd3 43.Re6 1/2-1/2