import: Add PGN Parser (WIP)

Change-Id: Id30d5f2af097d7216eda906dc52d9d3aa68a9a9b

src/ui/flutter_app/lib/game_page/services/controller/game_controller.dart

@@ -69,6 +69,7 @@ class GameController {
       ValueNotifier<String?>(null);
 
   String? get initialSharingMoveList => _initialSharingMoveList;
+
   set initialSharingMoveList(String? list) {
     _initialSharingMoveList = list;
     initialSharingMoveListNotifier.value = list;
@@ -79,9 +80,11 @@ class GameController {
   late AnimationManager animationManager;
 
   bool _isInitialized = false;
+
   bool get initialized => _isInitialized;
 
   bool get isPositionSetup => gameRecorder.setupPosition != null;
+
   void clearPositionSetupFlag() => gameRecorder.setupPosition = null;
 
   @visibleForTesting
@@ -427,5 +430,5 @@ class GameController {
 
   /// Starts a game export.
   static Future<void> export(BuildContext context) async =>
-      ImportService.exportGame(context);
+      ExportService.exportGame(context);
 }

src/ui/flutter_app/lib/game_page/services/controller/game_responses.dart

@@ -120,11 +120,3 @@ class HistoryRange implements HistoryResponse {
     return "${HistoryResponse.tag} Current is equal to moveIndex.";
   }
 }
-
-/// Custom response to throw when importing the game history.
-abstract class ImportResponse {}
-
-class ImportFormatException extends FormatException {
-  const ImportFormatException([String? source, int? offset])
-      : super("Cannot import ", source, offset);
-}

src/ui/flutter_app/lib/game_page/services/engine/position.dart

@@ -139,14 +139,17 @@ class Position {
   ExtMove? _record;
 
   static List<List<List<int>>> get _millTable => _Mills.millTableInit;
+
   static List<List<int>> get _adjacentSquares => _Mills.adjacentSquaresInit;
 
   static List<List<int>> get _millLinesHV => _Mills._horizontalAndVerticalLines;
+
   static List<List<int>> get _millLinesD => _Mills._diagonalLines;
 
   PieceColor pieceOnGrid(int index) => _grid[index];
 
   PieceColor get sideToMove => _sideToMove;
+
   set sideToMove(PieceColor color) {
     _sideToMove = color;
     _them = _sideToMove.opponent;

src/ui/flutter_app/lib/game_page/services/import_export/export_service.dart

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2019-2025 The Sanmill developers (see AUTHORS file)
+
+// export_service.dart
+
+part of '../mill.dart';
+
+class ExportService {
+  const ExportService._();
+
+  /// Exports the game to the device's clipboard.
+  static Future<void> exportGame(BuildContext context) async {
+    await Clipboard.setData(
+      ClipboardData(text: GameController().gameRecorder.moveHistoryText),
+    );
+
+    if (!context.mounted) {
+      return;
+    }
+
+    rootScaffoldMessengerKey.currentState!
+        .showSnackBarClear(S.of(context).moveHistoryCopied);
+
+    Navigator.pop(context);
+  }
+}

src/ui/flutter_app/lib/game_page/services/import_export/import_exceptions.dart

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2019-2025 The Sanmill developers (see AUTHORS file)
+
+// import_exceptions.dart
+
+part of '../mill.dart';
+
+/// Custom response to throw when importing the game history.
+abstract class ImportResponse {}
+
+class ImportFormatException extends FormatException {
+  const ImportFormatException([String? source, int? offset])
+      : super("Cannot import ", source, offset);
+}