75 lines
2.1 KiB
Dart
75 lines
2.1 KiB
Dart
import 'package:flutter/foundation.dart';
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import 'package:flutter_stockfish_plugin/stockfish_bindings.dart';
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import 'package:flutter_stockfish_plugin/stockfish_native_bindings.dart'
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if (dart.library.html) 'package:flutter_stockfish_plugin/stockfish_web_bindings.dart';
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import 'package:flutter_stockfish_plugin/stockfish_state.dart';
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final StockfishChessEngineAbstractBindings _bindings =
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StockfishChessEngineBindings();
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class Stockfish {
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final _state = StockfishStateClass();
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Stockfish._() {
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_state.setValue(StockfishState.starting);
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_bindings.stockfishMain(() {
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_state.setValue(StockfishState.ready);
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}).then((exitCode) {
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_state.setValue(
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exitCode == 0 ? StockfishState.disposed : StockfishState.error);
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_instance = null;
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}, onError: (error) {
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_state.setValue(StockfishState.error);
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_instance = null;
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});
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}
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static Stockfish? _instance;
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/// Creates a C++ engine.
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///
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/// This may throws a [StateError] if an active instance is being used.
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/// Owner must [dispose] it before a new instance can be created.
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factory Stockfish() {
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if (_instance != null) {
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throw StateError('Multiple instances are not supported, yet.');
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}
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_instance = Stockfish._();
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return _instance!;
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}
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/// The current state of the underlying C++ engine.
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ValueListenable<StockfishState> get state => _state;
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/// The standard output stream.
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Stream<String> get stdout => _bindings.read;
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/// The standard input sink.
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set stdin(String line) {
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final stateValue = state.value;
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if (stateValue != StockfishState.ready) {
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throw StateError('Stockfish is not ready ($stateValue)');
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}
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_bindings.write(line);
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}
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/// Stops the C++ engine.
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void dispose() {
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final stateValue = state.value;
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if (stateValue == StockfishState.ready) {
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stdin = 'quit';
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}
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}
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void _cleanUp(int exitCode) {
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/*_stdoutController.close();
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_mainSubscription.cancel();
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_stdoutSubscription.cancel();
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_state._setValue(
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exitCode == 0 ? StockfishState.disposed : StockfishState.error);
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_instance = null;*/
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}
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}
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