pkg/_fe_analyzer_shared/lib/src/parser/experimental_features.dart

// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import '../experiments/flags.dart';
import '../scanner/abstract_scanner.dart' show ScannerConfiguration;

/// Interface for determining which features are enabled during parsing.
abstract class ExperimentalFeatures {
  bool isExperimentEnabled(ExperimentalFlag flag);
}

/// Implementation of [ExperimentalFeatures] that uses the enables the
/// experiments currently enabled by default.
///
/// This should only be used for testing. For actual parsing, the enabled
/// features should be determined by language version and enabled experiments.
class DefaultExperimentalFeatures implements ExperimentalFeatures {
  const DefaultExperimentalFeatures();

  @override
  bool isExperimentEnabled(ExperimentalFlag flag) => flag.isEnabledByDefault;
}

extension ExperimentalFeaturesExtension on ExperimentalFeatures {
  ScannerConfiguration buildScannerConfiguration() {
    return new ScannerConfiguration(
      enableTripleShift: isExperimentEnabled(ExperimentalFlag.tripleShift),
      enableAugmentations: isExperimentEnabled(ExperimentalFlag.augmentations),
    );
  }
}