Remove barback from the repo.

pkg/barback/lib/src/transformer/base_transform.dart

Index: pkg/barback/lib/src/transformer/base_transform.dart
diff --git a/pkg/barback/lib/src/transformer/base_transform.dart b/pkg/barback/lib/src/transformer/base_transform.dart
deleted file mode 100644
index fe3ab3b6cdd3cf0708a66cc5cef89dbb9a49948b..0000000000000000000000000000000000000000
--- a/pkg/barback/lib/src/transformer/base_transform.dart
+++ /dev/null
@@ -1,115 +0,0 @@
-// Copyright (c) 2014, 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.
-
-library barback.transformer.base_transform;
-
-import 'dart:async';
-
-import '../asset/asset_id.dart';
-import '../graph/transform_node.dart';
-import '../log.dart';
-import 'transform_logger.dart';
-
-/// The base class for the ephemeral transform objects that are passed to
-/// transformers.
-///
-/// This class provides the transformers with inputs, but its up to the
-/// subclasses to provide a means of emitting outputs.
-abstract class BaseTransform {
-  final TransformNode _node;
-
-  /// The ids of primary inputs that should be consumed.
-  ///
-  /// This is exposed by [BaseTransformController].
-  final _consumedPrimaries = new Set<AssetId>();
-
-  /// Whether the transformer logged an error.
-  ///
-  /// This is exposed via [BaseTransformController].
-  bool _loggedError = false;
-
-  /// The controller for the stream of log entries emitted by the transformer.
-  ///
-  /// This is exposed via [BaseTransformController].
-  ///
-  /// This is synchronous because error logs can cause the transform to fail, so
-  /// we need to ensure that their processing isn't delayed until after the
-  /// transform or build has finished.
-  final _onLogController = new StreamController<LogEntry>.broadcast(sync: true);
-
-  /// A logger so that the [Transformer] can report build details.
-  TransformLogger get logger => _logger;
-  TransformLogger _logger;
-
-  BaseTransform(this._node) {
-    _logger = new TransformLogger((asset, level, message, span) {
-      if (level == LogLevel.ERROR) _loggedError = true;
-
-      // If the log isn't already associated with an asset, use the primary.
-      if (asset == null) asset = _node.info.primaryId;
-      var entry = new LogEntry(_node.info, asset, level, message, span);
-
-      // The log controller can be closed while log entries are still coming in
-      // if the transformer is removed during [apply].
-      if (!_onLogController.isClosed) _onLogController.add(entry);
-    });
-  }
-
-  /// Consume a primary input so that it doesn't get processed by future
-  /// phases or emitted once processing has finished.
-  ///
-  /// Normally each primary input will automatically be forwarded unless the
-  /// transformer overwrites it by emitting an input with the same id. This
-  /// allows the transformer to tell barback not to forward a primary input
-  /// even if it's not overwritten.
-  void consumePrimary(AssetId id) {
-    // TODO(nweiz): throw an error if an id is consumed that wasn't listed as a
-    // primary input.
-    _consumedPrimaries.add(id);
-  }
-}
-
-/// The base class for controllers of subclasses of [BaseTransform].
-///
-/// Controllers are used so that [TransformNode]s can get values from a
-/// [BaseTransform] without exposing getters in the public API.
-abstract class BaseTransformController {
-  /// The [BaseTransform] controlled by this controller.
-  final BaseTransform transform;
-
-  /// The ids of primary inputs that should be consumed.
-  Set<AssetId> get consumedPrimaries => transform._consumedPrimaries;
-
-  /// Whether the transform logged an error.
-  bool get loggedError => transform._loggedError;
-
-  /// The stream of log entries emitted by the transformer during a run.
-  Stream<LogEntry> get onLog => transform._onLogController.stream;
-
-  /// Whether the transform's input or id stream has been closed.
-  ///
-  /// See also [done].
-  bool get isDone;
-
-  BaseTransformController(this.transform);
-
-  /// Mark this transform as finished emitting new inputs or input ids.
-  ///
-  /// This is distinct from [cancel] in that it *doesn't* indicate that the
-  /// transform is finished being used entirely. The transformer may still log
-  /// messages and load secondary inputs. This just indicates that all the
-  /// primary inputs are accounted for.
-  void done();
-
-  /// Mark this transform as canceled.
-  ///
-  /// This will close any streams and release any resources that were allocated
-  /// for the duration of the transformation. Unlike [done], this indicates that
-  /// the transformation is no longer relevant; either it has returned, or
-  /// something external has preemptively invalidated its results.
-  void cancel() {
-    done();
-    transform._onLogController.close();
-  }
-}