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barback/lib/src/graph/transformer_classifier.dart

Index: barback/lib/src/graph/transformer_classifier.dart
diff --git a/barback/lib/src/graph/transformer_classifier.dart b/barback/lib/src/graph/transformer_classifier.dart
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--- a/barback/lib/src/graph/transformer_classifier.dart
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-// 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.graph.transformer_classifier;
-
-import 'dart:async';
-
-import '../asset/asset_forwarder.dart';
-import '../asset/asset_node.dart';
-import '../errors.dart';
-import '../log.dart';
-import '../transformer/aggregate_transformer.dart';
-import '../transformer/wrapping_aggregate_transformer.dart';
-import '../utils.dart';
-import 'node_status.dart';
-import 'node_streams.dart';
-import 'phase.dart';
-import 'transform_node.dart';
-
-/// A class for classifying the primary inputs for a transformer according to
-/// its [AggregateTransformer.classifyPrimary] method.
-///
-/// This is also used for non-aggregate transformers; they're modeled as
-/// aggregate transformers that return the primary path if `isPrimary` is true
-/// and `null` if `isPrimary` is `null`.
-class TransformerClassifier {
-  /// The containing [Phase].
-  final Phase phase;
-
-  /// The [AggregateTransformer] used to classify the inputs.
-  final AggregateTransformer transformer;
-
-  /// A string describing the location of [this] in the transformer graph.
-  final String _location;
-
-  /// The individual transforms for each classiciation key.
-  final _transforms = new Map<Object, TransformNode>();
-
-  /// Forwarders used to pass through assets that aren't used by [transformer].
-  final _passThroughForwarders = new Set<AssetForwarder>();
-
-  /// The streams exposed by this classifier.
-  final _streams = new NodeStreams();
-  Stream get onStatusChange => _streams.onStatusChange;
-  Stream<AssetNode> get onAsset => _streams.onAsset;
-  Stream<LogEntry> get onLog => _streams.onLog;
-
-  /// A broadcast stream that emits an event whenever [this] has finished
-  /// classifying all available inputs.
-  Stream get onDoneClassifying => _onDoneClassifyingController.stream;
-  final _onDoneClassifyingController =
-      new StreamController.broadcast(sync: true);
-
-  /// The number of currently-active calls to [transformer.classifyPrimary].
-  ///
-  /// This is used to determine whether [this] is dirty.
-  var _activeClassifications = 0;
-
-  /// Whether this is currently classifying any inputs.
-  bool get isClassifying => _activeClassifications > 0;
-
-  /// How far along [this] is in processing its assets.
-  NodeStatus get status {
-    if (isClassifying) return NodeStatus.RUNNING;
-    return NodeStatus.dirtiest(
-        _transforms.values.map((transform) => transform.status));
-  }
-
-  TransformerClassifier(this.phase, transformer, this._location)
-      : transformer = transformer is AggregateTransformer ?
-            transformer : new WrappingAggregateTransformer(transformer);
-
-  /// Adds a new asset as an input for this transformer.
-  void addInput(AssetNode input) {
-    _activeClassifications++;
-    syncFuture(() => transformer.classifyPrimary(input.id)).catchError(
-        (error, stackTrace) {
-      if (input.state.isRemoved) return null;
-
-      // Catch all transformer errors and pipe them to the results stream. This
-      // is so a broken transformer doesn't take down the whole graph.
-      var info = new TransformInfo(transformer, input.id);
-      if (error is! AssetNotFoundException) {
-        error = new TransformerException(info, error, stackTrace);
-      } else {
-        error = new MissingInputException(info, error.id);
-      }
-      phase.cascade.reportError(error);
-
-      return null;
-    }).then((key) {
-      if (input.state.isRemoved) return;
-      if (key == null) {
-        var forwarder = new AssetForwarder(input);
-        _passThroughForwarders.add(forwarder);
-        forwarder.node.whenRemoved(
-            () => _passThroughForwarders.remove(forwarder));
-        _streams.onAssetController.add(forwarder.node);
-      } else if (_transforms.containsKey(key)) {
-        _transforms[key].addPrimary(input);
-      } else {
-        var transform = new TransformNode(this, transformer, key, _location);
-        _transforms[key] = transform;
-
-        transform.onStatusChange.listen(
-            (_) => _streams.changeStatus(status),
-            onDone: () {
-          _transforms.remove(transform.key);
-          if (!_streams.isClosed) _streams.changeStatus(status);
-        });
-
-        _streams.onAssetPool.add(transform.onAsset);
-        _streams.onLogPool.add(transform.onLog);
-        transform.addPrimary(input);
-      }
-    }).whenComplete(() {
-      _activeClassifications--;
-      if (_streams.isClosed) return;
-      if (!isClassifying) _onDoneClassifyingController.add(null);
-      _streams.changeStatus(status);
-    });
-  }
-
-  /// Removes this transformer.
-  ///
-  /// This marks all outputs of the transformer as removed.
-  void remove() {
-    _streams.close();
-    _onDoneClassifyingController.close();
-    for (var transform in _transforms.values.toList()) {
-      transform.remove();
-    }
-    for (var forwarder in _passThroughForwarders.toList()) {
-      forwarder.close();
-    }
-  }
-
-  /// Force all deferred transforms to begin producing concrete assets.
-  void forceAllTransforms() {
-    for (var transform in _transforms.values) {
-      transform.force();
-    }
-  }
-
-  String toString() => "classifier in $_location for $transformer";
-}