Reorganize barback's source files.

pkg/barback/lib/src/transform.dart

Index: pkg/barback/lib/src/transform.dart
diff --git a/pkg/barback/lib/src/transform.dart b/pkg/barback/lib/src/transform.dart
deleted file mode 100644
index 268849d78a419d2faa567df217ffc3560e948854..0000000000000000000000000000000000000000
--- a/pkg/barback/lib/src/transform.dart
+++ /dev/null
@@ -1,119 +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.transform;
-
-import 'dart:async';
-import 'dart:convert';
-
-import 'asset.dart';
-import 'asset_id.dart';
-import 'asset_set.dart';
-import 'base_transform.dart';
-import 'errors.dart';
-import 'transform_node.dart';
-import 'utils.dart';
-
-/// While a [Transformer] represents a *kind* of transformation, this defines
-/// one specific usage of it on a set of files.
-///
-/// This ephemeral object exists only during an actual transform application to
-/// facilitate communication between the [Transformer] and the code hosting
-/// the transformation. It lets the [Transformer] access inputs and generate
-/// outputs.
-class Transform extends BaseTransform {
-  final TransformNode _node;
-
-  final _outputs = new AssetSet();
-
-  /// Gets the primary input asset.
-  ///
-  /// While a transformation can use multiple input assets, one must be a
-  /// special "primary" asset. This will be the "entrypoint" or "main" input
-  /// file for a transformation.
-  ///
-  /// For example, with a dart2js transform, the primary input would be the
-  /// entrypoint Dart file. All of the other Dart files that that imports
-  /// would be secondary inputs.
-  ///
-  /// This method may fail at runtime with an [AssetNotFoundException] if called
-  /// asynchronously after the transform begins running. The primary input may
-  /// become unavailable while this transformer is running due to asset changes
-  /// earlier in the graph. You can ignore the error if this happens: the
-  /// transformer will be re-run automatically for you.
-  Asset get primaryInput {
-    if (!_node.primary.state.isAvailable) {
-      throw new AssetNotFoundException(_node.primary.id);
-    }
-
-    return _node.primary.asset;
-  }
-
-  Transform._(TransformNode node)
-    : _node = node,
-      super(node);
-
-  /// Gets the asset for an input [id].
-  ///
-  /// If an input with [id] cannot be found, throws an [AssetNotFoundException].
-  Future<Asset> getInput(AssetId id) {
-    if (id == _node.primary.id) return syncFuture(() => primaryInput);
-    return _node.getInput(id);
-  }
-
-  /// A convenience method to the contents of the input with [id] as a string.
-  ///
-  /// This is equivalent to calling [getInput] followed by [Asset.readAsString].
-  ///
-  /// If the asset was created from a [String] the original string is always
-  /// returned and [encoding] is ignored. Otherwise, the binary data of the
-  /// asset is decoded using [encoding], which defaults to [UTF8].
-  ///
-  /// If an input with [id] cannot be found, throws an [AssetNotFoundException].
-  Future<String> readInputAsString(AssetId id, {Encoding encoding}) {
-    if (encoding == null) encoding = UTF8;
-    return getInput(id).then((input) => input.readAsString(encoding: encoding));
-  }
-
-  /// A convenience method to the contents of the input with [id].
-  ///
-  /// This is equivalent to calling [getInput] followed by [Asset.read].
-  ///
-  /// If the asset was created from a [String], this returns its UTF-8 encoding.
-  ///
-  /// If an input with [id] cannot be found, throws an [AssetNotFoundException].
-  Stream<List<int>> readInput(AssetId id) =>
-      futureStream(getInput(id).then((input) => input.read()));
-
-  /// A convenience method to return whether or not an asset exists.
-  ///
-  /// This is equivalent to calling [getInput] and catching an
-  /// [AssetNotFoundException].
-  Future<bool> hasInput(AssetId id) {
-    return getInput(id).then((_) => true).catchError((error) {
-      if (error is AssetNotFoundException && error.id == id) return false;
-      throw error;
-    });
-  }
-
-  /// Stores [output] as the output created by this transformation.
-  ///
-  /// A transformation can output as many assets as it wants.
-  void addOutput(Asset output) {
-    // TODO(rnystrom): This should immediately throw if an output with that ID
-    // has already been created by this transformer.
-    _outputs.add(output);
-  }
-}
-
-/// The controller for [Transform].
-class TransformController extends BaseTransformController {
-  Transform get transform => super.transform;
-
-  /// The set of assets that the transformer has emitted.
-  AssetSet get outputs => transform._outputs;
-
-  TransformController(TransformNode node)
-      : super(new Transform._(node));
-}