Start pulling pub from its own repo.

sdk/lib/_internal/pub/lib/src/barback/transformer_loader.dart

Index: sdk/lib/_internal/pub/lib/src/barback/transformer_loader.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/transformer_loader.dart b/sdk/lib/_internal/pub/lib/src/barback/transformer_loader.dart
deleted file mode 100644
index 031c384cd005b551ee4e0bee5380a3e22da603ab..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/barback/transformer_loader.dart
+++ /dev/null
@@ -1,127 +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 pub.barback.transformer_loader;
-
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-
-import '../log.dart' as log;
-import '../utils.dart';
-import 'asset_environment.dart';
-import 'barback_server.dart';
-import 'dart2js_transformer.dart';
-import 'excluding_transformer.dart';
-import 'transformer_config.dart';
-import 'transformer_id.dart';
-import 'transformer_isolate.dart';
-
-/// A class that loads transformers defined in specific files.
-class TransformerLoader {
-  final AssetEnvironment _environment;
-
-  final BarbackServer _transformerServer;
-
-  final _isolates = new Map<TransformerId, TransformerIsolate>();
-
-  final _transformers = new Map<TransformerConfig, Set<Transformer>>();
-
-  /// The packages that use each transformer id.
-  ///
-  /// Used for error reporting.
-  final _transformerUsers = new Map<TransformerId, Set<String>>();
-
-  TransformerLoader(this._environment, this._transformerServer) {
-    for (var package in _environment.graph.packages.values) {
-      for (var config in unionAll(package.pubspec.transformers)) {
-        _transformerUsers.putIfAbsent(config.id, () => new Set<String>())
-            .add(package.name);
-      }
-    }
-  }
-
-  /// Loads a transformer plugin isolate that imports the transformer libraries
-  /// indicated by [ids].
-  ///
-  /// Once the returned future completes, transformer instances from this
-  /// isolate can be created using [transformersFor] or [transformersForPhase].
-  ///
-  /// This skips any ids that have already been loaded.
-  Future load(Iterable<TransformerId> ids, {String snapshot}) async {
-    ids = ids.where((id) => !_isolates.containsKey(id)).toList();
-    if (ids.isEmpty) return;
-
-    var isolate = await log.progress("Loading ${toSentence(ids)} transformers",
-        () => TransformerIsolate.spawn(_environment, _transformerServer, ids,
-                  snapshot: snapshot));
-
-    for (var id in ids) {
-      _isolates[id] = isolate;
-    }
-  }
-
-  /// Instantiates and returns all transformers in the library indicated by
-  /// [config] with the given configuration.
-  ///
-  /// If this is called before the library has been loaded into an isolate via
-  /// [load], it will return an empty set.
-  Future<Set<Transformer>> transformersFor(TransformerConfig config) async {
-    if (_transformers.containsKey(config)) return _transformers[config];
-
-    if (_isolates.containsKey(config.id)) {
-      var transformers = await _isolates[config.id].create(config);
-      if (transformers.isNotEmpty) {
-        _transformers[config] = transformers;
-        return transformers;
-      }
-
-      var message = "No transformers";
-      if (config.configuration.isNotEmpty) {
-        message += " that accept configuration";
-      }
-
-      var location;
-      if (config.id.path == null) {
-        location = 'package:${config.id.package}/transformer.dart or '
-          'package:${config.id.package}/${config.id.package}.dart';
-      } else {
-        location = 'package:$config.dart';
-      }
-
-      var users = toSentence(ordered(_transformerUsers[config.id]));
-      fail("$message were defined in $location,\n"
-          "required by $users.");
-    } else if (config.id.package != '\$dart2js') {
-      return new Future.value(new Set());
-    }
-
-    var transformer;
-    try {
-      transformer = new Dart2JSTransformer.withSettings(_environment,
-          new BarbackSettings(config.configuration, _environment.mode));
-    } on FormatException catch (error, stackTrace) {
-      fail(error.message, error, stackTrace);
-    }
-
-    // Handle any exclusions.
-    _transformers[config] = new Set.from(
-        [ExcludingTransformer.wrap(transformer, config)]);
-    return _transformers[config];
-  }
-
-  /// Loads all transformers defined in each phase of [phases].
-  ///
-  /// If any library hasn't yet been loaded via [load], it will be ignored.
-  Future<List<Set<Transformer>>> transformersForPhases(
-      Iterable<Set<TransformerConfig>> phases) async {
-    var result = await Future.wait(phases.map((phase) async {
-      var transformers = await waitAndPrintErrors(phase.map(transformersFor));
-      return unionAll(transformers);
-    }));
-
-    // Return a growable list so that callers can add phases.
-    return result.toList();
-  }
-}