Remove code that requires whole-program compile

lib/src/transformer/transformer.dart

-// Copyright (c) 2016, 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 dev_compiler.src.transformer.transformer;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:barback/barback.dart';
-import 'package:analyzer/src/generated/engine.dart'
-    show AnalysisEngine, AnalysisOptionsImpl;
-import 'package:path/path.dart' as path;
-
-import 'asset_universe.dart';
-import 'error_listener.dart';
-import 'uri_resolver.dart' show assetIdToUri, createSourceFactory;
-import '../compiler.dart';
-import '../options.dart';
-import '../utils.dart';
-import 'package:analyzer/src/generated/engine.dart';
-
-const String _fakeRuntimeDir = "<runtime>";
-
-/// Disclaimer: this transformer is experimental and not optimized. It may run
-/// out of memory for large applications: please use DDC's command-line runner
-/// instead whenever possible.
-class DdcTransformer extends AggregateTransformer {
-  final List<String> _ddcArgs;
-
-  DdcTransformer.asPlugin(BarbackSettings settings)
-      : _ddcArgs = settings.configuration['args'] ?? [];
-
-  @override
-  apply(AggregateTransform transform) async {
-    var inputs = await transform.primaryInputs.toList();
-
-    // The analyzer's source factory mechanism is synchronous, so we can't
-    // have it wait upon transform.getInput. Instead, we build the whole
-    // universe (scanning transitive dependencies and reading their sources),
-    // so as to get a non-async source getter.
-    // Note: This means we use a lot of memory: one way to fix it would be to
-    // propagate asynchonous calls throughout the analyzer.
-    var universe = new AssetUniverse();
-    await Future.wait(
-        inputs.map((a) => universe.scanSources(a.id, transform.getInput)));
-
-    // TODO(ochafik): invesigate the us of createAnalysisContextWithSources
-    // instead.
-    var context = AnalysisEngine.instance.createAnalysisContext();
-    context.analysisOptions = _makeAnalysisOptions();
-    context.sourceFactory = createSourceFactory(universe.getAssetSource);
-
-    // Virtual file system that writes into the transformer's outputs.
-    var fileSystem = new _TransformerFileSystem(
-        transform.logger, transform.package, transform.addOutput,
-        // Seed the runtime files into our file system:
-        inputs: await _readRuntimeFiles(transform.getInput));
-
-    var compiler = new BatchCompiler(
-        context,
-        // Note that the output directory needs not exist, and the runtime
-        // directory is a special value that corresponds to the seeding of
-        // runtimeFiles above.
-        parseOptions([]
-          ..addAll(_ddcArgs)
-          ..addAll([
-            '-o',
-            fileSystem.outputDir.path,
-            '--runtime-dir',
-            _fakeRuntimeDir
-          ])),
-        reporter: new TransformAnalysisErrorListener(transform.logger, context),
-        fileSystem: fileSystem);
-
-    for (var asset in inputs) {
-      compiler.compileFromUriString(assetIdToUri(asset.id));
-    }
-  }
-
-  // TODO(ochafik): Provide more control over these options.
-  AnalysisOptions _makeAnalysisOptions() => new AnalysisOptionsImpl()
-    ..cacheSize = 256 // # of sources to cache ASTs for.
-    ..preserveComments = true
-    ..analyzeFunctionBodies = true
-    ..strongMode = true;
-
-  /// Read the runtime files from the transformer (they're available as
-  /// resources of package:dev_compiler),
-  Future<Map<String, String>> _readRuntimeFiles(
-      Future<Asset> getInput(AssetId id)) async {
-    var runtimeFiles = <String, String>{};
-    for (var file in defaultRuntimeFiles) {
-      var asset =
-          await getInput(new AssetId('dev_compiler', 'lib/runtime/$file'));
-      runtimeFiles[path.join(_fakeRuntimeDir, file)] =
-          await asset.readAsString();
-    }
-    return runtimeFiles;
-  }
-
-  /// We just transform all .dart and .html files in one go.
-  @override
-  classifyPrimary(AssetId id) =>
-      id.extension == '.dart' || id.extension == '.html' ? '<dart>' : null;
-}
-
-/// Type of [Transform.addOutput] and [AggregateTransform.addOutput].
-typedef void AssetOutputAdder(Asset asset);
-
-/// Virtual file system that outputs files into a transformer.
-class _TransformerFileSystem implements FileSystem {
-  final String _package;
-  final Directory outputDir = Directory.current;
-  final String outputPrefix;
-  final AssetOutputAdder _addOutput;
-  final Map<String, String> inputs;
-  final TransformLogger _logger;
-  _TransformerFileSystem(this._logger, this._package, this._addOutput,
-      {this.inputs, this.outputPrefix: 'web/'});
-
-  @override
-  void writeAsStringSync(String file, String contents) {
-    var id = new AssetId(
-        _package, outputPrefix + path.relative(file, from: outputDir.path));
-    _logger.fine('Adding output $id');
-    _addOutput(new Asset.fromString(id, contents));
-  }
-
-  @override
-  void copySync(String src, String dest) {
-    writeAsStringSync(dest, inputs[src] ?? new File(src).readAsStringSync());
-  }
-}