Implement modular compilation

lib/src/analyzer/dart_sdk.dart

 // Copyright (c) 2015, 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.
 
 /// Common logic needed to provide a Dart SDK to the analyzer's resolver. This
 /// includes logic to determine where the sdk is located in the filesystem, and
 /// definitions to provide mock sdks.
 
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContext, AnalysisEngine, TimestampedData;
 import 'package:analyzer/src/generated/sdk.dart'
     show DartSdk, SdkLibrary, SdkLibraryImpl;
 import 'package:analyzer/src/generated/source.dart'
     show DartUriResolver, Source, SourceFactory, UriKind;
 import 'package:analyzer/src/context/context.dart' show AnalysisContextImpl;
 import 'package:analyzer/src/context/cache.dart'
     show AnalysisCache, CachePartition;
 
 /// Dart SDK which contains a mock implementation of the SDK libraries. May be
 /// used to speed up execution when most of the core libraries is not needed.
+//
+// TODO(jmesserly): replace this with Analyzer's mock SDK, or use summaries
+// to load the real SDK.
 class MockDartSdk implements DartSdk {
   final Map<Uri, _MockSdkSource> _sources = {};
   final bool reportMissing;
   final Map<String, SdkLibrary> _libs = {};
   final String sdkVersion = '0';
   List<String> get uris => _sources.keys.map((uri) => '$uri').toList();
+
   AnalysisContext context;
   DartUriResolver _resolver;
   DartUriResolver get resolver => _resolver;
 
   MockDartSdk(Map<String, String> sources, {this.reportMissing}) {
     context = new _SdkAnalysisContext(this);
     sources.forEach((uriString, contents) {
       var uri = Uri.parse(uriString);
       _sources[uri] = new _MockSdkSource(uri, contents);
       _libs[uriString] = new SdkLibraryImpl(uri.path)
@@ skipping 157 matching lines @@
 
   @override
   AnalysisCache createCacheFromSourceFactory(SourceFactory factory) {
     if (factory == null) {
       return super.createCacheFromSourceFactory(factory);
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }