Generalize DartSdkManager to support embedder SDKs

pkg/analysis_server/lib/src/context_manager.dart

 // 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 context.directory.manager;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:core' hide Resource;
@@ skipping 1139 matching lines @@
    * given [disposition].
    */
   SourceFactory _createSourceFactory(InternalAnalysisContext context,
       AnalysisOptions options, FolderDisposition disposition, Folder folder) {
     List<UriResolver> resolvers = [];
     List<UriResolver> packageUriResolvers =
         disposition.createPackageUriResolvers(resourceProvider);
 
     EmbedderYamlLocator locator =
         disposition.getEmbedderLocator(resourceProvider);
-    EmbedderSdk sdk = new EmbedderSdk(locator.embedderYamls);
-    if (sdk.libraryMap.size() == 0) {
-      // The embedder uri resolver has no mappings. Use the default Dart SDK
-      // uri resolver.
+    Map<Folder, YamlMap> embedderYamls = locator.embedderYamls;
+    EmbedderSdk embedderSdk = new EmbedderSdk(embedderYamls);
+    if (embedderSdk.libraryMap.size() == 0) {
+      // There was no embedder file, or the file was empty, so used the default
+      // SDK.
       resolvers.add(new DartUriResolver(sdkManager.getSdkForOptions(options)));
     } else {
-      // The embedder uri resolver has mappings, use it instead of the default
-      // Dart SDK uri resolver.
-      resolvers.add(new DartUriResolver(sdk));
+      // The embedder file defines an alternate SDK, so use it.
+      List<String> paths = <String>[];
+      for (Folder folder in embedderYamls.keys) {
+        paths.add(folder
+            .getChildAssumingFile(EmbedderYamlLocator.EMBEDDER_FILE_NAME)
+            .path);
+      }
+      DartSdk dartSdk =
+          sdkManager.getSdk(new SdkDescription(paths, options), () {
+        embedderSdk.analysisOptions = options;
+        // TODO(brianwilkerson) Enable summary use after we have decided where
+        // summary files for embedder files will live.
+        embedderSdk.useSummary = false;
+        return embedderSdk;
+      });
+      resolvers.add(new DartUriResolver(dartSdk));
     }
 
     resolvers.addAll(packageUriResolvers);
     resolvers.add(new ResourceUriResolver(resourceProvider));
     return new SourceFactory(resolvers, disposition.packages);
   }
 
   /**
    * Clean up and destroy the context associated with the given folder.
    */
@@ skipping 673 matching lines @@
 
   @override
   EmbedderYamlLocator getEmbedderLocator(ResourceProvider resourceProvider) {
     if (_embedderLocator == null) {
       _embedderLocator =
           new EmbedderYamlLocator(buildPackageMap(resourceProvider));
     }
     return _embedderLocator;
   }
 }