Add _embedder.yaml support to analyzer and analysis_server

pkg/analysis_server/test/context_manager_test.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 test.context.directory.manager;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 549 matching lines @@
       callbacks.now++;
       manager.refresh([resourceProvider.getResource(proj2Path)]);
       return pumpEventQueue().then((_) {
         expect(callbacks.currentContextPaths.toList(), unorderedEquals(roots));
         expect(callbacks.currentContextTimestamps[projPath], then);
         expect(callbacks.currentContextTimestamps[proj2Path], callbacks.now);
       });
     });
   }
 
+  test_embedder_packagespec() async {
+    // Create files.
+    String libPath = newFolder([projPath, LIB_NAME]);
+    newFile([libPath, 'main.dart']);
+    newFile([libPath, 'nope.dart']);
+    String sdkExtPath = newFolder([projPath, 'sdk_ext']);
+    newFile([sdkExtPath, 'entry.dart']);
+    String sdkExtSrcPath = newFolder([projPath, 'sdk_ext', 'src']);
+    newFile([sdkExtSrcPath, 'part.dart']);
+    // Setup _embedder.yaml.
+    newFile(
+        [libPath, '_embedder.yaml'],
+        r'''
+embedder_libs:
+  "dart:foobar": "../sdk_ext/entry.dart"
+  "dart:typed_data": "../sdk_ext/src/part"
+  ''');
+    // Setup .packages file
+    newFile(
+        [projPath, '.packages'],
+        r'''
+test_pack:lib/''');
+    // Setup context.
+
+    manager.setRoots(<String>[projPath], <String>[], <String, String>{});
+    await pumpEventQueue();
+    // Confirm that one context was created.
+    var contexts =
+        manager.contextsInAnalysisRoot(resourceProvider.newFolder(projPath));
+    expect(contexts, isNotNull);
+    expect(contexts.length, equals(1));

[pquitslund, 2015/11/11 21:19:34]

[Nit]: can be simplified to:

expect(contexts.length, 1);

[Brian Wilkerson, 2015/11/11 22:09:14]

or, better yet:

expect(contexts, hasLength(1));

+    var context = contexts[0];
+    var source = context.sourceFactory.forUri('dart:foobar');
+    expect(source, isNotNull);
+    expect(source.fullName, equals('/my/proj/sdk_ext/entry.dart'));

[pquitslund, 2015/11/11 21:19:34]

[Nit]: can be simplified to:

expect(source.fullName, '/my/proj/sdk_ext/entry.dart');

+    // We can't find dart:core because we didn't list it in our
+    // embedder_libs map.
+    expect(context.sourceFactory.forUri('dart:core'), isNull);
+    // We can find dart:typed_data because we listed it in our
+    // embedder_libs map.
+    expect(context.sourceFactory.forUri('dart:typed_data'), isNotNull);
+  }
+
   test_sdk_ext_packagespec() async {
     // Create files.
     String libPath = newFolder([projPath, LIB_NAME]);
     newFile([libPath, 'main.dart']);
     newFile([libPath, 'nope.dart']);
     String sdkExtPath = newFolder([projPath, 'sdk_ext']);
     newFile([sdkExtPath, 'entry.dart']);
     String sdkExtSrcPath = newFolder([projPath, 'sdk_ext', 'src']);
     newFile([sdkExtSrcPath, 'part.dart']);
     // Setup sdk extension mapping.
     newFile(
         [libPath, '_sdkext'],
         r'''
 {
   "dart:foobar": "../sdk_ext/entry.dart"
 }
 ''');
     // Setup .packages file
     newFile(
         [projPath, '.packages'],
         r'''
-test_pack:lib/
-''');
+test_pack:lib/''');
     // Setup context.
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     // Confirm that one context was created.
     var contexts =
         manager.contextsInAnalysisRoot(resourceProvider.newFolder(projPath));
     expect(contexts, isNotNull);
     expect(contexts.length, equals(1));
     var context = contexts[0];
     var source = context.sourceFactory.forUri('dart:foobar');
     expect(source.fullName, equals('/my/proj/sdk_ext/entry.dart'));
@@ skipping 1337 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }