Tolerate SDKs that do not include dart:async (issue 25520)

pkg/analyzer/test/src/context/mock_sdk.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 analyzer.test.src.context.mock_sdk;
 
 import 'package:analyzer/file_system/file_system.dart' as resource;
 import 'package:analyzer/file_system/memory_file_system.dart' as resource;
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisEngine, ChangeSet;
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 
+const _MockSdkLibrary _LIB_ASYNC = const _MockSdkLibrary(
+    'dart:async',
+    '/lib/async/async.dart',
+    '''
+library dart.async;
+
+import 'dart:math';
+
+part 'stream.dart';
+
+class Future<T> {
+  factory Future(computation()) => null;
+  factory Future.delayed(Duration duration, [T computation()]) => null;
+  factory Future.value([T value]) => null;
+
+  static Future<List/*<T>*/> wait/*<T>*/(
+      Iterable<Future/*<T>*/> futures) => null;
+  Future/*<R>*/ then/*<R>*/(/*=R*/ onValue(T value)) => null;
+}
+''',
+    const <String, String>{
+      '/lib/async/stream.dart': r'''
+part of dart.async;
+class Stream<T> {}
+abstract class StreamTransformer<S, T> {}
+'''
+    });
+
+const _MockSdkLibrary _LIB_COLLECTION = const _MockSdkLibrary(
+    'dart:collection',
+    '/lib/collection/collection.dart',
+    '''
+library dart.collection;
+
+abstract class HashMap<K, V> implements Map<K, V> {}
+''');
+
+const _MockSdkLibrary _LIB_CONVERT = const _MockSdkLibrary(
+    'dart:convert',
+    '/lib/convert/convert.dart',
+    '''
+library dart.convert;
+
+import 'dart:async';
+
+abstract class Converter<S, T> implements StreamTransformer {}
+class JsonDecoder extends Converter<String, Object> {}
+''');
+
 const _MockSdkLibrary _LIB_CORE = const _MockSdkLibrary(
     'dart:core',
     '/lib/core/core.dart',
     '''
 library dart.core;
 
 import 'dart:async';
 
 class Object {
   bool operator ==(other) => identical(this, other);
@@ skipping 84 matching lines @@
 external bool identical(Object a, Object b);
 
 void print(Object object) {}
 
 class _Override {
   const _Override();
 }
 const Object override = const _Override();
 ''');
 
-const _MockSdkLibrary _LIB_ASYNC = const _MockSdkLibrary(
-    'dart:async',
-    '/lib/async/async.dart',
-    '''
-library dart.async;
-
-import 'dart:math';
-
-part 'stream.dart';
-
-class Future<T> {
-  factory Future(computation()) => null;
-  factory Future.delayed(Duration duration, [T computation()]) => null;
-  factory Future.value([T value]) => null;
-
-  static Future<List/*<T>*/> wait/*<T>*/(
-      Iterable<Future/*<T>*/> futures) => null;
-  Future/*<R>*/ then/*<R>*/(/*=R*/ onValue(T value)) => null;
-}
-''',
-    const <String, String>{
-      '/lib/async/stream.dart': r'''
-part of dart.async;
-class Stream<T> {}
-abstract class StreamTransformer<S, T> {}
-'''
-    });
-
-const _MockSdkLibrary _LIB_COLLECTION = const _MockSdkLibrary(
-    'dart:collection',
-    '/lib/collection/collection.dart',
-    '''
-library dart.collection;
-
-abstract class HashMap<K, V> implements Map<K, V> {}
-''');
-
-const _MockSdkLibrary _LIB_CONVERT = const _MockSdkLibrary(
-    'dart:convert',
-    '/lib/convert/convert.dart',
-    '''
-library dart.convert;
-
-import 'dart:async';
-
-abstract class Converter<S, T> implements StreamTransformer {}
-class JsonDecoder extends Converter<String, Object> {}
-''');
-
 const _MockSdkLibrary _LIB_FOREIGN_HELPER = const _MockSdkLibrary(
     'dart:_foreign_helper',
     '/lib/_foreign_helper/_foreign_helper.dart',
     '''
 library dart._foreign_helper;
 
 JS(String typeDescription, String codeTemplate,
   [arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10, arg11])
 {}
 ''');
 
+const _MockSdkLibrary _LIB_HTML = const _MockSdkLibrary(
+    'dart:html',
+    '/lib/html/dartium/html_dartium.dart',
+    '''
+library dart.html;
+class HtmlElement {}
+''');
+
 const _MockSdkLibrary _LIB_MATH = const _MockSdkLibrary(
     'dart:math',
     '/lib/math/math.dart',
     '''
 library dart.math;
 
 const double E = 2.718281828459045;
 const double PI = 3.1415926535897932;
 const double LN10 =  2.302585092994046;
 
 num/*=T*/ min/*<T extends num>*/(num/*=T*/ a, num/*=T*/ b) => null;
 num/*=T*/ max/*<T extends num>*/(num/*=T*/ a, num/*=T*/ b) => null;
 
 external double cos(num x);
 external double sin(num x);
 external double sqrt(num x);
 class Random {
   bool nextBool() => true;
   double nextDouble() => 2.0;
   int nextInt() => 1;
 }
 ''');
 
-const _MockSdkLibrary _LIB_HTML = const _MockSdkLibrary(
-    'dart:html',
-    '/lib/html/dartium/html_dartium.dart',
-    '''
-library dart.html;
-class HtmlElement {}
-''');
-
 const List<SdkLibrary> _LIBRARIES = const [
   _LIB_CORE,
   _LIB_ASYNC,
   _LIB_COLLECTION,
   _LIB_CONVERT,
   _LIB_FOREIGN_HELPER,
   _LIB_MATH,
   _LIB_HTML,
 ];
 
 class MockSdk implements DartSdk {
+  static const Map<String, String> FULL_URI_MAP = const {
+    "dart:core": "/lib/core/core.dart",
+    "dart:html": "/lib/html/dartium/html_dartium.dart",
+    "dart:async": "/lib/async/async.dart",
+    "dart:async/stream.dart": "/lib/async/stream.dart",
+    "dart:collection": "/lib/collection/collection.dart",
+    "dart:convert": "/lib/convert/convert.dart",
+    "dart:_foreign_helper": "/lib/_foreign_helper/_foreign_helper.dart",
+    "dart:math": "/lib/math/math.dart"
+  };
+
+  static const Map<String, String> NO_ASYNC_URI_MAP = const {
+    "dart:core": "/lib/core/core.dart",
+  };
+
   final resource.MemoryResourceProvider provider =
       new resource.MemoryResourceProvider();
 
+  final Map<String, String> uriMap;
+
   /**
    * The [AnalysisContextImpl] which is used for all of the sources.
    */
   AnalysisContextImpl _analysisContext;
 
+  @override
+  final List<SdkLibrary> sdkLibraries;
+
   MockSdk({bool dartAsync: true})
-      : sdkLibraries = dartAsync ? _LIBRARIES : [_LIB_CORE] {
+      : sdkLibraries = dartAsync ? _LIBRARIES : [_LIB_CORE],
+        uriMap = dartAsync ? FULL_URI_MAP : NO_ASYNC_URI_MAP {
     for (_MockSdkLibrary library in sdkLibraries) {
       provider.newFile(library.path, library.content);
       library.parts.forEach((String path, String content) {
         provider.newFile(path, content);
       });
     }
   }
 
   @override
   AnalysisContextImpl get context {
     if (_analysisContext == null) {
       _analysisContext = new _SdkAnalysisContext(this);
       SourceFactory factory = new SourceFactory([new DartUriResolver(this)]);
       _analysisContext.sourceFactory = factory;
     }
     return _analysisContext;
   }
 
   @override
-  final List<SdkLibrary> sdkLibraries;
-
-  @override
   String get sdkVersion => throw new UnimplementedError();
 
   @override
   List<String> get uris =>
       sdkLibraries.map((SdkLibrary library) => library.shortName).toList();
 
   @override
   Source fromFileUri(Uri uri) {
     String filePath = uri.path;
     String libPath = '/lib';
@@ skipping 29 matching lines @@
   @override
   SdkLibrary getSdkLibrary(String dartUri) {
     // getSdkLibrary() is only used to determine whether a library is internal
     // to the SDK.  The mock SDK doesn't have any internals, so it's safe to
     // return null.
     return null;
   }
 
   @override
   Source mapDartUri(String dartUri) {
-    const Map<String, String> uriToPath = const {
-      "dart:core": "/lib/core/core.dart",
-      "dart:html": "/lib/html/dartium/html_dartium.dart",
-      "dart:async": "/lib/async/async.dart",
-      "dart:async/stream.dart": "/lib/async/stream.dart",
-      "dart:collection": "/lib/collection/collection.dart",
-      "dart:convert": "/lib/convert/convert.dart",
-      "dart:_foreign_helper": "/lib/_foreign_helper/_foreign_helper.dart",
-      "dart:math": "/lib/math/math.dart"
-    };
-
-    String path = uriToPath[dartUri];
+    String path = uriMap[dartUri];
     if (path != null) {
       resource.File file = provider.getResource(path);
       Uri uri = new Uri(scheme: 'dart', path: dartUri.substring(5));
       return file.createSource(uri);
     }
 
     // If we reach here then we tried to use a dartUri that's not in the
     // table above.
     return null;
   }
@@ skipping 40 matching lines @@
 
   @override
   AnalysisCache createCacheFromSourceFactory(SourceFactory factory) {
     if (factory == null) {
       return super.createCacheFromSourceFactory(factory);
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }