Add AnalysisDriver.getLibraryByUri().

pkg/analyzer/lib/src/dart/analysis/library_context.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/context/declared_variables.dart';
 import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart' show CompilationUnitElement;
+import 'package:analyzer/dart/element/element.dart'
+    show CompilationUnitElement, LibraryElement;
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/dart/analysis/byte_store.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContext, AnalysisEngine, AnalysisOptions;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
@@ skipping 105 matching lines @@
 
       linkedLibraries.forEach((uri, linkedBuilder) {
         FileState library = libraries[uri];
         String key = '${library.transitiveSignature}.linked';
         List<int> bytes = linkedBuilder.toBuffer();
         LinkedLibrary linked = new LinkedLibrary.fromBuffer(bytes);
         store.addLinkedLibrary(uri, linked);
         byteStore.put(key, bytes);
       });
 
-      var analysisContext = _createAnalysisContext(
-          options, declaredVariables, sourceFactory, fsState, store);
+      AnalysisContextImpl analysisContext = _createAnalysisContext(
+          options, declaredVariables, sourceFactory, store);
+      analysisContext.contentCache = new _ContentCacheWrapper(fsState);
 
       return new LibraryContext._(store, analysisContext);
     });
   }
 
   LibraryContext._(this.store, this._analysisContext);
 
   /**
    * Computes a [CompilationUnitElement] for the given library/unit pair.
    */
@@ skipping 17 matching lines @@
    * Computes a resolved [CompilationUnit] and a list of [AnalysisError]s for
    * the given library/unit pair.
    */
   ResolutionResult resolveUnit(Source librarySource, Source unitSource) {
     CompilationUnit resolvedUnit =
         _analysisContext.resolveCompilationUnit2(unitSource, librarySource);
     List<AnalysisError> errors = _analysisContext.computeErrors(unitSource);
     return new ResolutionResult(resolvedUnit, errors);
   }
 
-  static AnalysisContext _createAnalysisContext(
-      AnalysisOptions _analysisOptions,
+  /**
+   * Resynthesize the [LibraryElement] from the given [store].
+   */
+  static LibraryElement resynthesizeLibraryElement(
+      AnalysisOptions analysisOptions,
       DeclaredVariables declaredVariables,
-      SourceFactory _sourceFactory,
-      FileSystemState fileSystemState,
+      SourceFactory sourceFactory,
+      SummaryDataStore store,
+      String uri) {
+    AnalysisContextImpl analysisContext = _createAnalysisContext(
+        analysisOptions, declaredVariables, sourceFactory, store);
+    try {
+      return new StoreBasedSummaryResynthesizer(
+              analysisContext, sourceFactory, analysisOptions.strongMode, store)
+          .getLibraryElement(uri);
+    } finally {
+      analysisContext.dispose();
+    }
+  }
+
+  static AnalysisContextImpl _createAnalysisContext(
+      AnalysisOptions analysisOptions,
+      DeclaredVariables declaredVariables,
+      SourceFactory sourceFactory,
       SummaryDataStore store) {
     AnalysisContextImpl analysisContext =
         AnalysisEngine.instance.createAnalysisContext();
     analysisContext.useSdkCachePartition = false;
-    analysisContext.analysisOptions = _analysisOptions;
+    analysisContext.analysisOptions = analysisOptions;
     analysisContext.declaredVariables.addAll(declaredVariables);
-    analysisContext.sourceFactory = _sourceFactory.clone();
-    analysisContext.contentCache = new _ContentCacheWrapper(fileSystemState);
+    analysisContext.sourceFactory = sourceFactory.clone();
     analysisContext.resultProvider =
         new InputPackagesResultProvider(analysisContext, store);
     return analysisContext;
   }
 }
 
 /**
  * Container object holding the result of a call to
  * [LibraryContext.resolveUnit].
  */
@@ skipping 45 matching lines @@
   @override
   String setContents(Source source, String contents) {
     throw new UnimplementedError();
   }
 
   FileState _getFileForSource(Source source) {
     String path = source.fullName;
     return fsState.getFileForPath(path);
   }
 }