Migrate DDC to the new analysis driver.

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/dart/analysis/file_tracker.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';
 import 'package:analyzer/src/summary/link.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:analyzer/src/task/dart.dart' show COMPILATION_UNIT_ELEMENT;
-import 'package:analyzer/task/dart.dart' show LibrarySpecificUnit;
+import 'package:analyzer/task/dart.dart'
+    show LIBRARY_ELEMENT, LibrarySpecificUnit;
 
 /**
  * Context information necessary to analyze one or more libraries within an
  * [AnalysisDriver].
  *
  * Currently this is implemented as a wrapper around [AnalysisContext].
  * TODO(paulberry): make a front end API that this can make use of instead.
  */
 class LibraryContext {
   final SummaryDataStore store;
 
   /**
    * The [AnalysisContext] which is used to do the analysis.
    */
   final AnalysisContext _analysisContext;
 
   /**
    * Create a [LibraryContext] which is prepared to analyze [targetLibrary].
    */
   factory LibraryContext.forSingleLibrary(
       FileState targetLibrary,
       PerformanceLog logger,
       PackageBundle sdkBundle,
       ByteStore byteStore,
       AnalysisOptions options,
       DeclaredVariables declaredVariables,
       SourceFactory sourceFactory,
+      SummaryDataStore externalSummaries,
       FileTracker fileTracker) {
     return logger.run('Create library context', () {
       Map<String, FileState> libraries = <String, FileState>{};
       SummaryDataStore store = new SummaryDataStore(const <String>[]);
 
+      if (externalSummaries != null) {
+        store.addStore(externalSummaries);
+      }
+
       if (sdkBundle != null) {
         store.addBundle(null, sdkBundle);
       }
 
       void appendLibraryFiles(FileState library) {
         if (!libraries.containsKey(library.uriStr)) {
           // Serve 'dart:' URIs from the SDK bundle.
+          // TODO(scheglov) Repeal and replace with the external store.
           if (sdkBundle != null && library.uri.scheme == 'dart') {
             return;
           }
 
           libraries[library.uriStr] = library;
 
           // Append the defining unit.
           store.addUnlinkedUnit(library.uriStr, library.unlinked);
 
           // Append parts.
@@ skipping 82 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);
   }
 
+  /**
+   * TODO(scheglov) document
+   */
+  static LibraryElement resynthesizeLibrary(
+      AnalysisOptions analysisOptions,
+      DeclaredVariables declaredVariables,
+      SourceFactory sourceFactory,
+      SummaryDataStore store,
+      String uri) {
+    AnalysisContextImpl analysisContext =
+        AnalysisEngine.instance.createAnalysisContext();
+    analysisContext.useSdkCachePartition = false;
+    analysisContext.analysisOptions = analysisOptions;
+    analysisContext.declaredVariables.addAll(declaredVariables);
+    analysisContext.sourceFactory = sourceFactory.clone();
+    var provider = new InputPackagesResultProvider(analysisContext, store);
+    var source = sourceFactory.resolveUri(null, uri);
+    var entry = analysisContext.getCacheEntry(source);
+    bool success = provider.compute(entry, LIBRARY_ELEMENT);
+    if (!success) {
+      throw new StateError('Expected successful resynthesis of $source');
+    }
+    return entry.getValue(LIBRARY_ELEMENT);
+  }
+
   static AnalysisContext _createAnalysisContext(
       AnalysisOptions _analysisOptions,
       DeclaredVariables declaredVariables,
       SourceFactory _sourceFactory,
       FileTracker fileTracker,
       SummaryDataStore store) {
     AnalysisContextImpl analysisContext =
         AnalysisEngine.instance.createAnalysisContext();
     analysisContext.useSdkCachePartition = false;
     analysisContext.analysisOptions = _analysisOptions;
@@ skipping 33 matching lines @@
   @override
   String getContents(Source source) {
     return _getFileForSource(source).content;
   }
 
   @override
   bool getExists(Source source) {
     if (source.isInSystemLibrary) {
       return true;
     }
+    if (fileTracker.externalSummaries.hasUnlinkedUnit(source.uri.toString())) {
+      return true;
+    }
     return _getFileForSource(source).exists;
   }
 
   @override
   int getModificationStamp(Source source) {
     if (source.isInSystemLibrary) {
       return 0;
     }
     return _getFileForSource(source).exists ? 0 : -1;
   }
 
   @override
   String setContents(Source source, String contents) {
     throw new UnimplementedError();
   }
 
   FileState _getFileForSource(Source source) {
     String path = source.fullName;
     return fileTracker.fsState.getFileForPath(path);
   }
 }