Migrate DDC to the new analysis driver.

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

Index: pkg/analyzer/lib/src/dart/analysis/library_context.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/library_context.dart b/pkg/analyzer/lib/src/dart/analysis/library_context.dart
index f14cde27a64211301cc16399f1e389b667f86208..ec706cee77838d92b89f809c92949ebb92fbbad2 100644
--- a/pkg/analyzer/lib/src/dart/analysis/library_context.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/library_context.dart
@@ -4,7 +4,8 @@
 
 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';
@@ -19,7 +20,8 @@ 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
@@ -47,11 +49,16 @@ class LibraryContext {
       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);
       }
@@ -59,6 +66,7 @@ class LibraryContext {
       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;
           }
@@ -161,6 +169,31 @@ class LibraryContext {
     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,
@@ -214,6 +247,9 @@ class _ContentCacheWrapper implements ContentCache {
     if (source.isInSystemLibrary) {
       return true;
     }
+    if (fileTracker.externalSummaries.hasUnlinkedUnit(source.uri.toString())) {
+      return true;
+    }
     return _getFileForSource(source).exists;
   }