Add support for external summaries bundle in AnalysisDriver.

pkg/analyzer/lib/src/summary/package_bundle_reader.dart

 import 'dart:io' as io;
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/resynthesize.dart';
 import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:front_end/src/base/source.dart';
 
 /**
+ * A [ConflictingSummaryException] indicates that two different summaries
+ * provided to a [SummaryDataStore] conflict.
+ */
+class ConflictingSummaryException implements Exception {
+  final String duplicatedUri;
+  final String summary1Uri;
+  final String summary2Uri;
+  String _message;
+
+  ConflictingSummaryException(Iterable<String> summaryPaths, this.duplicatedUri,
+      this.summary1Uri, this.summary2Uri) {
+    // Paths are often quite long.  Find and extract out a common prefix to
+    // build a more readable error message.
+    var prefix = _commonPrefix(summaryPaths.toList());
+    _message = '''
+These summaries conflict because they overlap:
+- ${summary1Uri.substring(prefix)}
+- ${summary2Uri.substring(prefix)}
+Both contain the file: ${duplicatedUri}.
+This typically indicates an invalid build rule where two or more targets
+include the same source.
+  ''';
+  }
+
+  String toString() => _message;
+
+  /// Given a set of file paths, find a common prefix.
+  int _commonPrefix(List<String> strings) {
+    if (strings.isEmpty) return 0;
+    var first = strings.first;
+    int common = first.length;
+    for (int i = 1; i < strings.length; ++i) {
+      var current = strings[i];
+      common = min(common, current.length);
+      for (int j = 0; j < common; ++j) {
+        if (first[j] != current[j]) {
+          common = j;
+          if (common == 0) return 0;
+          break;
+        }
+      }
+    }
+    // The prefix should end with a file separator.
+    var last =
+        first.substring(0, common).lastIndexOf(io.Platform.pathSeparator);
+    return last < 0 ? 0 : last + 1;
+  }
+}
+
+/**
  * The [ResultProvider] that provides results from input package summaries.
  */
 class InputPackagesResultProvider extends ResynthesizerResultProvider {
   InputPackagesResultProvider(
       InternalAnalysisContext context, SummaryDataStore dataStore)
       : super(context, dataStore) {
     createResynthesizer();
     context.typeProvider = resynthesizer.typeProvider;
   }
 
@@ skipping 266 matching lines @@
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     LinkedLibrary linkedLibrary = _dataStore.linkedMap[uri];
     return linkedLibrary != null;
   }
 }
 
 /**
- * A [ConflictingSummaryException] indicates that two different summaries
- * provided to a [SummaryDataStore] conflict.
- */
-class ConflictingSummaryException implements Exception {
-  final String duplicatedUri;
-  final String summary1Uri;
-  final String summary2Uri;
-  String _message;
-
-  ConflictingSummaryException(Iterable<String> summaryPaths, this.duplicatedUri,
-      this.summary1Uri, this.summary2Uri) {
-    // Paths are often quite long.  Find and extract out a common prefix to
-    // build a more readable error message.
-    var prefix = _commonPrefix(summaryPaths.toList());
-    _message = '''
-These summaries conflict because they overlap:
-- ${summary1Uri.substring(prefix)}
-- ${summary2Uri.substring(prefix)}
-Both contain the file: ${duplicatedUri}.
-This typically indicates an invalid build rule where two or more targets
-include the same source.
-  ''';
-  }
-
-  /// Given a set of file paths, find a common prefix.
-  int _commonPrefix(List<String> strings) {
-    if (strings.isEmpty) return 0;
-    var first = strings.first;
-    int common = first.length;
-    for (int i = 1; i < strings.length; ++i) {
-      var current = strings[i];
-      common = min(common, current.length);
-      for (int j = 0; j < common; ++j) {
-        if (first[j] != current[j]) {
-          common = j;
-          if (common == 0) return 0;
-          break;
-        }
-      }
-    }
-    // The prefix should end with a file separator.
-    var last =
-        first.substring(0, common).lastIndexOf(io.Platform.pathSeparator);
-    return last < 0 ? 0 : last + 1;
-  }
-
-  String toString() => _message;
-}
-
-/**
  * A [SummaryDataStore] is a container for the data extracted from a set of
  * summary package bundles.  It contains maps which can be used to find linked
  * and unlinked summaries by URI.
  */
 class SummaryDataStore {
   /**
    * List of all [PackageBundle]s.
    */
   final List<PackageBundle> bundles = <PackageBundle>[];
 
@@ skipping 95 matching lines @@
   }
 
   /**
    * Add the given [linkedLibrary] with the given [uri].
    */
   void addLinkedLibrary(String uri, LinkedLibrary linkedLibrary) {
     linkedMap[uri] = linkedLibrary;
   }
 
   /**
+   * Add into this store the unlinked units and linked libraries of [other].
+   */
+  void addStore(SummaryDataStore other) {
+    unlinkedMap.addAll(other.unlinkedMap);
+    linkedMap.addAll(other.linkedMap);
+  }
+
+  /**
    * Add the given [unlinkedUnit] with the given [uri].
    */
   void addUnlinkedUnit(String uri, UnlinkedUnit unlinkedUnit) {
     unlinkedMap[uri] = unlinkedUnit;
   }
 
   /**
    * Return a list of absolute URIs of the libraries that contain the unit with
    * the given [unitUriString], or `null` if no such library is in the store.
    */
@@ skipping 11 matching lines @@
         String partAbsoluteUriString =
             resolveRelativeUri(libraryUri, partUri).toString();
         if (partAbsoluteUriString == unitUriString) {
           libraryUriStrings.add(unlinkedUnitUriString);
         }
       }
     });
     return libraryUriStrings.isNotEmpty ? libraryUriStrings : null;
   }
 
+  /**
+   * Return `true` if the store contains the unlinked summary for the unit
+   * with the given absolute [uri].
+   */
+  bool hasUnlinkedUnit(String uri) {
+    return unlinkedMap.containsKey(uri);
+  }
+
   void _fillMaps(String path, ResourceProvider resourceProvider) {
     List<int> buffer;
     if (resourceProvider != null) {
       var file = resourceProvider.getFile(path);
       buffer = file.readAsBytesSync();
     } else {
       io.File file = new io.File(path);
       buffer = file.readAsBytesSync();
     }
     PackageBundle bundle = new PackageBundle.fromBuffer(buffer);
     addBundle(path, bundle);
   }
 }