Forward Kythe requests to plugins and merge in the results

pkg/analysis_server/lib/src/plugin/result_merger.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 'dart:collection';
 
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:analyzer_plugin/protocol/protocol_generated.dart' as plugin;
 import 'package:meta/meta.dart';
@@ skipping 184 matching lines @@
       return partialResultList[0];
     }
     List<HighlightRegion> mergedRegions = <HighlightRegion>[];
     for (List<HighlightRegion> partialResults in partialResultList) {
       mergedRegions.addAll(partialResults);
     }
     return mergedRegions;
   }
 
   /**
+   * Return kythe entry result parameters composed by merging the parameters in
+   * the [partialResultList].
+   *
+   * The resulting list will contain all of the kythe entries from all of the
+   * plugins. If a plugin contributes a kythe entry that is the same as the
+   * entry from a different plugin, the entry will appear twice in the list.
+   */
+  KytheGetKytheEntriesResult mergeKytheEntries(
+      List<KytheGetKytheEntriesResult> partialResultList) {
+    List<KytheEntry> mergedEntries = <KytheEntry>[];
+    Set<String> mergedFiles = new Set<String>();
+    for (KytheGetKytheEntriesResult partialResult in partialResultList) {
+      mergedEntries.addAll(partialResult.entries);
+      mergedFiles.addAll(partialResult.files);
+    }
+    return new KytheGetKytheEntriesResult(mergedEntries, mergedFiles.toList());
+  }
+
+  /**
    * Return navigation notification parameters composed by merging the
    * parameters in the [partialResultList].
    *
    * The resulting list will contain all of the navigation regions from all of
    * the plugins. If a plugin contributes a navigation region that overlaps a
    * region from a previous plugin, the overlapping region will be omitted. (For
    * these purposes, nested regions are considered to be overlapping.)
    */
   AnalysisNavigationParams mergeNavigation(
       List<AnalysisNavigationParams> partialResultList) {
@@ skipping 603 matching lines @@
     if (leftEnd < rightStart || leftStart > rightEnd) {
       return false;
     }
     if (!allowNesting) {
       return true;
     }
     return !((leftStart <= rightStart && rightEnd <= leftEnd) ||
         (rightStart <= leftStart && leftEnd <= rightEnd));
   }
 }