Initial implementation of the kythe domain

pkg/analysis_server/lib/src/domain_kythe.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:async';
+import 'dart:core';
+
+import 'package:analysis_server/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_constants.dart';
+import 'package:analysis_server/protocol/protocol_generated.dart';
+import 'package:analysis_server/src/analysis_server.dart';
+import 'package:analysis_server/src/services/kythe/kythe_visitors.dart';
+import 'package:analyzer/src/dart/analysis/driver.dart';
+import 'package:analyzer/src/dart/resolver/inheritance_manager.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
+
+/**
+ * Instances of the class [KytheDomainHandler] implement a [RequestHandler]
+ * that handles requests in the `kythe` domain.
+ */
+class KytheDomainHandler implements RequestHandler {
+  /**
+   * The analysis server that is using this handler to process requests.
+   */
+  final AnalysisServer server;
+
+  /**
+   * Initialize a newly created handler to handle requests for the given [server].
+   */
+  KytheDomainHandler(this.server);
+
+  /**
+   * Implement the `kythe.getKytheEntries` request.
+   */
+  Future<Null> getKytheEntries(Request request) async {
+    String file = new KytheGetKytheEntriesParams.fromRequest(request).file;
+    AnalysisResult result = await server.getAnalysisResult(file);
+    List<KytheEntry> entries = <KytheEntry>[];
+    // TODO(brianwilkerson) Figure out how to get the list of files.
+    List<String> files = <String>[];
+    result.unit.accept(new KytheDartVisitor([] /*entries*/, file,
+        new InheritanceManager(result.libraryElement), result.content));
+    server.sendResponse(
+        new KytheGetKytheEntriesResult(entries, files).toResponse(request.id));
+  }
+
+  @override
+  Response handleRequest(Request request) {
+    try {
+      String requestName = request.method;
+      if (requestName == KYTHE_REQUEST_GET_KYTHE_ENTRIES) {
+        getKytheEntries(request);
+        return Response.DELAYED_RESPONSE;
+      }
+    } on RequestFailure catch (exception) {
+      return exception.response;
+    }
+    return null;
+  }
+}