Issue 23640. Implement 'analysis.getNavigation' request.

pkg/analysis_server/lib/src/domain_analysis.dart

 // Copyright (c) 2014, 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.
 
 library domain.analysis;
 
 import 'dart:async';
 import 'dart:core' hide Resource;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_hover.dart';
+import 'package:analysis_server/src/computer/computer_navigation.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/dependencies/library_dependencies.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/engine.dart' as engine;
 
 /**
  * Instances of the class [AnalysisDomainHandler] implement a [RequestHandler]
  * that handles requests in the `analysis` domain.
@@ skipping 76 matching lines @@
       Map<String, Map<String, List<String>>> packageMap =
           collector.calculatePackageMap(server.folderMap);
       server.sendResponse(new AnalysisGetLibraryDependenciesResult(
               libraries.toList(growable: false), packageMap)
           .toResponse(request.id));
     });
     // delay response
     return Response.DELAYED_RESPONSE;
   }
 
+  /**
+   * Implement the `analysis.getNavigation` request.
+   */
+  Response getNavigation(Request request) {
+    var params = new AnalysisGetNavigationParams.fromRequest(request);
+    String file = params.file;
+    int offset = params.offset;
+    Future<AnalysisDoneReason> completionFuture =
+        server.onFileAnalysisComplete(file);
+    if (completionFuture == null) {
+      return new Response.getNavigationInvalidFile(request);
+    }
+    completionFuture.then((AnalysisDoneReason reason) {
+      switch (reason) {
+        case AnalysisDoneReason.COMPLETE:
+          List<CompilationUnit> units =
+              server.getResolvedCompilationUnits(file);
+          if (units.isEmpty) {
+            server.sendResponse(new Response.getNavigationInvalidFile(request));
+          } else {
+            DartUnitNavigationComputer computer =
+                new DartUnitNavigationComputer();
+            for (CompilationUnit unit in units) {
+              AstNode node = new NodeLocator(offset).searchWithin(unit);
+              if (node != null) {
+                computer.compute(node);
+              }
+            }
+            server.sendResponse(new AnalysisGetNavigationResult(
+                    computer.files, computer.targets, computer.regions)
+                .toResponse(request.id));
+          }
+          break;
+        case AnalysisDoneReason.CONTEXT_REMOVED:
+          // The active contexts have changed, so try again.
+          Response response = getNavigation(request);
+          if (response != Response.DELAYED_RESPONSE) {
+            server.sendResponse(response);
+          }
+          break;
+      }
+    });
+    // delay response
+    return Response.DELAYED_RESPONSE;
+  }
+
   @override
   Response handleRequest(Request request) {
     try {
       String requestName = request.method;
       if (requestName == ANALYSIS_GET_ERRORS) {
         return getErrors(request);
       } else if (requestName == ANALYSIS_GET_HOVER) {
         return getHover(request);
       } else if (requestName == ANALYSIS_GET_LIBRARY_DEPENDENCIES) {
         return getLibraryDependencies(request);
+      } else if (requestName == ANALYSIS_GET_NAVIGATION) {
+        return getNavigation(request);
       } else if (requestName == ANALYSIS_REANALYZE) {
         return reanalyze(request);
       } else if (requestName == ANALYSIS_SET_ANALYSIS_ROOTS) {
         return setAnalysisRoots(request);
       } else if (requestName == ANALYSIS_SET_PRIORITY_FILES) {
         return setPriorityFiles(request);
       } else if (requestName == ANALYSIS_SET_SUBSCRIPTIONS) {
         return setSubscriptions(request);
       } else if (requestName == ANALYSIS_UPDATE_CONTENT) {
         return updateContent(request);
@@ skipping 96 matching lines @@
     }
     if (newOptions.generateLints != null) {
       updaters.add((engine.AnalysisOptionsImpl options) {
         options.lint = newOptions.generateLints;
       });
     }
     server.updateOptions(updaters);
     return new AnalysisUpdateOptionsResult().toResponse(request.id);
   }
 }