flag to limit file and package URI completion suggestions

pkg/analysis_server/lib/src/services/completion/dart/uri_contributor.dart

Index: pkg/analysis_server/lib/src/services/completion/dart/uri_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/uri_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/uri_contributor.dart
index 1cf49b7a2779dc5e48908a593ddd15be2488fa82..59c0f2befbe4e7a63df92ce371e57c4c42c9e9dc 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/uri_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/uri_contributor.dart
@@ -23,6 +23,15 @@ import 'package:path/src/context.dart';
 class UriContributor extends DartCompletionContributor {
   _UriSuggestionBuilder builder;
 
+  /**
+   * A flag indicating whether file: and package: URI suggestions should
+   * be included in the list of completion suggestions.
+   */
+  // TODO(danrubel): remove this flag and related functionality
+  // once the UriContributor limits file: and package: URI suggestions
+  // to only those paths within context roots.
+  static bool suggestFilePaths = true;
+
   @override
   Future<List<CompletionSuggestion>> computeSuggestions(
       DartCompletionRequest request) async {
@@ -95,13 +104,17 @@ class _UriSuggestionBuilder extends SimpleAstVisitor {
       String partialUri = _extractPartialUri(node);
       if (partialUri != null) {
         _addDartSuggestions();
-        _addPackageSuggestions(partialUri);
-        _addFileSuggestions(partialUri);
+        if (UriContributor.suggestFilePaths) {
+          _addPackageSuggestions(partialUri);
+          _addFileSuggestions(partialUri);
+        }
       }
     } else if (parent is PartDirective && parent.uri == node) {
       String partialUri = _extractPartialUri(node);
       if (partialUri != null) {
-        _addFileSuggestions(partialUri);
+        if (UriContributor.suggestFilePaths) {
+          _addFileSuggestions(partialUri);
+        }
       }
     }
   }