Default arg support continued (flutter-intellij#553).

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

 // Copyright (c) 2015, 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 services.completion.dart.suggestion.builder;
 
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analysis_server/src/protocol_server.dart'
     hide Element, ElementKind;
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
+import 'package:analysis_server/src/services/completion/dart/utilities.dart';
 import 'package:analysis_server/src/utilities/documentation.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/dart/element/visitor.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:path/path.dart' as path;
 
 const String DYNAMIC = 'dynamic';
 
@@ skipping 42 matching lines @@
   if (element is ExecutableElement && element is! PropertyAccessorElement) {
     suggestion.parameterNames = element.parameters
         .map((ParameterElement parameter) => parameter.name)
         .toList();
     suggestion.parameterTypes =
         element.parameters.map((ParameterElement parameter) {
       DartType paramType = parameter.type;
       // Gracefully degrade if type not resolved yet
       return paramType != null ? paramType.displayName : 'var';
     }).toList();
-    suggestion.requiredParameterCount = element.parameters
-        .where((ParameterElement parameter) =>
-            parameter.parameterKind == ParameterKind.REQUIRED)
-        .length;
-    suggestion.hasNamedParameters = element.parameters.any(
-        (ParameterElement parameter) =>
-            parameter.parameterKind == ParameterKind.NAMED);
+
+    Iterable<ParameterElement> requiredParameters = element.parameters.where(
+        (ParameterElement param) =>
+            param.parameterKind == ParameterKind.REQUIRED);
+    suggestion.requiredParameterCount = requiredParameters.length;
+
+    Iterable<ParameterElement> namedParameters = element.parameters.where(
+        (ParameterElement param) => param.parameterKind == ParameterKind.NAMED);
+    suggestion.hasNamedParameters = namedParameters.isNotEmpty;
+
+    suggestion.defaultArgumentListString =
+        buildDefaultArgList(requiredParameters, namedParameters);
   }
   if (importForSource != null) {
     String srcPath = path.dirname(importForSource.fullName);
     LibraryElement libElem = element.library;
     if (libElem != null) {
       Source libSource = libElem.source;
       if (libSource != null) {
         UriKind uriKind = libSource.uriKind;
         if (uriKind == UriKind.DART_URI) {
           suggestion.importUri = libSource.uri.toString();
@@ skipping 187 matching lines @@
   @override
   visitTopLevelVariableElement(TopLevelVariableElement element) {
     if (!typesOnly) {
       int relevance = element.library == containingLibrary
           ? DART_RELEVANCE_LOCAL_TOP_LEVEL_VARIABLE
           : DART_RELEVANCE_DEFAULT;
       addSuggestion(element, relevance: relevance);
     }
   }
 }