add named constructor, cascade selector suggestions and more tests

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

Index: pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart b/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
index a95f5eaefde3fafe6054ad7725ef962dd99ead54..d0e86dd8995a0e4ab1c1e07e6ed4f3d45c7c4d38 100644
--- a/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
+++ b/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
@@ -5,7 +5,8 @@
 library services.completion.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/protocol_server.dart' hide Element,
+    ElementKind;
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analyzer/src/generated/element.dart';
 
@@ -14,11 +15,9 @@ import 'package:analyzer/src/generated/element.dart';
  * the visible members in that class. Clients should call
  * [ClassElementSuggestionBuilder.suggestionsFor].
  */
-class ClassElementSuggestionBuilder extends GeneralizingElementVisitor {
-  final DartCompletionRequest request;
-  final Set<String> _completions = new Set<String>();
+class ClassElementSuggestionBuilder extends _AbstractSuggestionBuilder {
 
-  ClassElementSuggestionBuilder(this.request);
+  ClassElementSuggestionBuilder(DartCompletionRequest request) : super(request);
 
   @override
   visitClassElement(ClassElement element) {
@@ -35,7 +34,7 @@ class ClassElementSuggestionBuilder extends GeneralizingElementVisitor {
 
   @override
   visitFieldElement(FieldElement element) {
-    _addSuggestion(
+    _addElementSuggestion(
         element,
         CompletionSuggestionKind.GETTER,
         element.type,
@@ -44,7 +43,7 @@ class ClassElementSuggestionBuilder extends GeneralizingElementVisitor {
 
   @override
   visitMethodElement(MethodElement element) {
-    _addSuggestion(
+    _addElementSuggestion(
         element,
         CompletionSuggestionKind.METHOD,
         element.returnType,
@@ -54,13 +53,13 @@ class ClassElementSuggestionBuilder extends GeneralizingElementVisitor {
   @override
   visitPropertyAccessorElement(PropertyAccessorElement element) {
     if (element.isGetter) {
-      _addSuggestion(
+      _addElementSuggestion(
           element,
           CompletionSuggestionKind.GETTER,
           element.returnType,
           element.enclosingElement);
     } else if (element.isSetter) {
-      _addSuggestion(
+      _addElementSuggestion(
           element,
           CompletionSuggestionKind.SETTER,
           element.returnType,
@@ -68,60 +67,12 @@ class ClassElementSuggestionBuilder extends GeneralizingElementVisitor {
     }
   }
 
-  void _addSuggestion(Element element, CompletionSuggestionKind kind,
-      DartType type, ClassElement enclosingElement) {
-    if (element.isSynthetic) {
-      return;
-    }
-    if (element.isPrivate) {
-      LibraryElement elementLibrary =
-          element.getAncestor((parent) => parent is LibraryElement);
-      LibraryElement unitLibrary =
-          request.unit.element.getAncestor((parent) => parent is LibraryElement);
-      if (elementLibrary != unitLibrary) {
-        return;
-      }
-    }
-    String completion = element.displayName;
-    if (completion == null ||
-        completion.length <= 0 ||
-        !_completions.add(completion)) {
-      return;
-    }
-    CompletionSuggestion suggestion = new CompletionSuggestion(
-        kind,
-        CompletionRelevance.DEFAULT,
-        completion,
-        completion.length,
-        0,
-        element.isDeprecated,
-        false);
-    suggestion.element = newElement_fromEngine(element);
-    if (suggestion.element != null) {
-      if (element is FieldElement) {
-        suggestion.element.kind = protocol.ElementKind.GETTER;
-        suggestion.element.returnType =
-            element.type != null ? element.type.displayName : 'dynamic';
-      }
-    }
-    if (enclosingElement != null) {
-      suggestion.declaringType = enclosingElement.displayName;
-    }
-    if (type != null) {
-      String typeName = type.displayName;
-      if (typeName != null && typeName.length > 0 && typeName != 'dynamic') {
-        suggestion.returnType = typeName;
-      }
-    }
-    request.suggestions.add(suggestion);
-  }
-
   /**
    * Add suggestions for the visible members in the given class
    */
   static void suggestionsFor(DartCompletionRequest request, Element element) {
     if (element is ClassElement) {
-      element.accept(new ClassElementSuggestionBuilder(request));
+      return element.accept(new ClassElementSuggestionBuilder(request));
     }
   }
 }
@@ -192,3 +143,98 @@ class LibraryElementSuggestionBuilder extends GeneralizingElementVisitor {
     }
   }
 }
+
+/**
+ * This class visits elements in a class and provides suggestions based upon
+ * the visible named constructors in that class. Clients should call
+ * [NamedConstructorSuggestionBuilder.suggestionsFor].
+ */
+class NamedConstructorSuggestionBuilder extends _AbstractSuggestionBuilder {
+
+  NamedConstructorSuggestionBuilder(DartCompletionRequest request)
+      : super(request);
+
+  @override
+  visitClassElement(ClassElement element) {
+    element.visitChildren(this);
+  }
+
+  @override
+  visitConstructorElement(ConstructorElement element) {
+    _addElementSuggestion(
+        element,
+        CompletionSuggestionKind.CONSTRUCTOR,
+        element.returnType,
+        element.enclosingElement);
+  }
+
+  @override
+  visitElement(Element element) {
+    // ignored
+  }
+
+  /**
+   * Add suggestions for the visible members in the given class
+   */
+  static void suggestionsFor(DartCompletionRequest request, Element element) {
+    if (element is ClassElement) {
+      element.accept(new NamedConstructorSuggestionBuilder(request));
+    }
+  }
+}
+
+/**
+ * Common superclass for sharing behavior
+ */
+class _AbstractSuggestionBuilder extends GeneralizingElementVisitor {
+  final DartCompletionRequest request;
+  final Set<String> _completions = new Set<String>();
+
+  _AbstractSuggestionBuilder(this.request);
+
+  void _addElementSuggestion(Element element, CompletionSuggestionKind kind,
+      DartType type, ClassElement enclosingElement) {
+    if (element.isSynthetic) {
+      return;
+    }
+    if (element.isPrivate) {
+      LibraryElement elementLibrary = element.library;
+      LibraryElement unitLibrary = request.unit.element.library;
+      if (elementLibrary != unitLibrary) {
+        return;
+      }
+    }
+    String completion = element.displayName;
+    if (completion == null ||
+        completion.length <= 0 ||
+        !_completions.add(completion)) {
+      return;
+    }
+    CompletionSuggestion suggestion = new CompletionSuggestion(
+        kind,
+        CompletionRelevance.DEFAULT,
+        completion,
+        completion.length,
+        0,
+        element.isDeprecated,
+        false);
+    suggestion.element = protocol.newElement_fromEngine(element);
+    if (suggestion.element != null) {
+      if (element is FieldElement) {
+        suggestion.element.kind = protocol.ElementKind.GETTER;
+        suggestion.element.returnType =
+            element.type != null ? element.type.displayName : 'dynamic';
+      }
+    }
+    if (enclosingElement != null) {
+      suggestion.declaringType = enclosingElement.displayName;
+    }
+    if (type != null) {
+      String typeName = type.displayName;
+      if (typeName != null && typeName.length > 0 && typeName != 'dynamic') {
+        suggestion.returnType = typeName;
+      }
+    }
+    request.suggestions.add(suggestion);
+  }
+}