improve keyword suggestions when completing partial keyword

pkg/analysis_server/lib/src/services/completion/keyword_computer.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 services.completion.computer.dart.keyword;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
@@ skipping 44 matching lines @@
   visitCompilationUnit(CompilationUnit node) {
     Directive firstDirective;
     int endOfDirectives = 0;
     if (node.directives.length > 0) {
       firstDirective = node.directives[0];
       endOfDirectives = node.directives.last.end - 1;
     }
     int startOfDeclarations = node.end;
     if (node.declarations.length > 0) {
       startOfDeclarations = node.declarations[0].offset;
+      // If the first token is a simple identifier
+      // and cursor position in within that first token
+      // then consider cursor to be before the first declaration
+      Token token = node.declarations[0].firstTokenAfterCommentAndMetadata;
+      if (token.offset <= request.offset && request.offset <= token.end) {
+        startOfDeclarations = token.end;
+      }
     }
 
     // Simplistic check for library as first directive
     if (firstDirective is! LibraryDirective) {
       if (firstDirective != null) {
         if (request.offset <= firstDirective.offset) {
           _addSuggestions([Keyword.LIBRARY]);
         }
       } else {
         if (request.offset <= startOfDeclarations) {
@@ skipping 21 matching lines @@
     if (request.offset == node.end) {
       Token token = node.endToken;
       if (token != null && !token.isSynthetic) {
         if (token.lexeme == ';' || token.lexeme == '}') {
           node.parent.accept(this);
         }
       }
     }
   }
 
+  visitSimpleIdentifier(SimpleIdentifier node) {
+    AstNode parent =
+        node.getAncestor((n) => n is TopLevelVariableDeclaration);
+    if (parent is TopLevelVariableDeclaration) {
+      if (parent.variables != null && parent.variables.type != null
+          && parent.variables.type.name == node) {
+        AstNode unit = node.getAncestor((n) => n is CompilationUnit);
+        if (unit is CompilationUnit) {
+          visitCompilationUnit(unit);
+        }
+      }
+    }
+  }
+
   void _addSuggestion(Keyword keyword) {
     String completion = keyword.syntax;
     request.suggestions.add(
         new CompletionSuggestion(
             CompletionSuggestionKind.KEYWORD,
             CompletionRelevance.DEFAULT,
             completion,
             completion.length,
             0,
             false,
             false));
   }
 
   void _addSuggestions(List<Keyword> keywords) {
     keywords.forEach((Keyword keyword) {
       _addSuggestion(keyword);
     });
   }
 }