Renames to move closer to the new API

pkg/analysis_server/lib/completion/completion_dart.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 analysis_server.completion.completion_dart;
 
 import 'package:analysis_server/completion/completion_core.dart';
+import 'package:analysis_server/src/services/completion/completion_dart.dart';
 import 'package:analyzer/src/generated/ast.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/source.dart';
 
 /**
  * An object used to produce completions for a specific error within a Dart
  * file. Completion contributors are long-lived objects and must not retain any
  * state between invocations of [computeSuggestions].
  *
  * Clients are expected to subtype this class when implementing plugins.
  */
 abstract class DartCompletionContributor extends CompletionContributor {
   @override
   CompletionResult computeSuggestions(CompletionRequest request) {
-    // TODO(brianwilkerson) Implement this by getting the information required
-    // to create a DartCompletionRequest and calling:
-    // return internalComputeSuggestions(dartRequest);
-    return null;
+    if (request is DartCompletionRequest) {
+      return internalComputeSuggestions(request);
+    }
+    AnalysisContext context = request.context;
+    Source source = request.source;
+    List<Source> libraries = context.getLibrariesContaining(source);
+    if (libraries.length < 1) {
+      return null;
+    }
+    CompilationUnit unit =
+        context.getResolvedCompilationUnit2(source, libraries[0]);
+    bool isResolved = true;
+    if (unit == null) {
+      // TODO(brianwilkerson) Implement a method for getting a parsed
+      // compilation unit without parsing the unit if it hasn't been parsed.
+//      unit = context.getParsedCompilationUnit(source);
+      if (unit == null) {
+        return null;
+      }
+      isResolved = false;
+    }
+    DartCompletionRequest dartRequest =
+        new DartCompletionRequestImpl(request, unit, isResolved);
+    return internalComputeSuggestions(dartRequest);
   }
 
   /**
    * Compute a list of completion suggestions based on the given completion
    * [request] and return a result that includes those suggestions. This method
    * is called after specific phases of analysis until the contributor indicates
    * computation is complete by setting [CompletionResult.isLast] to `true`.
    */
   CompletionResult internalComputeSuggestions(DartCompletionRequest request);
 }
 
 /**
  * The information about a requested list of completions within a Dart file.
  */
 abstract class DartCompletionRequest extends CompletionRequest {
   /**
    * Return `true` if the compilation [unit] is resolved.
    */
   bool get isResolved;
 
   /**
-   * The compilation unit in which the completion was requested.
+   * Return the compilation unit in which the completion was requested.
    */
   CompilationUnit get unit;
 
   /**
    * Cached information from a prior code completion operation.
    */
   //DartCompletionCache get cache;
 
   /**
-   * The completion target.  This determines what part of the parse tree
+   * Return the completion target.  This determines what part of the parse tree
    * will receive the newly inserted text.
    */
   //CompletionTarget get target;
 
   /**
    * Information about the types of suggestions that should be included.
    */
   //OpType get _optype;
 }