Initial implementation of copy/paste support

pkg/analysis_server/lib/src/computer/import_elements_computer.dart

+// Copyright (c) 2017, 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.
+
+import 'package:analysis_server/protocol/protocol_generated.dart';
+import 'package:analyzer/dart/analysis/results.dart';
+import 'package:analyzer/dart/analysis/session.dart';
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
+import 'package:analyzer_plugin/utilities/change_builder/change_builder_dart.dart';
+
+/**
+ * An object used to compute the edits required to ensure that a list of
+ * elements is imported into a given library.
+ */
+class ImportElementsComputer {
+  /**
+   * The analysis session used to compute the unit.
+   */
+  final AnalysisSession session;
+
+  /**
+   * The library element representing the library to which the imports are to be
+   * added.
+   */
+  final LibraryElement libraryElement;
+
+  /**
+   * The path of the defining compilation unit of the library.
+   */
+  final String path;
+
+  /**
+   * The elements that are to be imported into the library.
+   */
+  final List<ImportedElements> elements;
+
+  /**
+   * Initialize a newly created computer to compute the edits required to ensure
+   * that the given list of [elements] is imported into a given [library].
+   */
+  ImportElementsComputer(ResolveResult result, this.path, this.elements)
+      : session = result.session,
+        libraryElement = result.libraryElement;
+
+  /**
+   * Compute and return the list of edits.
+   */
+  List<SourceEdit> compute() {
+    DartChangeBuilder builder = new DartChangeBuilder(session);
+    builder.addFileEdit(path, (DartFileEditBuilder builder) {});

[devoncarew, 2017/07/05 20:54:59]

This is the stub implementation? Perhaps provide a TODO:?

[Brian Wilkerson, 2017/07/05 21:01:50]

Done

+    return <SourceEdit>[]; // builder.sourceChange
+  }
+}