Compute covering offsets/lengths.

pkg/analysis_server/lib/src/services/refactoring/refactoring.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.refactoring;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart'
     show RefactoringMethodParameter, SourceChange;
@@ skipping 54 matching lines @@
   /**
    * Returns a new [ExtractLocalRefactoring] instance.
    */
   factory ExtractLocalRefactoring(
       CompilationUnit unit, int selectionOffset, int selectionLength) {
     return new ExtractLocalRefactoringImpl(
         unit, selectionOffset, selectionLength);
   }
 
   /**
+   * The lengths of the expressions that cover the specified selection,
+   * from the down most to the up most.
+   */
+  List<int> get coveringExpressionLengths;
+
+  /**
+   * The offsets of the expressions that cover the specified selection,
+   * from the down most to the up most.
+   */
+  List<int> get coveringExpressionOffsets;
+
+  /**
    * True if all occurrences of the expression within the scope in which the
    * variable will be defined should be replaced by a reference to the local
    * variable. The expression used to initiate the refactoring will always be
    * replaced.
    */
   void set extractAll(bool extractAll);
 
   /**
    * The lengths of the expressions that would be replaced by a reference to the
    * variable. The lengths correspond to the offsets. In other words, for a
@@ skipping 321 matching lines @@
    * Validates that the [newName] is a valid identifier and is appropriate for
    * the type of the [Element] being renamed.
    *
    * It does not perform all the checks (such as checking for conflicts with any
    * existing names in any of the scopes containing the current name), as many
    * of these checkes require search engine. Use [checkFinalConditions] for this
    * level of checking.
    */
   RefactoringStatus checkNewName();
 }