Use declared variables to select the correct configuration for resolution

pkg/analyzer/lib/src/dart/ast/utilities.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 analyzer.src.dart.ast.utilities;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/exception/exception.dart';
+import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisEngine;
 import 'package:analyzer/src/generated/utilities_collection.dart' show TokenMap;
 import 'package:analyzer/src/generated/utilities_dart.dart';
 
 /**
  * An AST visitor that will clone any AST structure that it visits. The cloner
  * will only clone the structure, it will not preserve any resolution results or
  * properties associated with the nodes.
  */
@@ skipping 343 matching lines @@
           cloneNode(node.documentationComment),
           cloneNodeList(node.metadata),
           cloneToken(node.enumKeyword),
           cloneNode(node.name),
           cloneToken(node.leftBracket),
           cloneNodeList(node.constants),
           cloneToken(node.rightBracket));
 
   @override
   ExportDirective visitExportDirective(ExportDirective node) {
-    ExportDirective directive = new ExportDirective(
+    ExportDirectiveImpl directive = new ExportDirective(
         cloneNode(node.documentationComment),
         cloneNodeList(node.metadata),
         cloneToken(node.keyword),
         cloneNode(node.uri),
         cloneNodeList(node.configurations),
         cloneNodeList(node.combinators),
         cloneToken(node.semicolon));
-    directive.source = node.source;
+    directive.selectedSource = node.selectedSource;
+    directive.uriSource = node.uriSource;
     directive.uriContent = node.uriContent;
     return directive;
   }
 
   @override
   ExpressionFunctionBody visitExpressionFunctionBody(
           ExpressionFunctionBody node) =>
       new ExpressionFunctionBody(
           cloneToken(node.keyword),
           cloneToken(node.functionDefinition),
@@ skipping 142 matching lines @@
       cloneToken(node.elseKeyword),
       cloneNode(node.elseStatement));
 
   @override
   ImplementsClause visitImplementsClause(ImplementsClause node) =>
       new ImplementsClause(
           cloneToken(node.implementsKeyword), cloneNodeList(node.interfaces));
 
   @override
   ImportDirective visitImportDirective(ImportDirective node) {
-    ImportDirective directive = new ImportDirective(
+    ImportDirectiveImpl directive = new ImportDirective(
         cloneNode(node.documentationComment),
         cloneNodeList(node.metadata),
         cloneToken(node.keyword),
         cloneNode(node.uri),
         cloneNodeList(node.configurations),
         cloneToken(node.deferredKeyword),
         cloneToken(node.asKeyword),
         cloneNode(node.prefix),
         cloneNodeList(node.combinators),
         cloneToken(node.semicolon));
-    directive.source = node.source;
+    directive.selectedSource = node.selectedSource;
+    directive.uriSource = node.uriSource;
     directive.uriContent = node.uriContent;
     return directive;
   }
 
   @override
   IndexExpression visitIndexExpression(IndexExpression node) {
     Token period = node.period;
     if (period == null) {
       return new IndexExpression.forTarget(
           cloneNode(node.target),
@@ skipping 127 matching lines @@
           cloneNode(node.expression), cloneToken(node.rightParenthesis));
 
   @override
   PartDirective visitPartDirective(PartDirective node) {
     PartDirective directive = new PartDirective(
         cloneNode(node.documentationComment),
         cloneNodeList(node.metadata),
         cloneToken(node.partKeyword),
         cloneNode(node.uri),
         cloneToken(node.semicolon));
-    directive.source = node.source;
+    directive.uriSource = node.uriSource;
     directive.uriContent = node.uriContent;
     return directive;
   }
 
   @override
   PartOfDirective visitPartOfDirective(PartOfDirective node) =>
       new PartOfDirective(
           cloneNode(node.documentationComment),
           cloneNodeList(node.metadata),
           cloneToken(node.partKeyword),
@@ skipping 7106 matching lines @@
    * Safely visit the given [token], printing the [suffix] after the token if it
    * is non-`null`.
    */
   void _visitTokenWithSuffix(Token token, String suffix) {
     if (token != null) {
       _buffer.write(token.lexeme);
       _buffer.write(suffix);
     }
   }
 }