Convert DartChangeBuilder to use AnalysisSession

pkg/analyzer_plugin/lib/src/utilities/change_builder/change_builder_dart.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 'dart:async';
 
+import 'package:analyzer/dart/analysis/results.dart';
+import 'package:analyzer/dart/analysis/session.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/src/dart/analysis/driver.dart';
+import 'package:analyzer/exception/exception.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart'
     hide Element, ElementKind;
 import 'package:analyzer_plugin/src/utilities/change_builder/change_builder_core.dart';
 import 'package:analyzer_plugin/src/utilities/string_utilities.dart';
 import 'package:analyzer_plugin/utilities/change_builder/change_builder_core.dart';
 import 'package:analyzer_plugin/utilities/change_builder/change_builder_dart.dart';
 import 'package:analyzer_plugin/utilities/range_factory.dart';
 import 'package:charcode/ascii.dart';
 import 'package:path/path.dart' as path;
 
 /**
  * A [ChangeBuilder] used to build changes in Dart files.
  */
 class DartChangeBuilderImpl extends ChangeBuilderImpl
     implements DartChangeBuilder {
   /**
    * The analysis driver in which the files being edited were analyzed.

[scheglov, 2017/07/02 16:59:44]

driver -> session?

[Brian Wilkerson, 2017/07/03 15:41:22]

Done

    */
-  final AnalysisDriver driver;
+  final AnalysisSession session;
 
   /**
    * Initialize a newly created change builder.
    */
-  DartChangeBuilderImpl(this.driver);
+  DartChangeBuilderImpl(this.session);
 
   @override
   Future<Null> addFileEdit(
           String path, void buildFileEdit(DartFileEditBuilder builder)) =>
       super.addFileEdit(path, buildFileEdit);
 
   @override
   Future<DartFileEditBuilderImpl> createFileEditBuilder(String path) async {
-    AnalysisResult result = await driver.getResult(path);
-    int timeStamp = driver.fsState.getFileForPath(path).exists ? 0 : -1;
+    ResolveResult result = await session.getResolvedAst(path);
+    ResultState state = result.state;
+    if (state == ResultState.INVALID_FILE_TYPE) {
+      throw new AnalysisException('Cannot analyze "$path"');
+    }
+    int timeStamp = state == ResultState.VALID ? 0 : -1;
     return new DartFileEditBuilderImpl(this, path, timeStamp, result.unit);
   }
 }
 
 /**
  * An [EditBuilder] used to build edits in Dart files.
  */
 class DartEditBuilderImpl extends EditBuilderImpl implements DartEditBuilder {
   List<String> _KNOWN_METHOD_NAME_PREFIXES = ['get', 'is', 'to'];
 
@@ skipping 1326 matching lines @@
   }
 }
 
 class _InsertionDescription {
   final int offset;
   final bool insertEmptyLineBefore;
   final bool insertEmptyLineAfter;
   _InsertionDescription(
       this.offset, this.insertEmptyLineBefore, this.insertEmptyLineAfter);
 }