Create a new AstFactory class to be used by analyzer and its clients.

pkg/analyzer/lib/src/dart/ast/ast.dart

Index: pkg/analyzer/lib/src/dart/ast/ast.dart
diff --git a/pkg/analyzer/lib/src/dart/ast/ast.dart b/pkg/analyzer/lib/src/dart/ast/ast.dart
index 4d388d218c492ab67c070c3d67224a5976100891..3c53a7bd518a5704a036c5747ade04c32984f71d 100644
--- a/pkg/analyzer/lib/src/dart/ast/ast.dart
+++ b/pkg/analyzer/lib/src/dart/ast/ast.dart
@@ -7,6 +7,7 @@ library analyzer.src.dart.ast.ast;
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/comment_type.dart';
 import 'package:analyzer/dart/ast/syntactic_entity.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ -22,6 +23,9 @@ import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source.dart' show LineInfo, Source;
 import 'package:analyzer/src/generated/utilities_dart.dart';
 
+export 'package:analyzer/dart/ast/comment_type.dart' show CommentType;
+export 'package:analyzer/src/dart/ast/uri_validation_code.dart' show UriValidationCodeImpl;
+
 /**
  * Two or more string literals that are implicitly concatenated because of being
  * adjacent (separated only by whitespace).
@@ -2336,39 +2340,6 @@ class CommentReferenceImpl extends AstNodeImpl implements CommentReference {
 }
 
 /**
- * The possible types of comments that are recognized by the parser.
- */
-class CommentType {
-  /**
-   * A block comment.
-   */
-  static const CommentType BLOCK = const CommentType('BLOCK');
-
-  /**
-   * A documentation comment.
-   */
-  static const CommentType DOCUMENTATION = const CommentType('DOCUMENTATION');
-
-  /**
-   * An end-of-line comment.
-   */
-  static const CommentType END_OF_LINE = const CommentType('END_OF_LINE');
-
-  /**
-   * The name of the comment type.
-   */
-  final String name;
-
-  /**
-   * Initialize a newly created comment type to have the given [name].
-   */
-  const CommentType(this.name);
-
-  @override
-  String toString() => name;
-}
-
-/**
  * A compilation unit.
  *
  * While the grammar restricts the order of the directives and declarations
@@ -10708,33 +10679,6 @@ abstract class UriBasedDirectiveImpl extends DirectiveImpl
 }
 
 /**
- * Validation codes returned by [UriBasedDirective.validate].
- */
-class UriValidationCodeImpl implements UriValidationCode {
-  static const UriValidationCode INVALID_URI =
-      const UriValidationCodeImpl('INVALID_URI');
-
-  static const UriValidationCode URI_WITH_INTERPOLATION =
-      const UriValidationCodeImpl('URI_WITH_INTERPOLATION');
-
-  static const UriValidationCode URI_WITH_DART_EXT_SCHEME =
-      const UriValidationCodeImpl('URI_WITH_DART_EXT_SCHEME');
-
-  /**
-   * The name of the validation code.
-   */
-  final String name;
-
-  /**
-   * Initialize a newly created validation code to have the given [name].
-   */
-  const UriValidationCodeImpl(this.name);
-
-  @override
-  String toString() => name;
-}
-
-/**
  * An identifier that has an initial value associated with it. Instances of this
  * class are always children of the class [VariableDeclarationList].
  *