integrating fasta parser

pkg/analyzer/lib/src/generated/parser.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.parser;
+
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
 import 'package:analyzer/src/error/codes.dart';
+import 'package:analyzer/src/fasta/ast_builder.dart';
+import 'package:analyzer/src/fasta/element_store.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisEngine;
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
+import 'package:front_end/src/fasta/kernel/kernel_builder.dart';
+import 'package:front_end/src/fasta/kernel/kernel_library_builder.dart';
+import 'package:front_end/src/fasta/parser/parser.dart' as fasta;
 
 export 'package:analyzer/src/dart/ast/utilities.dart' show ResolutionCopier;
 export 'package:analyzer/src/dart/error/syntactic_errors.dart';
 
+part 'parser_fasta.dart';
+
 /**
  * A simple data-holder for a method that needs to return multiple values.
  */
 class CommentAndMetadata {
   /**
    * The documentation comment that was parsed, or `null` if none was given.
    */
   final Comment comment;
 
   /**
@@ skipping 216 matching lines @@
   @deprecated
   bool parseGenericMethods = false;
 
   /**
    * A flag indicating whether to parse generic method comments, of the form
    * `/*=T*/` and `/*<T>*/`.
    */
   bool parseGenericMethodComments = false;
 
   /**
+   * A flag indicating whether the analyzer [Parser] factory method
+   * will return a fasta based parser or an analyzer based parser.
+   */
+  static bool useFasta = const bool.fromEnvironment("useFastaParser");
+
+  /**
    * Initialize a newly created parser to parse tokens in the given [_source]
    * and to report any errors that are found to the given [_errorListener].
    */
-  Parser(this._source, this._errorListener);
+  factory Parser(Source source, AnalysisErrorListener errorListener,
+      {bool useFasta}) {
+    if (useFasta ?? Parser.useFasta) {
+      return new _Parser2(source, errorListener);
+    } else {
+      return new Parser._(source, errorListener);
+    }
+  }
+
+  Parser._(this._source, this._errorListener);
 
   /**
    * Return the current token.
    */
   Token get currentToken => _currentToken;
 
   /**
    * Set the token with which the parse is to begin to the given [token].
    */
   void set currentToken(Token token) {
@@ skipping 8324 matching lines @@
     }
   }
 }
 
 /**
  * Instances of this class are thrown when the parser detects that AST has
  * too many nested expressions to be parsed safely and avoid possibility of
  * [StackOverflowError] in the parser or during later analysis.
  */
 class _TooDeepTreeError {}