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// 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.scanner.scanner;
import 'package:analyzer/error/error.dart';
import 'package:analyzer/error/listener.dart';
import 'package:analyzer/src/dart/error/syntactic_errors.dart';
import 'package:analyzer/src/dart/scanner/reader.dart';
import 'package:analyzer/src/generated/source.dart';
import 'package:front_end/src/scanner/scanner.dart' as fe;
export 'package:analyzer/src/dart/error/syntactic_errors.dart';
export 'package:front_end/src/scanner/scanner.dart' show KeywordState;
* The class `Scanner` implements a scanner for Dart code.
* The lexical structure of Dart is ambiguous without knowledge of the context
* in which a token is being scanned. For example, without context we cannot
* determine whether source of the form "<<" should be scanned as a single
* left-shift operator or as two left angle brackets. This scanner does not have
* any context, so it always resolves such conflicts by scanning the longest
* possible token.
class Scanner extends fe.Scanner {
* The source being scanned.
final Source source;
* The error listener that will be informed of any errors that are found
* during the scan.
final AnalysisErrorListener _errorListener;
* Initialize a newly created scanner to scan characters from the given
* [source]. The given character [reader] will be used to read the characters
* in the source. The given [_errorListener] will be informed of any errors
* that are found.
Scanner(this.source, CharacterReader reader, this._errorListener)
: super(reader);
void reportError(
ScannerErrorCode errorCode, int offset, List<Object> arguments) {
.onError(new AnalysisError(source, offset, 1, errorCode, arguments));