Break up another large file

pkg/analyzer/lib/src/dart/scanner/scanner.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.scanner.scanner;
 
 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/token.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
-import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:charcode/ascii.dart';
 
 /**
  * A state in a state machine used to scan keywords.
  */
 class KeywordState {
   /**
    * An empty transition table used by leaf states.
@@ skipping 775 matching lines @@
         }
         return next;
       }
       next = _reader.advance();
     }
   }
 
   int _tokenizeFractionPart(int next, int start) {
     bool done = false;
     bool hasDigit = false;
-    LOOP: while (!done) {
+    LOOP:
+    while (!done) {
       if ($0 <= next && next <= $9) {
         hasDigit = true;
       } else if ($e == next || $E == next) {
         hasDigit = true;
         next = _tokenizeExponent(_reader.advance());
         done = true;
         continue LOOP;
       } else {
         done = true;
         continue LOOP;
@@ skipping 213 matching lines @@
         next = _reader.advance();
         recordStartOfLine();
       } else {
         next = _reader.advance();
       }
     }
   }
 
   int _tokenizeMultiLineRawString(int quoteChar, int start) {
     int next = _reader.advance();
-    outer: while (next != -1) {
+    outer:
+    while (next != -1) {
       while (next != quoteChar) {
         if (next == -1) {
           break outer;
         } else if (next == $cr) {
           next = _reader.advance();
           if (next == $lf) {
             next = _reader.advance();
           }
           recordStartOfLine();
         } else if (next == $lf) {
@@ skipping 332 matching lines @@
    */
   const ScannerErrorCode(String name, String message, [String correction])
       : super(name, message, correction);
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.ERROR;
 
   @override
   ErrorType get type => ErrorType.SYNTACTIC_ERROR;
 }