Implement the new '??' operator in analyzer.

pkg/analyzer/lib/src/generated/html.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.html;
 
 import 'dart:collection';
 
 import 'ast.dart';
 import 'element.dart';
-import 'engine.dart' show AnalysisEngine;
+import 'engine.dart' show AnalysisOptions, AnalysisEngine;
 import 'error.dart' show AnalysisErrorListener;
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'parser.dart' show Parser;
 import 'scanner.dart' as sc show Scanner, SubSequenceReader, Token;
 import 'source.dart';
 
 /**
  * The abstract class `AbstractScanner` implements a scanner for HTML code. Subclasses are
  * required to implement the interface used to access the characters being scanned.
@@ skipping 356 matching lines @@
   /**
    * The line information associated with the source being parsed.
    */
   LineInfo _lineInfo;
 
   /**
    * The error listener to which errors will be reported.
    */
   final AnalysisErrorListener _errorListener;
 
+  final AnalysisOptions _options;
+
   /**
    * Construct a parser for the specified source.
    *
-   * @param source the source being parsed
-   * @param errorListener the error listener to which errors will be reported
+   * [source] is the source being parsed.  [_errorListener] is the error
+   * listener to which errors will be reported.  [_options] is the analysis
+   * options which should be used for parsing.
    */
-  HtmlParser(Source source, this._errorListener) : super(source);
+  HtmlParser(Source source, this._errorListener, this._options) : super(source);
 
   @override
   XmlAttributeNode createAttributeNode(Token name, Token equals, Token value) =>
       new XmlAttributeNode(name, equals, value);
 
   @override
   XmlTagNode createTagNode(Token nodeStart, Token tag,
       List<XmlAttributeNode> attributes, Token attributeEnd,
       List<XmlTagNode> tagNodes, Token contentEnd, Token closingTag,
       Token nodeEnd) {
     if (_isScriptNode(tag, attributes, tagNodes)) {
       HtmlScriptTagNode tagNode = new HtmlScriptTagNode(nodeStart, tag,
           attributes, attributeEnd, tagNodes, contentEnd, closingTag, nodeEnd);
       String contents = tagNode.content;
       int contentOffset = attributeEnd.end;
       LineInfo_Location location = _lineInfo.getLocation(contentOffset);
       sc.Scanner scanner = new sc.Scanner(source,
           new sc.SubSequenceReader(contents, contentOffset), _errorListener);
+      scanner.enableNullAwareOperators = _options.enableNullAwareOperators;
       scanner.setSourceStart(location.lineNumber, location.columnNumber);
       sc.Token firstToken = scanner.tokenize();
       Parser parser = new Parser(source, _errorListener);
       CompilationUnit unit = parser.parseCompilationUnit(firstToken);
       unit.lineInfo = _lineInfo;
       tagNode.script = unit;
       return tagNode;
     }
     return new XmlTagNode(nodeStart, tag, attributes, attributeEnd, tagNodes,
         contentEnd, closingTag, nodeEnd);
@@ skipping 1450 matching lines @@
  */
 abstract class XmlVisitor<R> {
   R visitHtmlScriptTagNode(HtmlScriptTagNode node);
 
   R visitHtmlUnit(HtmlUnit htmlUnit);
 
   R visitXmlAttributeNode(XmlAttributeNode xmlAttributeNode);
 
   R visitXmlTagNode(XmlTagNode xmlTagNode);
 }