Handle multiline interpolated strings in line-based scanner.

dart/site/try/src/editor.dart

 // Copyright (c) 2013, 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 trydart.editor;
 
 import 'dart:html';
 
 import 'package:compiler/implementation/scanner/scannerlib.dart' show
     EOF_TOKEN,
@@ skipping 216 matching lines @@
     outputDiv.appendText('$message\n');
   }
 
   observer.takeRecords();
   observer.observe(
       mainEditorPane, childList: true, characterData: true, subtree: true);
 }
 
 Decoration getDecoration(Token token) {
   if (token is ErrorToken) {
+    // TODO(ahe): Remove side effects from this method. It only leads to
+    // confusion.
     isMalformedInput = true;
     return new DiagnosticDecoration('error', token.assertionMessage);
   }
   String tokenValue = token.value;
   String tokenInfo = token.info.value;
   if (tokenInfo == 'string') return currentTheme.string;
   if (tokenInfo == 'identifier') {
     seenIdentifiers.add(tokenValue);
     Decoration decoration = currentTheme.foreground;
     if (settings.enableCodeCompletion.value) {
       decoration = CodeCompletionDecoration.from(decoration);
     }
     return decoration;
   }
   if (tokenInfo == 'keyword') return currentTheme.keyword;
   if (tokenInfo == 'comment') return currentTheme.singleLineComment;
   if (tokenInfo == 'malformed input') {
+    // TODO(ahe): Remove side effects from this method. It only leads to
+    // confusion.
     isMalformedInput = true;
     return new DiagnosticDecoration('error', tokenValue);
   }
   return currentTheme.foreground;
 }
 
 diagnostic(content, tip) {
   if (content is String) {
     content = new Text(content);
   }
   if (content is! List) {
     content = [content];
   }
   return new AnchorElement()
       ..classes.add('diagnostic')
       ..append(tip) // Should be first for better Firefox editing.
       ..nodes.addAll(content);
 }