Make isEmpty a getter.

utils/apidoc/html_diff.dart

 // Copyright (c) 2012, 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.
 
 /**
  * A script to assist in documenting the difference between the dart:html API
  * and the old DOM API.
  */
 #library('html_diff');
 
@@ skipping 85 matching lines @@
    * [HtmlDiff.initialize] should be called.
    */
   void run() {
     LibraryMirror htmlLib = _mirrors.libraries[HTML_DECLARED_NAME];
     if (htmlLib === null) {
       warn('Could not find $HTML_LIBRARY_NAME');
       return;
     }
     for (InterfaceMirror htmlType in htmlLib.types.getValues()) {
       final domTypes = htmlToDomTypes(htmlType);
-      if (domTypes.isEmpty()) continue;
+      if (domTypes.isEmpty) continue;
 
       htmlTypesToDom.putIfAbsent(htmlType.qualifiedName,
           () => new Set()).addAll(domTypes);
 
       htmlType.declaredMembers.forEach(
           (_, m) => _addMemberDiff(m, domTypes));
     }
   }
 
   /**
    * Records the `@domName` to `dart:html` mapping for
    * [htmlMember] (from `dart:html`). [domTypes] are the
    * `@domName` type values that correspond to [htmlMember]'s
    * defining type.
    */
   void _addMemberDiff(MemberMirror htmlMember, List<String> domTypes) {
     var domMembers = htmlToDomMembers(htmlMember, domTypes);
-    if (htmlMember == null && !domMembers.isEmpty()) {
+    if (htmlMember == null && !domMembers.isEmpty) {
       warn('$HTML_LIBRARY_NAME member '
            '${htmlMember.surroundingDeclaration.simpleName}.'
            '${htmlMember.simpleName} has no corresponding '
            '$HTML_LIBRARY_NAME member.');
     }
 
     if (htmlMember == null) return;
-    if (!domMembers.isEmpty()) {
+    if (!domMembers.isEmpty) {
       htmlToDom[htmlMember.qualifiedName] = domMembers;
     }
   }
 
   /**
    * Returns the `@domName` type values that correspond to
    * [htmlType] from `dart:html`. This can be the empty list if no
    * correspondence is found.
    */
   List<String> htmlToDomTypes(InterfaceMirror htmlType) {
@@ skipping 22 matching lines @@
     final tags = _getTags(comments.find(htmlMember.location));
     if (tags.containsKey('domName')) {
       var domNames = <String>[];
       for (var s in tags['domName'].split(',')) {
         domNames.add(s.trim());
       }
       if (domNames.length == 1 && domNames[0] == 'none') return new Set();
       final members = new Set();
       domNames.forEach((name) {
         var nameMembers = _membersFromName(name, domTypes);
-        if (nameMembers.isEmpty()) {
+        if (nameMembers.isEmpty) {
           if (name.contains('.')) {
             warn('no member $name');
           } else {
             final options = <String>[];
             for (var t in domTypes) {
               options.add('$t.$name');
             }
             Strings.join(options, ' or ');
             warn('no member $options');
           }
         }
         members.addAll(nameMembers);
       });
       return members;
     }
 
     return new Set();
   }
 
   /**
    * Returns the `@domName` strings that are indicated by
    * [name]. [name] can be either an unqualified member name
    * (e.g. `createElement`), in which case it's treated as the name of
    * a member of one of [defaultTypes], or a fully-qualified member
    * name (e.g. `Document.createElement`), in which case it's treated as a
    * member of the @domName element (`Document` in this case).
    */
   Set<String> _membersFromName(String name, List<String> defaultTypes) {
     if (!name.contains('.', 0)) {
-      if (defaultTypes.isEmpty()) {
+      if (defaultTypes.isEmpty) {
         warn('no default type for $name');
         return new Set();
       }
       final members = new Set<String>();
       defaultTypes.forEach((t) { members.add('$t.$name'); });
       return members;
     }
 
     if (name.split('.').length != 2) {
       warn('invalid member name ${name}');
@@ skipping 13 matching lines @@
   Map<String, String> _getTags(String comment) {
     if (comment == null) return const <String, String>{};
     final re = const RegExp("@([a-zA-Z]+) ([^;]+)(?:;|\$)");
     final tags = <String, String>{};
     for (var m in re.allMatches(comment.trim())) {
       tags[m[1]] = m[2];
     }
     return tags;
   }
 }