Making almost all dom_ methods private. Exceptions will be addressed in a later CL.

tools/dom/src/AttributeMap.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.
 
 part of html;
 
 abstract class _AttributeMap implements Map<String, String> {
   final Element _element;
 
   _AttributeMap(this._element);
@@ skipping 22 matching lines @@
 
   void forEach(void f(String key, String value)) {
     for (var key in keys) {
       var value = this[key];
       f(key, value);
     }
   }
 
   Iterable<String> get keys {
     // TODO: generate a lazy collection instead.
-    var attributes = _element.$dom_attributes;
+    var attributes = _element._attributes;
     var keys = new List<String>();
     for (int i = 0, len = attributes.length; i < len; i++) {
       if (_matches(attributes[i])) {
         keys.add(attributes[i].name);
       }
     }
     return keys;
   }
 
   Iterable<String> get values {
     // TODO: generate a lazy collection instead.
-    var attributes = _element.$dom_attributes;
+    var attributes = _element._attributes;
     var values = new List<String>();
     for (int i = 0, len = attributes.length; i < len; i++) {
       if (_matches(attributes[i])) {
         values.add(attributes[i].value);
       }
     }
     return values;
   }
 
   /**
@@ skipping 15 matching lines @@
 }
 
 /**
  * Wrapper to expose [Element.attributes] as a typed map.
  */
 class _ElementAttributeMap extends _AttributeMap {
 
   _ElementAttributeMap(Element element): super(element);
 
   bool containsKey(String key) {
-    return _element.$dom_hasAttribute(key);
+    return _element._hasAttribute(key);
   }
 
   String operator [](String key) {
     return _element.$dom_getAttribute(key);
   }
 
   void operator []=(String key, String value) {
     _element.$dom_setAttribute(key, value);
   }
 
   String remove(String key) {
     String value = _element.$dom_getAttribute(key);
-    _element.$dom_removeAttribute(key);
+    _element._removeAttribute(key);
     return value;
   }
 
   /**
    * The number of {key, value} pairs in the map.
    */
   int get length {
     return keys.length;
   }
 
-  bool _matches(Node node) => node.$dom_namespaceUri == null;
+  bool _matches(Node node) => node._namespaceUri == null;
 }
 
 /**
  * Wrapper to expose namespaced attributes as a typed map.
  */
 class _NamespacedAttributeMap extends _AttributeMap {
 
   final String _namespace;
 
   _NamespacedAttributeMap(Element element, this._namespace): super(element);
 
   bool containsKey(String key) {
-    return _element.$dom_hasAttributeNS(_namespace, key);
+    return _element._hasAttributeNS(_namespace, key);
   }
 
   String operator [](String key) {
     return _element.$dom_getAttributeNS(_namespace, key);
   }
 
   void operator []=(String key, String value) {
     _element.$dom_setAttributeNS(_namespace, key, value);
   }
 
   String remove(String key) {
     String value = this[key];
-    _element.$dom_removeAttributeNS(_namespace, key);
+    _element._removeAttributeNS(_namespace, key);
     return value;
   }
 
   /**
    * The number of {key, value} pairs in the map.
    */
   int get length {
     return keys.length;
   }
 
-  bool _matches(Node node) => node.$dom_namespaceUri == _namespace;
+  bool _matches(Node node) => node._namespaceUri == _namespace;
 }
 
 
 /**
  * Provides a Map abstraction on top of data-* attributes, similar to the
  * dataSet in the old DOM.
  */
 class _DataAttributeMap implements Map<String, String> {
 
-  final Map<String, String> $dom_attributes;
+  final Map<String, String> _attributes;
 
-  _DataAttributeMap(this.$dom_attributes);
+  _DataAttributeMap(this._attributes);
 
   // interface Map
 
   // TODO: Use lazy iterator when it is available on Map.
   bool containsValue(String value) => values.any((v) => v == value);
 
-  bool containsKey(String key) => $dom_attributes.containsKey(_attr(key));
+  bool containsKey(String key) => _attributes.containsKey(_attr(key));
 
-  String operator [](String key) => $dom_attributes[_attr(key)];
+  String operator [](String key) => _attributes[_attr(key)];
 
   void operator []=(String key, String value) {
-    $dom_attributes[_attr(key)] = value;
+    _attributes[_attr(key)] = value;
   }
 
   String putIfAbsent(String key, String ifAbsent()) =>
-    $dom_attributes.putIfAbsent(_attr(key), ifAbsent);
+    _attributes.putIfAbsent(_attr(key), ifAbsent);
 
-  String remove(String key) => $dom_attributes.remove(_attr(key));
+  String remove(String key) => _attributes.remove(_attr(key));
 
   void clear() {
     // Needs to operate on a snapshot since we are mutating the collection.
     for (String key in keys) {
       remove(key);
     }
   }
 
   void forEach(void f(String key, String value)) {
-    $dom_attributes.forEach((String key, String value) {
+    _attributes.forEach((String key, String value) {
       if (_matches(key)) {
         f(_strip(key), value);
       }
     });
   }
 
   Iterable<String> get keys {
     final keys = new List<String>();
-    $dom_attributes.forEach((String key, String value) {
+    _attributes.forEach((String key, String value) {
       if (_matches(key)) {
         keys.add(_strip(key));
       }
     });
     return keys;
   }
 
   Iterable<String> get values {
     final values = new List<String>();
-    $dom_attributes.forEach((String key, String value) {
+    _attributes.forEach((String key, String value) {
       if (_matches(key)) {
         values.add(value);
       }
     });
     return values;
   }
 
   int get length => keys.length;
 
   // TODO: Use lazy iterator when it is available on Map.
   bool get isEmpty => length == 0;
 
   bool get isNotEmpty => !isEmpty;
 
   // Helpers.
   String _attr(String key) => 'data-$key';
   bool _matches(String key) => key.startsWith('data-');
   String _strip(String key) => key.substring(5);
 }