[html5lib] implement querySelector/querySelectorAll

pkg/third_party/html5lib/lib/src/css_class_set.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
-part of html_common;
+// TODO(jmesserly): everything in this file is copied straight from "dart:html".
+library html5lib.dom.src;
+
+import 'dart:collection';
+import 'package:html5lib/dom.dart';
+
+class ElementCssClassSet extends CssClassSetImpl {
+
+  final Element _element;
+
+  ElementCssClassSet(this._element);
+
+  Set<String> readClasses() {
+    var s = new LinkedHashSet<String>();
+    var classname = _element.className;
+
+    for (String name in classname.split(' ')) {
+      String trimmed = name.trim();
+      if (!trimmed.isEmpty) {
+        s.add(trimmed);
+      }
+    }
+    return s;
+  }
+
+  void writeClasses(Set<String> s) {
+    List list = new List.from(s);
+    _element.className = s.join(' ');
+  }
+}
+
+
+/** A Set that stores the CSS class names for an element. */
+abstract class CssClassSet implements Set<String> {
+
+  /**
+   * Adds the class [value] to the element if it is not on it, removes it if it
+   * is.
+   *
+   * If [shouldAdd] is true, then we always add that [value] to the element. If
+   * [shouldAdd] is false then we always remove [value] from the element.
+   */
+  bool toggle(String value, [bool shouldAdd]);
+
+  /**
+   * Returns [:true:] if classes cannot be added or removed from this
+   * [:CssClassSet:].
+   */
+  bool get frozen;
+
+  /**
+   * Determine if this element contains the class [value].
+   *
+   * This is the Dart equivalent of jQuery's
+   * [hasClass](http://api.jquery.com/hasClass/).
+   */
+  bool contains(String value);
+
+  /**
+   * Add the class [value] to element.
+   *
+   * This is the Dart equivalent of jQuery's
+   * [addClass](http://api.jquery.com/addClass/).
+   *
+   * If this corresponds to one element. Returns true if [value] was added to
+   * the set, otherwise false.
+   *
+   * If this corresponds to many elements, null is always returned.
+   */
+  bool add(String value);
+
+  /**
+   * Remove the class [value] from element, and return true on successful
+   * removal.
+   *
+   * This is the Dart equivalent of jQuery's
+   * [removeClass](http://api.jquery.com/removeClass/).
+   */
+  bool remove(Object value);
+
+  /**
+   * Add all classes specified in [iterable] to element.
+   *
+   * This is the Dart equivalent of jQuery's
+   * [addClass](http://api.jquery.com/addClass/).
+   */
+  void addAll(Iterable<String> iterable);
+
+  /**
+   * Remove all classes specified in [iterable] from element.
+   *
+   * This is the Dart equivalent of jQuery's
+   * [removeClass](http://api.jquery.com/removeClass/).
+   */
+  void removeAll(Iterable<String> iterable);
+
+  /**
+   * Toggles all classes specified in [iterable] on element.
+   *
+   * Iterate through [iterable]'s items, and add it if it is not on it, or
+   * remove it if it is. This is the Dart equivalent of jQuery's
+   * [toggleClass](http://api.jquery.com/toggleClass/).
+   * If [shouldAdd] is true, then we always add all the classes in [iterable]
+   * element. If [shouldAdd] is false then we always remove all the classes in
+   * [iterable] from the element.
+   */
+  void toggleAll(Iterable<String> iterable, [bool shouldAdd]);
+}
 
 abstract class CssClassSetImpl implements CssClassSet {
 
   String toString() {
     return readClasses().join(' ');
   }
 
   /**
    * Adds the class [value] to the element if it is not on it, removes it if it
    * is.
@@ skipping 204 matching lines @@
    */
   Set<String> readClasses();
 
   /**
    * Join all the elements of a set into one string and write
    * back to the element.
    * This is intended to be overridden by specific implementations.
    */
   void writeClasses(Set<String> s);
 }