"Reverting 22400"

tools/dom/src/CssClassSet.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;
 
-/** A Set that stores the CSS class names for an element. */
 abstract class CssClassSet implements Set<String> {
 
+  String toString() {
+    return readClasses().join(' ');
+  }
+
   /**
    * Adds the class [value] to the element if it is not on it, removes it if it
    * is.
    */
-  bool toggle(String value);
+  bool toggle(String value) {
+    Set<String> s = readClasses();
+    bool result = false;
+    if (s.contains(value)) {
+      s.remove(value);
+    } else {
+      s.add(value);
+      result = true;
+    }
+    writeClasses(s);
+    return result;
+  }
 
   /**
    * Returns [:true:] if classes cannot be added or removed from this
    * [:CssClassSet:].
    */
-  bool get frozen;
+  bool get frozen => false;
 
+  // interface Iterable - BEGIN
+  Iterator<String> get iterator => readClasses().iterator;
+  // interface Iterable - END
+
+  // interface Collection - BEGIN
+  void forEach(void f(String element)) {
+    readClasses().forEach(f);
+  }
+
+  String join([String separator = ""]) => readClasses().join(separator);
+
+  Iterable map(f(String element)) => readClasses().map(f);
+
+  Iterable<String> where(bool f(String element)) => readClasses().where(f);
+
+  Iterable expand(Iterable f(String element)) => readClasses().expand(f);
+
+  bool every(bool f(String element)) => readClasses().every(f);
+
+  bool any(bool f(String element)) => readClasses().any(f);
+
+  bool get isEmpty => readClasses().isEmpty;
+
+  int get length => readClasses().length;
+
+  String reduce(String combine(String value, String element)) {
+    return readClasses().reduce(combine);
+  }
+
+  dynamic fold(dynamic initialValue,
+      dynamic combine(dynamic previousValue, String element)) {
+    return readClasses().fold(initialValue, combine);
+  }
+  // interface Collection - END
+
+  // interface Set - BEGIN
   /**
    * 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);
+  bool contains(String value) => readClasses().contains(value);
 
   /**
    * Add the class [value] to element.
    *
    * This is the Dart equivalent of jQuery's
    * [addClass](http://api.jquery.com/addClass/).
    */
-  void add(String value);
+  void add(String value) {
+    // TODO - figure out if we need to do any validation here
+    // or if the browser natively does enough.
+    _modify((s) => s.add(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);
+  bool remove(Object value) {
+    if (value is! String) return false;
+    Set<String> s = readClasses();
+    bool result = s.remove(value);
+    writeClasses(s);
+    return result;
+  }
 
   /**
    * 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);
+  void addAll(Iterable<String> iterable) {
+    // TODO - see comment above about validation.
+    _modify((s) => s.addAll(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);
+  void removeAll(Iterable<String> iterable) {
+    _modify((s) => s.removeAll(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/).
    */
-  void toggleAll(Iterable<String> iterable);
-}
-
-/**
- * A set (union) of the CSS classes that are present in a set of elements.
- * Implemented separately from _ElementCssClassSet for performance.
- */
-class _MultiElementCssClassSet extends CssClassSetImpl {
-  final Iterable<Element> _elementIterable;
-  Iterable<_ElementCssClassSet> _elementCssClassSetIterable;
-
-  _MultiElementCssClassSet(this._elementIterable) {
-    _elementCssClassSetIterable = new List.from(_elementIterable).map(
-        (e) => new _ElementCssClassSet(e));
+  void toggleAll(Iterable<String> iterable) {
+    iterable.forEach(toggle);
   }
 
-  Set<String> readClasses() {
-    var s = new LinkedHashSet<String>();
-    _elementCssClassSetIterable.forEach((e) => s.addAll(e.readClasses()));
-    return s;
+  void retainAll(Iterable<String> iterable) {
+    _modify((s) => s.retainAll(iterable));
   }
 
-  void writeClasses(Set<String> s) {
-    var classes = new List.from(s).join(' ');
-    for (Element e in _elementIterable) {
-      e.$dom_className = classes;
-    }
+  void removeWhere(bool test(String name)) {
+    _modify((s) => s.removeWhere(test));
   }
 
+  void retainWhere(bool test(String name)) {
+    _modify((s) => s.retainWhere(test));
+  }
+
+  bool containsAll(Iterable<String> collection) =>
+    readClasses().containsAll(collection);
+
+  Set<String> intersection(Set<String> other) =>
+    readClasses().intersection(other);
+
+  Set<String> union(Set<String> other) =>
+    readClasses().union(other);
+
+  Set<String> difference(Set<String> other) =>
+    readClasses().difference(other);
+
+  String get first => readClasses().first;
+  String get last => readClasses().last;
+  String get single => readClasses().single;
+  List<String> toList({ bool growable: true }) =>
+      readClasses().toList(growable: growable);
+  Set<String> toSet() => readClasses().toSet();
+  Iterable<String> take(int n) => readClasses().take(n);
+  Iterable<String> takeWhile(bool test(String value)) =>
+      readClasses().takeWhile(test);
+  Iterable<String> skip(int n) => readClasses().skip(n);
+  Iterable<String> skipWhile(bool test(String value)) =>
+      readClasses().skipWhile(test);
+  String firstWhere(bool test(String value), { String orElse() }) =>
+      readClasses().firstWhere(test, orElse: orElse);
+  String lastWhere(bool test(String value), {String orElse()}) =>
+      readClasses().lastWhere(test, orElse: orElse);
+  String singleWhere(bool test(String value)) =>
+      readClasses().singleWhere(test);
+  String elementAt(int index) => readClasses().elementAt(index);
+
+  void clear() {
+    _modify((s) => s.clear());
+  }
+  // interface Set - END
+
   /**
    * Helper method used to modify the set of css classes on this element.
    *
    *   f - callback with:
    *   s - a Set of all the css class name currently on this element.
    *
    *   After f returns, the modified set is written to the
    *       className property of this element.
    */
-  void modify( f(Set<String> s)) {
-    _elementCssClassSetIterable.forEach((e) => e.modify(f));
+  void _modify( f(Set<String> s)) {
+    Set<String> s = readClasses();
+    f(s);
+    writeClasses(s);
   }
 
   /**
-   * Adds the class [value] to the element if it is not on it, removes it if it
-   * is.
+   * Read the class names from the Element class property,
+   * and put them into a set (duplicates are discarded).
+   * This is intended to be overridden by specific implementations.
    */
-  bool toggle(String value) =>
-      _modifyWithReturnValue((e) => e.toggle(value));
+  Set<String> readClasses();
 
   /**
-   * 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/).
+   * 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.
    */
-  bool remove(Object value) => _modifyWithReturnValue((e) => e.remove(value));
-
-  bool _modifyWithReturnValue(f) => _elementCssClassSetIterable.fold(
-      false, (prevValue, element) => f(element) || prevValue);
+  void writeClasses(Set<String> s);
 }
-
-class _ElementCssClassSet extends CssClassSetImpl {
-
-  final Element _element;
-
-  _ElementCssClassSet(this._element);
-
-  Set<String> readClasses() {
-    var s = new LinkedHashSet<String>();
-    var classname = _element.$dom_className;
-
-    for (String name in classname.split(' ')) {
-      String trimmed = name.trim();
-      if (!trimmed.isEmpty) {
-        s.add(trimmed);
-      }
-    }
-    return s;
-  }
-
-  void writeClasses(Set<String> s) {
-    List list = new List.from(s);
-    _element.$dom_className = s.join(' ');
-  }
-}