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html/lib/src/css_class_set.dart

-// 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.
-
-// TODO(jmesserly): everything in this file is copied straight from "dart:html".
-library html.dom.src;
-
-import 'dart:collection';
-import 'package:html/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) {
-    _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.
-   *
-   * 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]) {
-    Set<String> s = readClasses();
-    bool result = false;
-    if (shouldAdd == null) shouldAdd = !s.contains(value);
-    if (shouldAdd) {
-      s.add(value);
-      result = true;
-    } else {
-      s.remove(value);
-    }
-    writeClasses(s);
-    return result;
-  }
-
-  /**
-   * Returns [:true:] if classes cannot be added or removed from this
-   * [:CssClassSet:].
-   */
-  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;
-
-  bool get isNotEmpty => readClasses().isNotEmpty;
-
-  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) => readClasses().contains(value);
-
-  /** Lookup from the Set interface. Not interesting for a String set. */
-  String lookup(String value) => contains(value) ? value : null;
-
-  /**
-   * Add the class [value] to element.
-   *
-   * This is the Dart equivalent of jQuery's
-   * [addClass](http://api.jquery.com/addClass/).
-   */
-  bool add(String value) {
-    // TODO - figure out if we need to do any validation here
-    // or if the browser natively does enough.
-    return 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) {
-    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) {
-    // 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) {
-    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/).
-   * 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]) {
-    iterable.forEach((e) => toggle(e, shouldAdd));
-  }
-
-  void retainAll(Iterable<String> iterable) {
-    modify((s) => s.retainAll(iterable));
-  }
-
-  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);
-  dynamic firstWhere(bool test(String value), {Object orElse()}) =>
-      readClasses().firstWhere(test, orElse: orElse);
-  dynamic lastWhere(bool test(String value), {Object 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.
-   */
-  modify(f(Set<String> s)) {
-    Set<String> s = readClasses();
-    var ret = f(s);
-    writeClasses(s);
-    return ret;
-  }
-
-  /**
-   * 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.
-   */
-  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);
-}