Revert "Add some sweet XML classes."

client/html/src/XMLElementWrappingImplementation.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.
-
-class _XMLClassSet extends _CssClassSet {
-  _XMLClassSet(element) : super(element);
-
-  String _className() {
-    final classStr = _element.getAttribute('class');
-    return classStr == null ? '' : classStr;
-  }
-
-  void _write(Set s) => _element.setAttribute('class', _formatSet(s));
-}
-
-class XMLElementWrappingImplementation extends ElementWrappingImplementation
-    implements XMLElement {
-  XMLElementWrappingImplementation._wrap(ptr) : super._wrap(ptr);
-
-  factory XMLElementWrappingImplementation.tag(String tag) =>
-    LevelDom.wrapElement(dom.document.createElementNS(null, tag));
-
-  factory XMLElementWrappingImplementation.xml(String xml) {
-    XMLElement parentTag = new XMLElement.tag('xml');
-    parentTag.innerHTML = xml;
-    if (parentTag.nodes.length == 1) return parentTag.nodes.removeLast();
-
-    throw new IllegalArgumentException('XML had ${parentTag.nodes.length} ' +
-        'top-level nodes but 1 expected');
-  }
-
-  Set<String> get classes() {
-    if (_cssClassSet === null) {
-      _cssClassSet = new _XMLClassSet(_ptr);
-    }
-    return _cssClassSet;
-  }
-
-  ElementList get elements() {
-    if (_elements == null) {
-      _elements = new FilteredElementList(this);
-    }
-    return _elements;
-  }
-
-  // TODO: The type of value should be Collection<Element>. See http://b/5392897
-  void set elements(value) {
-    final elements = this.elements;
-    elements.clear();
-    elements.addAll(value);
-  }
-
-  String get outerHTML() {
-    final container = new Element.tag("div");
-    container.elements.add(this.clone(true));
-    return container.innerHTML;
-  }
-
-  String get innerHTML() {
-    final container = new Element.tag("div");
-    container.nodes.addAll(this.clone(true).nodes);
-    return container.innerHTML;
-  }
-
-  void set innerHTML(String xml) {
-    final xmlDoc = new XMLDocument.xml('<xml>$xml</xml>');
-    this.nodes = xmlDoc.nodes;
-  }
-
-  Node _insertAdjacentNode(String where, Node node) {
-    switch (where.toLowerCase()) {
-      case "beforebegin":
-        if (parent == null) return null;
-        parent.insertBefore(node, this);
-        return node;
-      case "afterend":
-        if (parent == null) return null;
-        if (nextNode == null) {
-          parent.nodes.add(node);
-        } else {
-          parent.insertBefore(node, nextNode);
-        }
-        return node;
-      case "afterbegin":
-        this.insertBefore(node, nodes.first);
-        return node;
-      case "beforeend":
-        this.nodes.add(node);
-        return node;
-      default:
-        throw new IllegalArgumentException("Invalid position ${where}");
-    }
-  }
-
-  XMLElement insertAdjacentElement([String where = null,
-      XMLElement element = null]) => this._insertAdjacentNode(where, element);
-
-  void insertAdjacentText([String where = null, String text = null]) {
-    this._insertAdjacentNode(where, new Text(text));
-  }
-
-  void insertAdjacentHTML(
-      [String position_OR_where = null, String text = null]) {
-    this._insertAdjacentNode(
-      position_OR_where, new DocumentFragment.xml(text));
-  }
-
-  // For HTML elemens, the default value of "contentEditable" is "inherit", so
-  // we'll use that here as well even though it doesn't really make sense.
-  String get contentEditable() => _attr('contentEditable', 'inherit');
-
-  void set contentEditable(String value) {
-    attributes['contentEditable'] = value;
-  }
-
-  // Parentless HTML elements return false regardless of the value of their
-  // contentEditable attribute, so XML elements do the same since they're never
-  // actually editable.
-  bool get isContentEditable() => false;
-
-  bool get draggable() => attributes['draggable'] == 'true';
-
-  void set draggable(bool value) { attributes['draggable'] = value.toString(); }
-
-  bool get spellcheck() => attributes['spellcheck'] == 'true';
-
-  void set spellcheck(bool value) {
-    attributes['spellcheck'] = value.toString();
-  }
-
-  bool get hidden() => attributes.containsKey('hidden');
-
-  void set hidden(bool value) {
-    if (value) {
-      attributes['hidden'] = '';
-    } else {
-      attributes.remove('hidden');
-    }
-  }
-
-  int get tabIndex() {
-    try {
-      return Math.parseInt(_attr('tabIndex'));
-    } catch (BadNumberFormatException e) {
-      return 0;
-    }
-  }
-
-  void set tabIndex(int value) { attributes['tabIndex'] = value.toString(); }
-
-  String get id() => _attr('id');
-
-  void set id(String value) { attributes['id'] = value; }
-
-  String get title() => _attr('title');
-
-  void set title(String value) { attributes['title'] = value; }
-
-  String get webkitdropzone() => _attr('webkitdropzone');
-
-  void set webkitdropzone(String value) {
-    attributes['webkitdropzone'] = value;
-  }
-
-  String get lang() => _attr('lang');
-
-  void set lang(String value) { attributes['lang'] = value; }
-
-  String get dir() => _attr('dir');
-
-  void set dir(String value) { attributes['dir'] = value; }
-
-  String _attr(String name, [String def = '']) =>
-    attributes.containsKey(name) ? attributes[name] : def;
-}