diff -r 000000000000 -r 6474c204b198 editor/libeditor/html/nsHTMLEditUtils.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/libeditor/html/nsHTMLEditUtils.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,843 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"         // for ArrayLength
+#include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
+#include "mozilla/dom/Element.h"        // for Element, nsINode
+#include "nsAString.h"                  // for nsAString_internal::IsEmpty
+#include "nsCOMPtr.h"                   // for nsCOMPtr, operator==, etc
+#include "nsCaseTreatment.h"
+#include "nsDebug.h"                    // for NS_PRECONDITION, etc
+#include "nsEditProperty.h"             // for nsEditProperty, etc
+#include "nsEditor.h"                   // for nsEditor
+#include "nsError.h"                    // for NS_SUCCEEDED
+#include "nsGkAtoms.h"                  // for nsGkAtoms, nsGkAtoms::a, etc
+#include "nsHTMLEditUtils.h"
+#include "nsHTMLTags.h"
+#include "nsIAtom.h"                    // for nsIAtom
+#include "nsIDOMHTMLAnchorElement.h"    // for nsIDOMHTMLAnchorElement
+#include "nsIDOMNode.h"                 // for nsIDOMNode
+#include "nsNameSpaceManager.h"        // for kNameSpaceID_None
+#include "nsLiteralString.h"            // for NS_LITERAL_STRING
+#include "nsString.h"                   // for nsAutoString
+#include "nsTextEditUtils.h"            // for nsTextEditUtils
+
+using namespace mozilla;
+
+///////////////////////////////////////////////////////////////////////////
+//                  
+bool 
+nsHTMLEditUtils::IsBig(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::big);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsInlineStyle true if node is an inline style
+//                  
+bool 
+nsHTMLEditUtils::IsInlineStyle(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsInlineStyle");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsInlineStyle(node);
+}
+
+bool
+nsHTMLEditUtils::IsInlineStyle(nsINode* aNode)
+{
+  MOZ_ASSERT(aNode);
+  nsIAtom* nodeAtom = aNode->Tag();
+  return (nodeAtom == nsEditProperty::b)
+      || (nodeAtom == nsEditProperty::i)
+      || (nodeAtom == nsEditProperty::u)
+      || (nodeAtom == nsEditProperty::tt)
+      || (nodeAtom == nsEditProperty::s)
+      || (nodeAtom == nsEditProperty::strike)
+      || (nodeAtom == nsEditProperty::big)
+      || (nodeAtom == nsEditProperty::small)
+      || (nodeAtom == nsEditProperty::sub)
+      || (nodeAtom == nsEditProperty::sup)
+      || (nodeAtom == nsEditProperty::font);
+}
+
+///////////////////////////////////////////////////////////////////////////
+// IsFormatNode true if node is a format node
+// 
+bool
+nsHTMLEditUtils::IsFormatNode(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsFormatNode");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsFormatNode(node);
+}
+
+bool
+nsHTMLEditUtils::IsFormatNode(nsINode* aNode)
+{
+  MOZ_ASSERT(aNode);
+  nsIAtom* nodeAtom = aNode->Tag();
+  return (nodeAtom == nsEditProperty::p)
+      || (nodeAtom == nsEditProperty::pre)
+      || (nodeAtom == nsEditProperty::h1)
+      || (nodeAtom == nsEditProperty::h2)
+      || (nodeAtom == nsEditProperty::h3)
+      || (nodeAtom == nsEditProperty::h4)
+      || (nodeAtom == nsEditProperty::h5)
+      || (nodeAtom == nsEditProperty::h6)
+      || (nodeAtom == nsEditProperty::address);
+}
+
+///////////////////////////////////////////////////////////////////////////
+// IsNodeThatCanOutdent true if node is a list, list item, or blockquote      
+//
+bool
+nsHTMLEditUtils::IsNodeThatCanOutdent(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsNodeThatCanOutdent");
+  nsCOMPtr<nsIAtom> nodeAtom = nsEditor::GetTag(aNode);
+  return (nodeAtom == nsEditProperty::ul)
+      || (nodeAtom == nsEditProperty::ol)
+      || (nodeAtom == nsEditProperty::dl)
+      || (nodeAtom == nsEditProperty::li)
+      || (nodeAtom == nsEditProperty::dd)
+      || (nodeAtom == nsEditProperty::dt)
+      || (nodeAtom == nsEditProperty::blockquote);
+}
+
+///////////////////////////////////////////////////////////////////////////
+//                  
+bool 
+nsHTMLEditUtils::IsSmall(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::small);
+}
+
+
+/********************************************************
+ *  helper methods from nsHTMLEditRules
+ ********************************************************/
+ 
+///////////////////////////////////////////////////////////////////////////
+// IsHeader: true if node an html header
+//                  
+bool 
+nsHTMLEditUtils::IsHeader(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsHeader");
+  nsCOMPtr<nsIAtom> nodeAtom = nsEditor::GetTag(aNode);
+  return (nodeAtom == nsEditProperty::h1)
+      || (nodeAtom == nsEditProperty::h2)
+      || (nodeAtom == nsEditProperty::h3)
+      || (nodeAtom == nsEditProperty::h4)
+      || (nodeAtom == nsEditProperty::h5)
+      || (nodeAtom == nsEditProperty::h6);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsParagraph: true if node an html paragraph
+//                  
+bool 
+nsHTMLEditUtils::IsParagraph(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::p);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsHR: true if node an horizontal rule
+//                  
+bool 
+nsHTMLEditUtils::IsHR(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::hr);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsListItem: true if node an html list item
+//                  
+bool 
+nsHTMLEditUtils::IsListItem(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsListItem");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsListItem(node);
+}
+
+bool
+nsHTMLEditUtils::IsListItem(nsINode* node)
+{
+  MOZ_ASSERT(node);
+  nsCOMPtr<nsIAtom> nodeAtom = node->Tag();
+  return (nodeAtom == nsEditProperty::li)
+      || (nodeAtom == nsEditProperty::dd)
+      || (nodeAtom == nsEditProperty::dt);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsTableElement: true if node an html table, td, tr, ...
+//                  
+bool
+nsHTMLEditUtils::IsTableElement(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null node passed to nsHTMLEditor::IsTableElement");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsTableElement(node);
+}
+
+bool
+nsHTMLEditUtils::IsTableElement(nsINode* node)
+{
+  MOZ_ASSERT(node);
+  nsCOMPtr<nsIAtom> nodeAtom = node->Tag();
+  return (nodeAtom == nsEditProperty::table)
+      || (nodeAtom == nsEditProperty::tr)
+      || (nodeAtom == nsEditProperty::td)
+      || (nodeAtom == nsEditProperty::th)
+      || (nodeAtom == nsEditProperty::thead)
+      || (nodeAtom == nsEditProperty::tfoot)
+      || (nodeAtom == nsEditProperty::tbody)
+      || (nodeAtom == nsEditProperty::caption);
+}
+
+///////////////////////////////////////////////////////////////////////////
+// IsTableElementButNotTable: true if node an html td, tr, ... (doesn't include table)
+//                  
+bool 
+nsHTMLEditUtils::IsTableElementButNotTable(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null node passed to nsHTMLEditor::IsTableElementButNotTable");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsTableElementButNotTable(node);
+}
+
+bool
+nsHTMLEditUtils::IsTableElementButNotTable(nsINode* aNode)
+{
+  MOZ_ASSERT(aNode);
+  nsCOMPtr<nsIAtom> nodeAtom = aNode->Tag();
+  return (nodeAtom == nsEditProperty::tr)
+      || (nodeAtom == nsEditProperty::td)
+      || (nodeAtom == nsEditProperty::th)
+      || (nodeAtom == nsEditProperty::thead)
+      || (nodeAtom == nsEditProperty::tfoot)
+      || (nodeAtom == nsEditProperty::tbody)
+      || (nodeAtom == nsEditProperty::caption);
+}
+
+///////////////////////////////////////////////////////////////////////////
+// IsTable: true if node an html table
+//                  
+bool 
+nsHTMLEditUtils::IsTable(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::table);
+}
+
+///////////////////////////////////////////////////////////////////////////
+// IsTableRow: true if node an html tr
+//                  
+bool 
+nsHTMLEditUtils::IsTableRow(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::tr);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsTableCell: true if node an html td or th
+//                  
+bool 
+nsHTMLEditUtils::IsTableCell(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsTableCell");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsTableCell(node);
+}
+
+bool
+nsHTMLEditUtils::IsTableCell(nsINode* node)
+{
+  MOZ_ASSERT(node);
+  nsCOMPtr<nsIAtom> nodeAtom = node->Tag();
+  return (nodeAtom == nsEditProperty::td)
+      || (nodeAtom == nsEditProperty::th);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsTableCell: true if node an html td or th
+//                  
+bool 
+nsHTMLEditUtils::IsTableCellOrCaption(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsTableCell");
+  nsCOMPtr<nsIAtom> nodeAtom = nsEditor::GetTag(aNode);
+  return (nodeAtom == nsEditProperty::td)
+      || (nodeAtom == nsEditProperty::th)
+      || (nodeAtom == nsEditProperty::caption);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsList: true if node an html list
+//                  
+bool
+nsHTMLEditUtils::IsList(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsList");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsList(node);
+}
+
+bool
+nsHTMLEditUtils::IsList(nsINode* node)
+{
+  MOZ_ASSERT(node);
+  nsCOMPtr<nsIAtom> nodeAtom = node->Tag();
+  return (nodeAtom == nsEditProperty::ul)
+      || (nodeAtom == nsEditProperty::ol)
+      || (nodeAtom == nsEditProperty::dl);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsOrderedList: true if node an html ordered list
+//                  
+bool 
+nsHTMLEditUtils::IsOrderedList(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::ol);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsUnorderedList: true if node an html unordered list
+//                  
+bool 
+nsHTMLEditUtils::IsUnorderedList(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::ul);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsBlockquote: true if node an html blockquote node
+//                  
+bool 
+nsHTMLEditUtils::IsBlockquote(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::blockquote);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsPre: true if node an html pre node
+//                  
+bool 
+nsHTMLEditUtils::IsPre(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::pre);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsImage: true if node an html image node
+//                  
+bool 
+nsHTMLEditUtils::IsImage(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::img);
+}
+
+bool 
+nsHTMLEditUtils::IsLink(nsIDOMNode *aNode)
+{
+  NS_ENSURE_TRUE(aNode, false);
+  nsCOMPtr<nsIDOMHTMLAnchorElement> anchor = do_QueryInterface(aNode);
+  if (anchor)
+  {
+    nsAutoString tmpText;
+    if (NS_SUCCEEDED(anchor->GetHref(tmpText)) && !tmpText.IsEmpty())
+      return true;
+  }
+  return false;
+}
+
+bool 
+nsHTMLEditUtils::IsNamedAnchor(nsIDOMNode *aNode)
+{
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsNamedAnchor(node);
+}
+
+bool
+nsHTMLEditUtils::IsNamedAnchor(nsINode* aNode)
+{
+  MOZ_ASSERT(aNode);
+  if (!aNode->IsElement() || !aNode->AsElement()->IsHTML(nsGkAtoms::a)) {
+    return false;
+  }
+
+  nsAutoString text;
+  return aNode->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::name,
+                                     text) && !text.IsEmpty();
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsDiv: true if node an html div node
+//                  
+bool 
+nsHTMLEditUtils::IsDiv(nsIDOMNode* aNode)
+{
+  return nsEditor::NodeIsType(aNode, nsEditProperty::div);
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsMozDiv: true if node an html div node with type = _moz
+//                  
+bool 
+nsHTMLEditUtils::IsMozDiv(nsIDOMNode* aNode)
+{
+  if (IsDiv(aNode) && nsTextEditUtils::HasMozAttr(aNode)) return true;
+  return false;
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsMailCite: true if node an html blockquote with type=cite
+//                  
+bool
+nsHTMLEditUtils::IsMailCite(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null parent passed to nsHTMLEditUtils::IsMailCite");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsMailCite(node);
+}
+
+bool
+nsHTMLEditUtils::IsMailCite(nsINode* aNode)
+{
+  MOZ_ASSERT(aNode);
+
+  // don't ask me why, but our html mailcites are id'd by "type=cite"...
+  if (aNode->IsElement() &&
+      aNode->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                                      NS_LITERAL_STRING("cite"),
+                                      eIgnoreCase)) {
+    return true;
+  }
+
+  // ... but our plaintext mailcites by "_moz_quote=true".  go figure.
+  if (aNode->IsElement() &&
+      aNode->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::mozquote,
+                                      NS_LITERAL_STRING("true"),
+                                      eIgnoreCase)) {
+    return true;
+  }
+
+  return false;
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+// IsFormWidget: true if node is a form widget of some kind
+//                  
+bool
+nsHTMLEditUtils::IsFormWidget(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null node passed to nsHTMLEditUtils::IsFormWidget");
+  nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+  return node && IsFormWidget(node);
+}
+
+bool
+nsHTMLEditUtils::IsFormWidget(nsINode* aNode)
+{
+  MOZ_ASSERT(aNode);
+  nsCOMPtr<nsIAtom> nodeAtom = aNode->Tag();
+  return (nodeAtom == nsEditProperty::textarea)
+      || (nodeAtom == nsEditProperty::select)
+      || (nodeAtom == nsEditProperty::button)
+      || (nodeAtom == nsEditProperty::output)
+      || (nodeAtom == nsEditProperty::keygen)
+      || (nodeAtom == nsEditProperty::progress)
+      || (nodeAtom == nsEditProperty::meter)
+      || (nodeAtom == nsEditProperty::input);
+}
+
+bool
+nsHTMLEditUtils::SupportsAlignAttr(nsIDOMNode* aNode)
+{
+  NS_PRECONDITION(aNode, "null node passed to nsHTMLEditUtils::SupportsAlignAttr");
+  nsCOMPtr<nsIAtom> nodeAtom = nsEditor::GetTag(aNode);
+  return (nodeAtom == nsEditProperty::hr)
+      || (nodeAtom == nsEditProperty::table)
+      || (nodeAtom == nsEditProperty::tbody)
+      || (nodeAtom == nsEditProperty::tfoot)
+      || (nodeAtom == nsEditProperty::thead)
+      || (nodeAtom == nsEditProperty::tr)
+      || (nodeAtom == nsEditProperty::td)
+      || (nodeAtom == nsEditProperty::th)
+      || (nodeAtom == nsEditProperty::div)
+      || (nodeAtom == nsEditProperty::p)
+      || (nodeAtom == nsEditProperty::h1)
+      || (nodeAtom == nsEditProperty::h2)
+      || (nodeAtom == nsEditProperty::h3)
+      || (nodeAtom == nsEditProperty::h4)
+      || (nodeAtom == nsEditProperty::h5)
+      || (nodeAtom == nsEditProperty::h6);
+}
+
+// We use bitmasks to test containment of elements. Elements are marked to be
+// in certain groups by setting the mGroup member of the nsElementInfo struct
+// to the corresponding GROUP_ values (OR'ed together). Similarly, elements are
+// marked to allow containment of certain groups by setting the
+// mCanContainGroups member of the nsElementInfo struct to the corresponding
+// GROUP_ values (OR'ed together).
+// Testing containment then simply consists of checking whether the
+// mCanContainGroups bitmask of an element and the mGroup bitmask of a
+// potential child overlap.
+
+#define GROUP_NONE             0
+
+// body, head, html
+#define GROUP_TOPLEVEL         (1 << 1)  
+
+// base, link, meta, script, style, title
+#define GROUP_HEAD_CONTENT     (1 << 2)
+
+// b, big, i, s, small, strike, tt, u
+#define GROUP_FONTSTYLE        (1 << 3)
+
+// abbr, acronym, cite, code, datalist, del, dfn, em, ins, kbd, mark, samp,
+// strong, var
+#define GROUP_PHRASE           (1 << 4)
+
+// a, applet, basefont, bdo, br, font, iframe, img, map, meter, object, output,
+// progress, q, script, span, sub, sup
+#define GROUP_SPECIAL          (1 << 5)
+
+// button, form, input, label, select, textarea
+#define GROUP_FORMCONTROL      (1 << 6)
+
+// address, applet, article, aside, blockquote, button, center, del, dir, div,
+// dl, fieldset, figure, footer, form, h1, h2, h3, h4, h5, h6, header, hgroup,
+// hr, iframe, ins, main, map, menu, nav, noframes, noscript, object, ol, p,
+// pre, table, section, ul
+#define GROUP_BLOCK            (1 << 7)
+
+// frame, frameset
+#define GROUP_FRAME            (1 << 8)
+
+// col, tbody
+#define GROUP_TABLE_CONTENT    (1 << 9)
+
+// tr
+#define GROUP_TBODY_CONTENT    (1 << 10)
+
+// td, th
+#define GROUP_TR_CONTENT       (1 << 11)
+
+// col
+#define GROUP_COLGROUP_CONTENT (1 << 12)
+
+// param
+#define GROUP_OBJECT_CONTENT   (1 << 13)
+
+// li
+#define GROUP_LI               (1 << 14)
+
+// area
+#define GROUP_MAP_CONTENT      (1 << 15)
+
+// optgroup, option
+#define GROUP_SELECT_CONTENT   (1 << 16)
+
+// option
+#define GROUP_OPTIONS          (1 << 17)
+
+// dd, dt
+#define GROUP_DL_CONTENT       (1 << 18)
+
+// p
+#define GROUP_P                (1 << 19)
+
+// text, whitespace, newline, comment
+#define GROUP_LEAF             (1 << 20)
+
+// XXX This is because the editor does sublists illegally. 
+// ol, ul
+#define GROUP_OL_UL            (1 << 21)
+
+// h1, h2, h3, h4, h5, h6
+#define GROUP_HEADING          (1 << 22)
+
+// figcaption
+#define GROUP_FIGCAPTION       (1 << 23)
+
+#define GROUP_INLINE_ELEMENT \
+  (GROUP_FONTSTYLE | GROUP_PHRASE | GROUP_SPECIAL | GROUP_FORMCONTROL | \
+   GROUP_LEAF)
+
+#define GROUP_FLOW_ELEMENT (GROUP_INLINE_ELEMENT | GROUP_BLOCK)
+
+struct nsElementInfo
+{
+#ifdef DEBUG
+  eHTMLTags mTag;
+#endif
+  uint32_t mGroup;
+  uint32_t mCanContainGroups;
+  bool mIsContainer;
+  bool mCanContainSelf;
+};
+
+#ifdef DEBUG
+#define ELEM(_tag, _isContainer, _canContainSelf, _group, _canContainGroups) \
+  { eHTMLTag_##_tag, _group, _canContainGroups, _isContainer, _canContainSelf }
+#else
+#define ELEM(_tag, _isContainer, _canContainSelf, _group, _canContainGroups) \
+  { _group, _canContainGroups, _isContainer, _canContainSelf }
+#endif
+
+static const nsElementInfo kElements[eHTMLTag_userdefined] = {
+  ELEM(a, true, false, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(abbr, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(acronym, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(address, true, true, GROUP_BLOCK,
+       GROUP_INLINE_ELEMENT | GROUP_P),
+  ELEM(applet, true, true, GROUP_SPECIAL | GROUP_BLOCK,
+       GROUP_FLOW_ELEMENT | GROUP_OBJECT_CONTENT),
+  ELEM(area, false, false, GROUP_MAP_CONTENT, GROUP_NONE),
+  ELEM(article, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(aside, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(audio, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(b, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  ELEM(base, false, false, GROUP_HEAD_CONTENT, GROUP_NONE),
+  ELEM(basefont, false, false, GROUP_SPECIAL, GROUP_NONE),
+  ELEM(bdo, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(bgsound, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(big, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  ELEM(blockquote, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(body, true, true, GROUP_TOPLEVEL, GROUP_FLOW_ELEMENT),
+  ELEM(br, false, false, GROUP_SPECIAL, GROUP_NONE),
+  ELEM(button, true, true, GROUP_FORMCONTROL | GROUP_BLOCK,
+       GROUP_FLOW_ELEMENT),
+  ELEM(canvas, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(caption, true, true, GROUP_NONE, GROUP_INLINE_ELEMENT),
+  ELEM(center, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(cite, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(code, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(col, false, false, GROUP_TABLE_CONTENT | GROUP_COLGROUP_CONTENT,
+       GROUP_NONE),
+  ELEM(colgroup, true, false, GROUP_NONE, GROUP_COLGROUP_CONTENT),
+  ELEM(content, true, false, GROUP_NONE, GROUP_INLINE_ELEMENT),
+  ELEM(data, true, false, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(datalist, true, false, GROUP_PHRASE,
+       GROUP_OPTIONS | GROUP_INLINE_ELEMENT),
+  ELEM(dd, true, false, GROUP_DL_CONTENT, GROUP_FLOW_ELEMENT),
+  ELEM(del, true, true, GROUP_PHRASE | GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(dfn, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(dir, true, false, GROUP_BLOCK, GROUP_LI),
+  ELEM(div, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(dl, true, false, GROUP_BLOCK, GROUP_DL_CONTENT),
+  ELEM(dt, true, true, GROUP_DL_CONTENT, GROUP_INLINE_ELEMENT),
+  ELEM(em, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(embed, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(fieldset, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(figcaption, true, false, GROUP_FIGCAPTION, GROUP_FLOW_ELEMENT),
+  ELEM(figure, true, true, GROUP_BLOCK,
+       GROUP_FLOW_ELEMENT | GROUP_FIGCAPTION),
+  ELEM(font, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(footer, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(form, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(frame, false, false, GROUP_FRAME, GROUP_NONE),
+  ELEM(frameset, true, true, GROUP_FRAME, GROUP_FRAME),
+  ELEM(h1, true, false, GROUP_BLOCK | GROUP_HEADING,
+       GROUP_INLINE_ELEMENT),
+  ELEM(h2, true, false, GROUP_BLOCK | GROUP_HEADING,
+       GROUP_INLINE_ELEMENT),
+  ELEM(h3, true, false, GROUP_BLOCK | GROUP_HEADING,
+       GROUP_INLINE_ELEMENT),
+  ELEM(h4, true, false, GROUP_BLOCK | GROUP_HEADING,
+       GROUP_INLINE_ELEMENT),
+  ELEM(h5, true, false, GROUP_BLOCK | GROUP_HEADING,
+       GROUP_INLINE_ELEMENT),
+  ELEM(h6, true, false, GROUP_BLOCK | GROUP_HEADING,
+       GROUP_INLINE_ELEMENT),
+  ELEM(head, true, false, GROUP_TOPLEVEL, GROUP_HEAD_CONTENT),
+  ELEM(header, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(hgroup, true, false, GROUP_BLOCK, GROUP_HEADING),
+  ELEM(hr, false, false, GROUP_BLOCK, GROUP_NONE),
+  ELEM(html, true, false, GROUP_TOPLEVEL, GROUP_TOPLEVEL),
+  ELEM(i, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  ELEM(iframe, true, true, GROUP_SPECIAL | GROUP_BLOCK,
+       GROUP_FLOW_ELEMENT),
+  ELEM(image, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(img, false, false, GROUP_SPECIAL, GROUP_NONE),
+  ELEM(input, false, false, GROUP_FORMCONTROL, GROUP_NONE),
+  ELEM(ins, true, true, GROUP_PHRASE | GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(kbd, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(keygen, false, false, GROUP_FORMCONTROL, GROUP_NONE),
+  ELEM(label, true, false, GROUP_FORMCONTROL, GROUP_INLINE_ELEMENT),
+  ELEM(legend, true, true, GROUP_NONE, GROUP_INLINE_ELEMENT),
+  ELEM(li, true, false, GROUP_LI, GROUP_FLOW_ELEMENT),
+  ELEM(link, false, false, GROUP_HEAD_CONTENT, GROUP_NONE),
+  ELEM(listing, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(main, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(map, true, true, GROUP_SPECIAL, GROUP_BLOCK | GROUP_MAP_CONTENT),
+  ELEM(mark, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(marquee, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(menu, true, true, GROUP_BLOCK, GROUP_LI | GROUP_FLOW_ELEMENT),
+  ELEM(menuitem, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(meta, false, false, GROUP_HEAD_CONTENT, GROUP_NONE),
+  ELEM(meter, true, false, GROUP_SPECIAL, GROUP_FLOW_ELEMENT),
+  ELEM(multicol, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(nav, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(nobr, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(noembed, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(noframes, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(noscript, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(object, true, true, GROUP_SPECIAL | GROUP_BLOCK,
+       GROUP_FLOW_ELEMENT | GROUP_OBJECT_CONTENT),
+  // XXX Can contain self and ul because editor does sublists illegally.
+  ELEM(ol, true, true, GROUP_BLOCK | GROUP_OL_UL,
+       GROUP_LI | GROUP_OL_UL),
+  ELEM(optgroup, true, false, GROUP_SELECT_CONTENT,
+       GROUP_OPTIONS),
+  ELEM(option, true, false,
+       GROUP_SELECT_CONTENT | GROUP_OPTIONS, GROUP_LEAF),
+  ELEM(output, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(p, true, false, GROUP_BLOCK | GROUP_P, GROUP_INLINE_ELEMENT),
+  ELEM(param, false, false, GROUP_OBJECT_CONTENT, GROUP_NONE),
+  ELEM(plaintext, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(pre, true, true, GROUP_BLOCK, GROUP_INLINE_ELEMENT),
+  ELEM(progress, true, false, GROUP_SPECIAL, GROUP_FLOW_ELEMENT),
+  ELEM(q, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(s, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  ELEM(samp, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(script, true, false, GROUP_HEAD_CONTENT | GROUP_SPECIAL,
+       GROUP_LEAF),
+  ELEM(section, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
+  ELEM(select, true, false, GROUP_FORMCONTROL, GROUP_SELECT_CONTENT),
+  ELEM(shadow, true, false, GROUP_NONE, GROUP_INLINE_ELEMENT),
+  ELEM(small, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  ELEM(source, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(span, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(strike, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  ELEM(strong, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(style, true, false, GROUP_HEAD_CONTENT, GROUP_LEAF),
+  ELEM(sub, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(sup, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
+  ELEM(table, true, false, GROUP_BLOCK, GROUP_TABLE_CONTENT),
+  ELEM(tbody, true, false, GROUP_TABLE_CONTENT, GROUP_TBODY_CONTENT),
+  ELEM(td, true, false, GROUP_TR_CONTENT, GROUP_FLOW_ELEMENT),
+  ELEM(textarea, true, false, GROUP_FORMCONTROL, GROUP_LEAF),
+  ELEM(tfoot, true, false, GROUP_NONE, GROUP_TBODY_CONTENT),
+  ELEM(th, true, false, GROUP_TR_CONTENT, GROUP_FLOW_ELEMENT),
+  ELEM(thead, true, false, GROUP_NONE, GROUP_TBODY_CONTENT),
+  ELEM(template, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(time, true, false, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(title, true, false, GROUP_HEAD_CONTENT, GROUP_LEAF),
+  ELEM(tr, true, false, GROUP_TBODY_CONTENT, GROUP_TR_CONTENT),
+  ELEM(track, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(tt, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  ELEM(u, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
+  // XXX Can contain self and ol because editor does sublists illegally.
+  ELEM(ul, true, true, GROUP_BLOCK | GROUP_OL_UL,
+       GROUP_LI | GROUP_OL_UL),
+  ELEM(var, true, true, GROUP_PHRASE, GROUP_INLINE_ELEMENT),
+  ELEM(video, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(wbr, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(xmp, false, false, GROUP_NONE, GROUP_NONE),
+
+  // These aren't elements.
+  ELEM(text, false, false, GROUP_LEAF, GROUP_NONE),
+  ELEM(whitespace, false, false, GROUP_LEAF, GROUP_NONE),
+  ELEM(newline, false, false, GROUP_LEAF, GROUP_NONE),
+  ELEM(comment, false, false, GROUP_LEAF, GROUP_NONE),
+  ELEM(entity, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(doctypeDecl, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(markupDecl, false, false, GROUP_NONE, GROUP_NONE),
+  ELEM(instruction, false, false, GROUP_NONE, GROUP_NONE),
+
+  ELEM(userdefined, true, false, GROUP_NONE, GROUP_FLOW_ELEMENT)
+};
+
+bool
+nsHTMLEditUtils::CanContain(int32_t aParent, int32_t aChild)
+{
+  NS_ASSERTION(aParent > eHTMLTag_unknown && aParent <= eHTMLTag_userdefined,
+               "aParent out of range!");
+  NS_ASSERTION(aChild > eHTMLTag_unknown && aChild <= eHTMLTag_userdefined,
+               "aChild out of range!");
+
+#ifdef DEBUG
+  static bool checked = false;
+  if (!checked) {
+    checked = true;
+    int32_t i;
+    for (i = 1; i <= eHTMLTag_userdefined; ++i) {
+      NS_ASSERTION(kElements[i - 1].mTag == i,
+                   "You need to update kElements (missing tags).");
+    }
+  }
+#endif
+
+  // Special-case button.
+  if (aParent == eHTMLTag_button) {
+    static const eHTMLTags kButtonExcludeKids[] = {
+      eHTMLTag_a,
+      eHTMLTag_fieldset,
+      eHTMLTag_form,
+      eHTMLTag_iframe,
+      eHTMLTag_input,
+      eHTMLTag_select,
+      eHTMLTag_textarea
+    };
+
+    uint32_t j;
+    for (j = 0; j < ArrayLength(kButtonExcludeKids); ++j) {
+      if (kButtonExcludeKids[j] == aChild) {
+        return false;
+      }
+    }
+  }
+
+  // Deprecated elements.
+  if (aChild == eHTMLTag_bgsound) {
+    return false;
+  }
+
+  // Bug #67007, dont strip userdefined tags.
+  if (aChild == eHTMLTag_userdefined) {
+    return true;
+  }
+
+  const nsElementInfo& parent = kElements[aParent - 1];
+  if (aParent == aChild) {
+    return parent.mCanContainSelf;
+  }
+
+  const nsElementInfo& child = kElements[aChild - 1];
+  return (parent.mCanContainGroups & child.mGroup) != 0;
+} 
+
+bool
+nsHTMLEditUtils::IsContainer(int32_t aTag)
+{
+  NS_ASSERTION(aTag > eHTMLTag_unknown && aTag <= eHTMLTag_userdefined,
+               "aTag out of range!");
+
+  return kElements[aTag - 1].mIsContainer;
+}