gecko-dev/editor/libeditor/html/nsHTMLEditUtils.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

#include "nsHTMLEditUtils.h"

#include "nsString.h"
#include "nsEditor.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"

/********************************************************
 *  helper methods from nsTextEditRules
 ********************************************************/
 
///////////////////////////////////////////////////////////////////////////
// IsBody: true if node an html body node
//                  
PRBool 
nsHTMLEditUtils::IsBody(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null node passed to nsHTMLEditUtils::IsBody");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "body")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}



///////////////////////////////////////////////////////////////////////////
// IsBreak: true if node an html break node
//                  
PRBool 
nsHTMLEditUtils::IsBreak(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null node passed to nsHTMLEditUtils::IsBreak");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "br")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsBreak: true if node an html break node
//                  
PRBool 
nsHTMLEditUtils::IsBig(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null node passed to nsHTMLEditUtils::IsBig");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "big")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsBreak: true if node an html break node
//                  
PRBool 
nsHTMLEditUtils::IsSmall(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null node passed to nsHTMLEditUtils::IsSmall");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "small")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsMozBR: true if node an html br node with type = _moz
//                  
PRBool 
nsHTMLEditUtils::IsMozBR(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null node passed to nsHTMLEditUtils::IsMozBR");
  if (IsBreak(node) && HasMozAttr(node)) return PR_TRUE;
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// HasMozAttr: true if node has type attribute = _moz
//             (used to indicate the div's and br's we use in
//              mail compose rules)
//                  
PRBool 
nsHTMLEditUtils::HasMozAttr(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::HasMozAttr");
  nsCOMPtr<nsIDOMElement> elem = do_QueryInterface(node);
  if (elem)
  {
    nsAutoString typeAttrName("type");
    nsAutoString typeAttrVal;
    nsresult res = elem->GetAttribute(typeAttrName, typeAttrVal);
    typeAttrVal.ToLowerCase();
    if (NS_SUCCEEDED(res) && (typeAttrVal == "_moz"))
      return PR_TRUE;
  }
  return PR_FALSE;
}

///////////////////////////////////////////////////////////////////////////
// InBody: true if node is a descendant of the body
//                  
PRBool 
nsHTMLEditUtils::InBody(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::InBody");
  nsCOMPtr<nsIDOMNode> tmp;
  nsCOMPtr<nsIDOMNode> p = do_QueryInterface(node);

  while (p && !IsBody(p))
  {
    if ( NS_FAILED(p->GetParentNode(getter_AddRefs(tmp))) || !tmp) // no parent, ran off top of tree
      return PR_FALSE;
    p = tmp;
  }
  if (p) return PR_TRUE;
  return PR_FALSE;
}


/********************************************************
 *  helper methods from nsHTMLEditRules
 ********************************************************/
 
///////////////////////////////////////////////////////////////////////////
// IsHeader: true if node an html header
//                  
PRBool 
nsHTMLEditUtils::IsHeader(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsHeader");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if ( (tag == "h1") ||
       (tag == "h2") ||
       (tag == "h3") ||
       (tag == "h4") ||
       (tag == "h5") ||
       (tag == "h6") )
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsParagraph: true if node an html paragraph
//                  
PRBool 
nsHTMLEditUtils::IsParagraph(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsParagraph");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "p")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsListItem: true if node an html list item
//                  
PRBool 
nsHTMLEditUtils::IsListItem(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsListItem");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "li")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsTableCell: true if node an html td or th
//                  
PRBool 
nsHTMLEditUtils::IsTableRow(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsTableRow");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "tr")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsTableCell: true if node an html td or th
//                  
PRBool 
nsHTMLEditUtils::IsTableCell(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsTableCell");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "td" || tag == "th")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsList: true if node an html list
//                  
PRBool 
nsHTMLEditUtils::IsList(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsList");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if ( (tag == "ol") ||
       (tag == "ul") )
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsOrderedList: true if node an html orderd list
//                  
PRBool 
nsHTMLEditUtils::IsOrderedList(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsOrderedList");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "ol")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsUnorderedList: true if node an html orderd list
//                  
PRBool 
nsHTMLEditUtils::IsUnorderedList(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsUnorderedList");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "ul")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsBlockquote: true if node an html blockquote node
//                  
PRBool 
nsHTMLEditUtils::IsBlockquote(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsBlockquote");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "blockquote")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsAnchor: true if node an html anchor node
//                  
PRBool 
nsHTMLEditUtils::IsAnchor(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsAnchor");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "a")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsImage: true if node an html image node
//                  
PRBool 
nsHTMLEditUtils::IsImage(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null node passed to nsHTMLEditUtils::IsImage");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "img")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsDiv: true if node an html div node
//                  
PRBool 
nsHTMLEditUtils::IsDiv(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsDiv");
  nsAutoString tag;
  nsEditor::GetTagString(node,tag);
  tag.ToLowerCase();
  if (tag == "div")
  {
    return PR_TRUE;
  }
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsNormalDiv: true if node an html div node, without type = _moz
//                  
PRBool 
nsHTMLEditUtils::IsNormalDiv(nsIDOMNode *node)
{
  if (IsDiv(node) && !nsHTMLEditUtils::HasMozAttr(node)) return PR_TRUE;
  return PR_FALSE;
}


///////////////////////////////////////////////////////////////////////////
// IsMozDiv: true if node an html div node with type = _moz
//                  
PRBool 
nsHTMLEditUtils::IsMozDiv(nsIDOMNode *node)
{
  if (IsDiv(node) && HasMozAttr(node)) return PR_TRUE;
  return PR_FALSE;
}



///////////////////////////////////////////////////////////////////////////
// IsMailCite: true if node an html blockquote with type=cite
//                  
PRBool 
nsHTMLEditUtils::IsMailCite(nsIDOMNode *node)
{
  NS_PRECONDITION(node, "null parent passed to nsHTMLEditUtils::IsMailCite");
  if (IsBlockquote(node))
  {
    nsCOMPtr<nsIDOMElement> bqElem = do_QueryInterface(node);
    nsAutoString typeAttrName("type");
    nsAutoString typeAttrVal;
    nsresult res = bqElem->GetAttribute(typeAttrName, typeAttrVal);
    typeAttrVal.ToLowerCase();
    if (NS_SUCCEEDED(res))
    {
      if (typeAttrVal.Equals("cite", PR_TRUE, 4))
        return PR_TRUE;
    }
  }
  return PR_FALSE;
}


PRBool 
nsHTMLEditUtils::IsDescendantOf(nsIDOMNode *aNode, nsIDOMNode *aParent) 
{
  if (!aNode && !aParent) return PR_FALSE;
  if (aNode == aParent) return PR_FALSE;
  
  nsCOMPtr<nsIDOMNode> parent, node = do_QueryInterface(aNode);
  nsresult res;
  
  do
  {
    res = node->GetParentNode(getter_AddRefs(parent));
    if (NS_FAILED(res)) return PR_FALSE;
    if (parent.get() == aParent) return PR_TRUE;
    node = parent;
  } while (parent);
  
  return PR_FALSE;
}