public static String ToFormattedHtml(MshtmlMarkupServices markupServices, MarkupRange bounds)
{
StringBuilder sb = new StringBuilder();
HtmlWriter xmlWriter = new HtmlWriter(sb);
PrintHtml(xmlWriter, markupServices, bounds);
return sb.ToString();
}
private static void PrintHtml(HtmlWriter writer, MshtmlMarkupServices MarkupServices, MarkupRange bounds)
{
//create a range to span a single position while walking the doc
MarkupRange range = MarkupServices.CreateMarkupRange();
range.Start.MoveToPointer(bounds.Start);
range.End.MoveToPointer(bounds.Start);
//create a context that can be reused while walking the document.
MarkupContext context = new MarkupContext();
//move the range.End to the right and print out each element along the way
range.End.Right(true, context);
while (context.Context != _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_None && range.Start.IsLeftOf(bounds.End))
{
string text = null;
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_Text)
{
//if this is a text context, then get the text that is between the start and end points.
text = range.HtmlText;
//the range.HtmlText operation sometimes returns the outer tags for a text node,
//so we need to strip the tags.
//FIXME: if the Right/Left operations returned the available text value, this wouldn't be necessary.
if (text != null)
text = StripSurroundingTags(text);
}
else if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope)
{
string htmlText = range.HtmlText;
if (context.Element.innerHTML == null && htmlText != null && htmlText.IndexOf(" ") != -1)
{
//HACK: Under these conditions, there was a was an invisible NBSP char in the
//document that is not detectable by walking through the document with MarkupServices.
//So, we force the text of the element to be the char to ensure that the
//whitespace that was visible in the editor is visible in the final document.
text = " ";
}
}
//print the context.
printContext(writer, context, text, range);
//move the start element to the spot where the end currently is so tht there is
//only ever a single difference in position
range.Start.MoveToPointer(range.End);
//move the end to the next position
range.End.Right(true, context);
}
}
/// <summary>
/// Utility for printing the correct XHTML for a given MarkupContext.
/// </summary>
/// <param name="writer"></param>
/// <param name="context"></param>
/// <param name="text"></param>
private static void printContext(HtmlWriter writer, MarkupContext context, string text, MarkupRange range)
{
switch (context.Context)
{
case _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope:
printElementStart(writer, context.Element);
if (HtmlLinebreakStripper.IsPreserveWhitespaceTag(context.Element.tagName))
{
// <pre> was losing whitespace using the normal markup pointer traversal method
writer.WriteString(BalanceHtml(context.Element.innerHTML));
printElementEnd(writer, context.Element);
range.End.MoveAdjacentToElement(context.Element, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
break;
}
else
{
if (text != null)
writer.WriteString(trimHtmlText(text));
break;
}
case _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope:
if (text != null)
writer.WriteString(trimHtmlText(text));
printElementEnd(writer, context.Element);
break;
case _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_None:
break;
case _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_NoScope:
if (context.Element is IHTMLCommentElement
|| context.Element is IHTMLUnknownElement)
{
//bugfix: 1777 - comments should just be inserted raw.
string html = context.Element.outerHTML;
// bugfix: 534222 - embed tag markup generation issues
if (html != null && html.ToUpper(CultureInfo.InvariantCulture) != "</EMBED>")
writer.WriteString(html);
}
else
{
printElementStart(writer, context.Element);
if (text == null && context.Element.innerHTML != null)
{
//Avoid MSHTML bug: in some cases (like title or script elements), MSHTML improperly
//reports a tag as being NoScope, even through it clearly has a start and end tag with
//text in between. To cover this case, we look for text in a noscope element, and add
//it to the XML stream if it is detected.
writer.WriteString(context.Element.innerHTML);
}
printElementEnd(writer, context.Element);
}
break;
case _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_Text:
if (text != null)
writer.WriteString(trimHtmlText(text));
break;
default:
break;
}
}
/// <summary>
/// Utility for properly printing the start tag for an element.
/// This utility takes care of including/suppresing attributes and namespaces properly.
/// </summary>
/// <param name="writer"></param>
/// <param name="element"></param>
private static void printElementStart(HtmlWriter writer, IHTMLElement element)
{
string tagName = element.tagName;
// If there is no tag name, this is mostly an artificial tag reported by mshtml,
// and not really present in the markup
// (e.g HTMLTableCaptionClass)
if (string.IsNullOrEmpty(tagName))
{
return;
}
//XHTML tags are all lowercase
tagName = tagName.ToLower(CultureInfo.InvariantCulture);
//this is a standard HTML tag, so just write it out.
writer.WriteStartElement(tagName);
IHTMLDOMNode node = element as IHTMLDOMNode;
IHTMLAttributeCollection attrs = node.attributes as IHTMLAttributeCollection;
if (attrs != null)
{
foreach (IHTMLDOMAttribute attr in attrs)
{
string attrName = attr.nodeName as string;
if (attr.specified)
{
string attrNameLower = attrName.ToLower(CultureInfo.InvariantCulture);
//get the raw attribute value (so that IE doesn't try to expand out paths in the value).
string attrValue = element.getAttribute(attrName, 2) as string;
if (attrValue == null)
{
//IE won't return some attributes (like class) using IHTMLElement.getAttribute(),
//so if the value is null, try to get the value directly from the DOM Attribute.
//Note: we can't use the DOM value by default, because IE will rewrite the value
//to contain a fully-qualified path on some attribures (like src and href).
attrValue = attr.nodeValue as string;
if (attrValue == null)
{
if ((attrNameLower == "hspace" || attrNameLower == "vspace") && attr.nodeValue is int)
{
attrValue = ((int)attr.nodeValue).ToString(CultureInfo.InvariantCulture);
}
else if (attrNameLower == "style")
{
//Avoid bug: Images that are resized with the editor insert a STYLE attribute.
//IE won't return the style attribute using the standard API, so we have to grab
//it from the style object
attrValue = element.style.cssText;
}
else if (attrNameLower == "colspan")
{
attrValue = (element as IHTMLTableCell).colSpan.ToString(CultureInfo.InvariantCulture);
}
else if (attrNameLower == "rowspan")
{
attrValue = (element as IHTMLTableCell).rowSpan.ToString(CultureInfo.InvariantCulture);
}
else if (attrNameLower == "align" && attr.nodeValue is int)
{
// This is not documented anywhere. Just discovered the values empirically on IE7 (Vista).
switch ((int)attr.nodeValue)
{
case 1:
attrValue = "left";
break;
case 2:
attrValue = "center";
break;
case 3:
attrValue = "right";
break;
case 4:
attrValue = "texttop";
break;
case 5:
attrValue = "absmiddle";
break;
case 6:
attrValue = "baseline";
break;
case 7:
attrValue = "absbottom";
break;
case 8:
attrValue = "bottom";
break;
case 9:
attrValue = "middle";
break;
case 10:
attrValue = "top";
break;
}
}
}
Debug.WriteLineIf(attrValue != null && attrName != "id", String.Format(CultureInfo.InvariantCulture, "{0}.{1} attribute value not retreived", tagName, attrName), element.outerHTML);
}
// Minimized attributes are not allowed, according
// to section 4.5 of XHTML 1.0 specification.
// TODO: Deal with simple values that are not strings
if (attrValue == null && attrNameLower != "id")
attrValue = attrName;
if (attrName != null && attrValue != null)
{
//write out this attribute.
writer.WriteAttributeString(attrName, attrValue);
}
}
}
}
}
/// <summary>
/// Utility for properly printing the end tag for an element.
/// This utility takes care of including/suppressing end tags for empty nodes properly.
/// </summary>
/// <param name="writer"></param>
/// <param name="element"></param>
private static void printElementEnd(HtmlWriter writer, IHTMLElement element)
{
// No tagName, no end tag.
if (string.IsNullOrEmpty(element.tagName))
{
return;
}
if (ElementFilters.RequiresEndTag(element))
{
writer.WriteEndElement(true);
}
else
{
writer.WriteEndElement(false);
}
}