/// <summary>
/// Searches through the provided document for a start and end comment marker and then returns the fragment as
/// a MarkupRange.
/// </summary>
/// <param name="document">The document to search.</param>
/// <param name="startMarker">The comment text that marks the start of the fragment
/// (e.g. <!--StartFragment--> ).</param>
/// <param name="endMarker">The comment text that marks the end of the fragment
/// (e.g. <!--EndFragment--> ).</param>
/// <returns>The fragment as a MarkupRange or null if no valid fragment was found.</returns>
private MarkupRange FindMarkedFragment(IHTMLDocument2 document, string startMarker, string endMarker)
{
MarkupPointer startFragment = null;
MarkupPointer endFragment = null;
MshtmlMarkupServices markupServices = new MshtmlMarkupServices((IMarkupServicesRaw)document);
// Look for the markers in the document.
foreach (IHTMLElement element in document.all)
{
if (element is IHTMLCommentElement && ((IHTMLCommentElement)element).text == startMarker)
{
startFragment = markupServices.CreateMarkupPointer(element, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
}
else if (element is IHTMLCommentElement && ((IHTMLCommentElement)element).text == endMarker)
{
endFragment = markupServices.CreateMarkupPointer(element, _ELEMENT_ADJACENCY.ELEM_ADJ_BeforeBegin);
}
}
if (startFragment == null || endFragment == null || !startFragment.Positioned || !endFragment.Positioned ||
startFragment.IsRightOf(endFragment))
{
Trace.WriteLine("Unable to find fragment or invalid fragment!");
return(null);
}
// WinLive 251786: IE (and most other browsers) allow HTML like the following:
// <p>This is a paragraph[cursor]
// <p>This is a paragraph
// However, when we use MarkupPointers to walk through this HTML, IE pretends there is a </p> at the end
// of each of the above lines. This can cause issues when we copy part of this HTML somewhere else (e.g
// everything after the [cursor]) and attempt to walk through both copies (e.g. during paste with keep
// source formatting) at the same time. This holds true for some other elements, such as <li>s and <td>s.
MarkupContext startContext = startFragment.Right(false);
if (startFragment.IsLeftOf(endFragment) &&
startContext.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope &&
startContext.Element != null &&
ElementFilters.IsEndTagOptional(startContext.Element) &&
!Regex.IsMatch(startContext.Element.outerHTML,
String.Format(CultureInfo.InvariantCulture, @"</{0}(\s[^>]*)?>\s*$", startContext.Element.tagName),
RegexOptions.IgnoreCase | RegexOptions.CultureInvariant))
{
startFragment.Right(true);
}
return(markupServices.CreateMarkupRange(startFragment, endFragment));
}
