private static OpenXmlElement GetChildMc(this OpenXmlElement parent, OpenXmlElement child, MCContext mcContext, FileFormatVersions format)
{
// Use stack to cache the next siblings in different levels.
Stack <OpenXmlElement> nextSiblings = new Stack <OpenXmlElement>();
while (child != null)
{
var acb = child as AlternateContent;
if (acb == null && child.IsInVersion(format))
{
return(child);
}
else
{
mcContext.PushMCAttributes2(child.MCAttributes, child.LookupNamespace);
if (acb != null)
{
nextSiblings.Push(child.GetNextNonMiscElementSibling());
var select = mcContext.GetContentFromACBlock(acb, format);
if (select != null)
{
child = select.GetFirstNonMiscElementChild();
}
else
{
// The ACB has no children elements.
// case like: <acb/> <acb><choice/><fallback/></acb>
child = null;
}
}
else
{
// Ignorable element, skip it
if (mcContext.IsIgnorableNs(child.NamespaceUri))
{
// Any element marked with ProcessContent should be an Ignorable Element
if (mcContext.IsProcessContent(child))
{
nextSiblings.Push(child.GetNextNonMiscElementSibling());
//
child = child.GetFirstNonMiscElementChild();
}
else
{
child = child.GetNextNonMiscElementSibling();
}
}
else
{
mcContext.PopMCAttributes2();
return(child);
}
}
mcContext.PopMCAttributes2();
}
while (child == null && nextSiblings.Count > 0)
{
child = nextSiblings.Pop();
}
}
// child is null.
return(child);
}