private static List <EpubNavigationItemRef> GetNavigationItems(EpubBookRef bookRef, Epub3NavOl epub3NavOl)
{
List <EpubNavigationItemRef> result = new List <EpubNavigationItemRef>();
if (epub3NavOl != null && epub3NavOl.Lis != null)
{
foreach (Epub3NavLi epub3NavLi in epub3NavOl.Lis)
{
if (epub3NavLi != null && (epub3NavLi.Anchor != null || epub3NavLi.Span != null))
{
if (epub3NavLi.Anchor != null)
{
Epub3NavAnchor navAnchor = epub3NavLi.Anchor;
EpubNavigationItemRef navigationItemRef = EpubNavigationItemRef.CreateAsLink();
navigationItemRef.Title = GetFirstNonEmptyHeader(navAnchor.Text, navAnchor.Title, navAnchor.Alt);
navigationItemRef.Link = new EpubNavigationItemLink(navAnchor.Href);
navigationItemRef.HtmlContentFileRef = GetHtmlContentFileRef(bookRef, navigationItemRef.Link.ContentFileName);
navigationItemRef.NestedItems = GetNavigationItems(bookRef, epub3NavLi.ChildOl);
result.Add(navigationItemRef);
}
else if (epub3NavLi.Span != null)
{
Epub3NavSpan navSpan = epub3NavLi.Span;
EpubNavigationItemRef navigationItemRef = EpubNavigationItemRef.CreateAsHeader();
navigationItemRef.Title = GetFirstNonEmptyHeader(navSpan.Text, navSpan.Title, navSpan.Alt);
navigationItemRef.NestedItems = GetNavigationItems(bookRef, epub3NavLi.ChildOl);
result.Add(navigationItemRef);
}
}
}
}
return(result);
}
private static List <EpubNavigationItemRef> GetNavigationItems(EpubBookRef bookRef, Epub3Nav epub3Nav)
{
List <EpubNavigationItemRef> result;
if (epub3Nav != null)
{
if (epub3Nav.Head != null)
{
result = new List <EpubNavigationItemRef>();
EpubNavigationItemRef navigationItemRef = EpubNavigationItemRef.CreateAsHeader();
navigationItemRef.Title = epub3Nav.Head;
navigationItemRef.NestedItems = GetNavigationItems(bookRef, epub3Nav.Ol);
result.Add(navigationItemRef);
}
else
{
result = GetNavigationItems(bookRef, epub3Nav.Ol);
}
}
else
{
result = new List <EpubNavigationItemRef>();
}
return(result);
}