private static List <EpubChapter> LoadChaptersFromNcx(string ncxAbsolutePath, IEnumerable <NcxNavPoint> navigationPoints, EpubChapter parentChapter = null)
{
var result = new List <EpubChapter>();
var previous = parentChapter;
foreach (var navigationPoint in navigationPoints)
{
var chapter = new EpubChapter
{
Title = navigationPoint.NavLabelText,
Parent = parentChapter,
Previous = previous
};
if (previous != null)
{
previous.Next = chapter;
}
var href = new Href(navigationPoint.ContentSrc);
chapter.RelativePath = href.Path;
chapter.AbsolutePath = href.Path.ToAbsolutePath(ncxAbsolutePath);
chapter.HashLocation = href.HashLocation;
chapter.SubChapters = LoadChaptersFromNcx(ncxAbsolutePath, navigationPoint.NavPoints, chapter);
result.Add(chapter);
previous = chapter.SubChapters.Any() ? chapter.SubChapters.Last() : chapter;
}
return(result);
}
private static List <EpubChapter> LoadChaptersFromNav(string navAbsolutePath, XElement element, EpubChapter parentChapter = null)
{
if (element == null)
{
throw new ArgumentNullException(nameof(element));
}
var ns = element.Name.Namespace;
var result = new List <EpubChapter>();
var previous = parentChapter;
var ol = element.Element(ns + NavElements.Ol);
if (ol == null)
{
return(result);
}
foreach (var li in ol.Elements(ns + NavElements.Li))
{
var chapter = new EpubChapter
{
Parent = parentChapter,
Previous = previous
};
if (previous != null)
{
previous.Next = chapter;
}
var link = li.Element(ns + NavElements.A);
if (link != null)
{
var id = link.Attribute("id")?.Value;
if (id != null)
{
chapter.Id = id;
}
var url = link.Attribute("href")?.Value;
if (url != null)
{
var href = new Href(url);
chapter.RelativePath = href.Path;
chapter.HashLocation = href.HashLocation;
chapter.AbsolutePath = chapter.RelativePath.ToAbsolutePath(navAbsolutePath);
}
var titleTextElement = li.Descendants().FirstOrDefault(e => !string.IsNullOrWhiteSpace(e.Value));
if (titleTextElement != null)
{
chapter.Title = titleTextElement.Value;
}
if (li.Element(ns + NavElements.Ol) != null)
{
chapter.SubChapters = LoadChaptersFromNav(navAbsolutePath, li, chapter);
}
result.Add(chapter);
previous = chapter.SubChapters.Any() ? chapter.SubChapters.Last() : chapter;
}
}
return(result);
}
