private NavigationPoint ProcessNavPoint(
XElement element, NavigationOrderProcessor orderProcessor, string basePath, IEnumerable <File> files)
{
var title = element.Elements()
.Single(e => e.Name.Equals(XmlNamespaces.Ncx + NcxXmlNames.NavLabelElementName))
.Elements().Single(e => e.Name.Equals(XmlNamespaces.Ncx + NcxXmlNames.TextElementName))
.Value;
var contentText = element.Elements()
.Single(e => e.Name.Equals(XmlNamespaces.Ncx + NcxXmlNames.ContentElementName))
.GetAttributeValueOrNull(NcxXmlNames.SrcAttributeName) !;
var filePath = SrcTextSplitter.GetFileName(contentText);
var elementId = SrcTextSplitter.GetElementId(contentText);
var fileFullPath = EpubPathHelper.ExpandPath(basePath, filePath);
var file = files.Single(f => f.Path.EqualsIgnoreCaseWithNull(fileFullPath));
var order = orderProcessor.GetOrder(element);
var children = FilterAndSelectChildNavPoints(element, orderProcessor, basePath, files);
return(new NavigationPoint(title, file, elementId, order, children));
}
private NavigationPoint ProcessListItemRecursive(
XElement listItem, NavigationOrderProcessor navigationOrderProcessor, string basePath, IEnumerable <File> files)
{
var linkElement = listItem.Elements()
.Single(element => element.Name.Equals(XmlNamespaces.XHtml + XHtmlTocXmlNames.LinkElementName));
var title = linkElement.Value;
var srcPath = linkElement.GetAttributeValueOrNull(XHtmlTocXmlNames.HrefAttributeName) !;
var filePath = SrcTextSplitter.GetFileName(srcPath);
var elementId = SrcTextSplitter.GetElementId(srcPath);
var order = navigationOrderProcessor.GetOrder(listItem);
var fileFullPath = EpubPathHelper.ExpandPath(basePath, filePath);
var file = files.Single(f => f.Path.EqualsIgnoreCaseWithNull(fileFullPath));
var childOrderedList = listItem.Elements()
.Cast <XElement?>().SingleOrDefault(
e => e !.Name.Equals(XmlNamespaces.XHtml + XHtmlTocXmlNames.OrderedListElementName));
var children = childOrderedList != null
? ProcessOrderedListRecursive(childOrderedList, navigationOrderProcessor, basePath, files).ToArray()
: Array.Empty <NavigationPoint>();
return(new NavigationPoint(title, file, elementId, order, children));
}