private static Epub2NcxNavigationPoint ReadNavigationPoint(XElement navigationPointNode)
{
Epub2NcxNavigationPoint result = new Epub2NcxNavigationPoint();
foreach (XAttribute navigationPointNodeAttribute in navigationPointNode.Attributes())
{
string attributeValue = navigationPointNodeAttribute.Value;
switch (navigationPointNodeAttribute.GetLowerCaseLocalName())
{
case "id":
result.Id = attributeValue;
break;
case "class":
result.Class = attributeValue;
break;
case "playorder":
result.PlayOrder = attributeValue;
break;
}
}
if (String.IsNullOrWhiteSpace(result.Id))
{
throw new Exception("Incorrect EPUB navigation point: point ID is missing.");
}
result.NavigationLabels = new List <Epub2NcxNavigationLabel>();
result.ChildNavigationPoints = new List <Epub2NcxNavigationPoint>();
foreach (XElement navigationPointChildNode in navigationPointNode.Elements())
{
switch (navigationPointChildNode.GetLowerCaseLocalName())
{
case "navlabel":
Epub2NcxNavigationLabel navigationLabel = ReadNavigationLabel(navigationPointChildNode);
result.NavigationLabels.Add(navigationLabel);
break;
case "content":
Epub2NcxContent content = ReadNavigationContent(navigationPointChildNode);
result.Content = content;
break;
case "navpoint":
Epub2NcxNavigationPoint childNavigationPoint = ReadNavigationPoint(navigationPointChildNode);
result.ChildNavigationPoints.Add(childNavigationPoint);
break;
}
}
if (!result.NavigationLabels.Any())
{
throw new Exception($"EPUB parsing error: navigation point {result.Id} should contain at least one navigation label.");
}
if (result.Content == null)
{
throw new Exception($"EPUB parsing error: navigation point {result.Id} should contain content.");
}
return(result);
}
private static Epub2NcxNavigationMap ReadNavigationMap(XElement navigationMapNode)
{
Epub2NcxNavigationMap result = new Epub2NcxNavigationMap();
foreach (XElement navigationPointNode in navigationMapNode.Elements())
{
if (navigationPointNode.CompareNameTo("navPoint"))
{
Epub2NcxNavigationPoint navigationPoint = ReadNavigationPoint(navigationPointNode);
result.Add(navigationPoint);
}
}
return(result);
}
