private static EpubSpine ReadSpine(XElement spineNode, EpubVersion epubVersion)
{
EpubSpine result = new EpubSpine();
foreach (XAttribute spineNodeAttribute in spineNode.Attributes())
{
string attributeValue = spineNodeAttribute.Value;
switch (spineNodeAttribute.GetLowerCaseLocalName())
{
case "id":
result.Id = attributeValue;
break;
case "page-progression-direction":
result.PageProgressionDirection = PageProgressionDirectionParser.Parse(attributeValue);
break;
case "toc":
result.Toc = attributeValue;
break;
}
}
if (epubVersion == EpubVersion.EPUB_2 && String.IsNullOrWhiteSpace(result.Toc))
{
throw new Exception("Incorrect EPUB spine: TOC is missing");
}
foreach (XElement spineItemNode in spineNode.Elements())
{
if (spineItemNode.CompareNameTo("itemref"))
{
EpubSpineItemRef spineItemRef = new EpubSpineItemRef();
foreach (XAttribute spineItemNodeAttribute in spineItemNode.Attributes())
{
string attributeValue = spineItemNodeAttribute.Value;
switch (spineItemNodeAttribute.GetLowerCaseLocalName())
{
case "id":
spineItemRef.Id = attributeValue;
break;
case "idref":
spineItemRef.IdRef = attributeValue;
break;
case "properties":
spineItemRef.Properties = SpinePropertyParser.ParsePropertyList(attributeValue);
break;
}
}
if (String.IsNullOrWhiteSpace(spineItemRef.IdRef))
{
throw new Exception("Incorrect EPUB spine: item ID ref is missing");
}
XAttribute linearAttribute = spineItemNode.Attribute("linear");
spineItemRef.IsLinear = linearAttribute == null || !linearAttribute.CompareValueTo("no");
result.Add(spineItemRef);
}
}
return(result);
}