private static async Task<EpubSpine> ReadSpineAsync(XmlReader reader)
{
EpubSpine result = new EpubSpine();
bool spineFound = await reader.ReadToFollowingAsync("spine", "http://www.idpf.org/2007/opf");
if (!spineFound)
throw new Exception("EPUB parsing error: spine declarations not found in the package.");
if (String.IsNullOrWhiteSpace(reader.GetAttribute("toc")))
throw new Exception("Incorrect EPUB spine: TOC attribute is missing or empty");
result.Toc = reader.GetAttribute("toc");
while (await reader.ReadAsync() && !(reader.NodeType == XmlNodeType.EndElement && reader.LocalName == "spine"))
{
if (reader.LocalName.ToLowerInvariant() == "itemref")
{
EpubSpineItemRef spineItemRef = new EpubSpineItemRef();
spineItemRef.IsLinear = true;
while (reader.MoveToNextAttribute())
{
switch (reader.LocalName.ToLowerInvariant())
{
case "idref":
spineItemRef.IdRef = reader.Value;
break;
case "linear":
if (reader.Value.ToLowerInvariant() == "no")
{
spineItemRef.IsLinear = false;
}
break;
}
}
result.Add(spineItemRef);
}
}
return result;
}
private static EpubSpine ReadSpine(XmlNode spineNode)
{
EpubSpine result = new EpubSpine();
XmlAttribute tocAttribute = spineNode.Attributes["toc"];
if (tocAttribute == null || String.IsNullOrWhiteSpace(tocAttribute.Value))
throw new Exception("Incorrect EPUB spine: TOC is missing");
result.Toc = tocAttribute.Value;
foreach (XmlNode spineItemNode in spineNode.ChildNodes)
if (String.Compare(spineItemNode.LocalName, "itemref", StringComparison.OrdinalIgnoreCase) == 0)
{
EpubSpineItemRef spineItemRef = new EpubSpineItemRef();
XmlAttribute idRefAttribute = spineItemNode.Attributes["idref"];
if (idRefAttribute == null || String.IsNullOrWhiteSpace(idRefAttribute.Value))
throw new Exception("Incorrect EPUB spine: item ID ref is missing");
spineItemRef.IdRef = idRefAttribute.Value;
XmlAttribute linearAttribute = spineItemNode.Attributes["linear"];
spineItemRef.IsLinear = linearAttribute == null || String.Compare(linearAttribute.Value, "no", StringComparison.OrdinalIgnoreCase) != 0;
result.Add(spineItemRef);
}
return result;
}
