public static T GetAttribute <T>(this HtmlNode node, string attributeName, T def = default)
{
var r = node.GetAttribute(attributeName, default(string));
if (r == null)
{
return(def);
}
return((T)Convert.ChangeType(r, typeof(T)));
}
public static bool GetAttribute(this HtmlNode node, string attributeName, bool def = default)
{
var r = node.GetAttribute(attributeName, default(string));
if (r == null)
{
return(def);
}
return(true);
}
public static Uri GetAttribute(this HtmlNode node, string attributeName, Uri baseUri, Uri def = default)
{
var r = node.GetAttribute(attributeName, default(string));
if (r == null)
{
return(def);
}
return(new Uri(baseUri, r));
}
public static int GetAttribute(this HtmlNode node, string attributeName, int def = default)
{
var r = node.GetAttribute(attributeName, default(string));
if (r == null)
{
return(def);
}
if (int.TryParse(r, out var intP))
{
return(intP);
}
return(def);
}
public IDictionary<string, string> UpdatePrefixMappings(ParserContext context, HtmlNode elementNode)
{
if (elementNode.HasAttribute(Constants.Prefix_RDFaAttribute))
{
var mappings = new Dictionary<string, string>(context.PrefixMappings);
string[] splits = Regex.Split(elementNode.GetAttribute(Constants.Prefix_RDFaAttribute).Value, "\\s+");
int i = 0;
while (i < splits.Length)
{
var prefix = splits[i].Split(':')[0];
var url = splits[i + 1];
if (prefix == "_")
{
continue;
}
if (!string.IsNullOrEmpty(prefix) && !mappings.ContainsKey(prefix))
{
mappings.Add(prefix, url);
}
i += 2;
}
if (mappings.Count > context.PrefixMappings.Count)
context.PrefixMappings = mappings;
}
return context.PrefixMappings;
}