/// <summary>Quads where Object is one of the literal values</summary>
public static IEnumerable <Quad> IsValue(
this IEnumerable <Quad> self,
IBasicNodeFactory f,
params string[] literals)
{
var nodes = literals.Select(x => f.New(x));
return(self.Where(x => nodes.Contains(x.Object)));
}
/// <summary>
/// Create Literal or Text or Typed-literal.
/// </summary>
public static Node NewNode(this IBasicNodeFactory self,
ReadOnlySpan <char> valueString,
ReadOnlySpan <char> dataType,
ReadOnlySpan <char> language)
{
if (!dataType.IsEmpty && !language.IsEmpty)
{
throw new Exception("Cannot have both data type and language");
}
if (!language.IsEmpty)
{
return(self.New(new Text(
new string(valueString),
new string(language))));
}
if (!dataType.IsEmpty)
{
return(self.New(valueString, dataType));
}
return(self.New(valueString, XMLSchema.String));
}
/// <summary>
/// Creates either a text node or literal node.
/// </summary>
public static Node TextOrLiteral(this IBasicNodeFactory self,
ReadOnlySpan <char> value, ReadOnlySpan <char> language)
=> language.IsEmpty ? (Node)self.New(new string(value))
: self.Text(value, language);
/// <summary>
/// Create a text node: a string literal with language.
/// </summary>
public static Node <Text> Text(this IBasicNodeFactory self,
ReadOnlySpan <char> text, ReadOnlySpan <char> language)
=> self.New(new Text(new string(text), new string(language)));
public static Node <string> Literal(this IBasicNodeFactory self, ReadOnlySpan <char> value) => (Node <string>)self.New(value, XMLSchema.String);