private Expression NodeNameEquals(string localName, string namespaceUri)
{
if (string.IsNullOrEmpty(namespaceUri))
{
return(StringExpression.Equals(Reader.LocalName, localName, StringComparison.OrdinalIgnoreCase));
}
return(Expression.AndAlso(
StringExpression.Equals(Reader.LocalName, localName, StringComparison.OrdinalIgnoreCase),
Expression.OrElse(
StringExpression.Equals(Reader.NamespaceURI, StringExpression.Empty(), StringComparison.OrdinalIgnoreCase),
StringExpression.Equals(Reader.NamespaceURI, namespaceUri, StringComparison.OrdinalIgnoreCase))));
}
public override Expression Scalar(Expression valueType, BondDataType expectedType, ValueHandler handler)
{
var stringValue = Expression.Variable(typeof(string), "valueAsString");
// Reading primitive field of a struct, or a primitive list item - value is in Xml element text.
// If we have an empty element, parse it as if it has an empty text.
// Otherwise: read once to get to the text, handle the text, read once more to get to the end element.
return(Expression.Block(
new[] { stringValue },
Expression.IfThenElse(
Reader.IsEmptyElement,
Expression.Assign(stringValue, StringExpression.Empty()),
Expression.Block(
Reader.Read(),
Expression.IfThenElse(
Expression.Equal(Reader.NodeType, Expression.Constant(XmlNodeType.EndElement)),
Expression.Assign(stringValue, Expression.Constant(string.Empty)),
Expression.Block(
IfNotNodeType(XmlNodeType.Text, IfNotNodeType(XmlNodeType.Whitespace, ParsingError())),
Expression.Assign(stringValue, Reader.Value),
Reader.Read(),
IfNotNodeType(XmlNodeType.EndElement, ParsingError()))))),
handler(StringExpression.Convert(stringValue, expectedType))));
}
static Cache()
{
Expression create;
if (typeof(T) == typeof(string))
{
create = StringExpression.Empty();
}
else if (typeof(T).IsBonded())
{
create = Expression.Field(null,
typeof(Bonded <>).MakeGenericType(typeof(T).GetValueType()).GetTypeInfo().GetDeclaredField("Empty"));
}
else if (typeof(T).IsClass())
{
create = Expression.New(typeof(T));
}
else
{
create = Expression.Default(typeof(T));
}
Create = Expression.Lambda <Func <T> >(create).Compile();
}
