private static string MemberExpressionToString(MemberExpression memberExpression)
{
if (memberExpression.Type == typeof(DateTime))
{
if (memberExpression.Member.Name == "UtcNow")
{
return(BuiltIn.Function.UtcNow);
}
// TODO: throw exception for any other DateTime type as not supported
}
if (memberExpression.Type.GetInterfaces().Any(x => x == typeof(IEnumerable <string>)))
{
object result = Expression.Lambda(memberExpression).Compile().DynamicInvoke();
return(ExpressionToString(Expression.Constant(result)));
}
if (memberExpression.Expression.NodeType == ExpressionType.Parameter)
{
var eventFieldMemberExpression = new EventFieldMemberExpression(memberExpression);
return(eventFieldMemberExpression.EscapedEventFieldName);
}
if (memberExpression.Expression.NodeType == ExpressionType.Constant)
{
object result = Expression.Lambda(memberExpression).Compile().DynamicInvoke();
return(ConvertObjectToString(result));
}
throw new NotImplementedException();
}
internal static Property Create <TY>(Expression <Func <TY, T> > property)
{
var eventFieldMemberExpression = new EventFieldMemberExpression(property.Body as MemberExpression);
if (BuiltIn.All().Contains(eventFieldMemberExpression.UnescapedEventFieldName))
{
return(Property.BuiltIn(eventFieldMemberExpression.UnescapedEventFieldName));
}
return(Property.Custom(eventFieldMemberExpression.UnescapedEventFieldName, eventFieldMemberExpression.EventFieldDataType));
}