private IDictionary <string, DocumentSortOrder> BuildOrder(IHttpRequest request)
{
var orderMethods = ParseOrder(request);
if (orderMethods != null)
{
var order = new Dictionary <string, DocumentSortOrder>();
foreach (var orderMethod in orderMethods)
{
var orderProperties = FuncOrderQuerySyntaxVisitor.CreateOrderExpression(orderMethod);
if (orderProperties != null)
{
foreach (var orderProperty in orderProperties)
{
order.Add(orderProperty.Key, orderProperty.Value);
}
}
}
return(order);
}
return(null);
}
public static IEnumerable <KeyValuePair <string, DocumentSortOrder> > CreateOrderExpression(InvocationQuerySyntaxNode node)
{
var visitor = new FuncOrderQuerySyntaxVisitor();
var orderProperties = visitor.Visit(node);
return(orderProperties);
}
private static IEnumerable <KeyValuePair <string, DocumentSortOrder> > TextScoreInvocation(FuncOrderQuerySyntaxVisitor visitor, InvocationQuerySyntaxNode node)
{
// textScore(property) --> p.IncludeTextScore(property)
var property = (node.Arguments.Count > 0) ? node.Arguments[0].AsIdentifierName() : QuerySyntaxHelper.TextScoreMethodName;
yield return(new KeyValuePair <string, DocumentSortOrder>(property, DocumentSortOrder.TextScore));
}
private static IEnumerable <KeyValuePair <string, DocumentSortOrder> > DescInvocation(FuncOrderQuerySyntaxVisitor visitor, InvocationQuerySyntaxNode node)
{
// desc(property1, property2, property3, ...) --> new[] { { property1, DocumentSortOrder.Desc }, { property2, DocumentSortOrder.Desc }, { property3, DocumentSortOrder.Desc }, ... }
return(node.Arguments.Select(i => new KeyValuePair <string, DocumentSortOrder>(i.AsIdentifierName(), DocumentSortOrder.Desc)));
}