public override bool TryHandleEnter(
QueryableSortContext context,
ISortField field,
ObjectFieldNode node,
[NotNullWhen(true)] out ISyntaxVisitorAction?action)
{
if (node.Value.IsNull())
{
context.ReportError(
ErrorHelper.CreateNonNullError(field, node.Value, context));
action = SyntaxVisitor.Skip;
return(true);
}
if (field.RuntimeType is null)
{
action = null;
return(false);
}
if (!(context.GetInstance() is QueryableFieldSelector lastFieldSelector))
{
throw ThrowHelper.Sorting_InvalidState_ParentIsNoFieldSelector(field);
}
Expression lastSelector = lastFieldSelector.Selector;
Expression nextSelector = field.Member switch
{
PropertyInfo i => Expression.Property(lastSelector, i),
MethodInfo i => Expression.Call(lastSelector, i),
{ } i => throw ThrowHelper.QueryableSorting_MemberInvalid(i, field),
null => throw ThrowHelper.QueryableSorting_NoMemberDeclared(field),
};
if (context.InMemory)
{
nextSelector = SortExpressionBuilder.IfNullThenDefault(
lastSelector,
nextSelector,
Expression.Default(field.RuntimeType.Source));
}
context.PushInstance(lastFieldSelector.WithSelector(nextSelector));
context.RuntimeTypes.Push(field.RuntimeType);
action = SyntaxVisitor.Continue;
return(true);
}
