public static AstFilter Not(AstFilter filter)
{
if (filter is AstFieldOperationFilter fieldOperationFilter)
{
if (fieldOperationFilter.Operation is AstNotFilterOperation notFilterOperation)
{
return(new AstFieldOperationFilter(fieldOperationFilter.Field, notFilterOperation.Operation));
}
if (fieldOperationFilter.Operation is AstComparisonFilterOperation comparisonFilterOperation)
{
var comparisonOperator = comparisonFilterOperation.Operator;
if (comparisonOperator == AstComparisonFilterOperator.Eq || comparisonOperator == AstComparisonFilterOperator.Ne)
{
var oppositeComparisonOperator = comparisonOperator == AstComparisonFilterOperator.Eq ? AstComparisonFilterOperator.Ne : AstComparisonFilterOperator.Eq;
return(new AstFieldOperationFilter(fieldOperationFilter.Field, new AstComparisonFilterOperation(oppositeComparisonOperator, comparisonFilterOperation.Value)));
}
}
if (fieldOperationFilter.Operation is AstInFilterOperation inFilterOperation)
{
return(new AstFieldOperationFilter(fieldOperationFilter.Field, new AstNinFilterOperation(inFilterOperation.Values)));
}
if (fieldOperationFilter.Operation is AstNinFilterOperation ninFilterOperation)
{
return(new AstFieldOperationFilter(fieldOperationFilter.Field, new AstInFilterOperation(ninFilterOperation.Values)));
}
return(new AstFieldOperationFilter(fieldOperationFilter.Field, new AstNotFilterOperation(fieldOperationFilter.Operation)));
}
if (filter is AstNorFilter norFilter && norFilter.Filters.Count == 1)
{
return(norFilter.Filters[0]);
}
if (filter.NodeType == AstNodeType.MatchesEverythingFilter)
{
return(AstFilter.MatchesNothing());
}
if (filter.NodeType == AstNodeType.MatchesNothingFilter)
{
return(AstFilter.MatchesEverything());
}
return(new AstNorFilter(new[] { filter }));
}
