private BaseFilterOperation <T> GenerateFilterOperation <T>(FilterNode node, QueryEngine <T> engine, ICollection <QueryError> errors)
{
var operatorIndex = node.token.position + node.filter.token.Length + (string.IsNullOrEmpty(node.paramValue) ? 0 : node.paramValue.Length);
var filterValueIndex = operatorIndex + node.op.token.Length;
Type filterValueType;
IParseResult parseResult = null;
if (QueryEngineUtils.IsNestedQueryToken(node.filterValue))
{
if (node.filter?.queryHandlerTransformer == null)
{
errors.Add(new QueryError(filterValueIndex, node.filterValue.Length, $"No nested query handler transformer set on filter \"{node.filter.token}\"."));
return(null);
}
filterValueType = node.filter.queryHandlerTransformer.rightHandSideType;
}
else
{
parseResult = engine.ParseFilterValue(node.filterValue, node.filter, node.op, out filterValueType);
if (!parseResult.success)
{
errors.Add(new QueryError(filterValueIndex, node.filterValue.Length, $"The value \"{node.filterValue}\" could not be converted to any of the supported handler types."));
return(null);
}
}
IFilterOperationGenerator generator = engine.GetGeneratorForType(filterValueType);
if (generator == null)
{
errors.Add(new QueryError(filterValueIndex, node.filterValue.Length, $"Unknown type \"{filterValueType}\". Did you set an operator handler for this type?"));
return(null);
}
var generatorData = new FilterOperationGeneratorData
{
filterValue = node.filterValue,
filterValueParseResult = parseResult,
globalStringComparison = engine.globalStringComparison,
op = node.op,
paramValue = node.paramValue,
generator = generator
};
var operation = node.filter.GenerateOperation(generatorData, operatorIndex, errors);
return(operation as BaseFilterOperation <T>);
}
static int MatchEmpty(string text, int startIndex, int endIndex, ICollection <QueryError> errors, out StringView sv, out Match match, out bool matched)
{
var currentIndex = startIndex;
var lengthMatched = 0;
matched = false;
while (currentIndex < endIndex && QueryEngineUtils.IsWhiteSpaceChar(text[currentIndex]))
{
++currentIndex;
++lengthMatched;
matched = true;
}
sv = text.GetStringView(startIndex, startIndex + lengthMatched);
match = null;
return(lengthMatched);
}