private static Try <IFilterExpression> InstantiateFilter(ITemplateContext templateContext, FilterSymbol filterSymbol)
{
var filterType = templateContext.SymbolTableStack.LookupFilterType(filterSymbol.Name);
// if (filterType == null)
// {
// return null;
// }
var expressionConstants = filterSymbol.Args.Select(x => Eval(x, templateContext)).ToList();
if (expressionConstants.Any(x => x.IsError))
{
//return null; // eval-ing a constant failed. TODO: Is this actually possible?
//throw new Exception(String.Join("," ,expressionConstants.Where(x => x.IsError).Select(x => x.ErrorResult.Message)));
return
(new Failure <IFilterExpression>(
new Exception(String.Join(",",
expressionConstants.Where(x => x.IsError).Select(x => x.ErrorResult.Message)))));
}
return(FilterFactory.InstantiateFilter(filterSymbol.Name, filterType, expressionConstants.Select(x => x.SuccessResult)));
}
public void AddFilterSymbolToLastExpression(FilterSymbol filter)
{
_lastExpression.Data.AddFilterSymbol(filter);
}
