public void AddFilterSymbolToCurrentExpression(FilterSymbol filter)
{
_liquidExpressionStack.Peek().Data.AddFilterSymbol(filter);
}
public void AddFilterSymbolToLastExpression(FilterSymbol filter)
{
_lastExpression.Data.AddFilterSymbol(filter);
}
private static IFilterExpression InstantiateFilter(ITemplateContext templateContext, FilterSymbol filterSymbol)
{
var filterType = templateContext.SymbolTableStack.LookupFilterType(filterSymbol.Name);
if (filterType == null)
{
//TODO: make this return an error filter or something?
//throw new Exception("Invalid filter: " + filterSymbol.Name);
//return new Tuple<String, IFilterExpression>(filterSymbol.Name, null);
return null;
}
var expressionConstants = filterSymbol.Args.Select(x => LiquidExpressionEvaluator.Eval(x, templateContext)).ToList();
//var expressionConstants = filterSymbol.Args.Select(x => x.Eval(templateContext, new List<Option<IExpressionConstant>>())).ToList();
// TODO: Handle the error if any
//return FilterFactory.InstantiateFilter(filterSymbol.Name, filterType, expressionConstants.Select(x => x.IsSuccess? x.SuccessResult));
if (expressionConstants.Any(x => x.IsError))
{
//return null; // eval-ing a constant failed.
throw 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 AddFilterSymbol(FilterSymbol filterSymbol)
{
_filterSymbols.Add(filterSymbol);
}
public void AddFilterSymbol(FilterSymbol filterSymbol)
{
_filterSymbols.Add(filterSymbol);
}
