public static bool IsValid <T>(this IGridifyFiltering filtering, IGridifyMapper <T>?mapper = null)
{
if (string.IsNullOrWhiteSpace(filtering.Filter))
{
return(true);
}
try
{
var parser = new Parser(filtering.Filter !, GridifyGlobalConfiguration.CustomOperators.Operators);
var syntaxTree = parser.Parse();
if (syntaxTree.Diagnostics.Any())
{
return(false);
}
var fieldExpressions = syntaxTree.Root.Descendants()
.Where(q => q.Kind is SyntaxKind.FieldExpression)
.Cast <FieldExpressionSyntax>().ToList();
mapper ??= new GridifyMapper <T>(true);
if (fieldExpressions.Any(field => !mapper.HasMap(field.FieldToken.Text)))
{
return(false);
}
}
catch (Exception)
{
return(false);
}
return(true);
}
public static Expression <Func <T, bool> > GetFilteringExpression <T>(this IGridifyFiltering gridifyFiltering, IGridifyMapper <T>?mapper = null)
{
if (string.IsNullOrWhiteSpace(gridifyFiltering.Filter))
{
throw new GridifyQueryException("Filter is not defined");
}
var syntaxTree = SyntaxTree.Parse(gridifyFiltering.Filter !, GridifyGlobalConfiguration.CustomOperators.Operators);
if (syntaxTree.Diagnostics.Any())
{
throw new GridifyFilteringException(syntaxTree.Diagnostics.Last() !);
}
mapper = mapper.FixMapper(syntaxTree);
var(queryExpression, _) = ExpressionToQueryConvertor.GenerateQuery(syntaxTree.Root, mapper);
if (queryExpression == null)
{
throw new GridifyQueryException("Can not create expression with current data");
}
return(queryExpression);
}
