private Expression GetFilterLambda(out EvoQLExpression parse, out ParameterExpression parameter)
{
var expression = GetFilterExpression(out parse, out parameter);
if (expression == null)
{
return(null);
}
var param = Expression.Parameter(typeof(Mention), "x");
Expression <Func <Mention, bool> > lambda = Expression.Lambda <Func <Mention, bool> >(ParameterRebinder.ReplaceParameters(expression, "x", param), param);
return(lambda);
}
private Expression GetFilterExpression(out EvoQLExpression parse, out ParameterExpression parameter)
{
parse = new EvoQLExpression(_query);
if (parse.HadErrors)
{
string errorString = "EvoQL Error:\n";
foreach (string error in parse.Errors)
{
errorString += error + "\n";
}
throw new EvoQLException(errorString);
}
parse.Tree.Init();
var root = parse.Tree;
if (root is GetExpression)
{
var get = (GetExpression)root;
var expression = get.CreateExpression(null);
parameter = Expression.Parameter(typeof(Mention), "x");
if (expression == null)
{
return(null);
}
return(ParameterRebinder.ReplaceParameters(expression, "x", parameter));
}
parameter = null;
return(null);
}