protected override FilterExpression Transform(FilterCallExpression lx)
{
if (!Operators.WildcardComparators.Contains(lx.OperatorName) || lx.Operands.Length != 2)
{
return(base.Transform(lx));
}
var lhsIs = FilterExpressionWildcardSearch.FindElementAtWildcard(lx.Operands[0]);
var rhsIs = FilterExpressionWildcardSearch.FindElementAtWildcard(lx.Operands[1]);
if (lhsIs != null && rhsIs != null || lhsIs == null && rhsIs == null)
{
return(base.Transform(lx)); // N/A, or invalid
}
var wcpath = lhsIs != null ? lx.Operands[0] : lx.Operands[1];
var comparand = lhsIs != null ? lx.Operands[1] : lx.Operands[0];
var elmat = lhsIs ?? rhsIs;
var parm = new FilterParameterExpression("p" + _nextParameter++);
var nestedComparand = FilterExpressionNodeReplacer.Replace(wcpath, elmat, parm);
var coll = elmat.Operands[0];
var wc = ((FilterWildcardExpression)elmat.Operands[1]).Wildcard;
var comparisonArgs = lhsIs != null ? new[] { nestedComparand, comparand } : new[] { comparand, nestedComparand };
var body = new FilterCallExpression(lx.OperatorName, comparisonArgs);
var lambda = new FilterLambdaExpression(new[] { parm }, body);
var op = Operators.ToRuntimeWildcardOperator(wc);
var call = new FilterCallExpression(op, new[] { coll, lambda });
return(Transform(call));
}
protected override Expression <CompiledFilterExpression> Transform(FilterParameterExpression prx)
{
// Will be within a lambda, which will subsequently sub-in the actual value
var context = Expression.Parameter(typeof(LogEvent));
var constant = Expression.Constant(prx, typeof(object));
return(Expression.Lambda <CompiledFilterExpression>(constant, new[] { context }));
}
protected override FilterExpression Transform(FilterParameterExpression prx)
{
if (prx == _source)
{
return(_dest);
}
return(base.Transform(prx));
}
// Only touches uses of the parameters, not decls
protected override FilterExpression Transform(FilterParameterExpression prx)
{
return(prx);
}
protected override FilterExpressionCosting Transform(FilterParameterExpression prx)
{
return(new FilterExpressionCosting(prx, 0.1));
}
protected abstract TResult Transform(FilterParameterExpression prx);
