public static CompiledExpression Compile(Expression expression, NameResolver nameResolver)
{
var actual = expression;
actual = VariadicCallRewriter.Rewrite(actual);
actual = TextMatchingTransformer.Rewrite(actual);
actual = LikeSyntaxTransformer.Rewrite(actual);
actual = PropertiesObjectAccessorTransformer.Rewrite(actual);
actual = ConstantArrayEvaluator.Evaluate(actual);
actual = WildcardComprehensionTransformer.Expand(actual);
return(LinqExpressionCompiler.Compile(actual, nameResolver));
}
public static object ElementAt(object items, object index)
{
var arr = items as SequenceValue;
if (arr != null)
{
if (!(index is decimal))
{
return(Undefined.Value);
}
var dec = (decimal)index;
if (dec != Math.Floor(dec))
{
return(Undefined.Value);
}
var idx = (int)dec;
if (idx >= arr.Elements.Count())
{
return(Undefined.Value);
}
return(Representation.Represent(arr.Elements.ElementAt(idx)));
}
var dict = items as StructureValue;
if (dict != null)
{
var s = index as string;
if (s == null)
{
return(Undefined.Value);
}
LogEventPropertyValue value;
if (!LinqExpressionCompiler.TryGetStructurePropertyValue(dict, s, out value))
{
return(Undefined.Value);
}
return(Representation.Represent(value));
}
return(Undefined.Value);
}
public static Func <LogEvent, object> CompileAndExpose(FilterExpression expression)
{
var actual = expression;
actual = PropertiesObjectAccessorTransformer.Rewrite(actual);
actual = WildcardComprehensionTransformer.Expand(actual);
actual = LikeOperatorTransformer.Rewrite(actual);
actual = IsOperatorTransformer.Rewrite(actual);
actual = FilterExpressionCostReordering.Reorder(actual);
actual = TextMatchingTransformer.Rewrite(actual);
var compiled = LinqExpressionCompiler.Compile(actual);
return(ctx =>
{
var result = compiled(ctx);
return Representation.Expose(result);
});
}
