public static List <EvalEvidence> GetEvidence <T>(this IConditionExpression condition, T instance)
{
var leafEvaluators = new List <LeafExpression>();
PopulateLeafFieldEvaluators(condition, leafEvaluators);
var list = new List <EvalEvidence>();
foreach (var leafExpr in leafEvaluators)
{
var ctxParameter = Expression.Parameter(typeof(T), "ctx");
var leftExpression =
ctxParameter.EvaluateExpression(leafExpr.Left, leafExpr.Operator != Operator.IsNull && leafExpr.Operator != Operator.NotIsNull);
var leftType = leftExpression.Type;
var lambda = Expression.Lambda(leftExpression, ctxParameter);
var getValue = lambda.Compile();
var actualObj = getValue.DynamicInvoke(instance);
object expected = leafExpr.Right;
Type rightType = typeof(string);
if (leafExpr.RightSideIsExpression)
{
var rightExpression = ctxParameter.EvaluateExpression(leafExpr.Right);
lambda = Expression.Lambda(rightExpression, ctxParameter);
getValue = lambda.Compile();
var expectedObj = getValue.DynamicInvoke(instance);
expected = expectedObj;
rightType = rightExpression.Type;
}
var evidence = new EvalEvidence()
{
Expression = leafExpr,
LeftType = leftType,
RightType = rightType,
Actual = actualObj == null ? null : JToken.FromObject(actualObj),
Expected = JToken.FromObject(expected)
};
var getScore = evidence.GetScore <T>();
evidence.Score = getScore(instance);
list.Add(evidence);
}
return(list);
}
