public override IPolicyExpression Parse(Stream stream)
{
IList <TokenTypeAssociation> tokens = ParseToTokens(stream);
ResetLevel();
IPolicyExpression retExpression = BuildExpression(tokens.GetEnumerator());
if (GetLevel() != 0)
{
throw new PolicyGrammarException("Group not closed.");
}
if (retExpression.GetExpressionType() != PolicyExpressionType.OPERATION)
{
throw new PolicyGrammarException("Expression must evaluate to an operation");
}
return(retExpression);
}
protected StackMachineEntry <OperationPolicyExpression> Compile(IList <IOpCode> entries, X509Certificate2 cert, IPolicyExpression expression)
{
switch (expression.GetExpressionType())
{
//case PolicyExpressionType.LITERAL:
// return new StackMachineEntry(((LiteralPolicyExpression < ? >)
// expression).
// GetPolicyValue())
// ;
//case PolicyExpressionType.REFERENCE:
//{
// object refExpression = GetRefExpressionType(expression);
// //IReferencePolicyExpression<X509Certificate2, object> refExpression = null;
// EvaluateReferenceExpression(cert, refExpression);
// return new ReferenceMachineEntry<IReferencePolicyExpression<X509Certificate2,T>>(expression);
//}
case PolicyExpressionType.OPERATION:
{
OperationPolicyExpression opExpression = (OperationPolicyExpression)expression;
foreach (IPolicyExpression policyExpression in opExpression.GetOperands())
{
if (policyExpression is IReferencePolicyExpression <X509Certificate2, String> )
{
var refExpression = policyExpression as IReferencePolicyExpression <X509Certificate2, String>;
EvaluateReferenceExpression(cert, refExpression);
entries.Add(Compile(refExpression));
}
else if (policyExpression is IReferencePolicyExpression <X509Certificate2, Int32> )
{
var refExpression = policyExpression as IReferencePolicyExpression <X509Certificate2, Int32>;
EvaluateReferenceExpression(cert, refExpression);
entries.Add(Compile(refExpression));
}
else if (policyExpression is IReferencePolicyExpression <X509Certificate2, Int64> )
{
var refExpression = policyExpression as IReferencePolicyExpression <X509Certificate2, Int64>;
EvaluateReferenceExpression(cert, refExpression);
entries.Add(Compile(refExpression));
}
else if (policyExpression is IReferencePolicyExpression <X509Certificate2, IList <String> > )
{
var refExpression = policyExpression as IReferencePolicyExpression <X509Certificate2, IList <String> >;
EvaluateReferenceExpression(cert, refExpression);
entries.Add(Compile(refExpression));
}
else if (policyExpression is IReferencePolicyExpression <X509Certificate2, Boolean> )
{
var refExpression = policyExpression as IReferencePolicyExpression <X509Certificate2, Boolean>;
EvaluateReferenceExpression(cert, refExpression);
entries.Add(Compile(refExpression));
}
else if (policyExpression is ILiteralPolicyExpression <String> )
{
entries.Add(Compile(policyExpression as ILiteralPolicyExpression <String>));
}
else
{
entries.Add(Compile(entries, cert, policyExpression));
}
}
return(new StackMachineEntry <OperationPolicyExpression>(opExpression.GetPolicyOperator()));
}
default:
return(null);
}
}