public object Evaluate(ExecutionState state, Token contextToken)
{
if (expr is IPropertyEvaluatorExpression)
{
if (!((IPropertyEvaluatorExpression)expr).IsValidPropertyName(token.Value))
{
throw new InstructionExecutionException("\"" + token.Value + "\" is not a valid property for this object. (Underlying type: " + expr.GetType().Name + ")", token);
}
object x = ((IPropertyEvaluatorExpression)expr).EvaluateProperty(token.Value, token, state);
if (x != null)
{
if (x.ToString() == VariableExpression.InvalidProperty)
{
throw new InstructionExecutionException("\"" + token.Value + "\" is not a valid property for this object. (Underlying type: " + expr.GetType().Name + ")", token);
}
}
return(x);
}
object o = expr.Evaluate(state, token);
if (o is IPropertyEvaluatorExpression)
{
return(((IPropertyEvaluatorExpression)o).EvaluateProperty(token.Value, token, state));
}
return(SystemTypeEvaluator.EvaluateProperty(o, token.Value, token));
}
public object EvaluateProperty(string propertyName, Token token, ExecutionState state)
{
object o = state.HasVariable(variableToken.Value) ? state.GetVariable(variableToken.Value) : null;
if (o is IPropertyEvaluatorExpression)
{
object val = ((IPropertyEvaluatorExpression)o).EvaluateProperty(propertyName, token, state);
if (val != null)
{
if (val.ToString() == VariableExpression.InvalidProperty)
{
throw new InstructionExecutionException("\"" + propertyName + "\" is not a valid property of this variable.", token);
}
}
return(val);
}
else
{
return(SystemTypeEvaluator.EvaluateProperty(o, propertyName, token));
}
}