/// <summary>
/// Evaluate the subexpression with the specified
/// parameters.
/// </summary>
/// <param name="expressionParameterNumber">Parameter number
/// corresponding to the subexpression which is to be
/// evaluated.</param>
/// <param name="parameters">Replacement parameters
/// to use for evaluation.</param>
/// <returns>The object result of the evaluation</returns>
public object EvaluateSubExpression(int expressionParameterNumber, EvaluatorParameters parameters)
{
MethodInfo methodInfo = this.GetType().GetMethod(string.Format("Eval{0}", expressionParameterNumber), BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.NonPublic);
if (methodInfo == null)
{
throw new ArgumentException("Could not find a matching evaluation method for that number.", "expressionParameterNumber");
}
return(methodInfo.Invoke(this, new object[] { parameters.Parameters }));
}
/// <summary> /// Evaluate the expression with the specified /// parameters. /// </summary> /// <param name="parameters">Replacement parameters /// to use for the evaluation.</param> /// <returns>The object result of the evaluation</returns> public abstract object Evaluate(EvaluatorParameters parameters);
/// <summary>
/// Evaluate the subexpression with the specified
/// parameters.
/// </summary>
/// <param name="expressionParameterNumber">Parameter number
/// corresponding to the subexpression which is to be
/// evaluated.</param>
/// <param name="parameters">Replacement parameters
/// to use for evaluation.</param>
/// <returns>The object result of the evaluation</returns>
public object EvaluateSubExpression(int expressionParameterNumber, EvaluatorParameters parameters)
{
MethodInfo methodInfo = this.GetType().GetMethod(string.Format("Eval{0}", expressionParameterNumber), BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.NonPublic);
if (methodInfo == null)
{
throw new ArgumentException("Could not find a matching evaluation method for that number.", "expressionParameterNumber");
}
return methodInfo.Invoke(this, new object[] { parameters.Parameters });
}
/// <summary> /// Evaluate the expression with the specified /// parameters. /// </summary> /// <param name="parameters">Replacement parameters /// to use for the evaluation.</param> /// <returns>The object result of the evaluation</returns> public abstract object Evaluate(EvaluatorParameters parameters);
private void SetParameters(CodeExpression root, EvaluatorParameters parameters)
{
if (root is CodeBinaryOperatorExpression)
{
CodeBinaryOperatorExpression bin = (CodeBinaryOperatorExpression)root;
this.SetParameters(bin.Left, parameters);
this.SetParameters(bin.Right, parameters);
}
else
{
if (root is CodePrimitiveExpression)
{
CodePrimitiveExpression primitive = (CodePrimitiveExpression)root;
int parameterNumber = EvaluatorGenerator.GetParameterIndex(primitive, false);
if (parameterNumber >= 0)
{
parameters.SetParameter(parameterNumber, primitive.Value);
}
}
else
{
throw new ApplicationException("Cannot evaluate a rule until all variables have been set.");
}
}
}
