internal Evaluator(
string expression, Delegate method, int argsCount)
{
Debug.Assert(expression != null);
Debug.Assert(argsCount >= 0);
Debug.Assert(method != null);
this.expression = expression;
this.argsCount = argsCount;
this.Evaluate0 = Throw0;
this.Evaluate1 = Throw1;
this.Evaluate2 = Throw2;
if (argsCount == 0)
{
this.Evaluate0 = (EvalFunc0 <T>)method;
this.EvaluateN = (a => this.Evaluate0());
}
else if (argsCount == 1)
{
this.Evaluate1 = (EvalFunc1 <T>)method;
this.EvaluateN = (a => this.Evaluate1(a[0]));
}
else if (argsCount == 2)
{
this.Evaluate2 = (EvalFunc2 <T>)method;
this.EvaluateN = (a => this.Evaluate2(a[0], a[1]));
}
else
{
this.EvaluateN = (EvalFuncN <T>)method;
}
}
/// <summary>
/// Adds the <see cref="EvalFuncN{T}"/> delegate
/// to the <see cref="FunctionCollection{T}"/> with the
/// function name, taken from real method name.</summary>
/// <param name="target">
/// <see cref="EvalFuncN{T}"/> instance to add.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="target"/> is null.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="target"/> is not valid delegate
/// to be added to the <see cref="FunctionCollection{T}"/>.
/// <br/>-or-<br/><see cref="FunctionInfo{T}"/> with the
/// same name and same arguments count already exist
/// in the collection (overload impossible).</exception>
/// <remarks>Not available on .NET CF 2.0 because
/// it's impossible to resolve method name.</remarks>
public void Add(EvalFuncN <T> target)
{
AddFunc(FunctionFactory <T>
.FromDelegate(target, true));
}
/// <summary>
/// Adds the <see cref="EvalFuncN{T}"/> delegate
/// to the <see cref="FunctionCollection{T}"/>
/// with the specified function name.</summary>
/// <param name="name">Function group name.</param>
/// <param name="target">
/// <see cref="EvalFuncN{T}"/> instance to add.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="target"/> is null.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="target"/> is not valid delegate
/// to be added to the <see cref="FunctionCollection{T}"/>.
/// <br/>-or-<br/><see cref="FunctionInfo{T}"/> with the
/// same name and same arguments count already exist
/// in the collection (overload impossible).</exception>
public void Add(string name, EvalFuncN <T> target)
{
AddFunc(name, FunctionFactory <T>
.FromDelegate(target, true));
}
