/// <summary>
/// The method evaluates (executes) a program, which is represented as a syntax tree of nodes.
/// An input parameters could be integer arrays or integer values (represented as an array with single value).
/// </summary>
/// <param name="program">A program is represented as an AST</param>
/// <param name="inputStream">Program's input data</param>
/// <returns>An evaluated array of some data</returns>
public int[] Eval(IASTNode program, IInputStream inputStream)
{
if (program == null)
{
throw new ArgumentNullException("program", "The argument cannot equal to null");
}
if (inputStream == null)
{
throw new ArgumentNullException("inputData", "The argument cannot equal to null");
}
mInputStream = inputStream;
mEnvironment.Clear();
return((int[])program.Accept(this));
}
