public void Execute(SourceStack stack, TStoreProcessor processor, string token)
{
RecordSource right = stack.Pop();
RecordSource left = stack.Pop();
RecordSource source = processor.Pair(left, right, PairOperation.FilterLeftNotInRight);
stack.Push(source);
}
public void Execute(SourceStack stack, TStoreProcessor processor, string token)
{
Match m = regex.Match(token);
if (!m.Success) {
Console.WriteLine("syntax error in Merge()");
Environment.Exit(0);
}
string direction = m.Groups["d"].ToString().Trim();
bool ascending = true;
if (direction.Equals("-")) {
ascending = false;
}
int nary = int.Parse(m.Groups["n"].ToString());
// set the direction of the empty source so that a sorter doesn't get inserted
// to sort nothing.
RecordSource source = processor.EmptySource(true, ascending);
for (int i = 0; i < nary; i++) {
RecordSource next = stack.Pop();
if (ascending) source = processor.Pair(next, source, PairOperation.MergeAscend);
else source = processor.Pair(next, source, PairOperation.MergeDescend);
}
stack.Push(source);
}
public void Execute(SourceStack stack, TStoreProcessor processor, string token)
{
Match m = regex.Match(token);
if (!m.Success) {
Console.WriteLine("syntax error in Concat()");
Environment.Exit(0);
}
int arity = int.Parse(m.Groups["a"].ToString());
if (arity > stack.Size) {
Console.WriteLine("Concat arity greater than stack size.");
Environment.Exit(0);
}
RecordSource right = stack.Pop();
for (int i = 1; i < arity; i++) {
RecordSource left = stack.Pop();
right = processor.Pair(left, right, PairOperation.CatLeftThenRight);
}
stack.Push(right);
}