// Usage example of processors and traversers
static string printTree(Node tree, System.Type traverserType, int method)
{
AstPrinter proc = null;
switch (method)
{ // Possible methods to create a processor:
// use traverser object
case 1:
Traverser <bool> vtrav = (Traverser <bool>)Activator.CreateInstance(traverserType);
proc = new AstPrinter(vtrav);
vtrav.Processor = proc;
break;
// use 2 steps
case 2:
proc = new AstPrinter();
Activator.CreateInstance(traverserType, proc);
break;
// explicitly set traverser
case 3:
proc = new AstPrinter();
Traverser <bool> trav = (Traverser <bool>)Activator.CreateInstance(traverserType, proc);
trav.Processor = proc;
proc.traverse = trav.traverse;
break;
default:
return("");
}
proc.Visit(tree);
return(proc.ToString());
}