object IVisitor <object> .visit(ForLoopNode node)
{
Node ForControlNode = node.getLeft();
// Control variable initial assignment
int control = Convert.ToInt32(ForControlNode.getLeft().accept(new Evaluator()));
int times = Convert.ToInt32(ForControlNode.getRight().getRight().accept(new Evaluator()));
for (int i = control; i <= times; i++)
{
SymbolTable.assign(ForControlNode.getLeft().getLeft().value, i.ToString());
node.getRight().accept(this);
}
return(null);
}
object IVisitor <object> .visit(ReadNode node)
{
Node child = node.getLeft();
Console.Write(">>> ");
string value = Console.ReadLine();
if (child.type == Token.INT)
{
try {
int value_i = int.Parse(value);
SymbolTable.assign(child.value, value_i.ToString());
}
catch {
new RuntimeError(child, "Runtime Error: Could not parse interger from the input.");
}
}
else
{
SymbolTable.assign(child.value, value);
}
return(null);
}
object IVisitor <object> .visit(AssignmentNode node)
{
SymbolTable.assign(node.getLeft().value, node.getRight().accept(new Evaluator()).ToString());
return(null);
}