public ProgState OneStep(int index)
{
ProgState state;
try {
state = rep.getPrg(index);
}
catch (MyException.MyException e) {
throw e;
}
MyIntStack <IntStatement> stack = state.getExecStack();
if (stack.empty())
{
throw new MyException.MyException("Stack is empty!");
}
IntStatement statement = stack.pop();
ProgState newstate;
try {
newstate = statement.execute(state);
}
catch (MyException.MyException e) {
throw e;
}
return(newstate);
}
public ProgState execute(ProgState state)
{
MyIntStack <IntStatement> stack = state.getExecStack();
stack.push(second);
stack.push(first);
return(null);
}
public ProgState(
MyIntStack <IntStatement> stack,
MyIntDict <String, int> dict,
MyIntList <int> list,
IntFileTable _fileTable,
IntStatement statement)
{
execStack = stack;
symTable = dict;
output = list;
filetable = _fileTable;
originalProgram = statement;
execStack.push(statement);
}
public ProgState execute(ProgState state)
{
MyIntDict <String, int> tabel = state.getSymTable();
MyIntStack <IntStatement> stack = state.getExecStack();
int val;
try {
val = exp.eval(tabel);
}
catch (MyException.MyException e) {
throw e;
}
if (val != 0)
{
stack.push(first);
}
else
{
stack.push(second);
}
return(null);
}
