public ProgramState execute(ProgramState state)
{
int val = expr.evaluate(state.SymbolTable);
state.SymbolTable.setValue(id, val);
return(state);
}
public ProgramState execute(ProgramState state)
{
int val = expr.evaluate(state.SymbolTable);
state.Output.add(val);
return(state);
}
public int evaluate()
{
int l = left.evaluate();
if (op != null)
{
int r = right.evaluate();
return(op is Plus ? l + r : l - r);
}
return(l);
}
public ProgramState execute(ProgramState state)
{
int val = expr.evaluate(state.SymbolTable);
if (val != 0)
{
state.Stack.add(thenStmt);
}
else
{
state.Stack.add(elseStmt);
}
return(state);
}
public ProgramState execute(ProgramState state)
{
int val = id.evaluate(state.SymbolTable);
if (state.FileTab.exists(val))
{
StreamReader b = state.FileTab.getValue(val);
b.Close();
state.FileTab.delete(val);
}
else
{
throw new FileNotFoundException("File not found!");
}
return(state);
}
public int evaluate()
{
return(e.evaluate());
}
