OpenEuphoria

Re: voting on GOTO - discussion.

• Posted by Lucius L. Hilley III <euphoria at un?mar?com> Jun 04, 2008
• 631 views

Derek Parnell wrote:
> 
> Larry Miller wrote:
> > 
> > As long term users of this forum will be well aware, Robert Craig was
> > opposed
> > to the introduction of goto into Euphoria. If this should ever happen I can
> > imagine what his initial reaction might be:
> > 
> > "WHAT HAVE THEY DONE TO MY BABY?"
> 
> Almost ... here is his response ...
> 
> ----------------------
> I vote No.
>  
> I don't want to now have to spend a couple of seconds
> scanning the source code for each routine (and top-level),
> checking for possible GOTO's or labels, every time I pick up
> someone else's Euphoria code. I like being absolutely safe
> in the knowledge that there can't be any.
>  
> e.g. to understand the control flow of any large block of code
> containing:
>  
>      .... dozens of lines of code, running more than one screen
>      .... but are there any GOTO's or labels in here?
>      .... I guess I now have to scan it all to be certain I understand
>      .... the flow of control
>  
> e.g.
>       while x do
>            Hmmm. I *used to* understand the possible
>            ways that control flow
>            could exit out of a while loop, but ...
>            (... any GOTO's or labels in here?)
>           < big chunk of messy code >
>       end while
>  
>       for i ... do
>           <big chunk of code>
>           any GOTO's ?
>           any labels?
>           can I even be sure the loop var has been initialized? No.
>       end for
>  
>       if x then -- used to look straightforward, but now ...?
>           <big chunk of code>
>           any GOTO's?
>           any labels?
>       else
>           <big chunk of code>
>           any GOTO's?
>           any labels?
>       end if
>  
<snip>

> Regards,
>     Rob Craig
>     Rapid Deployment Software
>     <a href="http://www.RapidEuphoria.com">http://www.RapidEuphoria.com</a>
> -------------------

My response to this is definately not a vote.
I can clearly see both sides. I easily understand both views.
I have not voted as of yet and will reserve my decision for a little longer.

function example1(atom a)
  ... Lots of code
  if (a = 3.14159) then
    return "Early exit"
  end if
  ... Lots of code

  return "Normal exit"
end function

procedure example2(atom a)
  ... Lots of code
  if (a = 3.14159) then
    return --"Early exit"
  end if
  ... Lots of code

  return "Normal exit"
end procedure

--example3
for index = 1 to 300 do
  ... Lots of code
  if (trigger) then
    exit  -- Early exit of the loop
  end if
  ... Lots of code
end for

--example4
while (trigger = 0) do
  ... Lots of code
  if (trigger) then
    exit  -- Early exit of the loop
  end if
  ... Lots of code
end while

    Lucius L. Hilley III - Unkmar