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Re: Re: I refuse to explain this

by strredwolf (Chaplain)
on Apr 09, 2001 at 08:13 UTC ( #70921=note: print w/ replies, xml ) Need Help??


in reply to Re: I refuse to explain this
in thread I refuse to explain this

I did. But I'll agree that it's helps shorten it (sub in regexp?).

But expanding $_ out does make it look like you're doing a virtual machine inside of the s///ex regexp. Source code (or is it VM machine code?) and a state engine, like my own obfusc.

--
$Stalag99{"URL"}="http://stalag99.keenspace.com";


Comment on Re: Re: I refuse to explain this
Re: I refuse to explain this
by Dominus (Parson) on Apr 09, 2001 at 20:18 UTC
    Says strredwolf:
    But expanding $_ out does make it look like ... a state engine,
    (Shrug.) All I can do is to repeat that it isn't a state engine. In fact, I'm at something of a loss to imagine where you think the state variable is.

      $d and $q. The loop, of course, is conditional on $N.

      --
      $Stalag99{"URL"}="http://stalag99.keenspace.com";

        Says strredwolf:
        $d and $q.
        OK, that just makes no sense at all. A state variable has to record state. The only thing $q is used for is to match the subtitution on the right side of the s{}{} with the pattern on the left. It's just a table lookup. In fact, an earlier version of the program omitted $q and just had:

        redo if s/`I($z)/$1/; redo if s/``K($z)($z)/$1/; redo if s/```S($z)($z)($z)/``$1$3`$2$3/; ...
        I think the program probably would work fine with that change, although it would be less interesting. (It would sometimes go into an infinite loop for most interesting values of $_.)

        As for $d, it's only used internal to the regex itself, so it's obviously impossible that it could be a state variable.

        The loop, of course, is conditional on $N.
        Of course, but $N never takes on any value except 0 or 1. State machines are normally understood to have more than two states.

        If what you're saying is that this is a state machine because it uses variables, then Oracle 8 is also a mere state machine.

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