It turns out I have zero use cases for Succeed(). Not the one I thought of.
Peter-Arno Coppen set me right & suggested a use for Succeed().
I hope he won't mind me posting this here. I don't have his permission.
He may not welcome replies from the Unicon Group. (I remember there have
been flame wars, even here.)
-------- Forwarded Message --------
Subject: RE: [snobol] Succeed() useless? UTR18 Unicon, Snobol
Date: Mon, 15 Feb 2016 12:27:42 +0000
From: 'Coppen, P.A.J.M. (Peter-Arno)' p.a.cop...@let.ru.nl [snobol]
<sno...@yahoogroups.com>
Reply-To: sno...@yahoogroups.com
To: sno...@yahoogroups.com
The only use would be an oscillation between &SUCCEED PAT &FAIL, where
PAT contains an alternative with &ABORT. This way, you can build a kind
of control structure in a pattern (by calling functions upon partial
matches)
*From:*sno...@yahoogroups.com [mailto:sno...@yahoogroups.com]
*Sent:* maandag 15 februari 2016 13:20
*To:* sno...@yahoogroups.com
*Subject:* Re: [snobol] Succeed() useless? UTR18 Unicon, Snobol
P.A. Coppen:
...&succeed succeeds upon every backtrack. ... [null doesn't]
Jay:
You are quite correct & this is an important difference.
It means that I don't need Succeed() in my use case, as I can replace
it by a null match which is more restrictive and therefore different.
Are there any uses at all for Succeed() / &succeed ?
-------------------------
I was not thinking much about backtracking in relation to
gap-in-paradigm patterns. Generally you can match a null anywhere. That
makes a pattern to spot gap-in-paradigm potentially difficult. Not
backtracking (much) simplifies it. I'd expect in these patterns,
immediate assignment doesn't do anything different to conditional
assignment.
Maybe I should have added fence to be explicit about how little
backtracking I wanted or expected.
p1 = p1 | (Succeed . colOneData FENCE)
and
p4 = p4 | (Succeed . colFourData FENCE)
and /or replace Succeed by null.
Actually, I imagined, but did not program the pattern to be:
rowpattern = p1 FENCE p2FENCE p3 FENCE p4 FENCE p5
with P1 & P4 still having null (or Succeed Fence) as the last
alternative sub-pattern.
Jay Hammond
On 15/02/2016 09:48, 'Coppen, P.A.J.M. (Peter-Arno)'
p.a.cop...@let.ru.nl <mailto:p.a.cop...@let.ru.nl> [snobol] wrote:
The difference between &succeed and the null string seems to me that
&succeed succeeds upon every backtrack. So POS(0) &SUCCEED PAT &FAIL
keeps on trying PAT forever (unless PAT contains &ABORT), and POS(0)
NULL PAT &FAIL doesn’t.
Peter-Arno Coppen
*From:*sno...@yahoogroups.com <mailto:sno...@yahoogroups.com>
[mailto:sno...@yahoogroups.com]
*Sent:* maandag 15 februari 2016 1:14
*To:* unicon-group@lists.sourceforge.net
<mailto:unicon-group@lists.sourceforge.net>; sno...@yahoogroups.com
<mailto:sno...@yahoogroups.com>
*Subject:* [snobol] Succeed() useless? UTR18 Unicon, Snobol
Jay wrote (snipped)
I know a practical use for Succeed() or its equivalents.
Do you have any more?
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