[pmwiki-users] In code, how to conditionally prevent Markup processing on subsequent run due to PRR

[Peter Bowers]

If you need other rules to continue to act on your markup (i.e.,
Keep() won't work) I *think* this will work...

===(snip)===
Markup('realaction', 'certainorder', '/mypattern/e', 'RealAction("$0")');
Markup('rulestopper', '>realaction', '/\(:rulestopper:\)/e', 'RuleStopper()');

function RealAction($str)
{
  global $MyActionStatus; // 0=first time called, 1=still active, 2=inactive
  SDV($MyActionStatus, 0);
  if ($MyActionStatus == 2) return ($str); // don't change anything
  // do other stuff setting $rtn
  if ($MyActionStatus == 0) {
    $MyActionStatus = 1;
    return $rtn.'(:rulestopper:)'; // make sure RuleStopper() will be called
  }
  return $rtn;
}

function RuleStopper()
{
  global $MyActionStatus;
  $MyActionStatus = 2;
  return ''; // get rid of the (:rulestopper:) markup
}
===(snip)===

Of course, depending on what your RealAction() is doing and returning
it may be appropriate to append some arbitrary markup, so that may not
be a good solution...

Also (caveat) this is email-created-software and so it may cause
global hunger, syntax errors, nuclear war, and other negative side
effects (including not working) when used in real life... :-)

It would be nice if PRR() had some global value that it incremented to
indicate how many times the rules have been restarted -- then a simple
static variable would solve it.  But it's not a common need, so I'm
not sure if it's worth a PITS entry or not...

Hope that helps.

-Peter

On Tue, Jan 11, 2011 at 6:22 PM, Chris Cox <ccox at endlessnow.com> wrote:
> How do I stop reprocessing due to PRR?  I have php code that does some
> Markup replacement and I want to make sure that it doesn't get run again
> if PRR is called by some other markup.
>
>
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