[pmwiki-devel] Variable Expansion Question.

[Patrick R. Michaud]

On Tue, Oct 23, 2007 at 08:31:44AM -0400, Stirling Westrup wrote:
> I'm wondering if anyone has any insight on how Pm avoids recursive loops in
> his variable expansion routines. I ask because I need to do something similar
> and my reading of the PmWiki code has given me no insight.

PmWiki handles this within PageTextVar() -- when performing a
substitution for {$$foo}, it first removes any instances of
{$$foo} from the replacement string.  This prevents any form of
self-recursion from taking place.

PmWiki doesn't handle the case of indirect recursion of page text
variables... but that doesn't seem to occur very often in normal
practice.

Pm