On Sat, 27 Jul 2013, Peter Bowers wrote:
On Fri, Jul 26, 2013 at 12:31 AM, Lars Eighner <[email protected]>wrote:
I want to set a PTV to the value of an expression which is evaluated once
when the PTV is set and is never evaluated again so that the PTV has the
value of the result string, not the expression string.
Unfortunately this is not possible with the current implementation of
PTVs.[1]
You are exactly correct that the PTV becomes the *expression* rather than
the *value* of the expression.
Good. I thought I was losing what little was left of my mind when I could
not get PTVs to behave according my intuitive concept of variables. In any
event, knowing I am on the wrong track is progress of a sort.
This is the thinking outloud part (not a request except for hints):
What I probably want is a new kind of variable that could be set from a DB
when a page is loaded and the DB updated on save. I really do not want to
do forms.
PTV assignment is simple text parsing, assigning the straightforward text
(which in this case is the expression). All pmwiki "evaluation" of
expressions is done by means of rules, but the rules run on the text of the
current page, not on the value held in the PTV unless the value of the PTV
becomes part of the text of the current page (if that makes sense).
-Peter
[1] Perhaps a certain subset of rules could be identified and then
variables could have their text run through those rules at the moment of
reading them. But it'd be pretty inefficient, I'm afraid...
--
Lars Eighner
http://www.larseighner.com/index.html
8800 N IH35 APT 1191 AUSTIN TX 78753-5266
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