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Variable tweaks
Sometimes we need to use the same tag multiple times, e.g.
<!-- Summertime -->
<txp:evaluate query='<txp:date format="%m" escape="integer" /> >= 6 and <txp:date format="%m" escape="integer" /> <= 8'>
The living is easy!
</txp:evaluate>In this case it is more computationally economic to store the tag’s output in a variable first:
<!-- Summertime -->
<txp:variable name="month" value='<txp:date format="%m" escape="integer" />' />
<txp:evaluate query='<txp:variable name="month" /> >= 6 and <txp:variable name="month" /> <= 8'>
The living is easy!
</txp:evaluate>This is not very readable. What if it could be reduced to something like
<!-- Summertime -->
<txp:date format="%m" escape="integer" variable="month" />
<txp:evaluate query="$month >= 6 and $month <= 8" import="month">
The living is easy!
</txp:evaluate>by introducing a global variable attribute (import to be discussed)?
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Re: Variable tweaks
My instinct says: Holy Yes Cakes!
My only question is over the naming. Does the variable="somevar" attribute actually store the result in the given Txp variable so it can be extracted using <txp:variable name="somevar" /> afterwards? In which case, that’s a brilliant additional feature and a great name for it. It could open up some other handy usages too.
If not, maybe something like export would match the companion import to read it in? Not given the naming much thought beyond that so there might be even better names out there. But I love the direction.
EDIT: also, is $ the best way to access the variable from within other attributes? Could that clash with something? Would a different txpish prefix be more robust?
Last edited by Bloke (2024-04-04 17:28:04)
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Re: Variable tweaks
Thanks!
Bloke wrote #337021:
Does the
variable="somevar"attribute actually store the result in the given Txp variable so it can be extracted using<txp:variable name="somevar" />afterwards?
Yep, that’s the idea.
If not, maybe something like
exportwould match the companionimportto read it in?
This is another possibility, are there any extra benefits in it?
EDIT: also, is
$the best way to access the variable from within other attributes? Could that clash with something? Would a different txpish prefix be more robust?
I’ve actually only thought of query attribute of <txp:evaluate /> tag (and maybe few more). Do you see other attributes susceptible to use variables massively? I mean, blindly replacing patterns in every attribute is expensive..
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Re: Variable tweaks
We surely could find a way to indicate which variables and in which attributes we need to import, like
query: month, year | thing: yearbut it looks a bit overkill.
Anyway, global variable attribute looks handy, so I’ve pushed it to dev (along with $somevar substitutions in evaluate, for testing).
Edit: sorry, it is called alias instead of import in my commit, subject to change.
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Re: Variable tweaks
Not thought the extended ramifications or use cases through. If its main application is queries then that’s fine. Dollars just seem a bit programmery is all.
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Re: Variable tweaks
Alias is fine. Alternatives:
- Use
- Get
- Read
- Grab
- …
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Re: Variable tweaks
… As feedback:
I just noticed an infinite loop within a blank page 😱 on a fairly complex new project I’m working on…
Undoing your last commit restores a very fast TXP CMS (4.9-dev)… (however, I’m loving these latest features you introduced, especially the new <txp:date />).
Last edited by Pat64 (2024-04-05 04:12:07)
Patrick.
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Re: Variable tweaks
Interesting. Are you using variable attribute, per se or as a parameter of some shortcode? Mind posting the relevant code?
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Re: Variable tweaks
Just TXP variables (a lot) and custom fields (a lot, too).
Patrick.
Github | CodePen | Codier | Simplr theme | Wait Me: a maintenance theme | [\a mi.ni.ma]: a “Low Tech” simple Blog theme.
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Re: Variable tweaks
This does not help me much, but please try the latest commit, just in case.
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Re: Variable tweaks
Perhaps related: I had the following at the start of shortcode form that is inserted inside the body (<txp:body />) of an article:
<txp:evaluate query='starts-with( "<txp:page_url/>", "/rss")' escape='trim,textile'>Up till now this worked fine (did not cause any error), but now I get the following error message when viewing an article containing that shortcode:
Tag error: <txp:page_url/> -> Textpattern Warning: page_url/ tag does not existLooking closely, there is a missing space between _url and /. Once added the error goes away.
TXP 4.9-dev latest (testing mode), PHP 8.2
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Re: Variable tweaks
BTW, on the main topic, this will be a valuable addition I think. And alias sound good.
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