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Faster template processing


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remy

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Registered: 09/06/03
Posts: 155
Location:Rotterdam & Bonn
cheerful
In the template class, the variables are substituted with a preg_replace, while all values must be manipulated to avoid 'bogus stripping'.
Following example does the same with a preg_replace_callback and speeds up the processing AND is recursive too. There is no need to neither process nor copying of (huge) arrays of vars and values.
Well, that's tested in my case: having many, many vars.

PHP Formatted Code
protected function substitute($var) {
    $regex    = '/\{([-\.\w\d_\[\]]+)\}/';
    $callback = function($matches) { return $this->substitute($matches[1]); };
    $text = $this->get_var($var);
    $text = preg_replace_callback($regex, $callback, $text);
}


There is no step for PHP to translate a lot of regexes, just one callback.
One can avoid the recursion when 'substitute' is replaced by 'get_var'.
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Laugh

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Registered: 27/09/05
Posts: 1403
Always interested in speeding up the template class. Are you able to update the template class with these changes? You could do a pull request on our repository: https://github.com/Geeklog-Core/geeklog
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remy

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Registered: 09/06/03
Posts: 155
Location:Rotterdam & Bonn
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Don't know pull. Cool

The described function is a direct replacement for the function slow_subst.
I'm focussed on recursion, and the caching in template.class is hindering recursion in the logic extension syntax; i.e. if, loop, while. Blocks processing is a headache too.
I'm still experimenting. Confused
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Registered: 27/09/05
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Experiment away. Smile

I use a lot of template variables and logic processing in my templates so any speed increase is excellent.

I will be working on Geeklog code again in September. If you have an updated template class by that point I can test and include it with the main code base, if it all checks out. Just remember we need to support PHP 5.6 (and higher).
One of the Geeklog Core Developers.
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remy

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Registered: 09/06/03
Posts: 155
Location:Rotterdam & Bonn
Finished parts of a new template system. Below a description.

It is definitely faster than the GL native template class, besides it handles some functionality better.
In order to do a benchmark it is discovered meanwhile that the GL template class is tight integrated with GL and cannot be tested stand alone. Unless I'm overlooking a trick?

Anyway, I've broken down the template processing into substituting and parsing (Snippet class), including files and nesting blocks (Templet class), adding logic (Template class), and caching (Stencil class). Current versions are exhibiting my needs, but it would be easy to add backward compatibility. The Stencil class is not yet ready, in the sense that it is not tested enough.

Extra's:
configurable recursion
added inserting global variables
added conditional orphans
added default variable {debugInfo}
added closures

I've posted the package SIREN (Snippet + Templet) in phpclasses.org. Have a look at
https://www.phpclasses.org/package/11637-PHP-Template-engine-featuring-recursion-and-nesting.html
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Interesting. I will have to take a look.
One of the Geeklog Core Developers.
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