AW: [PHPTAL] Re: AW: Logical operators in PHPTAL

[Per Bernhardt]

I want my templates to be as simple as possible.
They should not include any logic at all. So I never use php-modifier and I would also like to avoid some kind of AND or OR logical operators (although there are the smaller problem...).

But a template needs what I call "state". The simplest example for me is the odd-even problem:

<ul>
	<li tal:repeat="item items" class="${what to do here, odd or even?}" />
</ul>

The state of the rendering for the li-tag depends on the current item. So instead of writing php or some complex "a ? B : c" syntax, I just want to have somebody (model) who decides what to do for the current li.

Of course you can write a modifier for this like "css-odd-or-even:repeat/item/odd". But I don't like modifiers the way they are implemented now. That is for two reasons:
1. You have do define something global (function or static method I think?) to let phptal find the modifier. You can't just register modifiers with the phptal-object like you can do it with filters or resolvers for example.
2. Each modifier has to parse it's argument(s) on his own.

What I would like to have is an object, which I can call a method on and pass arguments to.

So I would also say that you should strip the logical operators but implement a way to pass arguments to a method of a variable within the phptal context:

$p = new PHPTAL('template.html');
$p->oddHelper = new OddHelper();
$p->items = array(1, 2, 3);

<ul>
	<li tal:repeat="item items" class="${oddHelper(repeat/item/odd)}" />
</ul>

I think it would be much simpler to extend the current tal-syntax only to allow parameters than to introduce logical operators. And it would keep the syntax simpler.

Kind regards,
Per





-----Ursprüngliche Nachricht-----
Von: phptal-bounces at lists.motion-twin.com [mailto:phptal-bounces at lists.motion-twin.com] Im Auftrag von Ivo Võsa
Gesendet: Montag, 4. Oktober 2010 11:54
An: Template Attribute Language for PHP
Betreff: Re: [PHPTAL] Re: AW: Logical operators in PHPTAL

Kornel Lesiński wrote:
> On 1 Oct 2010, at 18:46, Moritz Baumann wrote:
>
>   
>>> I think the next step would be to work out syntax exactly:
>>>
>>> http://phptal.org/wiki/doku.php/improvedtales
>>>       
>> Hm, that page mentions a lot more than just logical operators. I 
>> guess that’s what the negative feedback was about, not logical operators inside tal:condition.
>>
>> The main difference between PHPTAl and other template engines is that 
>> the syntax is quite simple and that the templates look "clean". IMHO, 
>> function calls and an equivalent to the ?: operator would add 
>> unnecessary complexity to PHPTAL and spoil exactly what makes PHPTAL 
>> unique and great. Support for logical operators inside tal:condition, 
>> on the other hand, would make the php: modifier more or less unnecessary.
>>     
>
>
> I look at this differently: these are things I need, whether their syntax is nice or not, so I'd prefer to make their syntax nicer.
>
> Perhaps arguments to functions is a step too far (and authors should be required to write expression modifiers for these), but setting of class name based on condition is a very common pattern and ternary operator is an awful way to do it.
>
>   
i personaly would like to avoid "php:" as much as possible, so for setting class name i use things like

function phptal_tales_iftrue($src, $nothrow) { $src = explode(',', trim($src)); return '(' . phptal_tales(trim($src[0]), $nothrow) . ' ? ' . 
phptal_tales(trim($src[1]), $nothrow) . ' : null)'; }

<li tal:repeat="item list" class="${iftrue: repeat/item/end, 'last'}">...</li>



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